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Protein Engineering, Vol. 14, No. 8, 549-555, August 2001
© 2001 Oxford University Press

Evaluation of a novel method for the identification of coevolving protein residues

Leighton Pritchard1,2, Peter Bladon1, Jane M. O. Mitchell3 and Mark J. Dufton1,4

1 Departments of Pure and Applied Chemistry 3 Statistics and Modelling Science, University of Strathclyde,295 Cathedral Street, Glasgow G1 1XL, UK 2 Present address: Cledwyn Building, Institute of Biological Sciences, University of Wales, Aberystwyth SY23 3DD, UK

A novel method for the identification of correlated pairs in aligned homologous protein sequences is presented and evaluated against a model of simulated protein evolution incorporating covariation. Our method is shown to be capable of identifying all coevolutionary pairs of sites, with minimal interference by background correlations, in aligned sequence sets containing ~60 sequences with a tree depth of at least 30 accepted point mutations. This result is expected even in the presence of a large degree of neutral and non-correlated evolution. It is postulated that, since naturally occurring protein families may be subject to stronger selection pressures and a lesser degree of neutral evolution, this method of covariation analysis may be generally more robust than the model would indicate.


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