人类INO80复合体对核体和六体的识别和重塑
Priyanka Aggarwal1, Manmohan Sharma1, Stephan Woike1
1Gene Center, Department of Biochemistry, Ludwig-Maximilians-Universität München, Feodor-Lynen-Str. 25, 81377 Munich, Germany.
Nucleic acids research
|March 3, 2026
概括
人类INO80重塑器滑动六体体,类似于核体. 结构研究揭示了其拓驱动的机制,用于重塑各种染色质基板.
科学领域:
- 分子生物学分子生物学
- 染色体生物学 染色体生物学
- 结构生物学 结构生物学
背景情况:
- INO80复合体是一种依赖ATP的染色体重塑剂.
- 它在基因调节元件和复制起源的染色质塑造中发挥着至关重要的作用.
- 以前的研究表明,酵母和真菌INO80可以滑动六体体,但这在人类中没有得到证实.
研究的目的:
- 为了研究人类INO80是否能结合和滑动六体体.
- 阐明人类INO80染色体重塑活动的结构和机制基础.
- 了解INO80如何与不同的核体和六体基质相互作用.
主要方法:
- 确定人体INO80与正规核体,H2A.Z核体和六体体结合的结构.
- 使用结构生物学技术可视化INO80-DNA和INO80-蛋白相互作用.
- 分析INO80子单元IES2在基板识别和滑动中的功能作用.
主要成果:
- 人类INO80有效地滑动六体体,与其在H2A和H2A.Z核细胞体上的活性相当.
- 结构分析显示,INO80感知核细胞拓,其位置取决于DNA解.
- INO80在核体和六体上表现出不同的结合位置,由与核体外DNA和酸性补丁的相互作用驱动.
结论:
- 人类INO80通过拓驱动机制重塑各种染色质基质,包括六体体.
- INO80复合物利用DNA解封和亚单元相互作用来区分和重塑各种染色体结构.
- 这些发现为INO80在染色体调节中的功能提供了关键的结构和机制见解.
相关概念视频
02:10The Nucleosome Core Particle
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
02:54Nucleosome Remodeling
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
02:32Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:32Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
01:32Chromatin Modification in iPS Cells
Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
01:12The Nucleosome Core Particle
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...