Tight Turns in Proteins
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Polypeptides often exhibit folded conformations in which the chain reverses its direction over a few residues. Many proteins contain such sequences. In addition to proteins, such conformations have been found in oligopeptide hormones (see Chapter 9) and antibiotics, such as gramicidin SA. Reverse turns, also called tight turns, together with helices and beta sheets, elements of the secondary structure of proteins, control their tertiary structure by their variations. The tight turns are the most prevalent type of nonrepetitive structure recognized. As opposed to helices and beta structures, which have the property that successive residues feature similar φ and ψ angles, the nonrepetitive fragments of structure have different φ and ψ angles for each residue, so the residue position within the structure influences it more than in a repetitive structure (1).
KeywordsDihedral Angle Stability Order Tobacco Necrosis Virus Beta Structure Beta Turn
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