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Superpositions of aligned structures of BC from Aquifex aeolicus (1ULZ, light colors) and ACC in E. coli (1DV2, dark colors) (a) Superposition based on 339 Cα-atoms belonging to the first rigid body (in blue). The closure of domain B onto domains A and C is clearly visible. (b) Superposition based on 42 Cα-atoms belonging to the second rigid body (in green). The movement of the helix on top of the B domain (red) with respect to the rest of the B domain (green) becomes visible.
