Figure 1

(a) The overall structure of AceK-Mn2+. The active site of AceK includes a buried ADP molecule and a bound AMP at the interface of the two domains. The kinase domain (KD) on the left resembles eukaryotic protein kinases. The regulatory domain (RD) on the right does not have any structural homologues. Loop-β3αC is coloured pink. (b) Structural comparison of AceK with Mn2+ (pink) and Mg2+ (light yellow). The location of metal ions is indicated by a red arrow.