Biosynthesis of vitamin b2 (riboflavin).

Abstract:

:The biosynthesis of one riboflavin molecule requires one molecule of GTP and two molecules of ribulose 5-phosphate as substrates. The imidazole ring of GTP is hydrolytically opened, yielding a 4, 5-diaminopyrimidine which is converted to 5-amino-6-ribitylamino-2, 4(1H,3H)-pyrimidinedione by a sequence of deamination, side chain reduction and dephosphorylation. Condensation of 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione with 3, 4-dihydroxy-2-butanone 4-phosphate obtained from ribulose 5-phosphate affords 6,7-dimethyl-8-ribityllumazine. Dismutation of the lumazine derivative yields riboflavin and 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione, which is recycled in the biosynthetic pathway. The structure of the biosynthetic enzyme, 6,7-dimethyl-8-ribityllumazine synthase, has been studied in considerable detail.

journal_name

Annu Rev Nutr

authors

Bacher A,Eberhardt S,Fischer M,Kis K,Richter G

doi

10.1146/annurev.nutr.20.1.153

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

153-67

eissn

0199-9885

issn

1545-4312

pii

20/1/153

journal_volume

20

pub_type

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