IUBMB Enzyme Nomenclature


Accepted name: nicotinate dehydrogenase (cytochrome)

Reaction: nicotinate + a ferricytochrome + H2O = 6-hydroxynicotinate + a ferrocytochrome

Other name(s): nicotinic acid hydroxylase; nicotinate hydroxylase

Systematic name: nicotinate:cytochrome 6-oxidoreductase (hydroxylating)

Comments: This two-component enzyme from Pseudomonas belongs to the family of xanthine dehydrogenases, but differs from most other members of this family. While most members contain an FAD cofactor, the large subunit of this enzyme contains three c-type cytochromes, enabling it to interact with the electron transfer chain, probably by delivering the electrons to a cytochrome oxidase. The small subunit contains a typical molybdopterin cytosine dinucleotide(MCD) cofactor and two [2Fe-2S] clusters [1].

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Jimenez, J.I., Canales, A., Jimenez-Barbero, J., Ginalski, K., Rychlewski, L., Garcia, J.L. and Diaz, E. Deciphering the genetic determinants for aerobic nicotinic acid degradation: the nic cluster from Pseudomonas putida KT2440. Proc. Natl. Acad. Sci. USA 105 (2008) 11329-11334. [PMID: 18678916]

2. Yang, Y., Yuan, S., Chen, T., Ma, P., Shang, G. and Dai, Y. Cloning, heterologous expression, and functional characterization of the nicotinate dehydrogenase gene from Pseudomonas putida KT2440. Biodegradation 20 (2009) 541-549. [PMID: 19118407]

[EC created 2010]

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