ExplorEnz: EC 1.1.1.325

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1.1.1.325

Accepted name:

sepiapterin reductase (L-threo-7,8-dihydrobiopterin forming)

Reaction:

(1) L-threo-7,8-dihydrobiopterin + NADP⁺ = sepiapterin + NADPH + H⁺
(2) L-threo-tetrahydrobiopterin + 2 NADP⁺ = 6-pyruvoyl-5,6,7,8-tetrahydropterin + 2 NADPH + 2 H⁺

Glossary:

sepiapterin = 2-amino-6-lactoyl-7,8-dihydropteridin-4(3H)-one
tetrahydrobiopterin = 5,6,7,8-tetrahydrobiopterin = 2-amino-6-(1,2-dihydroxypropyl)-5,6,7,8-tetrahydropteridin-4(3H)-one

Systematic name:

L-threo-7,8-dihydrobiopterin:NADP⁺ oxidoreductase

Comments:

This enzyme, isolated from the bacterium Chlorobium tepidum, catalyses the final step in the de novo synthesis of tetrahydrobiopterin from GTP. cf. EC 1.1.1.153, sepiapterin reductase (L-erythro-7,8-dihydrobiopterin forming).

Links to other databases:

BRENDA, EXPASY, GTD, KEGG, MetaCyc, PDB, CAS registry number: 9059-48-7

References:

1.	Cho, S.H., Na, J.U., Youn, H., Hwang, C.S., Lee, C.H. and Kang, S.O. Sepiapterin reductase producing L-threo-dihydrobiopterin from Chlorobium tepidum. Biochem. J. 340 (1999) 497–503. [PMID: 10333495]
2.	Supangat, S., Choi, Y.K., Park, Y.S., Son, D., Han, C.D. and Lee, K.H. Expression, purification, crystallization and preliminary X-ray analysis of sepiapterin reductase from Chlorobium tepidum. Acta Crystallogr. Sect. F Struct. Biol. Cryst. Commun. 61 (2005) 202–204. [DOI] [PMID: 16510994]

[EC 1.1.1.325 created 2012]