ID A9NHT6_ACHLI Unreviewed; 396 AA.
AC A9NHT6;
DT 05-FEB-2008, integrated into UniProtKB/TrEMBL.
DT 05-FEB-2008, sequence version 1.
DT 27-MAR-2024, entry version 116.
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=ribBA {ECO:0000313|EMBL:ABX81916.1};
GN Synonyms=ribA {ECO:0000256|HAMAP-Rule:MF_00179};
GN OrderedLocusNames=ACL_1321 {ECO:0000313|EMBL:ABX81916.1};
OS Acholeplasma laidlawii (strain PG-8A).
OC Bacteria; Mycoplasmatota; Mollicutes; Acholeplasmatales;
OC Acholeplasmataceae; Acholeplasma.
OX NCBI_TaxID=441768 {ECO:0000313|EMBL:ABX81916.1, ECO:0000313|Proteomes:UP000008558};
RN [1] {ECO:0000313|EMBL:ABX81916.1, ECO:0000313|Proteomes:UP000008558}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=PG-8A {ECO:0000313|EMBL:ABX81916.1,
RC ECO:0000313|Proteomes:UP000008558};
RX PubMed=21784942; DOI=10.1128/JB.05059-11;
RA Lazarev V.N., Levitskii S.A., Basovskii Y.I., Chukin M.M., Akopian T.A.,
RA Vereshchagin V.V., Kostrjukova E.S., Kovaleva G.Y., Kazanov M.D.,
RA Malko D.B., Vitreschak A.G., Sernova N.V., Gelfand M.S., Demina I.A.,
RA Serebryakova M.V., Galyamina M.A., Vtyurin N.N., Rogov S.I., Alexeev D.G.,
RA Ladygina V.G., Govorun V.M.;
RT "Complete genome and proteome of Acholeplasma laidlawii.";
RL J. Bacteriol. 193:4943-4953(2011).
CC -!- FUNCTION: Catalyzes the conversion of D-ribulose 5-phosphate to formate
CC and 3,4-dihydroxy-2-butanone 4-phosphate.
CC {ECO:0000256|ARBA:ARBA00002284}.
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; 2-hydroxy-3-
CC oxobutyl phosphate from D-ribulose 5-phosphate: step 1/1.
CC {ECO:0000256|ARBA:ARBA00004904}.
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 -!- SIMILARITY: In the N-terminal section; belongs to the DHBP synthase
CC family. {ECO:0000256|ARBA:ARBA00005520}.
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DR EMBL; CP000896; ABX81916.1; -; Genomic_DNA.
DR RefSeq; WP_012243247.1; NC_010163.1.
DR AlphaFoldDB; A9NHT6; -.
DR STRING; 441768.ACL_1321; -.
DR GeneID; 66294303; -.
DR KEGG; acl:ACL_1321; -.
DR eggNOG; COG0108; Bacteria.
DR eggNOG; COG0807; Bacteria.
DR HOGENOM; CLU_020273_1_2_14; -.
DR OrthoDB; 9793111at2; -.
DR UniPathway; UPA00275; UER00399.
DR Proteomes; UP000008558; Chromosome.
DR GO; GO:0008686; F:3,4-dihydroxy-2-butanone-4-phosphate synthase activity; IEA:UniProtKB-EC.
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; 3.90.870.10; DHBP synthase; 1.
DR Gene3D; 3.40.50.10990; GTP cyclohydrolase II; 1.
DR HAMAP; MF_00179; RibA; 1.
DR InterPro; IPR017945; DHBP_synth_RibB-like_a/b_dom.
DR InterPro; IPR000422; DHBP_synthase_RibB.
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; PF00926; DHBP_synthase; 1.
DR Pfam; PF00925; GTP_cyclohydro2; 1.
DR PIRSF; PIRSF001259; RibA; 1.
DR SUPFAM; SSF142695; RibA-like; 1.
DR SUPFAM; SSF55821; YrdC/RibB; 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|ARBA:ARBA00022723, ECO:0000256|HAMAP-
KW Rule:MF_00179};
KW Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741, ECO:0000256|HAMAP-
KW Rule:MF_00179}; Reference proteome {ECO:0000313|Proteomes:UP000008558};
KW Riboflavin biosynthesis {ECO:0000256|ARBA:ARBA00022619, ECO:0000256|HAMAP-
KW Rule:MF_00179}; Zinc {ECO:0000256|HAMAP-Rule:MF_00179}.
FT DOMAIN 203..367
FT /note="GTP cyclohydrolase II"
FT /evidence="ECO:0000259|Pfam:PF00925"
FT ACT_SITE 324
FT /note="Proton acceptor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT ACT_SITE 326
FT /note="Nucleophile"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 247..251
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 252
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 263
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 265
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 268
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 290..292
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 312
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 347
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 352
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
SQ SEQUENCE 396 AA; 44068 MW; C9EEEC7BE87298C1 CRC64;
MEFNTVQSII EAIKMSKPVI VVDDHDLQNT GSLIFNAEKL NLENINFLKE YGDKYIYVAA
SKQFYEGLNI DPVYEVVGSM HAFKDTTISL TDTHKDDPSN ILATTQSVLN KKKVEYHKNG
VVFPLITRLG GTLKRVAHPE AIVDLSELAN LKPVGVLSLL LNKDKQPMKM DEIIAFATKH
ALPIVSVESI IRYRQMTESL VKKAAEAKLP TKHGEFRMVG FENAISGEHH VALVKGDIKP
GEEVLVRVHS ECLTGDAFGS LKCDCGEQLQ AALDNIEKAG KGVLLYMRQE GRGIGLINKI
KAYHLQDLGM DTVEANIALG FEEDLRDYGI GAQILKDLGV GKIRLMTNNP LKISGLSGYG
LEITSREPII LNHNEKNEEY LRTKQKKMGH LLKYKD
//
