BRWD3促进KDM5的降解,以保持H3K4甲基化水平
Dongsheng Han1, Samantha H Schaffner1, Jonathan P Davies1
1Department of Biological Sciences, Vanderbilt University, Nashville, TN 37212.
概括
代和WD重复含有蛋白3 (BRWD3) 通过控制KDM5的降解来调节基因组甲基化,该酶可消除H3K4甲基化标记. 这一发现揭示了维护染色体结构和基因表达平衡的新机制.
科学领域:
- 表观遗传学和基因调控
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 基因突变对染色质结构和基因表达至关重要.
- 这些修饰的失调与癌症等疾病有关.
- 控制特定基因素标记的精确机制,如H3K4甲基化,尚未完全理解.
研究的目的:
- 阐明BRWD3 (odomain和WD重复含有蛋白3) 影响H3K4甲基化水平的机制.
- 为了研究BRWD3与参与H3K4甲基化中的酶之间的相互作用.
- 确定BRWD3在调节H3K4-修饰酶的稳定性和活性方面的作用.
主要方法:
- BRWD3的耗尽和H3K4me1和H3K4me3水平的分析.
- 免疫沉与定量质谱相结合,以确定蛋白质相互作用.
- 染色体免疫沉测序 (ChIP-seq) 用于评估基因组的局部化.
- 对KDM5无处不在和降解途径的分析.
主要成果:
- BRWD3的枯竭会改变H3K4me1和H3K4me3的水平,这表明它在H3K4甲基化中的作用更广泛.
- BRWD3与KDM5 (氨酸脱甲基酶5) 相互作用,这种酶可以去除H3K4甲基化痕迹.
- BRWD3通过依赖Cul4.4的K48结合的多基化促进KDM5的降解.
- 减少KDM5可以挽救BRWD3减少引起的H3K4甲基化变化.
结论:
- BRWD3作为KDM5活动的调节者,控制其降解.
- 这种BRWD3的调节对于保持平衡的H3K4甲基化水平至关重要.
- BRWD3-KDM5轴代表了一种影响染色体状态和基因表达的新机制.
相关概念视频
Spreading of Chromatin Modifications
8.3K
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...
8.3K
Heterochromatin
13.9K
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...
13.9K
Euchromatin
7.0K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
7.0K
Chromatin Modification in iPS Cells
1.7K
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...
1.7K
Histone Modification
13.4K
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...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
13.4K
Position-effect Variegation
6.4K
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
6.4K


