Staphylococcus epidermidis agr quorum-sensing system
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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; Büttner, Henning; Dunman, Paul M; Rohde, Holger; Cech, Nadja B; Fey, Paul D; Horswill, Alexander R.
in: J BACTERIOL, Jahrgang 196, Nr. 19, 01.10.2014, S. 3482-93.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Staphylococcus epidermidis agr quorum-sensing system
T2 - signal identification, cross talk, and importance in colonization
AU - Olson, Michael E
AU - Todd, Daniel A
AU - Schaeffer, Carolyn R
AU - Paharik, Alexandra E
AU - Van Dyke, Michael J
AU - Büttner, Henning
AU - Dunman, Paul M
AU - Rohde, Holger
AU - Cech, Nadja B
AU - Fey, Paul D
AU - Horswill, Alexander R
N1 - Copyright © 2014, American Society for Microbiology. All Rights Reserved.
PY - 2014/10/1
Y1 - 2014/10/1
N2 - 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.
AB - 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.
KW - Animals
KW - Bacterial Proteins
KW - Gene Expression Regulation, Bacterial
KW - Humans
KW - Peptides, Cyclic
KW - Quorum Sensing
KW - Staphylococcal Infections
KW - Staphylococcus epidermidis
KW - Swine
U2 - 10.1128/JB.01882-14
DO - 10.1128/JB.01882-14
M3 - SCORING: Journal article
C2 - 25070736
VL - 196
SP - 3482
EP - 3493
JO - J BACTERIOL
JF - J BACTERIOL
SN - 0021-9193
IS - 19
ER -