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HEXB_HUMAN
ID   HEXB_HUMAN              Reviewed;         556 AA.
AC   P07686;
DT   01-APR-1988, integrated into UniProtKB/Swiss-Prot.
DT   23-FEB-2022, sequence version 4.
DT   03-AUG-2022, entry version 225.
DE   RecName: Full=Beta-hexosaminidase subunit beta {ECO:0000305};
DE            EC=3.2.1.52 {ECO:0000269|PubMed:11707436, ECO:0000269|PubMed:8123671, ECO:0000269|PubMed:8672428, ECO:0000269|PubMed:9694901};
DE   AltName: Full=Beta-N-acetylhexosaminidase subunit beta;
DE            Short=Hexosaminidase subunit B;
DE   AltName: Full=Cervical cancer proto-oncogene 7 protein;
DE            Short=HCC-7;
DE   AltName: Full=N-acetyl-beta-glucosaminidase subunit beta;
DE   Contains:
DE     RecName: Full=Beta-hexosaminidase subunit beta chain B;
DE   Contains:
DE     RecName: Full=Beta-hexosaminidase subunit beta chain A;
DE   Flags: Precursor;
GN   Name=HEXB {ECO:0000312|HGNC:HGNC:4879}; ORFNames=HCC7;
OS   Homo sapiens (Human).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae;
OC   Homo.
OX   NCBI_TaxID=9606;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA], AND VARIANT SER-62.
RX   PubMed=3013851; DOI=10.1016/s0021-9258(19)83927-3;
RA   Korneluk R.G., Mahuran D.J., Neote K., Klavins M.H., O'Dowd B.F.,
RA   Tropak M., Willard H.F., Anderson M.-J., Lowden J.A., Gravel R.A.;
RT   "Isolation of cDNA clones coding for the alpha-subunit of human beta-
RT   hexosaminidase. Extensive homology between the alpha- and beta-subunits and
RT   studies on Tay-Sachs disease.";
RL   J. Biol. Chem. 261:8407-8413(1986).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA], AND VARIANT SER-62.
RX   PubMed=2977375; DOI=10.1016/0888-7543(88)90116-4;
RA   Neote K., Bapat B., Dumbrille-Ross A., Troxel C., Schuster S.M.,
RA   Mahuran D.J., Gravel R.A.;
RT   "Characterization of the human HEXB gene encoding lysosomal beta-
RT   hexosaminidase.";
RL   Genomics 3:279-286(1988).
RN   [3]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA], AND VARIANT SER-62.
RX   PubMed=2964638; DOI=10.1073/pnas.85.6.1883;
RA   Proia R.L.;
RT   "Gene encoding the human beta-hexosaminidase beta chain: extensive homology
RT   of intron placement in the alpha- and beta-chain genes.";
RL   Proc. Natl. Acad. Sci. U.S.A. 85:1883-1887(1988).
RN   [4]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA], AND VARIANT SER-62.
RA   Kim J.W.;
RT   "Identification of a new proto-oncogene in human cancers.";
RL   Submitted (MAY-2001) to the EMBL/GenBank/DDBJ databases.
RN   [5]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA], AND VARIANT SER-62.
RA   Kalnine N., Chen X., Rolfs A., Halleck A., Hines L., Eisenstein S.,
RA   Koundinya M., Raphael J., Moreira D., Kelley T., LaBaer J., Lin Y.,
RA   Phelan M., Farmer A.;
RT   "Cloning of human full-length CDSs in BD Creator(TM) system donor vector.";
RL   Submitted (AUG-2003) to the EMBL/GenBank/DDBJ databases.
RN   [6]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=15372022; DOI=10.1038/nature02919;
RA   Schmutz J., Martin J., Terry A., Couronne O., Grimwood J., Lowry S.,
RA   Gordon L.A., Scott D., Xie G., Huang W., Hellsten U., Tran-Gyamfi M.,
RA   She X., Prabhakar S., Aerts A., Altherr M., Bajorek E., Black S.,
RA   Branscomb E., Caoile C., Challacombe J.F., Chan Y.M., Denys M.,
RA   Detter J.C., Escobar J., Flowers D., Fotopulos D., Glavina T., Gomez M.,
RA   Gonzales E., Goodstein D., Grigoriev I., Groza M., Hammon N., Hawkins T.,
RA   Haydu L., Israni S., Jett J., Kadner K., Kimball H., Kobayashi A.,
RA   Lopez F., Lou Y., Martinez D., Medina C., Morgan J., Nandkeshwar R.,
RA   Noonan J.P., Pitluck S., Pollard M., Predki P., Priest J., Ramirez L.,
RA   Retterer J., Rodriguez A., Rogers S., Salamov A., Salazar A., Thayer N.,
RA   Tice H., Tsai M., Ustaszewska A., Vo N., Wheeler J., Wu K., Yang J.,
RA   Dickson M., Cheng J.-F., Eichler E.E., Olsen A., Pennacchio L.A.,
RA   Rokhsar D.S., Richardson P., Lucas S.M., Myers R.M., Rubin E.M.;
RT   "The DNA sequence and comparative analysis of human chromosome 5.";
RL   Nature 431:268-274(2004).
RN   [7]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA], AND VARIANT SER-62.
RC   TISSUE=Skin;
RX   PubMed=15489334; DOI=10.1101/gr.2596504;
RG   The MGC Project Team;
RT   "The status, quality, and expansion of the NIH full-length cDNA project:
RT   the Mammalian Gene Collection (MGC).";
RL   Genome Res. 14:2121-2127(2004).
RN   [8]
RP   NUCLEOTIDE SEQUENCE [MRNA] OF 1-67, AND VARIANT SER-62.
RX   PubMed=2971039; DOI=10.1016/s0021-9258(18)37728-7;
RA   Sonderfeld-Fresko S., Proia R.L.;
RT   "Synthesis and assembly of a catalytically active lysosomal enzyme, beta-
RT   hexosaminidase B, in a cell-free system.";
RL   J. Biol. Chem. 263:13463-13469(1988).
RN   [9]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 1-52.
RX   PubMed=2147427; DOI=10.1016/s0021-9258(17)45286-0;
RA   Neote K., Brown C.A., Mahuran D.J., Gravel R.A.;
RT   "Translation initiation in the HEXB gene encoding the beta-subunit of human
RT   beta-hexosaminidase.";
RL   J. Biol. Chem. 265:20799-20806(1990).
