Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Histone H3K27 Modifications and Gene Transcription

히스톤 H3K27 변형과 유전자 전사

  • Kim, Ae-Ri (Department of Molecular Biology, College of Natural Sciences, Pusan National University)
  • 김애리 (부산대학교 자연과학대학 분자생물학과)
  • Received : 2011.01.26
  • Accepted : 2011.02.23
  • Published : 2011.04.30
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Abstract

Lysine residues of histone H3 and H4 are covalently modified in the chromatin of eukaryotic cells. Lysine 27 in histone H3 was acetylated (H3K27ac) or methylated at three levels; mono-, di-, and trimethylation (H3K27me1, H3K27me2, and H3K27me3). These modifications at H3K27 were related with gene transcription and/or chromatin structure in distinct patterns. Generally, H3K27ac and H3K27me1 were enriched in active chromatin, such as the locus control region or transcriptionally active genes, while transcriptionally inactive genes were highly marked by H3K27me2 and H3K27me3. These modifications appear to have been catalyzed by distinct histone-modifying enzymes. Recent studies suggest that the four kinds of modifications at H3K27 have inter-correlation in gene transcription or chromatin structure formation.

진핵세포의 크로마틴에서 히스톤 단백질 H3와 H4의 라이신 잔기는 공유결합에 의해 변형된다. 히스톤 H3에서 27번 라이신은 아세틸화되거나(H3K27ac) 세 가지 단계로 메틸화가 될 수 있으며(H3K27me1, H3K27me2, H3K27me3), 이러한 H3K27의 변형들은 각각 독특한 형태로 유전자 전사 및 크로마틴 구조와 관련된다. 일반적으로 H3K27ac과 H3K27me1은 좌위조절부위나 활발히 전사되는 유전자처럼 활성 크로마틴에서 나타나고, 이에 반해 전사가 일어나지 않은 유전자는 높은 수준의 H3K27me2과 H3K27me3이 관찰된다. 이러한 변형들은 각각 다른 종류의 변형효소에 의해 촉매된다. 최근 연구들은 유전자 전사 및 크로마틴 구조 형성에서 H3K27의 네 가지 변형들 사이에 상관 관계가 있음을 제시하고 있다.

Keywords

References

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