It is now ~50 years since the discovery of the atomic structure of the α-helix by Linus Pauling. Like the other great helical structure in biology, the double helix of B-DNA, it was ultimately ...

The structure then terminates with α–helix 4 (residues 129–138) which is capped at its C-terminal end by hydrogen bonds. The two sheets in the protein combine to form a β–sandwich that is ...