K. Ehlert et al., Site-specific serine incorporation by Lif and Epr into positions 3 and 5 of the staphylococcal peptidoglycan interpeptide bridge, J BACT, 182(9), 2000, pp. 2635-2638
The FemAB-like factors Lif and Epr confer resistance to glycylglycine endop
eptidases lysostaphin and Ale-1, respectively, by incorporating serine resi
dues into the staphylococcal peptidoglycan interpeptide bridges specificall
y at positions 3 and 5. This required the presence of FemA and/or FemB, in
contrast to earlier postulations.