Alternative alignments from comparison of protein structures

Proteins
Edward S C Shih, Ming-Jing Hwang

Abstract

Comparison of two protein structures often results in not only a global alignment but also a number of distinct local alignments; the latter, referred to as alternative alignments, are however usually ignored in existing protein structure comparison analyses. Here, we used a novel method of protein structure comparison to extensively identify and characterize the alternative alignments obtained for structure pairs of a fold classification database. We showed that all alternative alignments can be classified into one of just a few types, and with which illustrated the potential of using alternative alignments to identify recurring protein substructures, including the internal structural repeats of a protein. Furthermore, we showed that among the alternative alignments obtained, permuted alignments, which included both circular and scrambled permutations, are as prevalent as topological alignments. These results demonstrated that the so far largely unattended alternative alignments of protein structures have implications and applications for research of protein classification and evolution.

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Citations

Mar 9, 2012·Bioinformatics·M I Sadowski, W R Taylor
Jul 18, 2006·Nucleic Acids Research·Edward S C ShihMing-Jing Hwang
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