Figure 3
Schematic drawing of ClpX. The monomeric ATPase domain of ClpX is represented as a piece of the hexagonal casket at the bottom. The monomeric N-terminal ZBD is a cylinder at the top. Each ZBD monomer contains a binding site for the SspB tail based on the crystal structure. Therefore, the purple-coloured pairs are all possible functional ZBD units for efficient delivery of ssrA-tagged substrates by SspB adaptor protein (a)–(d). |