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PURR_ECOLI
ID   PURR_ECOLI              Reviewed;         341 AA.
AC   P0ACP7; P15039; Q83RB1;
DT   22-NOV-2005, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   03-AUG-2022, entry version 129.
DE   RecName: Full=HTH-type transcriptional repressor PurR;
DE   AltName: Full=Pur regulon repressor;
DE   AltName: Full=Purine nucleotide synthesis repressor;
GN   Name=purR; OrderedLocusNames=b1658, JW1650;
OS   Escherichia coli (strain K12).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Escherichia.
OX   NCBI_TaxID=83333;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=3058704; DOI=10.1016/s0021-9258(19)77686-8;
RA   Rolfes R.J., Zalkin H.;
RT   "Escherichia coli gene purR encoding a repressor protein for purine
RT   nucleotide synthesis. Cloning, nucleotide sequence, and interaction with
RT   the purF operator.";
RL   J. Biol. Chem. 263:19653-19661(1988).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA], FUNCTION, AND INDUCTION.
RC   STRAIN=K12;
RX   PubMed=2404765; DOI=10.1111/j.1432-1033.1990.tb15314.x;
RA   Meng L.M., Kilstrup M., Nygaard P.;
RT   "Autoregulation of PurR repressor synthesis and involvement of purR in the
RT   regulation of purB, purC, purL, purMN and guaBA expression in Escherichia
RT   coli.";
RL   Eur. J. Biochem. 187:373-379(1990).
RN   [3]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=K12 / W3110 / ATCC 27325 / DSM 5911;
RX   PubMed=9097039; DOI=10.1093/dnares/3.6.363;
RA   Aiba H., Baba T., Fujita K., Hayashi K., Inada T., Isono K., Itoh T.,
RA   Kasai H., Kashimoto K., Kimura S., Kitakawa M., Kitagawa M., Makino K.,
RA   Miki T., Mizobuchi K., Mori H., Mori T., Motomura K., Nakade S.,
RA   Nakamura Y., Nashimoto H., Nishio Y., Oshima T., Saito N., Sampei G.,
RA   Seki Y., Sivasundaram S., Tagami H., Takeda J., Takemoto K., Takeuchi Y.,
RA   Wada C., Yamamoto Y., Horiuchi T.;
RT   "A 570-kb DNA sequence of the Escherichia coli K-12 genome corresponding to
RT   the 28.0-40.1 min region on the linkage map.";
RL   DNA Res. 3:363-377(1996).
RN   [4]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=K12 / MG1655 / ATCC 47076;
RX   PubMed=9278503; DOI=10.1126/science.277.5331.1453;
RA   Blattner F.R., Plunkett G. III, Bloch C.A., Perna N.T., Burland V.,
RA   Riley M., Collado-Vides J., Glasner J.D., Rode C.K., Mayhew G.F.,
RA   Gregor J., Davis N.W., Kirkpatrick H.A., Goeden M.A., Rose D.J., Mau B.,
RA   Shao Y.;
RT   "The complete genome sequence of Escherichia coli K-12.";
RL   Science 277:1453-1462(1997).
RN   [5]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=K12 / W3110 / ATCC 27325 / DSM 5911;
RX   PubMed=16738553; DOI=10.1038/msb4100049;
RA   Hayashi K., Morooka N., Yamamoto Y., Fujita K., Isono K., Choi S.,
RA   Ohtsubo E., Baba T., Wanner B.L., Mori H., Horiuchi T.;
RT   "Highly accurate genome sequences of Escherichia coli K-12 strains MG1655
RT   and W3110.";
RL   Mol. Syst. Biol. 2:E1-E5(2006).
RN   [6]
RP   PROTEIN SEQUENCE OF 2-7, FUNCTION, AND IDENTIFICATION OF COREPRESSORS.
RX   PubMed=2211500; DOI=10.1128/jb.172.10.5637-5642.1990;
RA   Rolfes R.J., Zalkin H.;
RT   "Purification of the Escherichia coli purine regulon repressor and
RT   identification of corepressors.";
RL   J. Bacteriol. 172:5637-5642(1990).
