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Proteolitic digestion of nitrite reductase from Pseudomonas aeruginosa allows to obtain and purify a domain containing only the d1 heme and constituted by two noncovalently bound peptides. This d1 domain catayzes oxygen consumption, and binds carbon monoxide with a kinetic constant slightly higher than the parental dimeric holoenzyme. The capacity to oxidize the physiological substrate, cytochrome c551, is lost, even when the proteolytic c heme domain is added to this reaction mixture. This finding suggests that the two domains do not have a significant affinity for each other, and are kept together only by being part of the same polypeptide.
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