Abstract
Data on the amino acid composition of proteins having various functions from organisms representing different evolutionary levels (83 superfamilies) are used in order to elucidate the trends in protein molecular evolution. The interconnections evolutionary rate (rate of mutation acceptance) — amino acid composition, and evolutionary level of the organism — amino acid composition (in case of proteins of the same or very similar function) are studied. The amino acid compositions of proteins performing jointly an evolutionarily old functions are also juxtaposed. The mean contemporary protein composition is used as a basis for comparison. The obtained results are evidence in favour of the existence of a trend for an increase of the special amino acids (Met, Ile, Gln, His, Lys, Asn, Phe, Tyr, Trp, Cys) at the expense of the usual ones (Thr, Pro, Ala, Ser, Arg, Gly, Leu, Val, Glu, Asp). The tests of statistical significance of the obtained results (comparison of the mean compositions of proteins from low evolutionary level organisms with that of all sequenced proteins; comparison of the mean contemporary protein composition with that obtained after simulation of the evolutionary process) confirm and universalize the observed trend. The above results direct the attention to the concept of a smaller number of amino acids in the ancient proteins and respectively simpler genetic code. A fluctuation around the initial primitive level is suggested to explain the conservatism of proteins of the same function in evolutionarily low level organisms. The observed trend could be applied for designing new proteins.
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Ivanov, O.C. On the trends in protein molecular evolution: Amino acid composition. Origins Life Evol Biosphere 19, 187–198 (1989). https://doi.org/10.1007/BF01808152
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DOI: https://doi.org/10.1007/BF01808152