RN   [7]
RP   PARTIAL PROTEIN SEQUENCE, FUNCTION, CHARACTERIZATION, AND SUBUNIT.
RX   PubMed=1400170; DOI=10.1128/jb.174.19.6207-6214.1992;
RA   Choi K.Y., Zalkin H.;
RT   "Structural characterization and corepressor binding of the Escherichia
RT   coli purine repressor.";
RL   J. Bacteriol. 174:6207-6214(1992).
RN   [8]
RP   REVIEW.
RA   Zalkin H., Nygaard P.;
RT   "Biosynthesis of purine nucleotides.";
RL   (In) Neidhardt F.C., Curtiss R. III, Ingraham J.L., Lin E.C.C.,
RL   Low K.B. Magasanik B., Reznikoff W.S., Riley M., Schaechter M.,
RL   Umbarger H.E. (eds.);
RL   Escherichia coli and Salmonella: Cellular and molecular biology (2nd ed.),
RL   pp.561-579, American Society for Microbiology Press, Washington D.C.
RL   (1996).
RN   [9]
RP   FUNCTION IN CARAB REPRESSION.
RX   PubMed=14741201; DOI=10.1016/j.jmb.2003.12.024;
RA   Devroede N., Thia-Toong T.-L., Gigot D., Maes D., Charlier D.;
RT   "Purine and pyrimidine-specific repression of the Escherichia coli carAB
RT   operon are functionally and structurally coupled.";
RL   J. Mol. Biol. 336:25-42(2004).
RN   [10]
RP   X-RAY CRYSTALLOGRAPHY (2.7 ANGSTROMS) IN COMPLEX WITH HYPOXANTHINE
RP   COREPRESSOR AND PURF OPERATOR DNA.
RX   PubMed=7973627; DOI=10.1126/science.7973627;
RA   Schumacher M.A., Choi K.Y., Zalkin H., Brennan R.G.;
RT   "Crystal structure of LacI member, PurR, bound to DNA: minor groove binding
RT   by alpha helices.";
RL   Science 266:763-770(1994).
RN   [11]
RP   X-RAY CRYSTALLOGRAPHY (2.2 ANGSTROMS) OF 53-341.
RX   PubMed=7553867; DOI=10.1016/0092-8674(95)90243-0;
RA   Schumacher M.A., Choi K.Y., Lu F., Zalkin H., Brennan R.G.;
RT   "Mechanism of corepressor-mediated specific DNA binding by the purine
RT   repressor.";
RL   Cell 83:147-155(1995).
RN   [12]
RP   STRUCTURE BY NMR OF 1-56.
RX   PubMed=8591032; DOI=10.1016/s0969-2126(01)00257-x;
RA   Nagadoi A., Morikawa S., Nakamura H., Enari M., Kobayashi K., Yamamoto H.,
RA   Sampei G., Mizobuchi K., Schumacher M.A., Brennan R.G., Nishimura Y.;
RT   "Structural comparison of the free and DNA-bound forms of the purine
RT   repressor DNA-binding domain.";
RL   Structure 3:1217-1224(1995).
RN   [13]
RP   X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) IN COMPLEX WITH GUANINE COREPRESSOR
RP   AND PURF OPERATOR DNA.
RX   PubMed=9278422; DOI=10.1074/jbc.272.36.22648;
RA   Schumacher M.A., Glasfeld A., Zalkin H., Brennan R.G.;
RT   "The X-ray structure of the PurR-guanine-purF operator complex reveals the
RT   contributions of complementary electrostatic surfaces and a water-mediated
RT   hydrogen bond to corepressor specificity and binding affinity.";
RL   J. Biol. Chem. 272:22648-22653(1997).
