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Figure 5.
Figure 5. Superpositionings of the higher-resolution
structures at the DNA binding site. In both views the
backgrounded DNA molecule is that of form IV, and the ion-pair
formed between Asp114 and Arg116 in form IV is shown with black
dashes. Both views also show smaller bonds and atoms for the
dual conformations of Tyr64 of form IV. Superpositionings were
done using the same subset of alpha-carbon atoms listed for
Figure 2. (a) The superpositioning of the A and B protein
molecules of form I onto that of form IV. The main-chains and
side-chains nearly superimpose with the exception of the
main-chain of the form I B molecule in the region of Tyr64. (b)
Superpositioning of the A and B protein molecules of form IIa
onto that of form IV. The main and side-chain superpositionings
are nearly identical for the residues shown, and there is an
exact mapping of the Asp114 side-chain of the form IIa A
molecule and that of form IV.
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