ID   GUAC_STRPQ              Reviewed;         327 AA.
AC   P0DB91; Q8K7I6;
DT   27-JUL-2011, integrated into UniProtKB/Swiss-Prot.
DT   27-JUL-2011, sequence version 1.
DT   03-AUG-2022, entry version 47.
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=SPs0992;
OS   Streptococcus pyogenes serotype M3 (strain SSI-1).
OC   Bacteria; Firmicutes; Bacilli; Lactobacillales; Streptococcaceae;
OC   Streptococcus.
OX   NCBI_TaxID=193567;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=SSI-1;
RX   PubMed=12799345; DOI=10.1101/gr.1096703;
RA   Nakagawa I., Kurokawa K., Yamashita A., Nakata M., Tomiyasu Y.,
RA   Okahashi N., Kawabata S., Yamazaki K., Shiba T., Yasunaga T., Hayashi H.,
RA   Hattori M., Hamada S.;
RT   "Genome sequence of an M3 strain of Streptococcus pyogenes reveals a large-
RT   scale genomic rearrangement in invasive strains and new insights into phage
RT   evolution.";
RL   Genome Res. 13:1042-1055(2003).
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; BA000034; BAC64087.1; -; Genomic_DNA.
DR   RefSeq; WP_011054482.1; NC_004606.1.
DR   AlphaFoldDB; P0DB91; -.
DR   SMR; P0DB91; -.
DR   KEGG; sps:SPs0992; -.
DR   HOGENOM; CLU_022552_5_0_9; -.
DR   OMA; AYKEYFG; -.
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_0000411383"
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;  35929 MW;  038D2B9F9151AB93 CRC64;
     MFNDIPVFDY EDIQLIPNKC IITSRSQADT SVTLGKYQFK LPVIPANMQT IIDETIAEQL
     AKEGYFYIMH RFDEDSRKPF IKRMHEQGLI ASISVGVKAC EYEFVTSLKE DAPEFITIDI
     AHGHANSVID MIKHIKTELP ETFVIAGNVG TPEAVRELEN AGADATKVGI GPGKVCITKV
     KTGFGTGGWQ LAALRWCAKA ARKPIIADGG IRTHGDIAKS IRFGASMVMI GSLFAGHIES
     PGKTVEVDGE TFKEYYGSAS EYQKGEHKNV EGKKILLPTK GHLSDTLTEM QQDLQSSISY
     AGGKDLDSLR HVDYVIVKNS IWNGDSI