title: Defining the limits of homology modeling in information-driven protein docking.
abstract: Information-driven docking is currently one of the most successful approaches to obtain structural models of protein interactions as demonstrated in the latest round of CAPRI. While various experimental and computational techniques can be used to retrieve information about the binding mode, the availability of three-dimensional structures of the interacting partners remains a limiting factor. Fortunately, the wealth of structural information gathered by large-scale initiatives allows for homology-based modeling of a significant fraction of the protein universe. Defining the limits of information-driven docking based on such homology models is therefore highly relevant. Here we show, using previous CAPRI targets, that out of a variety of measures, the global sequence identity between template and target is a simple but reliable predictor of the achievable quality of the docking models. This indicates that a well-defined overall fold is critical for the interaction. Furthermore, the quality of the data at our disposal to characterize the interaction plays a determinant role in the success of the docking. Given reliable interface information we can obtain acceptable predictions even at low global sequence identity. These results, which define the boundaries between trustworthy and unreliable predictions, should guide both experts and nonexperts in defining the limits of what is achievable by docking. This is highly relevant considering that the fraction of the interactome amenable for docking is only bound to grow as the number of experimentally solved structures increases.
authors.affiliation: Faculty of Science/Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, 3584CH, The Netherlands.
authors.forename: J P G L M
authors.initials: JP
authors.lastname: Rodrigues
authors.forename: A S J
authors.initials: AS
authors.lastname: Melquiond
authors.forename: E
authors.initials: E
authors.lastname: Karaca
authors.forename: M
authors.initials: M
authors.lastname: Trellet
authors.forename: M
authors.initials: M
authors.lastname: van Dijk
authors.forename: G C P
authors.initials: GC
authors.lastname: van Zundert
authors.forename: C
authors.initials: C
authors.lastname: Schmitz
authors.forename: S J
authors.initials: SJ
authors.lastname: de Vries
authors.forename: A
authors.initials: A
authors.lastname: Bordogna
authors.forename: L
authors.initials: L
authors.lastname: Bonati
authors.forename: P L
authors.initials: PL
authors.lastname: Kastritis
authors.forename: Alexandre M J J
authors.initials: AM
authors.lastname: Bonvin
mesh_terms: D019295:Computational Biology; D030562:Databases, Protein; D008958:Models, Molecular; D062105:Molecular Docking Simulation; D011485:Protein Binding; D011487:Protein Conformation; D025941:Protein Interaction Mapping; D011506:Proteins / Q000737:chemistry*; D012984:Software
chemical_list: D011506:Proteins
keywords: CAPRI; HADDOCK; biomolecular complexes; comparative modeling; data-driven docking; proteins; structure quality