FIG. 7.
Crystal packing showing three MsrAMtb molecules related by the crystallographic twofold screw axis parallel to the c-axis of the unit cell. Each molecule is presented as a Cα backbone trace surrounded by a transparent rendering of its molecular surface. The N termini containing the Met-1 residue that interacts with the active site of their neighboring molecules are circled. The crystal lattice is composed of continuous chains of this packing pattern extending in the vertical direction of the graphic. This figure was generated using PyMOL (version 0.86; DeLano Scientific, San Carlos, Calif.; http://www.pymol.org).