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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+Pathog
2016 ; 12
(9
): e1005857
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English Wikipedia
Staphylococcus aureus Exploits a Non-ribosomal Cyclic Dipeptide to Modulate
Survival within Epithelial Cells and Phagocytes
#MMPMID27632173
Blättner S
; Das S
; Paprotka K
; Eilers U
; Krischke M
; Kretschmer D
; Remmele CW
; Dittrich M
; Müller T
; Schuelein-Voelk C
; Hertlein T
; Mueller MJ
; Huettel B
; Reinhardt R
; Ohlsen K
; Rudel T
; Fraunholz MJ
PLoS Pathog
2016[Sep]; 12
(9
): e1005857
PMID27632173
show ga
Community-acquired (CA) Staphylococcus aureus cause various diseases even in
healthy individuals. Enhanced virulence of CA-strains is partly attributed to
increased production of toxins such as phenol-soluble modulins (PSM). The
pathogen is internalized efficiently by mammalian host cells and intracellular S.
aureus has recently been shown to contribute to disease. Upon internalization,
cytotoxic S. aureus strains can disrupt phagosomal membranes and kill host cells
in a PSM-dependent manner. However, PSM are not sufficient for these processes.
Here we screened for factors required for intracellular S. aureus virulence. We
infected escape reporter host cells with strains from an established transposon
mutant library and detected phagosomal escape rates using automated microscopy.
We thereby, among other factors, identified a non-ribosomal peptide synthetase
(NRPS) to be required for efficient phagosomal escape and intracellular survival
of S. aureus as well as induction of host cell death. By genetic complementation
as well as supplementation with the synthetic NRPS product, the cyclic dipeptide
phevalin, wild-type phenotypes were restored. We further demonstrate that the
NRPS is contributing to virulence in a mouse pneumonia model. Together, our data
illustrate a hitherto unrecognized function of the S. aureus NRPS and its
dipeptide product during S. aureus infection.