ID   GUAC_POLNA              Reviewed;         325 AA.
AC   A1VMA8;
DT   10-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   06-FEB-2007, sequence version 1.
DT   03-AUG-2022, entry version 74.
DE   RecName: Full=GMP reductase {ECO:0000255|HAMAP-Rule:MF_01511};
DE            EC=1.7.1.7 {ECO:0000255|HAMAP-Rule:MF_01511};
DE   AltName: Full=Guanosine 5'-monophosphate oxidoreductase {ECO:0000255|HAMAP-Rule:MF_01511};
DE            Short=Guanosine monophosphate reductase {ECO:0000255|HAMAP-Rule:MF_01511};
GN   Name=guaC {ECO:0000255|HAMAP-Rule:MF_01511}; OrderedLocusNames=Pnap_1472;
OS   Polaromonas naphthalenivorans (strain CJ2).
OC   Bacteria; Proteobacteria; Betaproteobacteria; Burkholderiales;
OC   Comamonadaceae; Polaromonas.
OX   NCBI_TaxID=365044;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CJ2;
RX   PubMed=19453698; DOI=10.1111/j.1462-2920.2009.01947.x;
RA   Yagi J.M., Sims D., Brettin T., Bruce D., Madsen E.L.;
RT   "The genome of Polaromonas naphthalenivorans strain CJ2, isolated from coal
RT   tar-contaminated sediment, reveals physiological and metabolic versatility
RT   and evolution through extensive horizontal gene transfer.";
RL   Environ. Microbiol. 11:2253-2270(2009).
CC   -!- FUNCTION: Catalyzes the irreversible NADPH-dependent deamination of GMP
CC       to IMP. It functions in the conversion of nucleobase, nucleoside and
CC       nucleotide derivatives of G to A nucleotides, and in maintaining the
CC       intracellular balance of A and G nucleotides. {ECO:0000255|HAMAP-
CC       Rule:MF_01511}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=IMP + NADP(+) + NH4(+) = GMP + 2 H(+) + NADPH;
CC         Xref=Rhea:RHEA:17185, ChEBI:CHEBI:15378, ChEBI:CHEBI:28938,
CC         ChEBI:CHEBI:57783, ChEBI:CHEBI:58053, ChEBI:CHEBI:58115,
CC         ChEBI:CHEBI:58349; EC=1.7.1.7; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01511};
CC   -!- SIMILARITY: Belongs to the IMPDH/GMPR family. GuaC type 2 subfamily.
CC       {ECO:0000255|HAMAP-Rule:MF_01511}.
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DR   EMBL; CP000529; ABM36786.1; -; Genomic_DNA.
DR   RefSeq; WP_011800873.1; NC_008781.1.
DR   AlphaFoldDB; A1VMA8; -.
DR   SMR; A1VMA8; -.
DR   STRING; 365044.Pnap_1472; -.
DR   EnsemblBacteria; ABM36786; ABM36786; Pnap_1472.
DR   KEGG; pna:Pnap_1472; -.
DR   eggNOG; COG0516; Bacteria.
DR   HOGENOM; CLU_022552_5_0_4; -.
DR   OMA; AYKEYFG; -.
DR   OrthoDB; 532857at2; -.
DR   Proteomes; UP000000644; Chromosome.
DR   GO; GO:1902560; C:GMP reductase complex; IEA:InterPro.
DR   GO; GO:0003920; F:GMP reductase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006163; P:purine nucleotide metabolic process; IEA:UniProtKB-UniRule.
DR   CDD; cd00381; IMPDH; 1.
DR   Gene3D; 3.20.20.70; -; 1.
DR   HAMAP; MF_01511; GMP_reduct_type2; 1.
DR   InterPro; IPR013785; Aldolase_TIM.
DR   InterPro; IPR005994; GuaC_type_2.
DR   InterPro; IPR015875; IMP_DH/GMP_Rdtase_CS.
DR   InterPro; IPR001093; IMP_DH_GMPRt.
DR   Pfam; PF00478; IMPDH; 1.
DR   PIRSF; PIRSF036500; GMP_red_Firmic; 1.
DR   TIGRFAMs; TIGR01306; GMP_reduct_2; 1.
DR   PROSITE; PS00487; IMP_DH_GMP_RED; 1.
PE   3: Inferred from homology;
KW   NADP; Oxidoreductase; Reference proteome.
FT   CHAIN           1..325
FT                   /note="GMP reductase"
FT                   /id="PRO_0000294281"
FT   ACT_SITE        173
FT                   /note="Thioimidate intermediate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01511"
FT   BINDING         202..225
FT                   /ligand="NADP(+)"
FT                   /ligand_id="ChEBI:CHEBI:58349"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01511"
SQ   SEQUENCE   325 AA;  35940 MW;  F79439DE86C2F2DF CRC64;
     MEIFDYDNIL LLPRKCRVES RAECDASVTL GQRSFRIPVV PANMKTVVNE DICVWMAQNG
     YFYVMHRFDL DNLQFVRDMQ ARGVYASISL GVKQPDYDTV DRLVAEGLAP EYITIDIAHG
     HADTVRKMIA YLKNHLPESF VIAGNVATPE AVIDLENWGA DATKVGIGPG KVCITKMKTG
     FGTGGWQLSA LKWCARVATK PIIADGGIRE HGDIAKSIRF GATMVMIGSM LAGLEESPGQ
     TVEVDGKLFK EYYGSASDFN KGEYKHVEGK RILEPIKGKL VDTLREMEED VQSAISYAGG
     TRLMDIRKVN YVVLGGKNSN EDLMM