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Figure 1.
Figure 1. Structural model of protein Y binding to the ribosome
as determined by X-ray crystallography. (a) Location of PY
density in the 70S ribosome. The 30S subunit is gold, the 50S
subunit is light blue, positive difference electron density is
blue, negative density is red, and PY is cyan. Helix 69 of 23S
rRNA is marked with an asterisk. (b) PY density in the 30S
subunit as seen from the perspective of the subunit interface,
indicated by the arrow in a. The density occurs between the
platform (P) and the head (H) of the 30S subunit. The A, P and E
sites, and the body (B) of the small subunit are marked. (c)
Details of the docking of the N-terminal core of PY (PDB entry
1L4S 3) into the difference electron density. The position of
the disordered C-terminal tail is indicated. The view is from
the perspective of the arrow in b.
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