Identification of Position-Specific Correlations between DNA-Binding Domains and Their Binding Sites. Application to the MerR Family of Transcription Factors.
The large and increasing volume of genomic data analyzed by comparative methods provides information about transcription factors and their binding sites that, in turn, enables statistical analysis of correlations between factors and sites, uncovering mechanisms and evolution of specific protein-DNA recognition. Here we present an online tool, Prot-DNA-Korr, designed to identify and analyze crucial protein-DNA pairs of positions in a family of transcription factors. Correlations are identified by analysis of mutual information between columns of protein and DNA alignments. The algorithm reduces the effects of common phylogenetic history and of abundance of closely related proteins and binding sites. We apply it to five closely related subfamilies of the MerR family of bacterial transcription factors that regulate heavy metal resistance systems. We validate the approach using known 3D structures of MerR-family proteins in complexes with their cognate DNA binding sites and demonstrate that a significant fraction of correlated positions indeed form specific side-chain-to-base contacts. The joint distribution of amino acids and nucleotides hence may be used to predict changes of specificity for point mutations in transcription factors.
A.A. Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, 19-1 Bolshoy Karetny pereulok, Moscow, Russia, 127994.|Department of Bioengineering and Bioinformatics, Moscow State University, 1-73 Vorobievy Gory, Moscow, Russia, 119991.
Yuriy D
YD
Korostelev
A.A. Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, 19-1 Bolshoy Karetny pereulok, Moscow, Russia, 127994.
Ilya A
IA
Zharov
A.A. Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, 19-1 Bolshoy Karetny pereulok, Moscow, Russia, 127994.|Department of Bioengineering and Bioinformatics, Moscow State University, 1-73 Vorobievy Gory, Moscow, Russia, 119991.
Andrey A
AA
Mironov
A.A. Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, 19-1 Bolshoy Karetny pereulok, Moscow, Russia, 127994.
Alexandra B
AB
Rakhmaininova
A.A. Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, 19-1 Bolshoy Karetny pereulok, Moscow, Russia, 127994.|Department of Bioengineering and Bioinformatics, Moscow State University, 1-73 Vorobievy Gory, Moscow, Russia, 119991.
Mikhail S
MS
Gelfand
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