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박테리아의 Quorum Sensing 및 생물막 형성 억제를 위한 Quorum Quenching 연구 동향

Bacterial Quorum Sensing and Quorum Quenching for the Inhibition of Biofilm Formation

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한국미생물·생명공학회 (The Korean Society For Microbiology And Biotechnology)|2012.06|한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)|제40권 제2호|pp. 83-91|DOI http://dx.doi.org/10.4014/kjmb.1205.05011

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참고문헌

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biofilmbiofoulingQuorum sensingquorum quenchingautoinducerAHL-lactonase
주제분류생물학

초록

본 총설은 N-acyl-homoserine lactone (AHL)에 기반한quorum sensing(QS)을 비롯한 다양한 QS 시스템 및 생물막형성과의 관련성에 대한 연구 동향을 정리하였다. 또한 anti-QS으로서 quorum quenching 전략을 이용한 생물막 억제 연구 동향에 대해 중점적으로 서술하였다. 세균의 독특한 신호전달 체계인 QS는 AHL과 같은 특정한 신호분자의 농도 에 의해 세균의 집단적 행동 양식이 결정되는 세포밀도-의존성 유전자 발현 조절 메커니즘이다. QS 시스템은 미생물의 부착 및 생물막 형성에 있어 중요한 역할을 한다. AI-1이나 AI-2에 의한 QS는 생물막 형성 과정에 필요한 세포외다당류, 단백질, 세포 외 DNA 등 주요한 구성 성분 등의 생산뿐만 아니라, 세균의 운동성 조절, 부착, 생물막 해체 과정 까지도 조절하는 기능을 한다. 일부 세균의 경우 QS시스템 이외에도 second messenger로 알려진 c-di-GMP에 의한signaling이 QS와 서로 연결되어 생물막 형성이나 병독성과같은 타깃들을 함께 조절한다. 생물막은 병원성 세균에 의한 감염 시 여러 가지 병독성 가운데 가장 중요한 요소 중하나이기 때문에, 생물막 형성을 조절하는 QS를 차단하기위한 다양한 anti-quorum sensing 전략이 연구되고 있다. Anti-QS 접근 방식은 의학적 이용뿐만 아니라 물에 노출되어있는 MBR을 비롯한 많은 산업적 장치 등에서 생물막 형성으로 인한 손상 및 오염을 방지하기 위해 쓰일 수 있다. Anti-QS 전략 중 신호분자인 AHL을 무력화 시키는 quorum quenching 효소(AHL-lactonase, AHL-acylase, oxidoreductas)를 이용하여 생물막 형성을 억제할 수 있으며, 막을 이용한수처리 공정에서 막에 발생하는 biofouling을 완화시킬 수있는 새로운 anti-fouling 처리 기술로서 이러한 QQ 효소의적용 가능성을 보여 주고 있다.

Abstract

Quorum sensing (QS) is a cell-to-cell communication system, which is used by many bacteria to regulate diverse gene expression in response to changes in population density. Bacteria recognize the differences in cell density by sensing the concentration of signal molecules such as N-acyl-homoserine lactones (AHL)and autoinducer-2 (AI-2). In particular, QS plays a key role in biofilm formation, which is a specific bacterial group behavior. Biofilms are dense aggregates of packed microbial communities that grow on surfaces, and are embedded in a self-produced matrix of extracellular polymeric substances (EPS). QS regulates biofilm dispersal as well as the production of EPS. In some bacteria, biofilm formations are regulated by c-di-GMPmediated signaling as well as QS, thus the two signaling systems are mutually connected. Biofilms are one of the major virulence factors in pathogenic bacteria. In addition, they cause numerous problems in industrial fields, such as the biofouling of pipes, tanks and membrane bioreactors (MBR). Therefore, the interference of QS, referred to as quorum quenching (QQ) has received a great deal of attention. To inhibit biofilm formation, several strategies to disrupt bacterial QS have been reported, and many enzymes which can degrade or modify the signal molecule AHL have been studied. QQ enzymes, such as AHL-lactonase, AHL-acylase, and oxidoreductases may offer great potential for the effective control of biofilm formation and membrane biofouling in the future. This review describes the process of bacterial QS, biofilm formation, and the close relationship between them. Finally, QQ enzymes and their applications for the reduction of biofouling are also discussed. Keywords: Quorum sensing, quorum quenching, autoinducer, biofilm, biofouling, AHL-lactonase

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