Asx Turn

Motif Glossary

Asx Turn


A motif of three consecutive residues and one H-bond in which there is:

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These encompass the following conformations for each of Asp and Asn:


Duddy and Milner-White, Protein Sci. 13:3051-3055 (2004)


1. The Asx Turn, like the ST Turn, resembles the H-bonded Beta Turn in the sense that side-chain atoms of residue-1 mimic the main-chain of residue-1 of Beta Turns.

2. The previous definition of subcategories specified subsections of the βR region at residue-1. The current definition in terms of the χ1 angle of the side-chain is more intuitive, although its effect is the same as the old definition.