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CPdock: the complementarity plot for docking of proteins: implementing multi-dielectric continuum electrostatics.

Abstract：

:The complementarity plot (CP) is an established validation tool for protein structures, applicable to both globular proteins (folding) as well as protein-protein complexes (binding). It computes the shape and electrostatic complementarities (Sm, Em) for amino acid side-chains buried within the protein interior or interface and plots them in a two-dimensional plot having knowledge-based probabilistic quality estimates for the residues as well as for the whole structure. The current report essentially presents an upgraded version of the plot with the implementation of the advanced multi-dielectric functionality (as in Delphi version 6.2 or higher) in the computation of electrostatic complementarity to make the validation tool physico-chemically more realistic. The two methods (single- and multi-dielectric) agree decently in their resultant Em values, and hence, provisions for both methods have been kept in the software suite. So to speak, the global electrostatic balance within a well-folded protein and/or a well-packed interface seems only marginally perturbed by the choice of different internal dielectric values. However, both from theoretical as well as practical grounds, the more advanced multi-dielectric version of the plot is certainly recommended for potentially producing more reliable results. The report also presents a new methodology and a variant plot, namely CPdock, based on the same principles of complementarity specifically designed to be used in the docking of proteins. The efficacy of the method to discriminate between good and bad docked protein complexes has been tested on a recent state-of-the-art docking benchmark. The results unambiguously indicate that CPdock can indeed be effective in the initial screening phase of a docking scoring pipeline before going into more sophisticated and computationally expensive scoring functions. CPdock has been made available at https://github.com/nemo8130/CPdock . Graphical Abstract An example showing the efficacy of CPdock to be used in the initial screening phase of a protein-protein docking scoring pipeline.

journal_name

J Mol Model

journal_title

Journal of molecular modeling

authors

Basu S

doi

10.1007/s00894-017-3546-y

subject

Has Abstract

pub_date

2017-12-07 00:00:00

pages

8

issue

1

eissn

1610-2940

issn

0948-5023

pii

10.1007/s00894-017-3546-y

journal_volume

24

pub_type

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