Analysis and prediction of DNA-binding proteins and their binding residues based on composition, sequence and structural information - PubMed (original) (raw)

Comparative Study

. 2004 Mar 1;20(4):477-86.

doi: 10.1093/bioinformatics/btg432. Epub 2004 Jan 22.

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Comparative Study

Analysis and prediction of DNA-binding proteins and their binding residues based on composition, sequence and structural information

Shandar Ahmad et al. Bioinformatics. 2004.

Abstract

Motivation: Though vitally important to cell function, the mechanism of protein-DNA binding has not yet been completely understood. We therefore analysed the relationship between DNA binding and protein sequence composition, solvent accessibility and secondary structure. Using non-redundant databases of transcription factors and protein-DNA complexes, neural network models were developed to utilize the information present in this relationship to predict DNA-binding proteins and their binding residues.

Results: Sequence composition was found to provide sufficient information to predict the probability of its binding to DNA with nearly 69% sensitivity at 64% accuracy for the considered proteins; sequence neighbourhood and solvent accessibility information were sufficient to make binding site predictions with 40% sensitivity at 79% accuracy. Detailed analysis of binding residues shows that some three- and five-residue segments frequently bind to DNA and that solvent accessibility plays a major role in binding. Although, binding behaviour was not associated with any particular secondary structure, there were interesting exceptions at the residue level. Over-representation of some residues in the binding sites was largely lost at the total sequence level, but a different kind of compositional preference was observed in DNA-binding proteins.

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