ASH1L中的PHD-BAH域可以识别H3K4甲基化并调节胆瘤癌的恶性行为
1Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan, China.
Anti-cancer agents in medicinal chemistry
|July 22, 2024
概括
ASH1L的PHD-BAH域与H3K4me2结合,这对胆管癌细胞存活至关重要. 突变会破坏这种相互作用,通过PSMB基因调节影响细胞增殖和细胞亡.
科学领域:
- 表观遗传学和分子生物学
- 癌症生物学 癌症生物学
背景情况:
- 基因组甲基转移酶缺失,小或同源性盘状1 (ASH1L) 蛋白质含有SET,PHD,MID和BAH域.
- SET域调解H3K36me2,但PHD-BAH域的功能在很大程度上是未知的.
- 这项研究研究了ASH1L PHD-BAH域的生物学作用.
研究的目的:
- 阐明PHD-BAH域在ASH1L中的功能.
- 为了确定PHD-BAH域与基因素修饰的相互作用.
- 调查PHD-BAH域在胆管癌 (CHOL) 细胞行为中的作用.
主要方法:
- Prokaryotic 的蛋白质表达和净化过程.
- 拉下测试和同热定位热量计 (ITC)
- 在位点定向的突变发生和CRISPR-Cas9基因编辑.
- 细胞培养,西部涂抹,增殖和亡试验.
主要成果:
- ASH1L PHD-BAH 域优先结合 H3K4me2,而不是 H3K4me1 和 H3K4me3.
- 一个W2603A突变破坏了H3K4me2在体外的相互作用.
- 在ASH1L中PHD-BAH域的删除或突变增加了CHOL细胞亡和减少了增殖 (P < 0.001).
- 该W2603A突变影响了20S蛋白质酶子单元β (PSMB) 基因家族的调节.
结论:
- 这种W2603A突变对PHD-BAH域的H3K4me2相互作用至关重要.
- ASH1L通过其PHD-BAH域调节CHOL细胞的存活和增殖.
- ASH1L调节PSMB基因家族表达,以控制CHOL细胞命运.
相关概念视频
Spreading 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
Epigenetic Regulation
3.0K
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
3.0K
Histone Modification
13.2K
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...
13.2K
Inheritance of Chromatin Structures
6.2K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
6.2K
Chromatin Modification in iPS Cells
1.6K
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...
1.6K
Histone Variants at the Centromere
4.3K
Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
4.3K


