Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1fbxa_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Bd1fbxb_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Cd1fbxc_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Dd1fbxd_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Ed1fbxe_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Fd1fbxf_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Gd1fbxg_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Hd1fbxh_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Id1fbxi_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Kd1fbxk_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Ld1fbxl_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Md1fbxm_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Nd1fbxn_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Od1fbxo_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)
Jd1fbxj_ Alpha and beta proteins (a+b) T-fold Tetrahydrobiopterin biosynthesis enzymes-like GTP cyclohydrolase I GTP cyclohydrolase I (Escherichia coli ) [TaxId: 562 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
CSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
DSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
ESCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
FSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
GSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
HSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
ISCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
KSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
LSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
MSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
NSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
OSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)
JSCOP2B SuperfamilyTetrahydrobiopterin biosynthesis enzymes-like 8035783 3000283 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AGTP_cyclohydroIe1fbxA1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
BGTP_cyclohydroIe1fbxB1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
CGTP_cyclohydroIe1fbxC1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
DGTP_cyclohydroIe1fbxD1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
EGTP_cyclohydroIe1fbxE1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
FGTP_cyclohydroIe1fbxF1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
GGTP_cyclohydroIe1fbxG1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
HGTP_cyclohydroIe1fbxH1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
IGTP_cyclohydroIe1fbxI1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
KGTP_cyclohydroIe1fbxK1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
LGTP_cyclohydroIe1fbxL1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
MGTP_cyclohydroIe1fbxM1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
NGTP_cyclohydroIe1fbxN1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
OGTP_cyclohydroIe1fbxO1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)
JGTP_cyclohydroIe1fbxJ1 A: a+b two layersX: T-foldH: Tetrahydrobiopterin biosynthesis enzymes-like (From Topology)T: Tetrahydrobiopterin biosynthesis enzymes-likeF: GTP_cyclohydroIECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
A3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
B1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
B3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
C1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
C3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
D1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
D3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
E1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
E3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
F1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
F3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
G1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
G3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
H1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
H3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
I1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
I3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
K1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
K3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
L1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
L3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
M1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
M3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
N1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
N3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
O1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
O3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)
J1.10.286.10 Mainly Alpha Orthogonal Bundle GTP Cyclohydrolase I Chain A, domain 1CATH (4.3.0)
J3.30.1130.10 Alpha Beta 2-Layer Sandwich GTP Cyclohydrolase I, domain 2 GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domainCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B, C, D, E
PF01227GTP cyclohydrolase I (GTP_cyclohydroI)GTP cyclohydrolase IThis family includes GTP cyclohydrolase enzymes and a family of related bacterial proteins including Swiss:Q46920.Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B, C, D, E
GTP CYCLOHYDROLASE I

InterPro: Protein Family Classification InterPro Database Homepage

ChainsAccessionNameType
A, B, C, D, E
IPR020602GTP cyclohydrolase I domainDomain
A, B, C, D, E
IPR043133GTP cyclohydrolase I, C-terminal/NADPH-dependent 7-cyano-7-deazaguanine reductaseHomologous Superfamily
A, B, C, D, E
IPR043134GTP cyclohydrolase I, N-terminal domainHomologous Superfamily
A, B, C, D, E
IPR018234GTP cyclohydrolase I, conserved siteConserved Site
A, B, C, D, E
IPR001474GTP cyclohydrolase IFamily

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
GTP cyclohydrolase I  M-CSA #38

GTP cyclohydrolase I catalyses the complex reaction which converts GTP to dihydroneopterin triphosphate. This is the first step of a pathway, which in plants and micro-organisms leads to tetrahydrofolate production, and in animals leads to tetrahydrobiopterin production. Tetrahydrobiopterin is biologically important as it serves as a cofactor in the production of catecholamines and nitric oxide. Genetic defects in GTP cyclohydrolase can therefore lead to severe neurological disorders. Enzymes involved in the formation of tetrahydrofolate are also important anti-infection drug targets.

Allosteric enzyme. Activity is modulated by K+, divalent cations, UTP, and tetrahydrobiopterin. Tetrahydrobiopterin is an inhibitor of this enzyme.

Defined by 7 residues: CYS:A-110GLU:A-111HIS:A-112HIS:A-113GLN:A-151HIS:A-179CYS:A-181
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