Using orthologous and paralogous proteins to identify specificity determining residues.

Abstract:

BACKGROUND:Concepts of orthology and paralogy are become increasingly important as whole-genome comparison allows their identification in complete genomes. Functional specificity of proteins is assumed to be conserved among orthologs and is different among paralogs. We used this assumption to identify residues which determine specificity of protein-DNA and protein-ligand recognition. Finding such residues is crucial for understanding mechanisms of molecular recognition and for rational protein and drug design. RESULTS:Assuming conservation of specificity among orthologs and different specificity of paralogs, we identify residues which correlate with this grouping by specificity. The method is taking advantage of complete genomes to find multiple orthologs and paralogs. The central part of this method is a procedure to compute statistical significance of the predictions. The procedure is based on a simple statistical model of protein evolution. When applied to a large family of bacterial transcription factors, our method identified 12 residues that are presumed to determine the protein-DNA and protein-ligand recognition specificity. Structural analysis of the proteins and available experimental results strongly support our predictions. Our results suggest new experiments aimed at rational re-design of specificity in bacterial transcription factors by a minimal number of mutations. CONCLUSIONS:While sets of orthologous and paralogous proteins can be easily derived from complete genomic sequences, our method can identify putative specificity determinants in such proteins.

journal_name

Genome Biol

journal_title

Genome biology

authors

Mirny LA,Gelfand MS

doi

10.1186/gb-2002-3-3-preprint0002

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

PREPRINT0002

issue

3

eissn

1474-7596

issn

1474-760X

journal_volume

3

pub_type

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