RN   [10]
RP   PROTEIN SEQUENCE OF 43-57 AND 122-151.
RX   PubMed=2966076; DOI=10.1016/0014-5793(88)80699-9;
RA   Stirling J., Leung A., Gravel R.A., Mahuran D.;
RT   "Localization of the pro-sequence within the total deduced primary
RT   structure of human beta-hexosaminidase B.";
RL   FEBS Lett. 231:47-50(1988).
RN   [11]
RP   PROTEIN SEQUENCE OF 45-54 AND 315-324.
RX   PubMed=2139028; DOI=10.1016/s0021-9258(19)39219-1;
RA   Mahuran D.J.;
RT   "Characterization of human placental beta-hexosaminidase I2. Proteolytic
RT   processing intermediates of hexosaminidase A.";
RL   J. Biol. Chem. 265:6794-6799(1990).
RN   [12]
RP   PROTEIN SEQUENCE OF 50-59.
RX   PubMed=2525487; DOI=10.1016/0014-5793(89)80649-0;
RA   Hubbes M., Callahan J., Gravel R., Mahuran D.;
RT   "The amino-terminal sequences in the pro-alpha and -beta polypeptides of
RT   human lysosomal beta-hexosaminidase A and B are retained in the mature
RT   isozymes.";
RL   FEBS Lett. 249:316-320(1989).
RN   [13]
RP   PROTEIN SEQUENCE OF 122-151 AND 315-340.
RX   PubMed=2965147; DOI=10.1016/s0021-9258(18)68826-x;
RA   Mahuran D.J., Neote K., Klavins M.H., Leung A., Gravel R.A.;
RT   "Proteolytic processing of pro-alpha and pro-beta precursors from human
RT   beta-hexosaminidase. Generation of the mature alpha and beta a beta b
RT   subunits.";
RL   J. Biol. Chem. 263:4612-4618(1988).
RN   [14]
RP   NUCLEOTIDE SEQUENCE [MRNA] OF 226-283.
RX   PubMed=2579389; DOI=10.1073/pnas.82.4.1184;
RA   O'Dowd B.F., Quan F., Willard H.F., Lamhonwah A.-M., Korneluk R.G.,
RA   Lowden J.A., Gravel R.A., Mahuran D.J.;
RT   "Isolation of cDNA clones coding for the beta subunit of human beta-
RT   hexosaminidase.";
RL   Proc. Natl. Acad. Sci. U.S.A. 82:1184-1188(1985).
RN   [15]
RP   STRUCTURE OF CARBOHYDRATES.
RX   PubMed=2971395; DOI=10.1021/bi00414a041;
RA   O'Dowd B.F., Cumming D.A., Gravel R.A., Mahuran D.J.;
RT   "Oligosaccharide structure and amino acid sequence of the major
RT   glycopeptides of mature human beta-hexosaminidase.";
RL   Biochemistry 27:5216-5226(1988).
RN   [16]
RP   CATALYTIC ACTIVITY, AND FUNCTION.
RX   PubMed=8123671; DOI=10.1016/0304-4165(94)90118-x;
RA   Novak A., Callahan J.W., Lowden J.A.;
RT   "Classification of disorders of GM2 ganglioside hydrolysis using 3H-GM2 as
RT   substrate.";
RL   Biochim. Biophys. Acta 1199:215-223(1994).
RN   [17]
RP   MUTAGENESIS OF ARG-211, FUNCTION, CATALYTIC ACTIVITY, AND SUBUNIT.
RX   PubMed=8672428; DOI=10.1021/bi9524575;
RA   Hou Y., Tse R., Mahuran D.J.;
RT   "Direct determination of the substrate specificity of the alpha-active site
RT   in heterodimeric beta-hexosaminidase A.";
RL   Biochemistry 35:3963-3969(1996).
RN   [18]
RP   GLYCOSYLATION AT ASN-327.
RX   PubMed=12754519; DOI=10.1038/nbt827;
RA   Zhang H., Li X.-J., Martin D.B., Aebersold R.;
RT   "Identification and quantification of N-linked glycoproteins using
RT   hydrazide chemistry, stable isotope labeling and mass spectrometry.";
RL   Nat. Biotechnol. 21:660-666(2003).
RN   [19]
RP   DISULFIDE BONDS, AND GLYCOSYLATION AT ASN-84; ASN-142; ASN-190 AND ASN-327.
RX   PubMed=11447134; DOI=10.1093/glycob/11.7.549;
RA   Schuette C.G., Weisgerber J., Sandhoff K.;
RT   "Complete analysis of the glycosylation and disulfide bond pattern of human
RT   beta-hexosaminidase B by MALDI-MS.";
RL   Glycobiology 11:549-556(2001).
RN   [20]
RP   FUNCTION, CATALYTIC ACTIVITY, AND ACTIVITY REGULATION.
RX   PubMed=11707436; DOI=10.1074/jbc.m105457200;
RA   Hepbildikler S.T., Sandhoff R., Kolzer M., Proia R.L., Sandhoff K.;
RT   "Physiological substrates for human lysosomal beta -hexosaminidase S.";
RL   J. Biol. Chem. 277:2562-2572(2002).
RN   [21]
RP   GLYCOSYLATION [LARGE SCALE ANALYSIS] AT ASN-84 AND ASN-327.
RC   TISSUE=Liver;
RX   PubMed=19159218; DOI=10.1021/pr8008012;
RA   Chen R., Jiang X., Sun D., Han G., Wang F., Ye M., Wang L., Zou H.;
RT   "Glycoproteomics analysis of human liver tissue by combination of multiple
RT   enzyme digestion and hydrazide chemistry.";
RL   J. Proteome Res. 8:651-661(2009).
RN   [22]
RP   IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS].
RX   PubMed=21269460; DOI=10.1186/1752-0509-5-17;
RA   Burkard T.R., Planyavsky M., Kaupe I., Breitwieser F.P., Buerckstuemmer T.,
RA   Bennett K.L., Superti-Furga G., Colinge J.;
RT   "Initial characterization of the human central proteome.";
RL   BMC Syst. Biol. 5:17-17(2011).
RN   [23]
RP   IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS].
RC   TISSUE=Liver;
RX   PubMed=24275569; DOI=10.1016/j.jprot.2013.11.014;
RA   Bian Y., Song C., Cheng K., Dong M., Wang F., Huang J., Sun D., Wang L.,
RA   Ye M., Zou H.;
RT   "An enzyme assisted RP-RPLC approach for in-depth analysis of human liver
RT   phosphoproteome.";
RL   J. Proteomics 96:253-262(2014).
