ID X6L592_9RHOB Unreviewed; 360 AA.
AC X6L592;
DT 11-JUN-2014, integrated into UniProtKB/TrEMBL.
DT 04-MAR-2015, sequence version 2.
DT 27-MAR-2024, entry version 44.
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=P279_06645 {ECO:0000313|EMBL:ETA52804.2};
OS Rhodobacteraceae bacterium PD-2.
OC Bacteria; Pseudomonadota; Alphaproteobacteria; Rhodobacterales;
OC Paracoccaceae.
OX NCBI_TaxID=1169855 {ECO:0000313|EMBL:ETA52804.2, ECO:0000313|Proteomes:UP000023196};
RN [1] {ECO:0000313|EMBL:ETA52804.2, ECO:0000313|Proteomes:UP000023196}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=PD-2 {ECO:0000313|EMBL:ETA52804.2,
RC ECO:0000313|Proteomes:UP000023196};
RX PubMed=25700405;
RA Zheng L., Cui Z., Xu L., Sun C., Powell R.J., Hill R.T.;
RT "Draft Genome Sequence of Rhodobacteraceae Strain PD-2, an Algicidal
RT Bacterium with a Quorum-Sensing System, Isolated from the Marine Microalga
RT Prorocentrum donghaiense.";
RL Genome Announc. Announc.3:e01549-14(2015).
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}.
CC -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC whole genome shotgun (WGS) entry which is preliminary data.
CC {ECO:0000313|EMBL:ETA52804.2}.
CC ---------------------------------------------------------------------------
CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC ---------------------------------------------------------------------------
DR EMBL; AWRV02000020; ETA52804.2; -; Genomic_DNA.
DR AlphaFoldDB; X6L592; -.
DR HOGENOM; CLU_020273_1_2_5; -.
DR OrthoDB; 9793111at2; -.
DR UniPathway; UPA00275; UER00400.
DR Proteomes; UP000023196; Unassembled WGS sequence.
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: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; 3.40.50.10990; GTP cyclohydrolase II; 1.
DR HAMAP; MF_00179; RibA; 1.
DR InterPro; IPR032677; GTP_cyclohydro_II.
DR InterPro; IPR000926; RibA.
DR InterPro; IPR036144; RibA-like_sf.
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 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 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:UP000023196};
KW Riboflavin biosynthesis {ECO:0000256|ARBA:ARBA00022619, ECO:0000256|HAMAP-
KW Rule:MF_00179}; Zinc {ECO:0000256|HAMAP-Rule:MF_00179}.
FT DOMAIN 173..336
FT /note="GTP cyclohydrolase II"
FT /evidence="ECO:0000259|Pfam:PF00925"
FT ACT_SITE 292
FT /note="Proton acceptor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT ACT_SITE 294
FT /note="Nucleophile"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 215..219
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 220
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 231
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 233
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 236
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 258..260
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 280
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 315
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 320
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
SQ SEQUENCE 360 AA; 38355 MW; 4CCD17132C2396C6 CRC64;
MALGPDLNEV LARARGDLRM GVPVMLEDAE GAVVFAAVET LGAERLEALR ALGTPDLVLT
ARRAETLKAR AYYGDVARVV VPDGSGLDWL TDVADPANDM DRPMKGPLET RRGGSAGLQR
LAVRLCKAAR LLPAALAVPV VPGLSALDGL GRIPAEEAAG IMEALPHLGH VIAARVPLRA
AENARLHIWR PEDGSEEHYA IEIGRPDRAA PVLARLHSAC FTGDLLGSLK CDCGPQLNAA
LAQMGQEGAG VLLYLQQEGR GIGLANKMRA YALQDQGFDT VEANHRLGFE DDERDFRLGA
QMLQALGFSS VRLLTNNPAK IAMMERSGIA VAERVPLKVG ETPQNARYLA VKAAKSGHLL
//
