Journal Article

Quality assessment of protein model-structures using evolutionary conservation

Matan Kalman and Nir Ben-Tal

in Bioinformatics

Volume 26, issue 10, pages 1299-1307
Published in print May 2010 | ISSN: 1367-4803
Published online April 2010 | e-ISSN: 1460-2059 | DOI:

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Motivation: Programs that evaluate the quality of a protein structural model are important both for validating the structure determination procedure and for guiding the model-building process. Such programs are based on properties of native structures that are generally not expected for faulty models. One such property, which is rarely used for automatic structure quality assessment, is the tendency for conserved residues to be located at the structural core and for variable residues to be located at the surface.

Results: We present ConQuass, a novel quality assessment program based on the consistency between the model structure and the protein's conservation pattern. We show that it can identify problematic structural models, and that the scores it assigns to the server models in CASP8 correlate with the similarity of the models to the native structure. We also show that when the conservation information is reliable, the method's performance is comparable and complementary to that of the other single-structure quality assessment methods that participated in CASP8 and that do not use additional structural information from homologs.

Availability: A perl implementation of the method, as well as the various perl and R scripts used for the analysis are available at


Supplementary information: Supplementary data are available at Bioinformatics online.

Journal Article.  7496 words.  Illustrated.

Subjects: Bioinformatics and Computational Biology

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