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Figure 3.
Figure 3. F[o]–F[c] difference map of (a) p- and (b) n-side
binding site of TDS in the b[6]f complex. (a) p-side. The extra
density within H-bond distance of the His129 ligand of the
[2Fe-2S] cluster and between the ef and cd1 loops is attributed
to the chromone ring of TDS. As in Figure 2(a), the
origin of the electron density under the cd2 loop, presumably
lipid and/or detergent, is not known. (b) n-side. The position
of TDS is shown relative to heme c[n], which is exposed to the
quinone-exchange cavity. TDS is on the side of heme c[n] distal
to heme b[n]. TM helices and surface helices within loops
labeled as in Figure 2. F[o]–F[c] maps contoured at 4 σ.
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