RN   [14]
RP   X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF MUTANTS GLN-190 AND ALA-190 IN
RP   COMPLEXES WITH VARIOUS PURINES AND OPERATOR DNA, AND MUTAGENESIS OF
RP   ARG-190.
RX   PubMed=9454587; DOI=10.1021/bi971942s;
RA   Lu F., Schumacher M.A., Arvidson D.N., Haldimann A., Wanner B.L.,
RA   Zalkin H., Brennan R.G.;
RT   "Structure-based redesign of corepressor specificity of the Escherichia
RT   coli purine repressor by substitution of residue 190.";
RL   Biochemistry 37:971-982(1998).
RN   [15] {ECO:0007744|PDB:1VPW}
RP   X-RAY CRYSTALLOGRAPHY (2.7 ANGSTROMS) OF MUTANT MET-54 IN COMPLEX WITH
RP   HYPOXANTHINE COREPRESSOR AND PURF OPERATOR DNA.
RX   PubMed=9628480; DOI=10.1038/nsb0698-436;
RA   Arvidson D.N., Lu F., Faber C., Zalkin H., Brennan R.G.;
RT   "The structure of PurR mutant L54M shows an alternative route to DNA
RT   kinking.";
RL   Nat. Struct. Biol. 5:436-441(1998).
RN   [16] {ECO:0007744|PDB:1QP0, ECO:0007744|PDB:1QP4, ECO:0007744|PDB:1QP7, ECO:0007744|PDB:1QPZ, ECO:0007744|PDB:1QQA, ECO:0007744|PDB:1QQB}
RP   X-RAY CRYSTALLOGRAPHY (2.5 ANGSTROMS) OF WILD-TYPE AND MUTANT ALA-55 IN
RP   COMPLEXES WITH VARIOUS PURF OPERATOR ANALOGS, AND MUTAGENESIS OF LYS-55.
RX   PubMed=10438625; DOI=10.1006/jmbi.1999.2946;
RA   Glasfeld A., Koehler A.N., Schumacher M.A., Brennan R.G.;
RT   "The role of lysine 55 in determining the specificity of the purine
RT   repressor for its operators through minor groove interactions.";
RL   J. Mol. Biol. 291:347-361(1999).
RN   [17] {ECO:0007744|PDB:1ZAY}
RP   X-RAY CRYSTALLOGRAPHY (2.7 ANGSTROMS) IN COMPLEX WITH HYPOXANTHINE
RP   COREPRESSOR AND PURF OPERATOR ANALOG.
RA   Zheleznova E.E., Brennan R.G.;
RT   "The roles of exocyclic groups in the central base-pair step in modulating
RT   the affinity of PurR for its operator.";
RL   Submitted (DEC-1999) to the PDB data bank.
RN   [18] {ECO:0007744|PDB:1JFS, ECO:0007744|PDB:1JFT, ECO:0007744|PDB:1JH9, ECO:0007744|PDB:1JHZ}
RP   X-RAY CRYSTALLOGRAPHY (2.4 ANGSTROMS) OF MUTANTS ARG-147; PHE-147 AND
RP   ALA-147 UNCOMPLEXED AND IN COMPLEX WITH HYPOXANTHINE COREPRESSOR AND PURF
RP   OPERATOR DNA, AND MUTAGENESIS OF TRP-147.
RX   PubMed=11781089; DOI=10.1021/bi0156660;
RA   Huffman J.L., Lu F., Zalkin H., Brennan R.G.;
RT   "Role of residue 147 in the gene regulatory function of the Escherichia
RT   coli purine repressor.";
RL   Biochemistry 41:511-520(2002).
CC   -!- FUNCTION: Is the main repressor of the genes involved in the de novo
CC       synthesis of purine nucleotides, regulating purB, purC, purEK, purF,
CC       purHD, purL, purMN and guaBA expression. In addition, it participates
CC       in the regulation or coregulation of genes involved in de novo
CC       pyrimidine nucleotide biosynthesis, salvage and uptake (pyrC, pyrD,
CC       carAB and codBA), and of several genes encoding enzymes necessary for
CC       nucleotide and polyamine biosynthesis (prsA, glyA, gcvTHP, speA, glnB).
