FemAB_like is a family of both baterial and Viridiplantae proteins with responsibility for building interpeptide bridges in peptidoglycan. Such a function is feasible for bacteria but less likely for the plant members of this family. Perhaps the plant-members are using homologous proteins to recognize bacterial peptidoglcans as part of their innate immune system.
Lu S et al.(2020). "CDD/SPARCLE: the conserved domain database in 2020.",