RN   [24]
RP   IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS].
RX   PubMed=25944712; DOI=10.1002/pmic.201400617;
RA   Vaca Jacome A.S., Rabilloud T., Schaeffer-Reiss C., Rompais M., Ayoub D.,
RA   Lane L., Bairoch A., Van Dorsselaer A., Carapito C.;
RT   "N-terminome analysis of the human mitochondrial proteome.";
RL   Proteomics 15:2519-2524(2015).
RN   [25]
RP   3D-STRUCTURE MODELING.
RX   PubMed=8673609; DOI=10.1038/nsb0796-638;
RA   Tews I., Perrakis A., Oppenheim A., Dauter Z., Wilson K.S., Vorgias C.E.;
RT   "Bacterial chitobiase structure provides insight into catalytic mechanism
RT   and the basis of Tay-Sachs disease.";
RL   Nat. Struct. Biol. 3:638-648(1996).
RN   [26]
RP   X-RAY CRYSTALLOGRAPHY (2.4 ANGSTROMS) OF 50-556, AND DISULFIDE BONDS.
RX   PubMed=12662933; DOI=10.1016/s0022-2836(03)00216-x;
RA   Mark B.L., Mahuran D.J., Cherney M.M., Zhao D., Knapp S., James M.N.;
RT   "Crystal structure of human beta-hexosaminidase B: understanding the
RT   molecular basis of Sandhoff and Tay-Sachs disease.";
RL   J. Mol. Biol. 327:1093-1109(2003).
RN   [27]
RP   X-RAY CRYSTALLOGRAPHY (2.25 ANGSTROMS) OF 42-556, AND DISULFIDE BONDS.
RX   PubMed=12706724; DOI=10.1016/s0022-2836(03)00311-5;
RA   Maier T., Strater N., Schuette C.G., Klingenstein R., Sandhoff K.,
RA   Saenger W.;
RT   "The X-ray crystal structure of human beta-hexosaminidase B provides new
RT   insights into Sandhoff disease.";
RL   J. Mol. Biol. 328:669-681(2003).
RN   [28]
RP   REVIEW ON VARIANTS.
RX   PubMed=1825792; DOI=10.1016/0925-4439(91)90044-a;
RA   Mahuran D.J.;
RT   "The biochemistry of HEXA and HEXB gene mutations causing GM2
RT   gangliosidosis.";
RL   Biochim. Biophys. Acta 1096:87-94(1991).
RN   [29]
RP   VARIANT GM2G2 SER-456, AND VARIANT VAL-207.
RX   PubMed=1720305; DOI=10.1016/s0006-291x(05)81388-9;
RA   Banerjee P., Siciliano L., Oliveri D., McCabe N.R., Boyers M.J.,
RA   Horwitz A.L., Li S.-C., Dawson G.;
RT   "Molecular basis of an adult form of beta-hexosaminidase B deficiency with
RT   motor neuron disease.";
RL   Biochem. Biophys. Res. Commun. 181:108-115(1991).
RN   [30]
RP   VARIANT GM2G2 LEU-417.
RX   PubMed=1531140; DOI=10.1016/s0021-9258(18)45894-2;
RA   Wakamatsu N., Kobayashi H., Miyatake T., Tsuji S.;
RT   "A novel exon mutation in the human beta-hexosaminidase beta subunit gene
RT   affects 3' splice site selection.";
RL   J. Biol. Chem. 267:2406-2413(1992).
RN   [31]
RP   VARIANT GM2G2 GLN-505.
RX   PubMed=8357844; DOI=10.1016/0925-4439(93)90134-m;
RA   Bolhuis P.A., Ponne N.J., Bikker H., Baas F., Vianney de Jong J.M.B.;
RT   "Molecular basis of an adult form of Sandhoff disease: substitution of
RT   glutamine for arginine at position 505 of the beta-chain of beta-
RT   hexosaminidase results in a labile enzyme.";
RL   Biochim. Biophys. Acta 1182:142-146(1993).
RN   [32]
RP   VARIANT GM2G2 TYR-534.
RX   PubMed=7626071; DOI=10.1006/bbrc.1995.2007;
RA   Kuroki Y., Itoh K., Nadaoka Y., Tanaka T., Sakuraba H.;
RT   "A novel missense mutation (C522Y) is present in the beta-hexosaminidase
RT   beta-subunit gene of a Japanese patient with infantile Sandhoff disease.";
RL   Biochem. Biophys. Res. Commun. 212:564-571(1995).
RN   [33]
RP   VARIANTS GM2G2 TYR-309 AND LEU-417.
RX   PubMed=7557963; DOI=10.1007/bf00191799;
RA   Gomez-Lira M., Sangalli A., Mottes M., Perusi C., Pignatti P.F.,
RA   Rizzuto N., Salviati A.;
RT   "A common beta hexosaminidase gene mutation in adult Sandhoff disease
RT   patients.";
RL   Hum. Genet. 96:417-422(1995).
RN   [34]
RP   INVOLVEMENT IN GM2G2, AND VARIANT SER-62.
RX   PubMed=7633435; DOI=10.1093/hmg/4.4.777;
RA   Zhang Z.-X., Wakamatsu N., Akerman B.R., Mules E.H., Thomas G.H.,
RA   Gravel R.A.;
RT   "A second, large deletion in the HEXB gene in a patient with infantile
RT   Sandhoff disease.";
RL   Hum. Mol. Genet. 4:777-780(1995).
RN   [35]
RP   VARIANT GM2G2 GLN-505, AND VARIANT VAL-207.
RX   PubMed=8950198; DOI=10.1016/s0925-4439(96)00044-0;
RA   Redonnet-Vernhet I., Mahuran D.J., Salvayre R., Dubas F., Levade T.;
RT   "Significance of two point mutations present in each HEXB allele of
RT   patients with adult GM2 gangliosidosis (Sandhoff disease) homozygosity for
RT   the Ile207-->Val substitution is not associated with a clinical or
RT   biochemical phenotype.";
RL   Biochim. Biophys. Acta 1317:127-133(1996).
RN   [36]
RP   VARIANT GM2G2 THR-543.
