Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Regulation of Activity of the Response Regulator RssB

Response Regulator RssB의 활성 조절

  • Park, Hee Jeong (Department of Microbiology and Immunology, Chosun University School of Dentistry) ;
  • Bang, Iel Soo (Department of Microbiology and Immunology, Chosun University School of Dentistry)
  • 박희정 (조선대학교 치의학전문대학원 미생물학 및 면역학 교실) ;
  • 방일수 (조선대학교 치의학전문대학원 미생물학 및 면역학 교실)
  • Received : 2013.09.04
  • Accepted : 2013.09.23
  • Published : 2013.09.30
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Abstract

Against environmental stresses, many bacteria utilize the alternate sigma factor RpoS that induces transcription of the specific set of genes helpful in promoting bacterial survival. Intracellular levels of RpoS are determined mainly by its turnover through proteolysis of ClpXP protease. Delivery of RpoS to ClpXP strictly requires the adaptor protein RssB. The two-component-type response regulator RssB constantly interacts with RpoS, but diverse environmental changes inhibit this interaction through modification of RssB activity, which increases RpoS levels in bacteria. This review discusses and summarizes recent findings on regulatory factors in RssB-RpoS interactions, including IraD, IraM, IraP anti-adaptor proteins of RssB and phosphorylation of N-terminal receiver domain of RssB. New information shows that the coordinated regulation of RssB activity in controlling RpoS turnover confers efficient bacterial defense against stresses.

많은 세균들은 환경적 스트레스에 대항하기 위해 세균 생존에 유용한 특정 유전자들의 전사를 유도하는 대체시그마 인자 RpoS를 활용한다. 세포 내 RpoS 단백질의 농도는 주로 ClpXP 단백질 분해효소의 조절을 통해 결정된다. RpoS를 ClpXP로 전달하기 위해서는 adaptor 단백질 RssB가 반드시 필요하다. Two-component-type response regulator RssB는 RpoS와 지속적으로 상호작용을 하지만, 다양한 환경변화에 의해 RssB-RpoS 상호작용이 억제되어 세균에서 RpoS 양을 증가시킨다. 본 총설에서는 최근까지 연구 된 RssB-RpoS 상호작용에 관여하는 RssB의 anti-adaptor 단백질 IraD, IraM, IraP 등의 조절인자들과 RssB의 N-terminal 수용체 도메인의 인산화에 대해 설명하고 요약하였다. 이러한 RssB의 정교한 활성을 통한 RpoS 분해조절 과정은 외부환경 스트레스로부터 보다 효율적으로 세균을 보호할 수 있다.

Keywords

References

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