doi: 10.1007/BF01732214.
Linear and inverted repetitions in protein sequences
- PMID: 1202227
- DOI: 10.1007/BF01732214
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Linear and inverted repetitions in protein sequences
J Mol Evol.
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Abstract
An extensive search for internal regularities in amino acid sequences has been made, using both the genetic code and the relative frequencies of amino acid alternatives in homologous proteins. The two methods give very similar results and strongly suggest the occurrence of significant linear and inverted repetitions (similar sequences of opposite polarity) in several proteins. A hypothesis is developed to explain the occurrence of such internal regularities in proteins. This hypothesis is based on a process of duplication of an ancestral loop in which a symmetrical arrangement of amino acid allows stabilization by interaction between the amino acid side chains.
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