RX   PubMed=9401004;
RX   DOI=10.1002/(sici)1098-1004(1997)10:6<424::aid-humu2>3.0.co;2-d;
RA   Narkis G., Adam A., Jaber L., Pennybacker M., Proia R.L., Navon R.;
RT   "Molecular basis of heat labile hexosaminidase B among Jews and Arabs.";
RL   Hum. Mutat. 10:424-429(1997).
RN   [37]
RP   VARIANT GM2G2 ARG-255.
RX   PubMed=9856491; DOI=10.1007/s004390050851;
RA   Fujimaru M., Tanaka A., Choeh K., Wakamatsu N., Sakuraba H., Isshiki G.;
RT   "Two mutations remote from an exon/intron junction in the beta-
RT   hexosaminidase beta-subunit gene affect 3'-splice site selection and cause
RT   Sandhoff disease.";
RL   Hum. Genet. 103:462-469(1998).
RN   [38]
RP   VARIANT GM2G2 SER-504, CATALYTIC ACTIVITY, FUNCTION, CHARACTERIZATION OF
RP   VARIANT GM2G2 SER-504, AND SUBCELLULAR LOCATION.
RX   PubMed=9694901; DOI=10.1074/jbc.273.33.21386;
RA   Hou Y., McInnes B., Hinek A., Karpati G., Mahuran D.;
RT   "A Pro504 --> Ser substitution in the beta-subunit of beta-hexosaminidase A
RT   inhibits alpha-subunit hydrolysis of GM2 ganglioside, resulting in chronic
RT   Sandhoff disease.";
RL   J. Biol. Chem. 273:21386-21392(1998).
CC   -!- FUNCTION: Hydrolyzes the non-reducing end N-acetyl-D-hexosamine and/or
CC       sulfated N-acetyl-D-hexosamine of glycoconjugates, such as the
CC       oligosaccharide moieties from proteins and neutral glycolipids, or from
CC       certain mucopolysaccharides (PubMed:11707436, PubMed:9694901,
CC       PubMed:8672428, PubMed:8123671). The isozyme B does not hydrolyze each
CC       of these substrates, however hydrolyzes efficiently neutral
CC       oligosaccharide (PubMed:11707436). Only the isozyme A is responsible
CC       for the degradation of GM2 gangliosides in the presence of GM2A
CC       (PubMed:9694901, PubMed:8672428, PubMed:8123671). During fertilization
CC       is responsible, at least in part, for the zona block to polyspermy.
CC       Present in the cortical granules of non-activated oocytes, is
CC       exocytosed during the cortical reaction in response to oocyte
CC       activation and inactivates the sperm galactosyltransferase-binding
CC       site, accounting for the block in sperm binding to the zona pellucida
CC       (By similarity). {ECO:0000250|UniProtKB:P20060,
CC       ECO:0000269|PubMed:11707436, ECO:0000269|PubMed:8123671,
CC       ECO:0000269|PubMed:8672428, ECO:0000269|PubMed:9694901}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Hydrolysis of terminal non-reducing N-acetyl-D-hexosamine
CC         residues in N-acetyl-beta-D-hexosaminides.; EC=3.2.1.52;
CC         Evidence={ECO:0000269|PubMed:11707436, ECO:0000269|PubMed:8123671,
CC         ECO:0000269|PubMed:8672428, ECO:0000269|PubMed:9694901};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=H2O + N-acetyl-beta-D-galactosaminyl-(1->4)-beta-D-3-
CC         sulfogalactosyl-(1->4)-beta-D-glucosyl-(1<->1')-ceramide = a beta-D-
CC         3-sulfogalactosyl-(1->4)-beta-D-glucosyl-(1<->1')-ceramide + N-
CC         acetyl-beta-D-galactosamine; Xref=Rhea:RHEA:48276, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:28497, ChEBI:CHEBI:90163, ChEBI:CHEBI:90164;
CC         Evidence={ECO:0000269|PubMed:11707436};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:48277;
CC         Evidence={ECO:0000305|PubMed:11707436};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=ganglioside GM2 (d18:1(4E)) + H2O = ganglioside GM3
CC         (d18:1(4E)) + N-acetyl-beta-D-galactosamine; Xref=Rhea:RHEA:47940,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:28497, ChEBI:CHEBI:60065,
CC         ChEBI:CHEBI:71502; Evidence={ECO:0000269|PubMed:8123671,
CC         ECO:0000269|PubMed:8672428, ECO:0000269|PubMed:9694901};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:47941;
CC         Evidence={ECO:0000305|PubMed:9694901};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=ganglioside GM2 + H2O = ganglioside GM3 + N-acetyl-beta-D-
CC         galactosamine; Xref=Rhea:RHEA:47968, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:28497, ChEBI:CHEBI:79210, ChEBI:CHEBI:79218;
CC         Evidence={ECO:0000269|PubMed:8123671, ECO:0000269|PubMed:8672428,
CC         ECO:0000269|PubMed:9694901};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:47969;
CC         Evidence={ECO:0000305|PubMed:9694901};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=beta-D-GalNAc-(1->4)-alpha-L-IdoA-(1->3)-beta-D-GalNAc-4-
CC         sulfate-(1->4)-alpha-L-IdoA-(1->3)-D-GalNAc-4-sulfate + H2O = alpha-
CC         L-IdoA-(1->3)-beta-D-GalNAc-4-sulfate-(1->4)-alpha-L-IdoA-(1->3)-D-
CC         GalNAc-4-sulfate + N-acetyl-D-galactosamine; Xref=Rhea:RHEA:64372,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:28037, ChEBI:CHEBI:152565,
CC         ChEBI:CHEBI:152566; Evidence={ECO:0000269|PubMed:11707436};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:64373;
CC         Evidence={ECO:0000305|PubMed:11707436};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=H2O + N-acetyl-beta-D-6-sulfogalactosaminyl-(1->4)-alpha-L-
CC         iduronyl-(1->3)-N-acetyl-D-6-sulfogalactosamine = alpha-L-iduronyl-
CC         (1->3)-N-acetyl-D-6-sulfogalactosamine + N-acetyl-D-6-
CC         sulfogalactosamine; Xref=Rhea:RHEA:64384, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:152567, ChEBI:CHEBI:152568, ChEBI:CHEBI:153064;
CC         Evidence={ECO:0000269|PubMed:11707436};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:64385;
CC         Evidence={ECO:0000305|PubMed:11707436};
CC   -!- ACTIVITY REGULATION: Addition of GM2A stimulates the hydrolysis of
CC       sulfated glycosphingolipid SM2 and the ganglioside GM2.
