Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Regulation of gene expression by histone-like proteins in bacteria

박테리아의 히스톤 유사 단백질에 의한 유전자 발현 조절

  • Park, Shinae (Department of Molecular Bioscience, College of Biomedical Science, Kangwon National University) ;
  • Lee, Jung-Shin (Department of Molecular Bioscience, College of Biomedical Science, Kangwon National University)
  • 박신애 (강원대학교 분자생명과학과) ;
  • 이정신 (강원대학교 분자생명과학과)
  • Received : 2018.02.06
  • Accepted : 2018.03.08
  • Published : 2018.03.31
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Abstract

A prokaryotic cell has various histone-like proteins also known as nucleoid-associated proteins (NAPs). These proteins bind AT-rich sequence at DNA, which induce DNA wrapping, bending, and bridging, and subsequently regulate the gene expression in bacteria. Because NAPs function in transcriptional silencing of virulence genes, it is important to study their roles in gene silencing and specific mechanisms of these proteins. In this review, we discussed two well-known NAPs, H-NS, and HU, and summarized their roles for gene expression in Escherichia coli and Salmonella Typhimurium. Through the oligomerization and filamentation of H-NS, it represses the expression of virulence genes in human pathogenic bacteria, such as Salmonella Typhimurium, and it works with other NAPs positively or negatively. Recently, H-NS also regulates typhoid toxin expression, which causes typhoid fever and systemic disease in human. Additionally, HU regulates the expression of genes related to both virulence and physiology of Salmonella. Therefore, we suggest that NAPs like H-NS and HU are crucial factors to reveal the molecular mechanisms of virulence gene expression in bacteria.

원핵 세포는 핵양체 결합 단백질(NAP)로 알려진 다양한 히스톤 유사 단백질을 가지고 있다. 이들은 DNA의 AT-rich 서열에 결합하여, DNA 자체를 감싸거나, 구부리거나, 떨어져 있는 DNA 가닥을 연결시키는 다리 역할을 하여, 결국에는 원핵 생물의 유전자 발현을 조절한다. NAP는 특히 전사의 억제 기능을 가지고 있기 때문에, 유전자 발현 억제에 있어서 이들의 역할과, 구체적인 메커니즘을 밝히는 것을 매우 중요한 일이다. 본 논문에서는 잘 알려져 있는 NAP인 H-NS와 HU에 대하여 정리하였고, 특히 E. coli와 Salmonella Typhimurium에서 이들의 유전자 발현에 대한 기능을 요약하였다. H-NS는 이들의 올리고머화와 필라멘트 구조 형성을 통하여 Salmonella와 같은 사람에 감염하는 병원성 세균의 독성유전자 발현을 억제할 수 있고, 이런 기능을 수행하였을 때 다른 NAP와 함께 작용할 수 있다. 최근에 H-NS는 사람에게 typhoid fever와 systemic disease를 발생시키는 독성물질인, typhoid toxin의 발현 또한 조절할 수 있음이 밝혀졌다. Salmonella에서 HU 또한 독성 유전자뿐만 아니라, 이들의 생리적 기능에 중요한 유전자들의 발현을 조절할 수 있다. 따라서, H-NS와 HU와 같은 NAP들이 원핵 생물의 독성 유전자 발현의 분자적인 메커니즘을 밝히는데 중요한 요소임을 제시한다.

Keywords

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