Abstract

Cytochromes c have been purified from four insect trypanosomatids: Trypanosoma cruzi, cruzi, T. rhodesiense, Crithidia fasciculata and Leptomonas sp. All four cytochromes c have similar spectral properties, with the α-peak of the reduced form between 555–558 nm. Their electrophoretic and molecular weight properties are similar. The cytochromes c are less basic than most mammalian-type cytochromes c. The amino acid compositions of the four cytochromes c are similar but not identical. All have ε- N-trimethyllysine present. The properties of trypanosomatid cytochromes c are significantly different from other basic mammalian-type cytochromes c but similar to yeast cytochromes c.

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