Figure 1. Gene arrangement of the R. centenum che₃ cluster and domain organizations of CheA₃, CheS₃, and CheY₃.

Arrow length is proportional to gene length. Abbreviations: REC, receiver domain; PAS, Per, Arnt, Sim domains; HWE_HK, HWE superfamily of histidine kinases; Hpt, histidine phosphotransfer domain; CA, catalytic and ATP-binding domain. Conserved histidine and aspartate residues as putative phosphorylation sites are denoted for each protein. The start and end amino acid positions of the receiver domains as well as those of the full proteins are also labeled according to the prediction by SMART [48].