FIG 9.

A model for the interaction of Ffh domains with the E. coli 50S ribosomal subunit (Protein Data Bank [PDB] code 2AWB). The large-subunit rRNA (23S) is shown as a view from the ribosome exit tunnel (☆). Two of its helices are shown, h24 and h59. Large-subunit proteins are shown as a sphere presentation. A double line across the figure approximately separates the M and NG domain binding sites on the ribosome. This figure was created by the software program PyMol (DeLano Scientific LLC, San Carlos, CA [http://www.pymol.org/]).