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Figure 1.
Fig. 1. Portions of the experimental 2.4 Å resolution
electron density map. (A) A stereo view of a junction between
23S rRNA domains II, III, IV, and V having a complex structure
that is clearly interpretable. The electron density is contoured
at 2  . The
bases are white and the backbones are colored by domain as
specified in Fig. 4. (B) The extended region of L3 interacting
with its surrounding RNA, where the red RNA density is contoured
at 2 and the
blue protein density is contoured at 1.5 . (C)
Detail in the L2 region showing a bound Mg2+ ion. (D) Detail
from L2 showing amino acid side chains. (E) Helices 94 through
97 from domain VI. The red contour level is at 2 , and the
yellow contour at 6 shows the
positions of the higher electron density phosphate groups.
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