Reaction: L-idonate + NAD+ = 5-dehydro-D-gluconate + NADH + H+
Systematic name: L-idonate:NAD+ oxidoreductase
Comments: Involved in the catabolism of ascorbate (vitamin C) to tartrate. No activity is observed with NADP+ (cf. EC 188.8.131.524, L-idonate 5-dehydrogenase.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
1. DeBolt, S., Cook, D.R. and Ford, C.M. L-Tartaric acid synthesis from vitamin C in higher plants. Proc. Natl. Acad. Sci. USA 103 (2006) 5608-5613. [PMID: 16567629]