This protein appears to be a member of a somewhat larger structural family conserved in Firmicutes. It displays structural similarity to the N-terminal domain of YycH, which plays a role in signal transduction and is found immediately downstream of the essential histidine kinase YycG. YycG forms a two-component system together with its cognate response regulator YycF. YycH functions as a modulator of YycG activity, possibly by interacting with YchI. All three molecules (YchG, YchH, and YchI) have been characterized as membrane proteins, and they may be able to form homodimers.
Jiyao W et al.(2023). "The conserved domain database in 2023.",