Abstract
The bacterial cell envelope protein TolA functions to maintain the integrity of the cell membrane. This protein contains high levels of alanine and lysine that are used in the formation of alpha helices, which are required for normal protein function. The neutral model of molecular evolution predicts that amino acid composition and nucleotide composition are driven by the underlying GC content, as a result of mutation bias. However, this study shows that selection has acted to maintain high levels of alanine and lysine in the TolA protein of Proteobacteria, which in turn has biased nucleotide composition in the corresponding tolA gene.
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Helpful comments were provided by C.P. Kurtzman, D.P. Labeda, T.J. Ward, J. Zhang, and two anonymous reviewers.
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Rooney, A.P. Selection for Highly Biased Amino Acid Frequency in the TolA Cell Envelope Protein of Proteobacteria . J Mol Evol 57, 731–736 (2003). https://doi.org/10.1007/s00239-003-2530-6
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DOI: https://doi.org/10.1007/s00239-003-2530-6