Accurate Prediction of Peptide Binding Sites on Protein Surfaces

被引:131
作者
Petsalaki, Evangelia [1 ]
Stark, Alexander [1 ]
Garcia-Urdiales, Eduardo [1 ]
Russell, Robert B. [1 ]
机构
[1] European Mol Biol Lab, Heidelberg, Germany
基金
奥地利科学基金会;
关键词
INTERACTION NETWORKS; 3-DIMENSIONAL PROFILES; SYSTEMATIC DISCOVERY; FUNCTIONAL SITES; STRUCTURAL BASIS; LINEAR MOTIFS; PIWI PROTEIN; DOMAIN; RECOGNITION; MECHANISM;
D O I
10.1371/journal.pcbi.1000335
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Many important protein-protein interactions are mediated by the binding of a short peptide stretch in one protein to a large globular segment in another. Recent efforts have provided hundreds of examples of new peptides binding to proteins for which a three-dimensional structure is available (either known experimentally or readily modeled) but where no structure of the protein-peptide complex is known. To address this gap, we present an approach that can accurately predict peptide binding sites on protein surfaces. For peptides known to bind a particular protein, the method predicts binding sites with great accuracy, and the specificity of the approach means that it can also be used to predict whether or not a putative or predicted peptide partner will bind. We used known protein-peptide complexes to derive preferences, in the form of spatial position specific scoring matrices, which describe the binding-site environment in globular proteins for each type of amino acid in bound peptides. We then scan the surface of a putative binding protein for sites for each of the amino acids present in a peptide partner and search for combinations of high-scoring amino acid sites that satisfy constraints deduced from the peptide sequence. The method performed well in a benchmark and largely agreed with experimental data mapping binding sites for several recently discovered interactions mediated by peptides, including RG-rich proteins with SMN domains, Epstein-Barr virus LMP1 with TRADD domains, DBC1 with Sir2, and the Ago hook with Argonaute PIWI domain. The method, and associated statistics, is an excellent tool for predicting and studying binding sites for newly discovered peptides mediating critical events in biology.
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页数:10
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