CC       {ECO:0000269|PubMed:11707436}.
CC   -!- SUBUNIT: There are 3 forms of beta-hexosaminidase: hexosaminidase A is
CC       an heterodimer composed of one subunit alpha and one subunit beta
CC       (chain A and B); hexosaminidase B is an homodimer of two beta subunits
CC       (two chains A and B); hexosaminidase S is a homodimer of two alpha
CC       subunits (By similarity). The composition of the dimer (isozyme A
CC       versus isozyme S) has a significant effect on the substrate specificity
CC       of the alpha subunit active site (PubMed:8672428).
CC       {ECO:0000250|UniProtKB:P06865, ECO:0000269|PubMed:8672428}.
CC   -!- INTERACTION:
CC       P07686; Q9Y575-3: ASB3; NbExp=3; IntAct=EBI-7133736, EBI-14199987;
CC       P07686; O75808: CAPN15; NbExp=3; IntAct=EBI-7133736, EBI-6149008;
CC       P07686; Q9UNS2: COPS3; NbExp=3; IntAct=EBI-7133736, EBI-350590;
CC       P07686; Q96KR6: FAM210B; NbExp=3; IntAct=EBI-7133736, EBI-18938272;
CC       P07686; P06865: HEXA; NbExp=3; IntAct=EBI-7133736, EBI-723519;
CC       P07686; P49639: HOXA1; NbExp=3; IntAct=EBI-7133736, EBI-740785;
CC       P07686; Q8N4N3: KLHL36; NbExp=3; IntAct=EBI-7133736, EBI-6426427;
CC       P07686; Q8TBB1: LNX1; NbExp=3; IntAct=EBI-7133736, EBI-739832;
CC       P07686; Q13064: MKRN3; NbExp=3; IntAct=EBI-7133736, EBI-2340269;
CC       P07686; Q13564: NAE1; NbExp=3; IntAct=EBI-7133736, EBI-718631;
CC       P07686; Q8NFH3: NUP43; NbExp=3; IntAct=EBI-7133736, EBI-1059321;
CC       P07686; Q9GZY0: NXF2; NbExp=3; IntAct=EBI-7133736, EBI-444173;
CC       P07686; Q96FW1: OTUB1; NbExp=3; IntAct=EBI-7133736, EBI-1058491;
CC       P07686; O75925: PIAS1; NbExp=3; IntAct=EBI-7133736, EBI-629434;
CC       P07686; Q96PM5-4: RCHY1; NbExp=3; IntAct=EBI-7133736, EBI-21252376;
CC       P07686; Q96D59: RNF183; NbExp=3; IntAct=EBI-7133736, EBI-743938;
CC       P07686; Q6NW29: RWDD4; NbExp=3; IntAct=EBI-7133736, EBI-743971;
CC       P07686; Q04724: TLE1; NbExp=3; IntAct=EBI-7133736, EBI-711424;
CC       P07686; Q9NUH8: TMEM14B; NbExp=3; IntAct=EBI-7133736, EBI-8638294;
CC       P07686; Q7KZS0: UBE2I; NbExp=3; IntAct=EBI-7133736, EBI-10180829;
CC       P07686; O95164: UBL3; NbExp=3; IntAct=EBI-7133736, EBI-12876508;
CC       P07686; Q9UHD9: UBQLN2; NbExp=3; IntAct=EBI-7133736, EBI-947187;
CC       P07686; Q9H347: UBQLN3; NbExp=3; IntAct=EBI-7133736, EBI-25832660;
CC       P07686; Q8IYU4: UBQLNL; NbExp=3; IntAct=EBI-7133736, EBI-12295223;
CC       P07686; Q8IWV7: UBR1; NbExp=3; IntAct=EBI-7133736, EBI-711736;
CC       P07686; O00308: WWP2; NbExp=3; IntAct=EBI-7133736, EBI-743923;
CC       P07686; P98170: XIAP; NbExp=3; IntAct=EBI-7133736, EBI-517127;
CC       P07686; Q05516: ZBTB16; NbExp=3; IntAct=EBI-7133736, EBI-711925;
CC   -!- SUBCELLULAR LOCATION: Lysosome {ECO:0000269|PubMed:9694901}.
CC       Cytoplasmic vesicle, secretory vesicle, Cortical granule
CC       {ECO:0000250|UniProtKB:P20060}.
CC   -!- PTM: N-linked glycans at Asn-142 and Asn-190 consist of Man(3)-
CC       GlcNAc(2) and Man(5 to 7)-GlcNAc(2), respectively.
CC       {ECO:0000269|PubMed:11447134, ECO:0000269|PubMed:12754519,
CC       ECO:0000269|PubMed:19159218}.
CC   -!- PTM: The beta-A and beta-B chains are produced by proteolytic
CC       processing of the precursor beta chain.
CC   -!- DISEASE: GM2-gangliosidosis 2 (GM2G2) [MIM:268800]: An autosomal
CC       recessive lysosomal storage disease marked by the accumulation of GM2
CC       gangliosides in the neuronal cells. Clinically indistinguishable from
CC       GM2-gangliosidosis type 1, presenting startle reactions, early
CC       blindness, progressive motor and mental deterioration, macrocephaly and
CC       cherry-red spots on the macula. {ECO:0000269|PubMed:1531140,
CC       ECO:0000269|PubMed:1720305, ECO:0000269|PubMed:7557963,
CC       ECO:0000269|PubMed:7626071, ECO:0000269|PubMed:7633435,
CC       ECO:0000269|PubMed:8357844, ECO:0000269|PubMed:8950198,
CC       ECO:0000269|PubMed:9401004, ECO:0000269|PubMed:9694901,
CC       ECO:0000269|PubMed:9856491}. Note=The disease is caused by variants
CC       affecting the gene represented in this entry.
CC   -!- SIMILARITY: Belongs to the glycosyl hydrolase 20 family. {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAA51828.1; Type=Frameshift; Evidence={ECO:0000305};
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DR   EMBL; M13519; AAA51828.1; ALT_FRAME; mRNA.
DR   EMBL; M23294; AAA52645.1; -; Genomic_DNA.
DR   EMBL; M23282; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M23283; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M23284; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M23285; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M23286; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M23287; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M23288; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M23290; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M23291; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M23292; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M23293; AAA52645.1; JOINED; Genomic_DNA.
