Figure 1.

(a) View of one of the M. jannaschii complexes in the asymmetric unit (complex 1) looking down the noncrystallographic threefold. Each monomer is depicted in a different color. Both sulfates on the noncrystallographic threefold are shown. Arrows denote the noncrystallographic twofold axes. The catalytic chains C1, C2 and C3 comprise the top trimer of the complex, while the C4, C5 and C6 chains comprise the bottom subunit. (b) Side stereoview of the two M. jannaschii complexes in the present structure superimposed on each other. Complex 1 is shown in pink and complex 2 is shown in teal. The view is looking down the noncrystallographic twofold.