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Figure 4.
Figure 4. The internal aldimine Lys209-PLP and the sulfate
ion in the active site. (a) Architecture of the active site
(stereo view). The main-chain traces of subunits A and B are
shown by light blue and light green tubes, respectively. The
internal aldimine Lys209-PLP (cyan) and the sulfate ion are
shown by ball and stick models. Hydrogen bonds are shown as pink
broken lines. (b) The |F[o]–F[c]| simulated-annealing omit
electron density maps (3.0σ) for Lys209-PLP and the sulfate ion
are shown in blue and green, respectively. (c) The |F[o]–F[c]|
simulated-annealing omit electron density maps (3.0σ) for
Lys209 and the sulfate ion are shown in blue and green,
respectively, in the active site of molecule B of the SeMet
SepCysS structure.
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