PMID: 9188741Jun 1, 1997Paper

Structural trees for protein superfamilies

Proteins
A V Efimov

Abstract

Structural trees for large protein superfamilies, such as beta proteins with the aligned beta sheet packing, beta proteins with the orthogonal packing of alpha helices, two-layer and three-layer alpha/beta proteins, have been constructed. The structural motifs having unique overall folds and a unique handedness are taken as root structures of the trees. The larger protein structures of each superfamily are obtained by a stepwise addition of alpha helices and/or beta strands to the corresponding root motif, taking into account a restricted set of rules inferred from known principles of the protein structure. Among these rules, prohibition of crossing connections, attention to handedness and compactness, and a requirement for alpha helices to be packed in alpha-helical layers and beta strands in beta layers are the most important. Proteins and domains whose structures can be obtained by stepwise addition of alpha helices and/or beta strands to the same root motif can be grouped into one structural class or a superfamily. Proteins and domains found within branches of a structural tree can be grouped into subclasses or subfamilies. Levels of structural similarity between different proteins can easily be observed by visual inspectio...Continue Reading

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Citations

Feb 28, 2003·Proceedings of the National Academy of Sciences of the United States of America·Jingtong HouSung-Hou Kim
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