CATH Domain 1a9cD02

CATH Classification

Level	CATH Code	Description
	3	Alpha Beta
	3.30	2-Layer Sandwich
	3.30.1130	GTP Cyclohydrolase I, domain 2
	3.30.1130.10	GTP cyclohydrolase I, C-terminal domain/NADPH-dependent 7-cyano-7-deazaguanine reductase, N-terminal domain

Domain Context

CATH Clusters

Superfamily	3.30.1130.10
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	1A9C
External Links	PDBSum Proteopedia
Method	X-RAY DIFFRACTION
Organism	Escherichia
Primary Citation	GTP Cyclohydrolase I in Complex with GTP at 2.1 A Resolution Auerbach, G., Bracher, A., Nar, H., Fischer, M., Hoesl, C., Huber, R., Bacher, A. To be Published