DR   EMBL; M19735; AAA68620.1; -; mRNA.
DR   EMBL; AF378118; AAM46114.1; -; mRNA.
DR   EMBL; BT009919; AAP88921.1; -; mRNA.
DR   EMBL; AC026405; -; NOT_ANNOTATED_CDS; Genomic_DNA.
DR   EMBL; AC093214; -; NOT_ANNOTATED_CDS; Genomic_DNA.
DR   EMBL; BC017378; AAH17378.1; -; mRNA.
DR   EMBL; M34906; AAA51829.1; -; mRNA.
DR   CCDS; CCDS4022.1; -.
DR   PIR; A31250; A31250.
DR   RefSeq; NP_000512.1; NM_000521.3.
DR   RefSeq; NP_001278933.1; NM_001292004.1.
DR   PDB; 1NOU; X-ray; 2.40 A; A/B=50-556.
DR   PDB; 1NOW; X-ray; 2.20 A; A/B=50-556.
DR   PDB; 1NP0; X-ray; 2.50 A; A/B=50-556.
DR   PDB; 1O7A; X-ray; 2.25 A; A/B/C/D/E/F=42-556.
DR   PDB; 2GJX; X-ray; 2.80 A; B/C/F/G=50-556.
DR   PDB; 2GK1; X-ray; 3.25 A; B/D/F/H=50-552.
DR   PDB; 3LMY; X-ray; 2.80 A; A/B=1-556.
DR   PDB; 5BRO; X-ray; 2.40 A; A=43-556.
DR   PDBsum; 1NOU; -.
DR   PDBsum; 1NOW; -.
DR   PDBsum; 1NP0; -.
DR   PDBsum; 1O7A; -.
DR   PDBsum; 2GJX; -.
DR   PDBsum; 2GK1; -.
DR   PDBsum; 3LMY; -.
DR   PDBsum; 5BRO; -.
DR   AlphaFoldDB; P07686; -.
DR   BioGRID; 109323; 47.
DR   ComplexPortal; CPX-502; Beta-hexosaminidase A complex.
DR   ComplexPortal; CPX-686; Beta-hexosaminidase B complex.
DR   CORUM; P07686; -.
DR   ELM; P07686; -.
DR   IntAct; P07686; 37.
DR   MINT; P07686; -.
DR   STRING; 9606.ENSP00000261416; -.
DR   BindingDB; P07686; -.
DR   ChEMBL; CHEMBL5877; -.
DR   DrugBank; DB03861; (2R,3R,4S,5R)-2-acetamido-3,4-dihydroxy-5-hydroxymethyl-piperidine.
DR   DrugBank; DB02813; 2-Acetamido-2-Deoxy-D-Glucono-1,5-Lactone.
DR   DrugBank; DB09301; Chondroitin sulfate.
DR   DrugBank; DB03747; N-Acetyl-glucosamine thiazoline.
DR   DrugBank; DB00205; Pyrimethamine.
DR   DrugCentral; P07686; -.
DR   CAZy; GH20; Glycoside Hydrolase Family 20.
DR   GlyConnect; 1039; 4 N-Linked glycans (3 sites).
DR   GlyGen; P07686; 7 sites, 13 N-linked glycans (4 sites), 1 O-linked glycan (1 site).
DR   iPTMnet; P07686; -.
DR   MetOSite; P07686; -.
DR   PhosphoSitePlus; P07686; -.
DR   SwissPalm; P07686; -.
DR   BioMuta; HEXB; -.
DR   DMDM; 123081; -.
DR   UCD-2DPAGE; P07686; -.
DR   CPTAC; CPTAC-78; -.
DR   CPTAC; CPTAC-79; -.
DR   EPD; P07686; -.
DR   jPOST; P07686; -.
DR   MassIVE; P07686; -.
DR   MaxQB; P07686; -.
DR   PaxDb; P07686; -.
DR   PeptideAtlas; P07686; -.
DR   PRIDE; P07686; -.
DR   ProteomicsDB; 52022; -.
DR   TopDownProteomics; P07686; -.
DR   Antibodypedia; 24338; 269 antibodies from 34 providers.
DR   DNASU; 3074; -.
DR   Ensembl; ENST00000261416.12; ENSP00000261416.7; ENSG00000049860.14.
DR   GeneID; 3074; -.
DR   KEGG; hsa:3074; -.
DR   MANE-Select; ENST00000261416.12; ENSP00000261416.7; NM_000521.4; NP_000512.2.
DR   UCSC; uc003kdf.4; human.
DR   CTD; 3074; -.
DR   DisGeNET; 3074; -.
DR   GeneCards; HEXB; -.
DR   GeneReviews; HEXB; -.
DR   HGNC; HGNC:4879; HEXB.
DR   HPA; ENSG00000049860; Low tissue specificity.
DR   MalaCards; HEXB; -.
DR   MIM; 268800; phenotype.
DR   MIM; 606873; gene.
DR   neXtProt; NX_P07686; -.
DR   OpenTargets; ENSG00000049860; -.
DR   Orphanet; 309169; Sandhoff disease, adult form.
DR   Orphanet; 309155; Sandhoff disease, infantile form.
DR   Orphanet; 309162; Sandhoff disease, juvenile form.
DR   PharmGKB; PA29257; -.
DR   VEuPathDB; HostDB:ENSG00000049860; -.
DR   eggNOG; KOG2499; Eukaryota.
DR   GeneTree; ENSGT00390000008107; -.
DR   HOGENOM; CLU_007082_0_3_1; -.
DR   InParanoid; P07686; -.
DR   OrthoDB; 545162at2759; -.
DR   PhylomeDB; P07686; -.
DR   TreeFam; TF313036; -.
DR   BioCyc; MetaCyc:HS00629-MON; -.
DR   BRENDA; 3.2.1.52; 2681.
DR   PathwayCommons; P07686; -.
DR   Reactome; R-HSA-1660662; Glycosphingolipid metabolism.
DR   Reactome; R-HSA-2022857; Keratan sulfate degradation.
DR   Reactome; R-HSA-2024101; CS/DS degradation.
DR   Reactome; R-HSA-2160916; Hyaluronan uptake and degradation.
DR   Reactome; R-HSA-3656248; Defective HEXB causes GM2G2.
DR   Reactome; R-HSA-6798695; Neutrophil degranulation.
