ID   PURR_ECOK1              Reviewed;         341 AA.
AC   A1ABJ9;
DT   06-MAR-2007, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 1.
DT   03-AUG-2022, entry version 93.
DE   RecName: Full=HTH-type transcriptional repressor PurR {ECO:0000255|HAMAP-Rule:MF_01277};
DE   AltName: Full=Pur regulon repressor {ECO:0000255|HAMAP-Rule:MF_01277};
DE   AltName: Full=Purine nucleotide synthesis repressor {ECO:0000255|HAMAP-Rule:MF_01277};
GN   Name=purR {ECO:0000255|HAMAP-Rule:MF_01277}; OrderedLocusNames=Ecok1_15450;
GN   ORFNames=APECO1_738;
OS   Escherichia coli O1:K1 / APEC.
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Escherichia.
OX   NCBI_TaxID=405955;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=17293413; DOI=10.1128/jb.01726-06;
RA   Johnson T.J., Kariyawasam S., Wannemuehler Y., Mangiamele P., Johnson S.J.,
RA   Doetkott C., Skyberg J.A., Lynne A.M., Johnson J.R., Nolan L.K.;
RT   "The genome sequence of avian pathogenic Escherichia coli strain O1:K1:H7
RT   shares strong similarities with human extraintestinal pathogenic E. coli
RT   genomes.";
RL   J. Bacteriol. 189:3228-3236(2007).
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. PurR is allosterically
CC       activated to bind its cognate DNA by binding the purine corepressors,
CC       hypoxanthine or guanine, thereby effecting transcription repression.
CC       {ECO:0000255|HAMAP-Rule:MF_01277}.
CC   -!- PATHWAY: Purine metabolism; purine nucleotide biosynthesis
CC       [regulation].
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_01277}.
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       {ECO:0000255|HAMAP-Rule:MF_01277}.
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DR   EMBL; CP000468; ABJ01039.1; -; Genomic_DNA.
DR   RefSeq; WP_000190985.1; NC_008563.1.
DR   AlphaFoldDB; A1ABJ9; -.
DR   SMR; A1ABJ9; -.
DR   EnsemblBacteria; ABJ01039; ABJ01039; APECO1_738.
DR   KEGG; ecv:APECO1_738; -.
DR   HOGENOM; CLU_037628_6_2_6; -.
DR   OMA; ARWVGPP; -.
DR   UniPathway; UPA00488; -.
DR   Proteomes; UP000008216; Chromosome.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0045892; P:negative regulation of transcription, DNA-templated; IEA:UniProtKB-UniRule.
DR   GO; GO:0006164; P:purine nucleotide biosynthetic process; IEA:UniProtKB-UniPathway.
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   3: Inferred from homology;
KW   DNA-binding; Purine biosynthesis; Repressor; Transcription;
KW   Transcription regulation.
FT   CHAIN           1..341
FT                   /note="HTH-type transcriptional repressor PurR"
FT                   /id="PRO_0000279656"
FT   DOMAIN          2..56
FT                   /note="HTH lacI-type"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01277"
FT   DNA_BIND        4..23
FT                   /note="H-T-H motif"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01277"
FT   DNA_BIND        48..56
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01277"
FT   BINDING         73
FT                   /ligand="hypoxanthine"
FT                   /ligand_id="ChEBI:CHEBI:17368"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01277"
FT   BINDING         190
FT                   /ligand="hypoxanthine"
FT                   /ligand_id="ChEBI:CHEBI:17368"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01277"
FT   BINDING         192
FT                   /ligand="hypoxanthine"
FT                   /ligand_id="ChEBI:CHEBI:17368"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01277"
FT   BINDING         221
FT                   /ligand="hypoxanthine"
FT                   /ligand_id="ChEBI:CHEBI:17368"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01277"
FT   BINDING         275
FT                   /ligand="hypoxanthine"
FT                   /ligand_id="ChEBI:CHEBI:17368"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01277"
SQ   SEQUENCE   341 AA;  38165 MW;  5EED9B39A34E0B83 CRC64;
     MATIKDVAKR ANVSTTTVSH VINKTRFVAE ETRNAVWAAI KELHYSPSAV ARSLKVNHTK
     SIGLLATSSE AAYFAEIIEA VEKNCFQKGY TLILGNAWNN LEKQRAYLSM MAQKRVDGLL
     VMCSEYPEPL LAMLEEYRHI PMVVMDWGEA KADFTDAVID NAFEGGYMAG RYLIERGHRE
     IGVIPGPLER NTGAGRLAGF MKAMEEAMIK VPESWIVQGD FEPESGYRAM QQILSQSHRP
     TAVFCGGDIM AMGALCAADE MGLRVPQDVS LIGYDNVRNA RYFTPALTTI HQPKDSLGET
     AFNMLLDRIV NKREEPQSIE VHPRLIERRS VADGPFRDYR R