Cytochromes C2 sequence variation among the recognised species of purple nonsulphur photosynthetic bacteria

Abstract

IN higher organisms, the nature and amount of amino acid sequence difference between homologous proteins from different species correlates well with what is known about the phylogeny of the organisms from morphological and palaeon-tological evidence1–3. We are interested in the application of amino acid sequence information to the study of bacterial phylogeny, a subject that is not amenable to investigation by the classical methods because of the paucity of morphological features and the lack of a palaeontological record. We have, therefore, determined the amino acid sequences of the principal soluble cytochromes c of representatives of each recognised species of the Rhodospirillaceae, the nonsulphur purple photosynthetic bacteria. In contrast to higher organisms, there was no correlation between a species' cytochrome c amino acid sequence and its phylogenetic position.

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AMBLER, R., DANIEL, M., HERMOSO, J. et al. Cytochromes C2 sequence variation among the recognised species of purple nonsulphur photosynthetic bacteria. Nature 278, 659–660 (1979). https://doi.org/10.1038/278659a0

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