Fig. 7.

Large 50S subunit and its exit tunnel. (A) Structure of the large 50S subunit in surface representation (green). (B) 50S subunit is depicted in surface representation with 30% transparency and its L2 protein is shown as blue surface without transparency serving as a point of orientation. The large subunit is rotated by 90° around the vertical axis from the left view. [PW₁₁O₃₉]⁷⁻ (W11) are shown as clusters of red spheres marking the approximate path of the polypeptide exit channel through the entire subunit.