Staphylococcus aureus autoinducer-2 quorum sensing decreases biofilm formation in an icaR-dependent manner.
Staphylococcus aureus autoinducer-2 quorum sensing decreases biofilm formation in an icaR-dependent manner.
复制标题
金黄色葡萄球菌自诱导剂 2 群体感应以 icaR 依赖性方式减少生物膜形成
DOI:
10.1186/1471-2180-12-288
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发表时间:
2012-12-05
期刊:
影响因子:
4.2
通讯作者:
Sun B
中科院分区:
文献类型:
--
作者:
Yu D;Zhao L;Xue T;Sun B
Staphylococcus aureus is an important pathogen that causes biofilm-associated infection in humans. Autoinducer 2 (AI-2), a quorum-sensing (QS) signal for interspecies communication, has a wide range of regulatory functions in both Gram-positive and Gram-negative bacteria, but its exact role in biofilm formation in S. aureus remains unclear. Here we demonstrate that mutation of the AI-2 synthase gene luxS in S. aureus RN6390B results in increased biofilm formation compared with the wild-type (WT) strain under static, flowing and anaerobic conditions and in a mouse model. Addition of the chemically synthesized AI-2 precursor in the luxS mutation strain (ΔluxS) restored the WT phenotype. Real-time RT-PCR analysis showed that AI-2 activated the transcription of icaR, a repressor of the ica operon, and subsequently a decreased level of icaA transcription, which was presumably the main reason why luxS mutation influences biofilm formation. Furthermore, we compared the roles of the agr-mediated QS system and the LuxS/AI-2 QS system in the regulation of biofilm formation using the ΔluxS strain, RN6911 and the Δagr ΔluxS strain. Our data indicate a cumulative effect of the two QS systems on the regulation of biofilm formation in S. aureus. These findings demonstrate that AI-2 can decrease biofilm formation in S. aureus via an icaR-activation pathway. This study may provide clues for therapy in S. aureus biofilm-associated infection.
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影响因子:
4.4
作者:
Auger, S;Krin, E;Gohar, M
通讯作者:
Gohar, M
影响因子:
3.2
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影响因子:
3.1
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Smeltzer, MS
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3.2
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通讯作者:
Jefferson, Kimberly K.
影响因子:
3.1
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通讯作者:
Götz, F