DR   SABIO-RK; P07686; -.
DR   SignaLink; P07686; -.
DR   BioGRID-ORCS; 3074; 14 hits in 1080 CRISPR screens.
DR   ChiTaRS; HEXB; human.
DR   EvolutionaryTrace; P07686; -.
DR   GeneWiki; HEXB; -.
DR   GenomeRNAi; 3074; -.
DR   Pharos; P07686; Tchem.
DR   PRO; PR:P07686; -.
DR   Proteomes; UP000005640; Chromosome 5.
DR   RNAct; P07686; protein.
DR   Bgee; ENSG00000049860; Expressed in placenta and 196 other tissues.
DR   ExpressionAtlas; P07686; baseline and differential.
DR   Genevisible; P07686; HS.
DR   GO; GO:0001669; C:acrosomal vesicle; IEA:Ensembl.
DR   GO; GO:0042582; C:azurophil granule; IDA:UniProtKB.
DR   GO; GO:0035578; C:azurophil granule lumen; TAS:Reactome.
DR   GO; GO:1905379; C:beta-N-acetylhexosaminidase complex; IPI:ComplexPortal.
DR   GO; GO:0060473; C:cortical granule; ISS:UniProtKB.
DR   GO; GO:0070062; C:extracellular exosome; HDA:UniProtKB.
DR   GO; GO:0005576; C:extracellular region; TAS:Reactome.
DR   GO; GO:0043202; C:lysosomal lumen; TAS:Reactome.
DR   GO; GO:0005764; C:lysosome; IBA:GO_Central.
DR   GO; GO:0016020; C:membrane; HDA:UniProtKB.
DR   GO; GO:0008375; F:acetylglucosaminyltransferase activity; IDA:UniProtKB.
DR   GO; GO:0004563; F:beta-N-acetylhexosaminidase activity; IDA:UniProtKB.
DR   GO; GO:0042802; F:identical protein binding; IDA:MGI.
DR   GO; GO:0102148; F:N-acetyl-beta-D-galactosaminidase activity; IEA:UniProtKB-EC.
DR   GO; GO:0043615; P:astrocyte cell migration; IEA:Ensembl.
DR   GO; GO:0006874; P:cellular calcium ion homeostasis; IEA:Ensembl.
DR   GO; GO:0006689; P:ganglioside catabolic process; IDA:UniProtKB.
DR   GO; GO:0030203; P:glycosaminoglycan metabolic process; IDA:ComplexPortal.
DR   GO; GO:0019915; P:lipid storage; IEA:Ensembl.
DR   GO; GO:0007626; P:locomotory behavior; IEA:Ensembl.
DR   GO; GO:0007040; P:lysosome organization; IEA:Ensembl.
DR   GO; GO:0051651; P:maintenance of location in cell; IEA:Ensembl.
DR   GO; GO:0008049; P:male courtship behavior; IEA:Ensembl.
DR   GO; GO:0042552; P:myelination; IEA:Ensembl.
DR   GO; GO:0050885; P:neuromuscular process controlling balance; IEA:Ensembl.
DR   GO; GO:0070050; P:neuron cellular homeostasis; IEA:Ensembl.
DR   GO; GO:0009313; P:oligosaccharide catabolic process; IEA:Ensembl.
DR   GO; GO:0048477; P:oogenesis; IEA:Ensembl.
DR   GO; GO:0007341; P:penetration of zona pellucida; IEA:Ensembl.
DR   GO; GO:0008654; P:phospholipid biosynthetic process; IEA:Ensembl.
DR   GO; GO:0045944; P:positive regulation of transcription by RNA polymerase II; IEA:Ensembl.
DR   GO; GO:0019538; P:protein metabolic process; IEA:Ensembl.
DR   GO; GO:0008360; P:regulation of cell shape; IEA:Ensembl.
DR   GO; GO:0007605; P:sensory perception of sound; IEA:Ensembl.
DR   GO; GO:0007338; P:single fertilization; ISS:UniProtKB.
DR   GO; GO:0001501; P:skeletal system development; IEA:Ensembl.
DR   Gene3D; 3.30.379.10; -; 1.
DR   InterPro; IPR025705; Beta_hexosaminidase_sua/sub.
DR   InterPro; IPR015883; Glyco_hydro_20_cat.
DR   InterPro; IPR017853; Glycoside_hydrolase_SF.
DR   InterPro; IPR029018; Hex-like_dom2.
DR   InterPro; IPR029019; HEX_eukaryotic_N.
DR   PANTHER; PTHR22600; PTHR22600; 1.
DR   Pfam; PF00728; Glyco_hydro_20; 1.
DR   Pfam; PF14845; Glycohydro_20b2; 1.
DR   PIRSF; PIRSF001093; B-hxosamndse_ab_euk; 1.
DR   PRINTS; PR00738; GLHYDRLASE20.
DR   SUPFAM; SSF51445; SSF51445; 1.
DR   SUPFAM; SSF55545; SSF55545; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Cytoplasmic vesicle; Direct protein sequencing;
KW   Disease variant; Disulfide bond; Gangliosidosis; Glycoprotein; Glycosidase;
KW   Hydrolase; Lipid metabolism; Lysosome; Neurodegeneration;
KW   Reference proteome; Signal; Zymogen.
