Structure of coiled β‐β‐hairpins and β‐β‐corners

Two types of super‐secondary structure, coiled β‐β‐hairpins and β‐β‐corners, are considered in this paper. A β‐β‐corner can be represented as a long β‐β‐hairpin folded orthogonally on itself so that the strands, when passing from one layer to the other. rotate in a right‐handed direction about an imaginary axis. It is shown that a β‐β‐hairpin. forming a coiled coil structure or a β‐β‐corner, is right‐handed when viewed from the concave side. These unique arrangements of β‐strands in the coiled β‐β‐hairpins and β‐β‐corners are of particular value in protein modelling and prediction.