IMDH_STAA3
ID IMDH_STAA3 Reviewed; 488 AA.
AC Q2FJM6;
DT 15-MAY-2007, integrated into UniProtKB/Swiss-Prot.
DT 21-MAR-2006, sequence version 1.
DT 03-AUG-2022, entry version 93.
DE RecName: Full=Inosine-5'-monophosphate dehydrogenase {ECO:0000255|HAMAP-Rule:MF_01964};
DE Short=IMP dehydrogenase {ECO:0000255|HAMAP-Rule:MF_01964};
DE Short=IMPD {ECO:0000255|HAMAP-Rule:MF_01964};
DE Short=IMPDH {ECO:0000255|HAMAP-Rule:MF_01964};
DE EC=1.1.1.205 {ECO:0000255|HAMAP-Rule:MF_01964};
GN Name=guaB {ECO:0000255|HAMAP-Rule:MF_01964};
GN OrderedLocusNames=SAUSA300_0388;
OS Staphylococcus aureus (strain USA300).
OC Bacteria; Firmicutes; Bacilli; Bacillales; Staphylococcaceae;
OC Staphylococcus.
OX NCBI_TaxID=367830;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=USA300;
RX PubMed=16517273; DOI=10.1016/s0140-6736(06)68231-7;
RA Diep B.A., Gill S.R., Chang R.F., Phan T.H., Chen J.H., Davidson M.G.,
RA Lin F., Lin J., Carleton H.A., Mongodin E.F., Sensabaugh G.F.,
RA Perdreau-Remington F.;
RT "Complete genome sequence of USA300, an epidemic clone of community-
RT acquired meticillin-resistant Staphylococcus aureus.";
RL Lancet 367:731-739(2006).
CC -!- FUNCTION: Catalyzes the conversion of inosine 5'-phosphate (IMP) to
CC xanthosine 5'-phosphate (XMP), the first committed and rate-limiting
CC step in the de novo synthesis of guanine nucleotides, and therefore
CC plays an important role in the regulation of cell growth.
CC {ECO:0000255|HAMAP-Rule:MF_01964}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=H2O + IMP + NAD(+) = H(+) + NADH + XMP; Xref=Rhea:RHEA:11708,
CC ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:57464,
CC ChEBI:CHEBI:57540, ChEBI:CHEBI:57945, ChEBI:CHEBI:58053;
CC EC=1.1.1.205; Evidence={ECO:0000255|HAMAP-Rule:MF_01964};
CC -!- COFACTOR:
CC Name=K(+); Xref=ChEBI:CHEBI:29103;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01964};
CC -!- ACTIVITY REGULATION: Mycophenolic acid (MPA) is a non-competitive
CC inhibitor that prevents formation of the closed enzyme conformation by
CC binding to the same site as the amobile flap. In contrast, mizoribine
CC monophosphate (MZP) is a competitive inhibitor that induces the closed
CC conformation. MPA is a potent inhibitor of mammalian IMPDHs but a poor
CC inhibitor of the bacterial enzymes. MZP is a more potent inhibitor of
CC bacterial IMPDH. {ECO:0000255|HAMAP-Rule:MF_01964}.
CC -!- PATHWAY: Purine metabolism; XMP biosynthesis via de novo pathway; XMP
CC from IMP: step 1/1. {ECO:0000255|HAMAP-Rule:MF_01964}.
CC -!- SUBUNIT: Homotetramer. {ECO:0000255|HAMAP-Rule:MF_01964}.
CC -!- SIMILARITY: Belongs to the IMPDH/GMPR family. {ECO:0000255|HAMAP-
CC Rule:MF_01964}.
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DR EMBL; CP000255; ABD20543.1; -; Genomic_DNA.
DR RefSeq; WP_000264071.1; NZ_CP027476.1.
DR AlphaFoldDB; Q2FJM6; -.
DR SMR; Q2FJM6; -.
DR PRIDE; Q2FJM6; -.
DR EnsemblBacteria; ABD20543; ABD20543; SAUSA300_0388.
DR GeneID; 66838696; -.
DR KEGG; saa:SAUSA300_0388; -.
DR HOGENOM; CLU_022552_1_0_9; -.
DR OMA; MGYCGAK; -.
DR UniPathway; UPA00601; UER00295.
DR Proteomes; UP000001939; Chromosome.
DR GO; GO:0003938; F:IMP dehydrogenase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-UniRule.
DR GO; GO:0000166; F:nucleotide binding; IEA:UniProtKB-UniRule.
DR GO; GO:0006177; P:GMP biosynthetic process; IEA:UniProtKB-UniRule.
DR CDD; cd00381; IMPDH; 1.
