YejM (LapC, PbgA) belongs to a regulatory system that controls the activity of LpxC, the enzyme that catalyzes the first committed step in the LPS synthesis. The earlier report (2015) by Dalebroux, et al (PMID: 25856753), which assigned a role in cardiolipin transport and introduced the name PbgA (phoPQ-barrier gene A), is no longer considered accurate.
Jiyao W et al.(2023). "The conserved domain database in 2023.",