ID   GUAC_STRPB              Reviewed;         327 AA.
AC   Q1JBS5;
DT   26-JUN-2007, integrated into UniProtKB/Swiss-Prot.
DT   26-JUN-2007, sequence version 2.
DT   03-AUG-2022, entry version 80.
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};
GN   OrderedLocusNames=MGAS2096_Spy0931;
OS   Streptococcus pyogenes serotype M12 (strain MGAS2096).
OC   Bacteria; Firmicutes; Bacilli; Lactobacillales; Streptococcaceae;
OC   Streptococcus.
OX   NCBI_TaxID=370553;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MGAS2096;
RX   PubMed=16636287; DOI=10.1073/pnas.0510279103;
RA   Beres S.B., Richter E.W., Nagiec M.J., Sumby P., Porcella S.F., DeLeo F.R.,
RA   Musser J.M.;
RT   "Molecular genetic anatomy of inter- and intraserotype variation in the
RT   human bacterial pathogen group A Streptococcus.";
RL   Proc. Natl. Acad. Sci. U.S.A. 103:7059-7064(2006).
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}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=ABF35983.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; CP000261; ABF35983.1; ALT_INIT; Genomic_DNA.
DR   RefSeq; WP_002989808.1; NC_008023.1.
DR   AlphaFoldDB; Q1JBS5; -.
DR   SMR; Q1JBS5; -.
DR   KEGG; spj:MGAS2096_Spy0931; -.
DR   HOGENOM; CLU_022552_5_0_9; -.
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.
FT   CHAIN           1..327
FT                   /note="GMP reductase"
FT                   /id="PRO_0000292055"
FT   ACT_SITE        176
FT                   /note="Thioimidate intermediate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01511"
FT   BINDING         205..228
FT                   /ligand="NADP(+)"
FT                   /ligand_id="ChEBI:CHEBI:58349"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01511"
SQ   SEQUENCE   327 AA;  35960 MW;  993EAF9F6054AB68 CRC64;
     MFNDIPVFDY EDIQLIPNKC IITSRSQADT SVTLGKYQFK LPVIPANMQT IIDETIAEQL
     AKEGYFYIMH RFDEDSRKPF IKRMHEQGLI ASISVGVKAY EYEFVTSLKE DTPEFITIDI
     AHGHANSVID MIKHIKTELP ETFVIAGNVG TPEAVRELEN AGADATKVGI GPGKVCITKV
     KTGFGTGGWQ LAALRWCAKA ARKPIIADGG IRTHGDIAKS IRFGASMVMI GSLFAGHIES
     PGKTVEVNGE TFKEYYGSAS AYQKGEHKNV EGKKILLPTK GHLSDTLTEM QQDLQSSISY
     AGGKDLDSLR HVDYVIVKNS IWNGDSI