CC       Binds to a 16-bp palindromic sequence located within the promoter
CC       region of pur regulon genes. The consensus binding sequence is 5'-
CC       ACGCAAACGTTTTCNT-3'. PurR is allosterically activated to bind its
CC       cognate DNA by binding the purine corepressors, hypoxanthine or
CC       guanine, thereby effecting transcription repression.
CC       {ECO:0000269|PubMed:1400170, ECO:0000269|PubMed:14741201,
CC       ECO:0000269|PubMed:2211500, ECO:0000269|PubMed:2404765}.
CC   -!- PATHWAY: Purine metabolism; purine nucleotide biosynthesis
CC       [regulation].
CC   -!- SUBUNIT: Homodimer. {ECO:0000269|PubMed:11781089,
CC       ECO:0000269|PubMed:1400170, ECO:0000269|PubMed:7973627,
CC       ECO:0000269|PubMed:9278422, ECO:0000269|PubMed:9628480,
CC       ECO:0000269|Ref.17}.
CC   -!- INTERACTION:
CC       P0ACP7; P64503: yebV; NbExp=4; IntAct=EBI-1115258, EBI-9126792;
CC   -!- INDUCTION: Negatively autoregulated. {ECO:0000269|PubMed:2404765}.
CC   -!- DOMAIN: Consists of two structural and functional domains: an N-
CC       terminal DNA-binding domain, approximately the first 60 residues, and a
CC       larger C-terminal domain, approximately 280 residues, which imparts the
CC       function of corepressor binding and oligomerization.
CC   -!- MISCELLANEOUS: The corepressors hypoxanthine and guanine bind
CC       cooperatively to single PurR sites in each subunit of the dimer,
CC       inducing a conformational change which increases the affinity of PurR
CC       for its DNA operator sites.
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DR   EMBL; J04212; AAA24457.1; -; Genomic_DNA.
DR   EMBL; X51368; CAA35753.1; -; Genomic_DNA.
DR   EMBL; U00096; AAC74730.1; -; Genomic_DNA.
DR   EMBL; AP009048; BAA15424.1; -; Genomic_DNA.
DR   PIR; A32027; RPECDU.
DR   RefSeq; NP_416175.1; NC_000913.3.
DR   RefSeq; WP_000190982.1; NZ_STEB01000003.1.
DR   PDB; 1BDH; X-ray; 2.70 A; A=2-341.
DR   PDB; 1BDI; X-ray; 3.00 A; A=2-341.
DR   PDB; 1DBQ; X-ray; 2.20 A; A/B=53-341.
DR   PDB; 1JFS; X-ray; 2.90 A; A=2-341.
DR   PDB; 1JFT; X-ray; 2.50 A; A=2-341.
DR   PDB; 1JH9; X-ray; 2.55 A; A=2-341.
DR   PDB; 1JHZ; X-ray; 2.40 A; A/B=53-341.
DR   PDB; 1PNR; X-ray; 2.70 A; A=2-341.
DR   PDB; 1PRU; NMR; -; A=1-56.
DR   PDB; 1PRV; NMR; -; A=1-56.
DR   PDB; 1QP0; X-ray; 2.90 A; A=2-341.
DR   PDB; 1QP4; X-ray; 3.00 A; A=2-341.
DR   PDB; 1QP7; X-ray; 2.90 A; A=2-341.
DR   PDB; 1QPZ; X-ray; 2.50 A; A=2-341.
DR   PDB; 1QQA; X-ray; 3.00 A; A=2-341.
DR   PDB; 1QQB; X-ray; 2.70 A; A=2-341.
DR   PDB; 1VPW; X-ray; 2.70 A; A=2-341.
DR   PDB; 1WET; X-ray; 2.60 A; A=2-341.
DR   PDB; 1ZAY; X-ray; 2.70 A; A=2-341.
