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• W2053281575 startingPage "1325" @default.
• W2053281575 abstract "Structurally similar but sequentially unrelated proteins have been discovered and rediscovered by many researchers, using a variety of structure comparison tools. For several pairs of such proteins, existing structural alignments obtained from the literature, as well as alignments prepared using several different similarity criteria, are compared with each other. It is shown that, in general, they differ from each other, with differences increasing with diminishing sequence similarity. Differences are particularly strong between alignments optimizing global similarity measures, such as RMS deviation between C alpha atoms, and alignments focusing on more local features, such as packing or interaction pattern similarity. Simply speaking, by putting emphasis on different aspects of structure, different structural alignments show the unquestionable similarity in a different way. With differences between various alignments extending to a point where they can differ at all positions, analysis of structural similarities leads to contradictory results reported by groups using different alignment techniques. The problem of uniqueness and stability of structural alignments is further studied with the help of visualization of the suboptimal alignments. It is shown that alignments are often degenerate and whole families of alignments can be generated with almost the same score as the optimal alignment. However, for some similarity criteria, specially those based on side-chain positions, rather than C alpha positions, alignments in some areas of the protein are unique. This opens the question of how and if the structural alignments can be used as standards of truth for protein comparison." @default.
• W2053281575 created "2016-06-24" @default.
• W2053281575 creator A5010671148 @default.
• W2053281575 date "1996-07-01" @default.
• W2053281575 modified "2023-09-23" @default.
• W2053281575 title "The structural alignment between two proteins: Is there a unique answer?" @default.
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• W2053281575 doi "https://doi.org/10.1002/pro.5560050711" @default.
• W2053281575 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2143456" @default.
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