BGAL_ECOSM
ID BGAL_ECOSM Reviewed; 1024 AA.
AC B1LIM9;
DT 24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT 29-APR-2008, sequence version 1.
DT 03-AUG-2022, entry version 73.
DE RecName: Full=Beta-galactosidase {ECO:0000255|HAMAP-Rule:MF_01687};
DE Short=Beta-gal {ECO:0000255|HAMAP-Rule:MF_01687};
DE EC=3.2.1.23 {ECO:0000255|HAMAP-Rule:MF_01687};
DE AltName: Full=Lactase {ECO:0000255|HAMAP-Rule:MF_01687};
GN Name=lacZ {ECO:0000255|HAMAP-Rule:MF_01687};
GN OrderedLocusNames=EcSMS35_0375;
OS Escherichia coli (strain SMS-3-5 / SECEC).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC Enterobacteriaceae; Escherichia.
OX NCBI_TaxID=439855;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=SMS-3-5 / SECEC;
RX PubMed=18708504; DOI=10.1128/jb.00661-08;
RA Fricke W.F., Wright M.S., Lindell A.H., Harkins D.M., Baker-Austin C.,
RA Ravel J., Stepanauskas R.;
RT "Insights into the environmental resistance gene pool from the genome
RT sequence of the multidrug-resistant environmental isolate Escherichia coli
RT SMS-3-5.";
RL J. Bacteriol. 190:6779-6794(2008).
CC -!- CATALYTIC ACTIVITY:
CC Reaction=Hydrolysis of terminal non-reducing beta-D-galactose residues
CC in beta-D-galactosides.; EC=3.2.1.23; Evidence={ECO:0000255|HAMAP-
CC Rule:MF_01687};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01687};
CC Note=Binds 2 magnesium ions per monomer. {ECO:0000255|HAMAP-
CC Rule:MF_01687};
CC -!- COFACTOR:
CC Name=Na(+); Xref=ChEBI:CHEBI:29101;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01687};
CC Note=Binds 1 sodium ion per monomer. {ECO:0000255|HAMAP-Rule:MF_01687};
CC -!- SUBUNIT: Homotetramer. {ECO:0000255|HAMAP-Rule:MF_01687}.
CC -!- SIMILARITY: Belongs to the glycosyl hydrolase 2 family.
CC {ECO:0000255|HAMAP-Rule:MF_01687}.
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DR EMBL; CP000970; ACB17296.1; -; Genomic_DNA.
DR RefSeq; WP_000177857.1; NC_010498.1.
DR AlphaFoldDB; B1LIM9; -.
DR SMR; B1LIM9; -.
DR CAZy; GH2; Glycoside Hydrolase Family 2.
DR EnsemblBacteria; ACB17296; ACB17296; EcSMS35_0375.
DR KEGG; ecm:EcSMS35_0375; -.
DR HOGENOM; CLU_002346_0_2_6; -.
DR OMA; SNWQLQG; -.
DR Proteomes; UP000007011; Chromosome.
DR GO; GO:0009341; C:beta-galactosidase complex; IEA:InterPro.
DR GO; GO:0004565; F:beta-galactosidase activity; IEA:UniProtKB-EC.
DR GO; GO:0030246; F:carbohydrate binding; IEA:InterPro.
DR GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-UniRule.
DR GO; GO:0016052; P:carbohydrate catabolic process; IEA:UniProt.
DR Gene3D; 2.60.40.10; -; 2.
DR Gene3D; 2.70.98.10; -; 1.
DR HAMAP; MF_01687; Beta_gal; 1.
DR InterPro; IPR004199; B-gal_small/dom_5.
DR InterPro; IPR036156; Beta-gal/glucu_dom_sf.
DR InterPro; IPR011013; Gal_mutarotase_sf_dom.
DR InterPro; IPR008979; Galactose-bd-like_sf.
DR InterPro; IPR014718; GH-type_carb-bd.
DR InterPro; IPR006101; Glyco_hydro_2.
DR InterPro; IPR023232; Glyco_hydro_2_AS.
DR InterPro; IPR023933; Glyco_hydro_2_beta_Galsidase.
DR InterPro; IPR006103; Glyco_hydro_2_cat.
DR InterPro; IPR023230; Glyco_hydro_2_CS.
DR InterPro; IPR006102; Glyco_hydro_2_Ig-like.
DR InterPro; IPR006104; Glyco_hydro_2_N.
DR InterPro; IPR017853; Glycoside_hydrolase_SF.
