The beta bend ribbon, or beta-bend ribbon, is a structural feature in polypeptides and proteins. The shortest possible has six amino acid residues (numbered i to i+5) arranged as two overlapping hydrogen bonded beta turns in which the carbonyl group of residue i is hydrogen-bonded to the NH of residue i+3 while the carbonyl group of residue i+2 is hydrogen-bonded to the NH of residue i+5.
The beta bend ribbon, or beta-bend ribbon, is a structural feature in polypeptides and proteins. The shortest possible has six amino acid residues (numbered i to i+5) arranged as two overlapping hydrogen bonded beta turns in which the carbonyl group of residue i is hydrogen-bonded to the NH of residue i+3 while the carbonyl group of residue i+2 is hydrogen-bonded to the NH of residue i+5.
Source: Wikipedia "Beta bend ribbon" · CC BY-SA 4.0
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