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beta bulge
A beta bulge can be described as a localized disruption of the regular hydrogen bonding of beta sheet by inserting extra residues into one or both hydrogen bonded β-strands.
==Types==
β-bulges can be grouped according to their length of the disruption, the number of residues inserted into each strand, whether the disrupted β-strands are parallel or antiparallel and by their dihedral angles (which controls the placement of their side chains). Two types occur commonly. One, the ''classic beta bulge'', occurs within, or at the edge of, antiparallel beta-sheet; the residue at the outwards bulge has the αR, as opposed to the β, conformation.
The other type is the ''beta bulge loop'' (also named type G1 β-bulge), often occurs in association with an antiparallel sheet, but also in other situations. One residue has the αL conformation and is part of a beta turn or alpha turn, such that the motif sometimes forms the loop of a beta hairpin.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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