DR InterPro; IPR013783; Ig-like_fold.
DR InterPro; IPR032312; LacZ_4.
DR Pfam; PF02929; Bgal_small_N; 1.
DR Pfam; PF16353; DUF4981; 1.
DR Pfam; PF00703; Glyco_hydro_2; 1.
DR Pfam; PF02836; Glyco_hydro_2_C; 1.
DR Pfam; PF02837; Glyco_hydro_2_N; 1.
DR PRINTS; PR00132; GLHYDRLASE2.
DR SMART; SM01038; Bgal_small_N; 1.
DR SUPFAM; SSF49303; SSF49303; 2.
DR SUPFAM; SSF49785; SSF49785; 1.
DR SUPFAM; SSF51445; SSF51445; 1.
DR SUPFAM; SSF74650; SSF74650; 1.
DR PROSITE; PS00719; GLYCOSYL_HYDROL_F2_1; 1.
DR PROSITE; PS00608; GLYCOSYL_HYDROL_F2_2; 1.
PE 3: Inferred from homology;
KW Glycosidase; Hydrolase; Magnesium; Metal-binding; Sodium.
FT CHAIN 1..1024
FT /note="Beta-galactosidase"
FT /id="PRO_0000366990"
FT ACT_SITE 462
FT /note="Proton donor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT ACT_SITE 538
FT /note="Nucleophile"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 103
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 202
FT /ligand="Na(+)"
FT /ligand_id="ChEBI:CHEBI:29101"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 202
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 417
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 419
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 462
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 462
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 538..541
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 598
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 602
FT /ligand="Na(+)"
FT /ligand_id="ChEBI:CHEBI:29101"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 605
FT /ligand="Na(+)"
FT /ligand_id="ChEBI:CHEBI:29101"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 605
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT BINDING 1000
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT SITE 358
FT /note="Transition state stabilizer"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
FT SITE 392
FT /note="Transition state stabilizer"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01687"
SQ SEQUENCE 1024 AA; 116542 MW; A600DCF909D6DBFF CRC64;
MTMITDSLAV VLQRRDWENP GVTQLNRLAA HPHFASWRNS EEARTDRPSQ QLRSLNGEWR
FAWFPAPEAV PESWLDCDLP DADTVVVPSN WQMHGYDAPI YTNVTYPITV NPPFVPAENP
TGCYSLTFNI DECWLQKGQT RIIFDGVNSA FHLWCNGRWV GYGQDSRLPS EFDLSAFLRA
GKNRLAVMVL RWSDGSYLED QDMWRMSGIF RDVSLLHKPT TQISDFHVAT RFNDDFSRAV
LEAEVQMCGE LRDELRVTVS LWQGETQVAS GTTPFGGEII DERGGYADRV TLRLNVENPA
LWSAEIPNLY RAVVELHTAD GTLIEAEACD VGFREVRIEN GLLLLNGKPV LIRGVNRHEH
HPLHGQVMDE QTMVQDILLM KQNNFNAVRC SHYPNHPLWY TLCDRYGLYV VDEANIETHG
MVPMNRLTDD PRWLPAMSER VTRMVQRDRN HPSVIIWSLG NESGHGANHD ALYRWIKSVD
PSRPVQYEGG GADTTATDII CPMYARVDED QPFPAVPKWS IKKWLSLPGE LRPLILCEYA
HAMGNSLGGF AKYWQAFRQY PRLQGGFVWD WVDQSLIKYD ENGNPWSAYG GDFGDTPNDR
QFCMNGLVFA DRTPHPALTE AKHQQQFFQF RLSGRTIEVT SEYLFRHSDN ELLHWSVALD
GKPLASGEMP LDVAPQDKQL IELPELPQPE STGQLWLTVH VVQPNATAWS EAGHISAWQQ
WRLAENLSVA LPSAPHAIPQ LTTSEMDFCI ELGNKRWQFN RQSGFLSQMW IGDEKQLLTP
LRDQFIRAPL DNDIGVSEAT RIDPNAWVER WKAAGHYQAE VALLQCTADI LADAVLITTA
HAWQHQGKTL FISRKTYRID GSGQMAITVD VEVASDTPHP ARIGLTCQLA QVAERVNWLG
LGPQENYPDR LTAACFDRWD LPLSDMYTPY VFPSENGLRC GTRELNYGPH QWRGDFQFNI
SRYSQQQLME TSHRHLLHAE EGTWLNIDGF HMGIGGDDSW SPSVSAEFQL SAGRYHYQLV
WCQK
