Reaction: a quinone + selenite + H2O = a quinol + selenate
Other name(s): srdA (gene name); srdB (gene name); srdC (gene name)
Systematic name: quinone:selenite oxidoreductase
Comments: The enzyme, characterized from the bacterium Mesobacillus selenatarsenatis, is a membrane anchored type I molybdoenzyme. The enzyme is a complex comprising three heterologous subunits that contains a guanylyl molybdenum cofactor and multiple iron-sulfur clusters. The enzyme receives electrons directly from the membrane quinol pool and reduces selenate to selenite.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:
References:
1. Ridley, H., Watts, C.A., Richardson, D.J. and Butler, C.S. Resolution of distinct membrane-bound enzymes from Enterobacter cloacae SLD1a-1 that are responsible for selective reduction of nitrate and selenate oxyanions. Appl. Environ. Microbiol. 72 (2006) 5173-5180. [PMID: 16885262]
2. Ma, J., Kobayashi, D.Y. and Yee, N. Role of menaquinone biosynthesis genes in selenate reduction by Enterobacter cloacae SLD1a-1 and Escherichia coli K12. Environ. Microbiol. 11 (2009) 149-158. [PMID: 18811645]
3. Kuroda, M., Yamashita, M., Miwa, E., Imao, K., Fujimoto, N., Ono, H., Nagano, K., Sei, K. and Ike, M. Molecular cloning and characterization of the srdBCA operon, encoding the respiratory selenate reductase complex, from the selenate-reducing bacterium Bacillus selenatarsenatis SF-1. J. Bacteriol. 193 (2011) 2141-2148. [PMID: 21357486]