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Molecular Biology and Evolution, Vol 16, 1696-1710, Copyright © 1999 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Using protein structural information in evolutionary inference: transmembrane proteins

P Lio and N Goldman
Department of Genetics, University of Cambridge, England.

We present a model of amino acid sequence evolution based on a hidden Markov model that extends to transmembrane proteins previous methods that incorporate protein structural information into phylogenetics. Our model aims to give a better understanding of processes of molecular evolution and to extract structural information from multiple alignments of transmembrane sequences and use such information to improve phylogenetic analyses. This should be of value in phylogenetic studies of transmembrane proteins: for example, mitochondrial proteins have acquired a special importance in phylogenetics and are mostly transmembrane proteins. The improvement in fit to example data sets of our new model relative to less complex models of amino acid sequence evolution is statistically tested. To further illustrate the potential utility of our method, phylogeny estimation is performed on primate CCR5 receptor sequences, sequences of l and m subunits of the light reaction center in purple bacteria, guinea pig sequences with respect to lagomorph and rodent sequences of calcitonin receptor and K- substance receptor, and cetacean sequences of cytochrome b.
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