Staphylococcus epidermidis agr quorum-sensing system: Signal identification, cross talk, and importance in colonization

Michael E. Olson, Daniel A. Todd, Carolyn R. Schaeffer, Alexandra E. Paharik, Michael J. Van Dyke, Henning Bu¨ttner, Paul M. Dunman, Holger Rohde, Nadja B. Cech, Paul D Fey, Alexander R. Horswill

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Staphylococcus epidermidis is an opportunistic pathogen that is one of the leading causes of medical device infections. Global regulators like the agr quorum-sensing system in this pathogen have received a limited amount of attention, leaving important questions unanswered. There are three agr types in S. epidermidis strains, but only one of the autoinducing peptide (AIP) signals has been identified (AIP-I), and cross talk between agr systems has not been tested. We structurally characterized all three AIP types using mass spectrometry and discovered that the AIP-II and AIP-III signals are 12 residues in length, making them the largest staphylococcal AIPs identified to date. S. epidermidis agr reporter strains were developed for each system, and we determined that cross-inhibitory interactions occur between the agr type I and II systems and between the agr type I and III systems. In contrast, no cross talk was observed between the type II and III systems. To further understand the outputs of the S. epidermidis agr system, an RNAIII mutant was constructed, and microarray studies revealed that exoenzymes (Ecp protease and Geh lipase) and low-molecular-weight toxins were downregulated in the mutant. Follow-up analysis of Ecp confirmed the RNAIII is required to induce protease activity and that agr cross talk modulates Ecp activity in a manner that mirrors the agr reporter results. Finally, we demonstrated that the agr system enhances skin colonization by S. epidermidis using a porcine model. This work expands our knowledge of S. epidermidis agr system function and will aid future studies on cell-cell communication in this important opportunistic pathogen.

Original languageEnglish (US)
Pages (from-to)3482-3493
Number of pages12
JournalJournal of bacteriology
Volume196
Issue number19
DOIs
StatePublished - Jan 1 2014

Fingerprint

Quorum Sensing
Staphylococcus epidermidis
Protein Sorting Signals
Peptides
Peptide Hydrolases
Lipase
Cell Communication
Mass Spectrometry
Swine
Down-Regulation
Molecular Weight
Equipment and Supplies
Skin
Infection

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

Cite this

Olson, M. E., Todd, D. A., Schaeffer, C. R., Paharik, A. E., Van Dyke, M. J., Bu¨ttner, H., ... Horswill, A. R. (2014). Staphylococcus epidermidis agr quorum-sensing system: Signal identification, cross talk, and importance in colonization. Journal of bacteriology, 196(19), 3482-3493. https://doi.org/10.1128/JB.01882-14

Staphylococcus epidermidis agr quorum-sensing system : Signal identification, cross talk, and importance in colonization. / Olson, Michael E.; Todd, Daniel A.; Schaeffer, Carolyn R.; Paharik, Alexandra E.; Van Dyke, Michael J.; Bu¨ttner, Henning; Dunman, Paul M.; Rohde, Holger; Cech, Nadja B.; Fey, Paul D; Horswill, Alexander R.

In: Journal of bacteriology, Vol. 196, No. 19, 01.01.2014, p. 3482-3493.

Research output: Contribution to journalArticle

Olson, ME, Todd, DA, Schaeffer, CR, Paharik, AE, Van Dyke, MJ, Bu¨ttner, H, Dunman, PM, Rohde, H, Cech, NB, Fey, PD & Horswill, AR 2014, 'Staphylococcus epidermidis agr quorum-sensing system: Signal identification, cross talk, and importance in colonization', Journal of bacteriology, vol. 196, no. 19, pp. 3482-3493. https://doi.org/10.1128/JB.01882-14
Olson, Michael E. ; Todd, Daniel A. ; Schaeffer, Carolyn R. ; Paharik, Alexandra E. ; Van Dyke, Michael J. ; Bu¨ttner, Henning ; Dunman, Paul M. ; Rohde, Holger ; Cech, Nadja B. ; Fey, Paul D ; Horswill, Alexander R. / Staphylococcus epidermidis agr quorum-sensing system : Signal identification, cross talk, and importance in colonization. In: Journal of bacteriology. 2014 ; Vol. 196, No. 19. pp. 3482-3493.
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AU - Van Dyke, Michael J.

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