PLP catabolism: Identification of the 4-pyridoxic acid dehydrogenase gene in Mesorhizobium loti MAFF303099 Academic Article uri icon


  • The function of the mlr6793 gene from Mesorhizobium loti MAFF303099 has been identified. This gene encodes 4-pyridoxic acid dehydrogenase, an enzyme involved in the catabolism of PLP (Vitamin B6). This enzyme was overexpressed in Escherichia coli and characterized. 4-Pyridoxic acid dehydrogenase is a 33kDa protein that catalyzes the four electron oxidation of 4-pyridoxic acid to 3-hydroxy-2-methylpyridine-4,5-dicarboxylate, using nicotinamide adenine dinucleotide as a cofactor. The k cat for NADH production is 0.01s(-1). The KM values for 4-pyridoxic acid and NAD are 5.8 and 6.6microM, respectively.

author list (cited authors)

  • Mukherjee, T., Kinsland, C., & Begley, T. P.

citation count

  • 10

publication date

  • September 2007