ON THE MONOHEME NATURE OF CYTOCHROME c ′ ( Rhodopseudomonas palustris )

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Abstract
The variant c-type cytochrome in R. palustris (strain #2. 1. 37) is a monoheme protein, differing from all other cytochromes-cc[image] in electrochemical potential, molecular weight, isoelectric point and the presence of a blocked amino terminal residue. It belongs to this class of variant cytochromes c on the basis that its spectroscopic properties and covalent binding of the prosthetic group are identical with those of other cytochromes-cc[image]. The possession of a single heme by this cytochrome-c[image] warrants its characterization as the 1st example of a cytochrome-c[image], and provides the 1st example of a monoheme protein in which a Soret band occurs with widely split components.