Abo1 ATPase促进了FACT与染色质的分离
Juwon Jang1, Yujin Kang2, Martin Zofall3
1Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), KI for the BioCentury, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.
Nucleic acids research
|December 16, 2024
概括
基因组辅导体Abo1直接与FACT相互作用,以ATP依赖的方式促进其与核细胞分离. 这种相互作用对于维持酵母中异色素蛋白的完整性至关重要.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 染色体动力学 染色体动力学
背景情况:
- 在DNA过程中,FACT (促进染色体转录) 复合体对于核细胞的稳定性至关重要.
- 失去FACT功能会导致异常的转录和异色染色素缺陷.
- 阿博1 (Abo1) 是一种基因素陪伴剂,与FACT相互作用,但其具体作用尚不清楚.
研究的目的:
- 为了阐明Abo1在FACT函数中的确切作用.
- 为了研究Abo1-FACT相互作用的分子机制.
- 在体内确定Abo1-FACT相互作用的功能意义.
主要方法:
- 生物化学测定以确认Abo1和FACT之间的直接相互作用.
- 位点定向的突变发生,以确定相互作用区域.
- 单分子光成像用于观察FACT动态.
- 在裂变酵母中进行遗传分析.
主要成果:
- 通过其N端螺旋,Abo1直接与FACT的Spt16子单元结合.
- Abo1促进了FACT与核细胞的ATP依赖性解离.
- 在裂变酵母中,Abo1-FACT相互作用对于保持异色染色素是必不可少的.
结论:
- Abo1 作为核酶体上 FACT 周转的调节者.
- 这项研究提出了一种通过介于介管间相互作用的基因素辅助子循环的模型.
- Abo1的功能对于表观遗传调节和维持基因组稳定性至关重要.
相关概念视频
02:54Nucleosome Remodeling
9.0K
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...
9.0K
02:25Spreading of Chromatin Modifications
8.2K
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
Writers
The writer...
8.2K
02:35Transcription Elongation Factors
10.7K
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA...
10.7K
02:38Heterochromatin
10.8K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
10.8K
02:05Duplication of Chromatin Structure
5.4K
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
5.4K
02:15Condensins
3.4K
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
3.4K