Asx turn
Feature in proteins and polypeptides / From Wikipedia, the free encyclopedia
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The Asx turn[1][2][3][4][5][6][7] is a structural feature in proteins and polypeptides. It consists of three amino acid residues (labeled i, i+1 and i+2) in which residue i is an aspartate (Asp) or asparagine (Asn) that forms a hydrogen bond from its sidechain CO group to the mainchain NH group of residue i+2. About 14% of Asx residues present in proteins belong to Asx turns.
The name "Asx" is used here to represent either of the amino acids aspartate (Asp) or asparagine (Asn).