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Figure 3.
Figure 3 Dimerization interface involving the  -arm.
Shown are the contacts made by the -arm
(colored yellow) from one subunit to its dimer pair (colored
blue). Only part of the -arm
is shown for clarity. Labeled are those residues making dimer
contacts, and these include Phe83 and Phe101, which stack
against the N-terminus of A2', Tyr96 which is sandwiched between
Arg46' and Arg53', and Thr90 which makes hydrogen bonds to the
carbonyls of Pro231' and Gly232'. Also shown is Leu92, which
encloses the active site of the other monomer. Enzyme-bound
uracil and phosphate are displayed and colored by atom type,
whereby red is oxygen, blue is nitrogen, gray is carbon, and
magenta is phosphorous.
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