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Figure 7.
Fig. 7. Intersubunit bridges B2a and B4. (A) Minor-groove
interactions between H69 and h44 and h45, broken down by region.
Atoms within hydrogen-bonding distance, as mentioned in the
text, are connected by dashed lines. (B) Molecular interactions
in bridge B4. Protein S15 in the 30S subunit is in blue, with
relevant side chains in green. The interaction is viewed from
the left side of Fig. 5A (left) and from the right side of Fig.
5A (right). Electron density is visible for the side chain of
Arg88 (R88) in ribosome II, but not in ribosome I. Other amino
acid abbreviations: I, Ile; L, Leu; V, Val; A, Ala; Q, Gln.
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