ID A0A1R4GQT0_9MICC Unreviewed; 476 AA.
AC A0A1R4GQT0;
DT 12-APR-2017, integrated into UniProtKB/TrEMBL.
DT 12-APR-2017, sequence version 1.
DT 27-MAR-2024, entry version 27.
DE RecName: Full=GTP cyclohydrolase-2 {ECO:0000256|HAMAP-Rule:MF_00179};
DE EC=3.5.4.25 {ECO:0000256|HAMAP-Rule:MF_00179};
DE AltName: Full=GTP cyclohydrolase II {ECO:0000256|HAMAP-Rule:MF_00179};
GN Name=ribA {ECO:0000256|HAMAP-Rule:MF_00179};
GN ORFNames=FM101_12525 {ECO:0000313|EMBL:SJM70527.1};
OS Arthrobacter rhombi.
OC Bacteria; Actinomycetota; Actinomycetes; Micrococcales; Micrococcaceae;
OC Arthrobacter.
OX NCBI_TaxID=71253 {ECO:0000313|EMBL:SJM70527.1, ECO:0000313|Proteomes:UP000195913};
RN [1] {ECO:0000313|EMBL:SJM70527.1, ECO:0000313|Proteomes:UP000195913}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=B Ar 00.02 {ECO:0000313|EMBL:SJM70527.1,
RC ECO:0000313|Proteomes:UP000195913};
RA Peterson S.W.;
RL Submitted (FEB-2017) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Catalyzes the conversion of GTP to 2,5-diamino-6-
CC ribosylamino-4(3H)-pyrimidinone 5'-phosphate (DARP), formate and
CC pyrophosphate. {ECO:0000256|ARBA:ARBA00043932, ECO:0000256|HAMAP-
CC Rule:MF_00179}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=GTP + 4 H2O = 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-
CC pyrimidine + formate + 3 H(+) + 2 phosphate; Xref=Rhea:RHEA:23704,
CC ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:15740,
CC ChEBI:CHEBI:37565, ChEBI:CHEBI:43474, ChEBI:CHEBI:58614; EC=3.5.4.25;
CC Evidence={ECO:0000256|ARBA:ARBA00029293, ECO:0000256|HAMAP-
CC Rule:MF_00179};
CC -!- COFACTOR:
CC Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_00179};
CC Note=Binds 1 zinc ion per subunit. {ECO:0000256|HAMAP-Rule:MF_00179};
CC -!- PATHWAY: Cofactor biosynthesis; riboflavin biosynthesis; 5-amino-6-(D-
CC ribitylamino)uracil from GTP: step 1/4. {ECO:0000256|ARBA:ARBA00004853,
CC ECO:0000256|HAMAP-Rule:MF_00179}.
CC -!- SIMILARITY: Belongs to the GTP cyclohydrolase II family.
CC {ECO:0000256|HAMAP-Rule:MF_00179}.
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DR EMBL; FUHW01000040; SJM70527.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A1R4GQT0; -.
DR UniPathway; UPA00275; UER00400.
DR Proteomes; UP000195913; Unassembled WGS sequence.
DR GO; GO:0008703; F:5-amino-6-(5-phosphoribosylamino)uracil reductase activity; IEA:InterPro.
DR GO; GO:0005525; F:GTP binding; IEA:UniProtKB-KW.
DR GO; GO:0003935; F:GTP cyclohydrolase II activity; IEA:UniProtKB-UniRule.
DR GO; GO:0016829; F:lyase activity; IEA:UniProtKB-KW.
DR GO; GO:0008270; F:zinc ion binding; IEA:UniProtKB-UniRule.
DR GO; GO:0009231; P:riboflavin biosynthetic process; IEA:UniProtKB-UniRule.
DR CDD; cd00641; GTP_cyclohydro2; 1.
DR Gene3D; 3.40.430.10; Dihydrofolate Reductase, subunit A; 1.
DR Gene3D; 3.40.50.10990; GTP cyclohydrolase II; 1.
DR HAMAP; MF_00179; RibA; 1.
DR InterPro; IPR024072; DHFR-like_dom_sf.
DR InterPro; IPR032677; GTP_cyclohydro_II.
DR InterPro; IPR000926; RibA.
DR InterPro; IPR036144; RibA-like_sf.
DR InterPro; IPR002734; RibDG_C.
DR NCBIfam; TIGR00505; ribA; 1.
DR PANTHER; PTHR21327:SF18; 3,4-DIHYDROXY-2-BUTANONE 4-PHOSPHATE SYNTHASE; 1.
DR PANTHER; PTHR21327; GTP CYCLOHYDROLASE II-RELATED; 1.
DR Pfam; PF00925; GTP_cyclohydro2; 1.
DR Pfam; PF01872; RibD_C; 1.
DR SUPFAM; SSF53597; Dihydrofolate reductase-like; 1.
DR SUPFAM; SSF142695; RibA-like; 1.
PE 3: Inferred from homology;
KW GTP-binding {ECO:0000256|ARBA:ARBA00023134, ECO:0000256|HAMAP-
KW Rule:MF_00179};
KW Hydrolase {ECO:0000256|ARBA:ARBA00022801, ECO:0000256|HAMAP-Rule:MF_00179};
KW Lyase {ECO:0000313|EMBL:SJM70527.1};
KW Metal-binding {ECO:0000256|HAMAP-Rule:MF_00179};
KW Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741, ECO:0000256|HAMAP-
KW Rule:MF_00179}; Reference proteome {ECO:0000313|Proteomes:UP000195913};
KW Riboflavin biosynthesis {ECO:0000256|ARBA:ARBA00022619, ECO:0000256|HAMAP-
KW Rule:MF_00179}; Zinc {ECO:0000256|HAMAP-Rule:MF_00179}.
FT DOMAIN 17..182
FT /note="GTP cyclohydrolase II"
FT /evidence="ECO:0000259|Pfam:PF00925"
FT DOMAIN 249..424
FT /note="Bacterial bifunctional deaminase-reductase C-
FT terminal"
FT /evidence="ECO:0000259|Pfam:PF01872"
FT ACT_SITE 139
FT /note="Proton acceptor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT ACT_SITE 141
FT /note="Nucleophile"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 61..65
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 66
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 77
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 79
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 82
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 105..107
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 127
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 162
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 167
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
SQ SEQUENCE 476 AA; 51302 MW; 846BA195AD89D13B CRC64;
MSLDFLTSDG TPGVTRLVST HLPTRHGDFQ LLGYRDATGI DHVALTRGDV SATGGPAPLV
RLHSECLTGD ALGSYRCDCG EQLDAALQAI AHAGRGVLIY VRGHEGRGIG LMDKLRAYAL
QDSGVDTVDA NTRLGVPVDA RDYVQSAQIL HELGSTRIRL LSSNPAKQMA LEGLDIEVES
RMRLNVADRA ENSAYLATKR ARMNHDSPPD RDAWDLLVDG RLPEGALSPD EEDLVLRYGP
LVDGNPALVI AQLGQSLDGF IASRTGDACF VTGEEDRKHL HRLRALVDAV VVGAGTVQAD
DCQLTVRAVS GQNPVRVVVD PHARIPHTTT VLTDPRSRTF WLVGPDAVVP EEVEPHVSVH
RFTEEADFEP ASILRFLSGQ GFDRVLIEGG GLTVSRFLRA GSLDRLYLTS APLLVGDGVP
GIRFDGTDAL SGALSAPIRR FVLGDDVCTE FDFSSMRAAT EPTQRAEQQD DTTGQH
//
