Figure 1.
Ribbon diagram of the T. denitrificans APS kinase. (a) The asymmetric unit is shown looking down the noncrystallographic threefold axis. Chains A (yellow), B (teal) and C (aqua) comprise one half of the hexamer. The biologically relevant hexamer is created through crystallographic twofold symmetry. (b) The monomer is shown with its N-terminal sulfurylase-like domain colored green. The APS kinase functional domain is colored blue. The black dashed lines signify the two stretches of undefined electron density.