Abstract
Short peptides connectingα-helices andβ-strands have been analyzed in 240 proteins refined at resolutions of 0.25 nm or better. Connecting peptides of lengths between one and five residues have been classified as part of supersecondary motifs of four types:αα, αβ, βα, andββ. Careful consideration has been given to the definition of secondary structures on the basis of hydrogen bonds and main-chain conformational angles. Using five classes of residue conformation—a, b, e, l, t—in the nonregular structure regions ofϕ, ψ space, 34 classes of supersecondary motifs occurring at least five times have been identified. Among these 34 classes, 11 classes that occur more than 25 times are commonly occurring supersecondary structure motifs. The patterns and conformations of the 11 commonly occurring supersecondary structure motifs have been characterized, demonstrating that patterns and conformations adopted by supersecondary structure motifs are limited. The results have relevance to structure prediction, comparative modeling, and protein folding.
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Sun, Z., Jiang, B. Patterns and conformations of commonly occurring supersecondary structures (basic motifs) in protein data bank. J Protein Chem 15, 675–690 (1996). https://doi.org/10.1007/BF01886750
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DOI: https://doi.org/10.1007/BF01886750