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a)
Overall structure of the PcyA-BV
complex. The ribbon model is displayed
with the N-terminal side in blue
and the C-terminal side in red. The
BV molecule is shown as a stick model
with carbon, oxygen, and nitrogen
atoms in grey, red, and blue, respectively.
b)
Electrostatic potential of the
PcyA-BV complex. Positive and negative
surfaces are shown in blue and red,
respectively. BV is shown as stick
model.
c)
Close-up view of BV-binding site.
BV has a U-shape, permitting the
two reduction sites close to each
other. The central Asp residue may
change its side-chain conformation
in the serial reduction.
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