This article includes a
Because the relationship between
In proteins, a structural motif describes the connectivity between secondary structural elements. An individual motif usually consists of only a few elements, e.g., the 'helix-turn-helix' motif which has just three. Note that, while the spatial sequence of elements may be identical in all instances of a motif, they may be encoded in any order within the underlying
Extremely common. Two
Two beta strands folded over into a sandwich shape.
A loop in which the residues that make up the beginning and end of the loop are very close together.
Two beta strands with an alpha helix end folded over to bind a zinc
Two α helices joined by a short strand of amino acids and found in many proteins that regulate gene expression.
Extremely common. Three consecutive amino acid residues form an anion-binding concavity.
Extremely common. Three or four consecutive amino acid residues form a cation-binding feature.