Broad-spectrum antimicrobial peptide resistance by MprF-mediated aminoacylation and flipping of phospholipids
Article first published online: 1 MAR 2011
© 2011 Blackwell Publishing Ltd
Volume 80, Issue 2, pages 290–299, April 2011
How to Cite
Ernst, C. M. and Peschel, A. (2011), Broad-spectrum antimicrobial peptide resistance by MprF-mediated aminoacylation and flipping of phospholipids. Molecular Microbiology, 80: 290–299. doi: 10.1111/j.1365-2958.2011.07576.x
- Issue published online: 11 APR 2011
- Article first published online: 1 MAR 2011
- Accepted manuscript online: 9 FEB 2011 08:12PM EST
- Accepted 28 January, 2011.
Bacteria are frequently exposed to cationic antimicrobial peptides (CAMPs) from eukaryotic hosts (host defence peptides) or from prokaryotic competitors (bacteriocins). However, many bacteria, among them most of the major human pathogens, achieve CAMP resistance by MprF, a unique enzyme that modifies anionic phospholipids with l-lysine or l-alanine thereby introducing positive charges into the membrane surface and reducing the affinity for CAMPs. The lysyl or alanyl groups are derived from aminoacyl tRNAs and are usually transferred to phosphatidylglycerol (PG). Recent studies with MprF from Staphylococcus aureus demonstrated that production of Lys-PG only leads to CAMP resistance when an additional flippase domain of MprF is present that translocates Lys-PG and exposes it at the outer leaflet of the membrane. Thus, MprF exerts two specific functions that have hardly been found in other bacterial proteins. MprF proteins are crucial virulence factors of many human pathogens, which recommends them as targets for new anti-virulence drugs. Intriguingly, specific point mutations in mprF cause resistance to the CAMP-like antibiotic daptomycin in a yet unclear way that may involve altered Lys-PG synthesis and/or Lys-PG flipping capacities. Thus, a thorough characterization of MprF domains and functions will help to unravel how bacteria maintain and protect their cytoplasmic membranes.