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N cap The term N cap (N-cap, Ncap) describes an amino acid in a particular position within a protein or polypeptide. The N cap residue of an alpha helix is the first amino acid residue at the N terminus of the helix. More precisely, it is defined as the first residue (i) whose CO group is hydrogen-bonded to the NH group of residue i+4 (or sometimes residue i+3). Because of this it is sometimes also described as the residue prior to the helix. Capping motifs are those often found at the N cap. Asx turns, ST turns, asx motifs and ST turns are often found at such situations, with the asx or serine or threonine residue at the N cap. The C cap is the corresponding amino acid residue at the other end of the helix ==References== 〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「N cap」の詳細全文を読む
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