DR   PDB; 2PUA; X-ray; 2.90 A; A=2-341.
DR   PDB; 2PUB; X-ray; 2.70 A; A=2-341.
DR   PDB; 2PUC; X-ray; 2.60 A; A=2-341.
DR   PDB; 2PUD; X-ray; 2.60 A; A=2-341.
DR   PDB; 2PUE; X-ray; 2.70 A; A=2-341.
DR   PDB; 2PUF; X-ray; 3.00 A; A=2-341.
DR   PDB; 2PUG; X-ray; 2.70 A; A=2-341.
DR   PDBsum; 1BDH; -.
DR   PDBsum; 1BDI; -.
DR   PDBsum; 1DBQ; -.
DR   PDBsum; 1JFS; -.
DR   PDBsum; 1JFT; -.
DR   PDBsum; 1JH9; -.
DR   PDBsum; 1JHZ; -.
DR   PDBsum; 1PNR; -.
DR   PDBsum; 1PRU; -.
DR   PDBsum; 1PRV; -.
DR   PDBsum; 1QP0; -.
DR   PDBsum; 1QP4; -.
DR   PDBsum; 1QP7; -.
DR   PDBsum; 1QPZ; -.
DR   PDBsum; 1QQA; -.
DR   PDBsum; 1QQB; -.
DR   PDBsum; 1VPW; -.
DR   PDBsum; 1WET; -.
DR   PDBsum; 1ZAY; -.
DR   PDBsum; 2PUA; -.
DR   PDBsum; 2PUB; -.
DR   PDBsum; 2PUC; -.
DR   PDBsum; 2PUD; -.
DR   PDBsum; 2PUE; -.
DR   PDBsum; 2PUF; -.
DR   PDBsum; 2PUG; -.
DR   AlphaFoldDB; P0ACP7; -.
DR   SMR; P0ACP7; -.
DR   BioGRID; 4260271; 7.
DR   BioGRID; 849611; 1.
DR   DIP; DIP-35931N; -.
DR   IntAct; P0ACP7; 8.
DR   STRING; 511145.b1658; -.
DR   jPOST; P0ACP7; -.
DR   PaxDb; P0ACP7; -.
DR   PRIDE; P0ACP7; -.
DR   EnsemblBacteria; AAC74730; AAC74730; b1658.
DR   EnsemblBacteria; BAA15424; BAA15424; BAA15424.
DR   GeneID; 66674449; -.
DR   GeneID; 945226; -.
DR   KEGG; ecj:JW1650; -.
DR   KEGG; eco:b1658; -.
DR   PATRIC; fig|1411691.4.peg.599; -.
DR   EchoBASE; EB0793; -.
DR   eggNOG; COG1609; Bacteria.
DR   HOGENOM; CLU_037628_6_2_6; -.
DR   InParanoid; P0ACP7; -.
DR   OMA; ARWVGPP; -.
DR   PhylomeDB; P0ACP7; -.
DR   BioCyc; EcoCyc:PD00219; -.
DR   BioCyc; MetaCyc:PD00219; -.
DR   UniPathway; UPA00488; -.
DR   EvolutionaryTrace; P0ACP7; -.
DR   PRO; PR:P0ACP7; -.
DR   Proteomes; UP000000318; Chromosome.
DR   Proteomes; UP000000625; Chromosome.
DR   GO; GO:0005829; C:cytosol; IDA:EcoCyc.
DR   GO; GO:0003700; F:DNA-binding transcription factor activity; IBA:GO_Central.
DR   GO; GO:0001217; F:DNA-binding transcription repressor activity; IDA:EcoCyc.
DR   GO; GO:0002057; F:guanine binding; IDA:EcoCyc.
DR   GO; GO:0000976; F:transcription cis-regulatory region binding; IBA:GO_Central.
DR   GO; GO:1900372; P:negative regulation of purine nucleotide biosynthetic process; IMP:EcoCyc.