DR Gene3D; 3.20.20.70; -; 1.
DR HAMAP; MF_01964; IMPDH; 1.
DR InterPro; IPR013785; Aldolase_TIM.
DR InterPro; IPR000644; CBS_dom.
DR InterPro; IPR046342; CBS_dom_sf.
DR InterPro; IPR005990; IMP_DH.
DR InterPro; IPR015875; IMP_DH/GMP_Rdtase_CS.
DR InterPro; IPR001093; IMP_DH_GMPRt.
DR PANTHER; PTHR11911; PTHR11911; 1.
DR Pfam; PF00571; CBS; 2.
DR Pfam; PF00478; IMPDH; 1.
DR PIRSF; PIRSF000130; IMPDH; 1.
DR SMART; SM00116; CBS; 2.
DR SUPFAM; SSF54631; SSF54631; 1.
DR TIGRFAMs; TIGR01302; IMP_dehydrog; 1.
DR PROSITE; PS51371; CBS; 2.
DR PROSITE; PS00487; IMP_DH_GMP_RED; 1.
PE 3: Inferred from homology;
KW CBS domain; GMP biosynthesis; Metal-binding; NAD; Oxidoreductase;
KW Potassium; Purine biosynthesis; Repeat.
FT CHAIN 1..488
FT /note="Inosine-5'-monophosphate dehydrogenase"
FT /id="PRO_0000287361"
FT DOMAIN 95..153
FT /note="CBS 1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT DOMAIN 157..216
FT /note="CBS 2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT REGION 468..488
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 307
FT /note="Thioimidate intermediate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT ACT_SITE 403
FT /note="Proton acceptor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 250
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 300..302
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 302
FT /ligand="K(+)"
FT /ligand_id="ChEBI:CHEBI:29103"
FT /ligand_note="ligand shared between two tetrameric
FT partners"
FT /note="in other chain"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 304
FT /ligand="K(+)"
FT /ligand_id="ChEBI:CHEBI:29103"
FT /ligand_note="ligand shared between two tetrameric
FT partners"
FT /note="in other chain"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 305
FT /ligand="IMP"
FT /ligand_id="ChEBI:CHEBI:58053"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 307
FT /ligand="K(+)"
FT /ligand_id="ChEBI:CHEBI:29103"
FT /ligand_note="ligand shared between two tetrameric
FT partners"
FT /note="in other chain"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 340..342
FT /ligand="IMP"
FT /ligand_id="ChEBI:CHEBI:58053"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 363..364
FT /ligand="IMP"
FT /ligand_id="ChEBI:CHEBI:58053"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 387..391
FT /ligand="IMP"
FT /ligand_id="ChEBI:CHEBI:58053"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 417
FT /ligand="IMP"
FT /ligand_id="ChEBI:CHEBI:58053"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 471
FT /ligand="K(+)"
FT /ligand_id="ChEBI:CHEBI:29103"
FT /ligand_note="ligand shared between two tetrameric
FT partners"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 472
FT /ligand="K(+)"
FT /ligand_id="ChEBI:CHEBI:29103"
FT /ligand_note="ligand shared between two tetrameric
FT partners"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
FT BINDING 473
FT /ligand="K(+)"
FT /ligand_id="ChEBI:CHEBI:29103"
FT /ligand_note="ligand shared between two tetrameric
FT partners"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01964"
SQ SEQUENCE 488 AA; 52851 MW; C4E945D25D41491D CRC64;
MWESKFAKES LTFDDVLLIP AQSDILPKDV DLSVQLSDKV KLNIPVISAG MDTVTESKMA
IAMARQGGLG VIHKNMGVEE QADEVQKVKR SENGVISNPF FLTPEESVYE AEALMGKYRI
SGVPIVDNKE DRNLVGILTN RDLRFIEDFS IKIVDVMTQE NLITAPVNTT LEEAEKILQK
HKIEKLPLVK DGRLEGLITI KDIEKVIEFP NAAKDEHGRL LVAAAIGISK DTDIRAQKLV
EAGVDVLVID TAHGHSKGVI DQVKHIKKTY PEITLVAGNV ATAEATKDLF EAGADIVKVG
IGPGSICTTR VVAGVGVPQI TAIYDCATEA RKHGKAIIAD GGIKFSGDII KALAAGGHAV
MLGSLLAGTE ESPGATEIFQ GRQYKVYRGM GSLGAMEKGS NDRYFQEDKA PKKFVPEGIE
GRTAYKGALQ DTIYQLMGGV RAGMGYTGSH DLRELREEAQ FTRMGPAGLA ESHPHNIQIT
KESPNYSF
