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© Pierre Gounon
Entrée de Listeria dans une cellule épithéliale (Grossissement X 10000). Image colorisée.
Publication : The Journal of infectious diseases

OatA, a peptidoglycan O-acetyltransferase involved in Listeria monocytogenes immune escape, is critical for virulence

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of infectious diseases - 01 Sep 2011

Aubry C, Goulard C, Nahori MA, Cayet N, Decalf J, Sachse M, Boneca IG, Cossart P, Dussurget O

Link to Pubmed [PMID] – 21844299

J. Infect. Dis. 2011 Sep;204(5):731-40

Microbial pathogens have evolved mechanisms to overcome immune responses and successfully infect their host. Here, we studied how Listeria monocytogenes evades immune detection by peptidoglycan (PGN) modification. By analyzing L. monocytogenes muropeptides, we detected O-acetylated muramic acid residues. We identified an O-acetyltransferase gene, oatA, in the L. monocytogenes genome sequence. Comparison of PGN from parental and isogenic oatA mutant strains showed that the O-acetyltransferase OatA O-acetylates Listeria PGN. We also found that PGN O-acetylation confers resistance to different types of antimicrobial compounds targeting bacterial cell wall such as lysozyme, β-lactam antibiotics, and bacteriocins and that O-acetylation is required for Listeria growth in macrophages. Moreover, oatA mutant virulence is drastically affected in mice following intravenous or oral inoculation. In addition, the oatA mutant induced early secretion of proinflammatory cytokines and chemokines in vivo. These results suggest an important role for OatA in limiting innate immune responses and promoting bacterial survival in the infected host.

http://www.ncbi.nlm.nih.gov/pubmed/21844299