Recurring loop motif in proteins that occurs in right-handed and left-handed forms. Its relationship with alpha-helices and beta-bulge loops.


A common feature of alpha-helices in proteins is a loop at the C-terminal end, with a characteristic hydrogen bond pattern. It is noted that several loops with the same structural features occur independently of alpha-helices; two are even situated at the loop ends of beta-hairpins. The name paperclip is suggested for loops possessing the appropriate… (More)


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