Computational models of ChpT bound to its cognate RR domains. A. Schematic of the CckA-ChpT-CtrA-CpdR signaling pathway. B. Interaction site sequence conservation logos throughout alphaproteobacteria for ChpT, CckA-RD, CtrA, and CpdR. C. Stereoview of homology models of CckA (blue), CtrA (yellow), or CpdR (magenta) docked onto ChpT (green). D. Close-up views of the ChpT DHp-RR binding interface. Potential residues likely involved in binding are drawn as sticks and labeled.