Beta bend ribbon

A beta bend ribbon can be regarded as an aberrant 310 helix (3/10-helix) that has lost some of its hydrogen bonds.

Type I beta-bend ribbons regularly occur in leucine-rich repeats, in the environments sometimes occupied by helices.

A protein with a stack of these features is the extracellular ligand-binding domain of the Nogo receptor.

[13] Another beta bend ribbon occurs in the GTPase-activating protein for Rho in the active, but not the inactive, form of the enzyme.

[14] Polypeptides consisting of repeats of the dipeptide (α-amino-γ-lactam plus a conventional amino acid) have been shown to adopt a beta bend ribbon conformation.

A beta bend ribbon with 12 alanine residues. Colors of atoms: carbon, green; oxygen red; nitrogen blue. The four dashed lines are hydrogen bonds, each of which defines a beta turn .