Figure 4 (a) Structure of the -lactamase (BETA)--lactamase inhibitor (BLIP) complex. BETA is in blue and BLIP is in yellow. (b) Structure of the ROP four-helix bundle structure. The asymmetric unit is shown in red and crystallographically related molecules are shown in white. Together, they form two four-helix bundles. The search model was a 26-residue polyalanine helix. (c) The 15 molecules in the asymmetric unit for the V antibody fibre. The molecules form a continuous fibre along the 64 axis in the crystals (space group P6422). (d) The AP2 complex of four proteins. The subunit (a superhelix of -helices) is shown in red, the 2 subunit in blue (a similar superhelix of helices), the 2 subunit in cyan (mixed -helix/-sheet structure) and the 2 subunit in magenta (which consists of an N-terminal domain structurally homologous to the 2 subunit and a larger C-terminal mixed -helix/-sheet structure).

© International Union of Crystallography 2007