DR   GO; GO:0045892; P:negative regulation of transcription, DNA-templated; IMP:EcoCyc.
DR   GO; GO:0006164; P:purine nucleotide biosynthetic process; IEA:UniProtKB-UniPathway.
DR   GO; GO:0006355; P:regulation of transcription, DNA-templated; IBA:GO_Central.
DR   CDD; cd01392; HTH_LacI; 1.
DR   Gene3D; 1.10.260.40; -; 1.
DR   HAMAP; MF_01277; HTH_type_PurR; 1.
DR   InterPro; IPR000843; HTH_LacI.
DR   InterPro; IPR046335; LacI/GalR-like_sensor.
DR   InterPro; IPR010982; Lambda_DNA-bd_dom_sf.
DR   InterPro; IPR028082; Peripla_BP_I.
DR   InterPro; IPR023588; Tscrpt_reg_HTH_PurR.
DR   Pfam; PF00356; LacI; 1.
DR   Pfam; PF13377; Peripla_BP_3; 1.
DR   PRINTS; PR00036; HTHLACI.
DR   SMART; SM00354; HTH_LACI; 1.
DR   SUPFAM; SSF47413; SSF47413; 1.
DR   SUPFAM; SSF53822; SSF53822; 1.
DR   PROSITE; PS00356; HTH_LACI_1; 1.
DR   PROSITE; PS50932; HTH_LACI_2; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Direct protein sequencing; DNA-binding; Purine biosynthesis;
KW   Reference proteome; Repressor; Transcription; Transcription regulation.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000269|PubMed:2211500"
FT   CHAIN           2..341
FT                   /note="HTH-type transcriptional repressor PurR"
FT                   /id="PRO_0000107976"
FT   DOMAIN          2..56
FT                   /note="HTH lacI-type"
FT   DNA_BIND        4..23
FT                   /note="H-T-H motif"
FT   DNA_BIND        48..56
FT   BINDING         73
FT                   /ligand="hypoxanthine"
FT                   /ligand_id="ChEBI:CHEBI:17368"
FT                   /evidence="ECO:0000269|PubMed:11781089,
FT                   ECO:0000269|PubMed:9628480, ECO:0000269|Ref.17,
FT                   ECO:0007744|PDB:1JFS, ECO:0007744|PDB:1VPW,
FT                   ECO:0007744|PDB:1ZAY"
FT   BINDING         190
FT                   /ligand="hypoxanthine"
FT                   /ligand_id="ChEBI:CHEBI:17368"
FT                   /evidence="ECO:0000269|PubMed:11781089,
FT                   ECO:0000269|PubMed:9628480, ECO:0000269|Ref.17,
FT                   ECO:0007744|PDB:1JFS, ECO:0007744|PDB:1VPW,
FT                   ECO:0007744|PDB:1ZAY"
FT   BINDING         192
FT                   /ligand="hypoxanthine"
FT                   /ligand_id="ChEBI:CHEBI:17368"
FT                   /evidence="ECO:0000269|PubMed:11781089,
FT                   ECO:0000269|PubMed:9628480, ECO:0000269|Ref.17,
FT                   ECO:0007744|PDB:1JFS, ECO:0007744|PDB:1VPW,
FT                   ECO:0007744|PDB:1ZAY"
FT   BINDING         221
FT                   /ligand="hypoxanthine"
FT                   /ligand_id="ChEBI:CHEBI:17368"
FT                   /evidence="ECO:0000269|PubMed:11781089,
FT                   ECO:0000269|PubMed:9628480, ECO:0000269|Ref.17,
FT                   ECO:0007744|PDB:1JFS, ECO:0007744|PDB:1VPW,
FT                   ECO:0007744|PDB:1ZAY"
FT   BINDING         275
FT                   /ligand="hypoxanthine"
FT                   /ligand_id="ChEBI:CHEBI:17368"
FT                   /evidence="ECO:0000269|PubMed:11781089,
FT                   ECO:0000269|PubMed:9628480, ECO:0000269|Ref.17,
FT                   ECO:0007744|PDB:1JFS, ECO:0007744|PDB:1VPW,
FT                   ECO:0007744|PDB:1ZAY"
FT   SITE            190
FT                   /note="Is the key determinant of 6-oxopurine corepressor
FT                   specificity"
FT   MUTAGEN         54
FT                   /note="L->M: Slight decrease in operator DNA affinity."
