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Evidence of Positive Darwinian Selection in Omp85, a Highly ConservedBacterial Outer Membrane Protein Essential for Cell Viability

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Abstract

Omp85 is a highly conserved outer membrane protein found in all gram-negative bacteria. It is essential for bacterial cell viability and plays an integral function in the positioning and folding of other outer membrane proteins into the bacterial outer membrane. We have employed a maximum likelihood and a maximum parsimony approach to detect evidence of positive Darwinian selection in Omp85 homologues from 10 δ-proteobacteria and have identified 14 amino acid sites that show evidence of being under the influence of adaptive evolution. Interestingly all sites bar one are concentrated within surface loops of the protein that most likely interact with host immune response or the surrounding environment. Alternatively amino acids within membrane-spanning regions of the protein are found to be under purifying selection most likely as a result of structural constraints.

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Authors and Affiliations

  1. Department of Biology, National University of Ireland, Maynooth, Country Kildare,, Ireland

    David A. Fitzpatrick & James O. McInerney

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  1. David A. Fitzpatrick
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  2. James O. McInerney
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Correspondence to James O. McInerney.

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Reviewing Editor: Dr. Siv Anderson

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Fitzpatrick, D.A., McInerney, J.O. Evidence of Positive Darwinian Selection in Omp85, a Highly ConservedBacterial Outer Membrane Protein Essential for Cell Viability. J Mol Evol 60, 268–273 (2005). https://doi.org/10.1007/s00239-004-0194-5

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  • DOI: https://doi.org/10.1007/s00239-004-0194-5

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