The Korean Journal of Mycology (한국균학회지)

The Korean Society of Mycology (한국균학회)
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The COP9 Signalosome Network in Eukaryotic Microorganisms

진핵 미생물에서의 COP9 signalosome의 역할

  • Cheon, Yeongmi (Department of Microbiology and Molecular Biology, Chungnam National University) ;
  • Lee, Soojin (Department of Microbiology and Molecular Biology, Chungnam National University)
  • 천영미 (충남대학교 생명시스템과학대학 미생물.분자생명과학과) ;
  • 이수진 (충남대학교 생명시스템과학대학 미생물.분자생명과학과)
  • Received : 2013.02.04
  • Accepted : 2013.03.08
  • Published : 2013.03.31
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Abstract

COP9 signalosome (CSN), which is originally identified as the regulator of the photomorphogenic development in plant, is highly conserved protein complex in diverse eukaryotic organisms. Most eukaryotic CSN complex is composed of 8 subunits, which is structurally and functionally similar to the lid subunit of 26S proteasome and eIF3 translation initiation complex. CSN play important functions in the regulation of cell cycle and checkpoint response by controlling Cullin-Ring E3 ubiquitin ligases (CRL) activities. CSN exhibits an isopeptidase activity which cleaves the neddylated moiety of cullin components. In fission yeast, S-phase cell cycle progression was delayed and the sensitivity to g-ray or UV was increased in CSN1 and CSN2 deletion mutants, indicating that yeast CSN is also involved in the checkpoint regulation. CSN in fungal system more closely resembles that of the higher organisms in the structure and assembly of their components. Functionally, CSN is associated with the regulation of conidiation rhythms in Neurospora crassa and the sexual development in Aspsergillus nidulans. Recent studies also revealed that CSN functions as an essential cell cycle regulator, playing key roles in the regulation of DNA replication and DNA damage response in Aspergillus. Overall, CSN of microorganisms, such as fission yeast and fungi, share functionally common aspects with higher organisms, implying that they can be useful tools to study the role of CSN in the CRL-mediated diverse cellular activities.

Cop9 signalosome(CSN)은 최초 식물 발달 과정에서의 빛에 의한 전사 조절 과정에서의 억제 유전자로 처음 분리된 이후 이들이 다양한 진핵 생물 에서 매우 잘 보존되어 있음이 알려지게 되었다. 이들은 대부분 8개의 subunit으로 구성되며 26S proteasome lid와 eIF3와 구조적으로는 물론 기능적으로도 유사성을 보인다고 알려져 있다. 이들은 특히 Cullin-Ring ubiquitin ligases(CRL)의 구성 요소인 Cullin의 deneddylation을 매개하여 ubiquitin ligase의 활성을 조절한다고 알려져 있으며, 또한 세포 주기 및 checkpoint 조절에 관여한다고 보고되었다. 분열효모의 경우 CSN1 및 CSN2 결손 세포에서 S-phase로서의 진행이 지연됨이 관찰되었고 감마선 혹은 UV에 좀더 민감해지는 현상이 관찰되어 CSN이 checkpoint 조절에 관여한다는 것을 보여주었다. 곰팡이의 CSN 경우 구조적으로 더욱 상위 개체들의 그것과 더욱 유사한데, CSN이 생체 시계 리듬, 빛과 연관한 호르몬 생산, 곰팡이의 발달 과정 및 생식 주기를 조절함이 보고되었다. 또한 Aspergillus nidulans의 경우 상위개체에서 보여준 DNA 합성 및 손상, 세포 주기 조절에서의 기능이 알려지면서 CSN은 곰팡이 생활사에 필수적인 여러 과정들을 조절하는 중요한 인자임을 알 수 있다. 이로써 식물이나 포유동물 등에서 보고되었던 CSN의 주요 기능을 미생물에서도 대부분 공유하고 있음을 알 수 있고 이들이 CRL을 통한 주요 세포 활성 조절 연구에 좋은 툴로서 활용할 수 있음을 시사하고 있다.

Keywords

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