Members of this family adopt a secondary structure consisting of an open-face beta/alpha sandwich, with four antiparallel beta-strands and two alpha-helices. They bind to a corresponding domain on CheY, with subsequent phosphorylation of the CheY Asp57 residue, and activation of CheY, which then affects flagellar rotation.
Jiyao W et al.(2023). "The conserved domain database in 2023.",