FT   SIGNAL          1..42
FT                   /evidence="ECO:0000255"
FT   PROPEP          43..121
FT                   /evidence="ECO:0000269|PubMed:2965147,
FT                   ECO:0000269|PubMed:2966076"
FT                   /id="PRO_0000012002"
FT   CHAIN           122..556
FT                   /note="Beta-hexosaminidase subunit beta"
FT                   /id="PRO_0000012003"
FT   CHAIN           122..311
FT                   /note="Beta-hexosaminidase subunit beta chain B"
FT                   /id="PRO_0000012004"
FT   CHAIN           315..556
FT                   /note="Beta-hexosaminidase subunit beta chain A"
FT                   /id="PRO_0000012005"
FT   ACT_SITE        355
FT                   /note="Proton donor"
FT                   /evidence="ECO:0000250"
FT   SITE            497
FT                   /note="Not glycosylated"
FT                   /evidence="ECO:0000269|PubMed:11447134"
FT   CARBOHYD        84
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000269|PubMed:11447134,
FT                   ECO:0000269|PubMed:19159218"
FT   CARBOHYD        142
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000269|PubMed:11447134"
FT   CARBOHYD        190
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000269|PubMed:11447134"
FT   CARBOHYD        327
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000269|PubMed:11447134,
FT                   ECO:0000269|PubMed:12754519, ECO:0000269|PubMed:19159218"
FT   DISULFID        91..137
FT   DISULFID        309..360
FT   DISULFID        534..551
FT   VARIANT         62
FT                   /note="L -> S (in GM2G2; dbSNP:rs820878)"
FT                   /evidence="ECO:0000269|PubMed:15489334,
FT                   ECO:0000269|PubMed:2964638, ECO:0000269|PubMed:2971039,
FT                   ECO:0000269|PubMed:2977375, ECO:0000269|PubMed:3013851,
FT                   ECO:0000269|PubMed:7633435, ECO:0000269|Ref.4,
FT                   ECO:0000269|Ref.5"
FT                   /id="VAR_003247"
FT   VARIANT         121
FT                   /note="K -> R (in dbSNP:rs11556045)"
FT                   /id="VAR_003248"
FT   VARIANT         207
FT                   /note="I -> V (in dbSNP:rs10805890)"
FT                   /evidence="ECO:0000269|PubMed:1720305,
FT                   ECO:0000269|PubMed:8950198"
FT                   /id="VAR_003249"
FT   VARIANT         255
FT                   /note="S -> R (in GM2G2; dbSNP:rs1554035829)"
FT                   /evidence="ECO:0000269|PubMed:9856491"
FT                   /id="VAR_011704"
FT   VARIANT         309
FT                   /note="C -> Y (in GM2G2; adult type; severe;
FT                   dbSNP:rs1554036641)"
FT                   /evidence="ECO:0000269|PubMed:7557963"
FT                   /id="VAR_003250"
FT   VARIANT         417
FT                   /note="P -> L (in GM2G2; dbSNP:rs28942073)"
FT                   /evidence="ECO:0000269|PubMed:1531140,
FT                   ECO:0000269|PubMed:7557963"
FT                   /id="VAR_003251"
FT   VARIANT         456
FT                   /note="Y -> S (in GM2G2; dbSNP:rs121907982)"
FT                   /evidence="ECO:0000269|PubMed:1720305"
FT                   /id="VAR_003252"
FT   VARIANT         504
FT                   /note="P -> S (in GM2G2; decreases the isozyme A transport
FT                   out of the endoplasmic reticulum. Lowers its heat
FT                   stability. Affects the ability of isozyme A to hydrolyze
FT                   GM2 ganglioside; dbSNP:rs121907985)"
FT                   /evidence="ECO:0000269|PubMed:9694901"
FT                   /id="VAR_011705"
FT   VARIANT         505
FT                   /note="R -> Q (in GM2G2; dbSNP:rs121907983)"
FT                   /evidence="ECO:0000269|PubMed:8357844,
FT                   ECO:0000269|PubMed:8950198"
FT                   /id="VAR_003253"
FT   VARIANT         534
FT                   /note="C -> Y (in GM2G2; infantile type;
FT                   dbSNP:rs727503960)"
FT                   /evidence="ECO:0000269|PubMed:7626071"
FT                   /id="VAR_003254"
FT   VARIANT         543
FT                   /note="A -> T (in GM2G2; dbSNP:rs121907984)"
FT                   /evidence="ECO:0000269|PubMed:9401004"
FT                   /id="VAR_011706"
FT   MUTAGEN         211
FT                   /note="R->K: Does not affect the native conformation of the
FT                   isozyme A. Does not affect hydrolysis of GM2 ganglioside by
FT                   the isozyme A."
FT                   /evidence="ECO:0000269|PubMed:8672428"
FT   STRAND          61..71
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           74..76
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          78..81
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          83..86
FT                   /evidence="ECO:0007829|PDB:1O7A"
FT   HELIX           92..105
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          126..131
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          149..153
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          155..164
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           165..178
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          187..196
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          201..212
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           216..228
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          233..237
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           253..258
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          259..261
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          262..264
FT                   /evidence="ECO:0007829|PDB:2GJX"
FT   HELIX           268..280
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          284..294
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           298..301
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          306..308
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          318..322
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           327..343
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          346..352
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           359..362
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           365..373
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           380..397
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          401..405
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           406..410
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          420..423
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           429..438
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          443..445
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           447..449
FT                   /evidence="ECO:0007829|PDB:3LMY"
FT   STRAND          450..453
FT                   /evidence="ECO:0007829|PDB:2GK1"
FT   STRAND          455..457
FT                   /evidence="ECO:0007829|PDB:2GJX"
FT   HELIX           460..465
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           475..479
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          481..488
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           490..492
FT                   /evidence="ECO:0007829|PDB:3LMY"
FT   TURN            495..497
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           498..502
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           505..514
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   HELIX           522..538
FT                   /evidence="ECO:0007829|PDB:1NOW"
FT   STRAND          546..548
FT                   /evidence="ECO:0007829|PDB:1NOW"
SQ   SEQUENCE   556 AA;  63137 MW;  2267BF1453EA50EF CRC64;
     MELCGLGLPR PPMLLALLLA TLLAAMLALL TQVALVVQVA EAARAPSVSA KPGPALWPLP
     LLVKMTPNLL HLAPENFYIS HSPNSTAGPS CTLLEEAFRR YHGYIFGFYK WHHEPAEFQA
     KTQVQQLLVS ITLQSECDAF PNISSDESYT LLVKEPVAVL KANRVWGALR GLETFSQLVY
     QDSYGTFTIN ESTIIDSPRF SHRGILIDTS RHYLPVKIIL KTLDAMAFNK FNVLHWHIVD
     DQSFPYQSIT FPELSNKGSY SLSHVYTPND VRMVIEYARL RGIRVLPEFD TPGHTLSWGK
     GQKDLLTPCY SRQNKLDSFG PINPTLNTTY SFLTTFFKEI SEVFPDQFIH LGGDEVEFKC
     WESNPKIQDF MRQKGFGTDF KKLESFYIQK VLDIIATINK GSIVWQEVFD DKAKLAPGTI
     VEVWKDSAYP EELSRVTASG FPVILSAPWY LDLISYGQDW RKYYKVEPLD FGGTQKQKQL
     FIGGEACLWG EYVDATNLTP RLWPRASAVG ERLWSSKDVR DMDDAYDRLT RHRCRMVERG
     IAAQPLYAGY CNHENM
 
 
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