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C cap
The term C cap (C-cap, Ccap) describes an amino acid in a particular position within a protein or polypeptide. The C cap residue of an alpha helix is the last amino acid residue at the C terminus of the helix. More precisely, it is defined as the last residue (i) whose NH group is hydrogen-bonded to the CO group of residue i-4 (or sometimes residue i-3). Because of this it is sometimes also described as the residue following the helix.
Certain motifs occur commonly at or around the C cap, notably the Schellman loop and the niche (protein structural motif).
The N cap is the corresponding amino acid residue at the other end of the helix
==References==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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