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Assessment of Compositional Relatedness between Proteins

Abstract

IT is sometimes desirable to study the possible relationship of two proteins when sequence data are unavailable. Few methods are useful for such an analysis: molecular size, functional criteria, genetic localization, end group analysis, tryptic fingerprints all have serious shortcomings. Immunological criteria may be useful when cross-reactivity is found, but such cross-reactivity is frequently one of the earliest common features to be lost. A possible useful criterion is amino-acid composition. Despite considerable changes in protein structure brought about by a limited number of sequence changes, the overall composition of evolutionary related proteins can be expected to remain quite similar. We wish to present a simple method for assessing and describing such compositional relatedness.

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METZGER, H., SHAPIRO, M., MOSIMANN, J. et al. Assessment of Compositional Relatedness between Proteins. Nature 219, 1166–1168 (1968). https://doi.org/10.1038/2191166a0

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