A heterodimeric cytochrome c complex with a very low redox potential from an anaerobic ammonium-oxidizing enrichment culture.

A dimeric cytochrome c with an apparent molecular mass of 25 kDa was isolated from an anammox bacterium, strain KSU-1, in a relatively large quantity. This protein was named the NaxLS complex. The spectrum of the oxidized form exhibited a peculiar Soret peak at 419 nm.