FT   MUTAGEN         55
FT                   /note="K->A: Decrease in operator DNA affinity."
FT                   /evidence="ECO:0000269|PubMed:10438625"
FT   MUTAGEN         147
FT                   /note="W->A: 14-fold increase in corepressor affinity.
FT                   Large increase in repressor activity."
FT                   /evidence="ECO:0000269|PubMed:11781089"
FT   MUTAGEN         147
FT                   /note="W->F: Large decrease in corepressor affinity and in
FT                   repressor activity."
FT                   /evidence="ECO:0000269|PubMed:11781089"
FT   MUTAGEN         147
FT                   /note="W->R: 8-fold increase in corepressor affinity. Large
FT                   increase in repressor activity."
FT                   /evidence="ECO:0000269|PubMed:11781089"
FT   MUTAGEN         190
FT                   /note="R->A: Functional repressor. Corepressor specificity
FT                   is expanded since it allows binding of adenine and 6-
FT                   methylpurine."
FT                   /evidence="ECO:0000269|PubMed:9454587"
FT   MUTAGEN         190
FT                   /note="R->Q: Functional repressor. Corepressor specificity
FT                   is expanded since it allows binding of adenine."
FT                   /evidence="ECO:0000269|PubMed:9454587"
FT   HELIX           4..11
FT                   /evidence="ECO:0007829|PDB:1JFT"
FT   STRAND          12..14
FT                   /evidence="ECO:0007829|PDB:1PRU"
FT   HELIX           15..22
FT                   /evidence="ECO:0007829|PDB:1JFT"
FT   HELIX           30..42
FT                   /evidence="ECO:0007829|PDB:1JFT"
FT   HELIX           49..56
FT                   /evidence="ECO:0007829|PDB:1JFT"
FT   STRAND          61..67
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          69..71
FT                   /evidence="ECO:0007829|PDB:1JH9"
FT   HELIX           72..88
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          91..96
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   HELIX           101..113
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          117..122
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   HELIX           128..136
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   TURN            137..139
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          142..146
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          152..154
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          156..160
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   HELIX           162..175
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          180..184
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   HELIX           195..206
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   HELIX           213..215
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   HELIX           223..234
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          236..238
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          241..246
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   HELIX           248..260
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   TURN            265..268
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          270..275
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   HELIX           280..282
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          283..285
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          288..291
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   HELIX           295..310
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          318..321
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   STRAND          324..326
FT                   /evidence="ECO:0007829|PDB:1DBQ"
FT   HELIX           337..339
FT                   /evidence="ECO:0007829|PDB:1QPZ"
SQ   SEQUENCE   341 AA;  38175 MW;  5D1DA7CA6C72FBBC CRC64;
     MATIKDVAKR ANVSTTTVSH VINKTRFVAE ETRNAVWAAI KELHYSPSAV ARSLKVNHTK
     SIGLLATSSE AAYFAEIIEA VEKNCFQKGY TLILGNAWNN LEKQRAYLSM MAQKRVDGLL
     VMCSEYPEPL LAMLEEYRHI PMVVMDWGEA KADFTDAVID NAFEGGYMAG RYLIERGHRE
     IGVIPGPLER NTGAGRLAGF MKAMEEAMIK VPESWIVQGD FEPESGYRAM QQILSQPHRP
     TAVFCGGDIM AMGALCAADE MGLRVPQDVS LIGYDNVRNA RYFTPALTTI HQPKDSLGET
     AFNMLLDRIV NKREEPQSIE VHPRLIERRS VADGPFRDYR R
 
 
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