CATH Domain 1n3sA01

CATH Classification

Level	CATH Code	Description
	1	Mainly Alpha
	1.10	Orthogonal Bundle
	1.10.286	GTP Cyclohydrolase I; Chain A, domain 1
	1.10.286.10	GTP cyclohydrolase I, N-terminal domain

Domain Context

CATH Clusters

Superfamily	1.10.286.10
Functional Family	GTP cyclohydrolase 1

Enzyme Information

3.5.4.16

GTP cyclohydrolase I.

based on mapping to UniProt P0A6T5

GTP + H(2)O = formate + 2-amino-4-hydroxy-6-(erythro-1,2,3- trihydroxypropyl)-dihydropteridine triphosphate.

-!- The reaction involves hydrolysis of two C-N bonds and isomerization of the pentose unit; the recyclization may be non-enzymic. -!- Involved in the de novo synthesis of tetrahydrobiopterin from GTP, with the other enzymes involved being EC 1.1.1.153 and EC 4.2.3.12.

UniProtKB Entries (1)

P0A6T5

GCH1_ECOLI

Escherichia coli K-12

GTP cyclohydrolase 1

PDB Structure

PDB	1N3S
External Links	PDBSum Proteopedia
Method	X-RAY DIFFRACTION
Organism	Escherichia
Primary Citation	Biosynthesis of Pteridines. Reaction Mechanism of GTP Cyclohydrolase I Rebelo, J., Auerbach, G., Bader, G., Bracher, A., Nar, H., Hoesl, C., Schramek, N., Kaiser, J., Bacher, A., Huber, R., Fischer, M. J.MOL.BIOL.