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The GASright dimerization motif. (a) The GASright motif is a right-handed helical dimer with a short interhelical distance (6.3–7.5 Å) and a right-handed crossing angle of approximately −40°. The GxxxG sequence pattern at the crossing point (red) allows the backbones to come into contact. (b) The contact enables formation of networks of weak interhelical H bonds between Cα–H donors and carbonyl oxygen acceptors (shown in detail in c).
