ⓘ C cap. The term C cap 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 ac ..

                                     

ⓘ C cap

The term C cap 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 whose NH group is hydrogen-bonded to the CO group of residue i-4. 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

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