Structure similarity measure with penalty for close non-equivalent residues

TitleStructure similarity measure with penalty for close non-equivalent residues
Publication TypeJournal Article
Year of Publication2009
AuthorsSadreyev, R. I., Shi S. Y., Baker D., & Grishin N. V.
JournalBioinformatics
Volume25
Issue10
Pagination1259-63
Date Published2009 May 15
ISSN1367-4811
KeywordsCollaborative Publication, Computational Biology, Protein Conformation, Protein Folding, Proteins, Sequence Alignment, Sequence Analysis, Protein, Software, Structural Homology, Protein
Abstract

MOTIVATION: Recent improvement in homology-based structure modeling emphasizes the importance of sensitive evaluation measures that help identify and correct modest distortions in models compared with the target structures. Global Distance Test Total Score (GDT_TS), otherwise a very powerful and effective measure for model evaluation, is still insensitive to and can even reward such distortions, as observed for remote homology modeling in the latest CASP8 (Comparative Assessment of Structure Prediction). RESULTS: We develop a new measure that balances GDT_TS reward for the closeness of equivalent model and target residues ('attraction' term) with the penalty for the closeness of non-equivalent residues ('repulsion' term). Compared with GDT_TS, the resulting score, TR (total score with repulsion), is much more sensitive to structure compression both in real remote homologs and in CASP models. TR is correlated yet different from other measures of structure similarity. The largest difference from GDT_TS is observed in models of mid-range quality based on remote homology modeling. AVAILABILITY: The script for TR calculation is included in Supplementary Material. TR scores for all server models in CASP8 are available at http://prodata.swmed.edu/CASP8.

Alternate JournalBioinformatics
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