相关实验视频
Updated: Jul 20, 2025

00:08
A Rapid In Vivo Bioassay for Developmentally Active Enhancers
1.3K
AT-hook 是 SWI/SNF 的一个进化保守的自我调节域,它是细胞谱系原始化所需的
Dhurjhoti Saha1,2, Solomon Hailu1,2,3, Arjan Hada1,2
1Department of Epigenetics and Molecular Carcinogenesis, Univ. of Texas MD Anderson Cancer Center, Houston, TX, 77230, USA.
Nature communications
|August 4, 2023
概括
在SWI/SNF染色体重塑剂中的AT-hook基因调节DNA结合和ATPase活性. 这种调节对基因转录,细胞分化和酵母和小鼠模型中的细胞生长至关重要.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
- 染色体重塑 染色体重塑 的方法
背景情况:
- SWI/SNF复合体是表观遗传学的关键调节者,控制细胞多能性和分化.
- 在染色体修饰剂中发现的AT-hook图案,通常被认为有助于DNA结合.
研究的目的:
- 研究AT-hook图案在SWI/SNF复合体中的特定作用.
- 为了确定AT是否影响DNA结合亲和力或酶活性.
主要方法:
- 生物化学测定测量ATPase活性和基质亲和力 (KM).
- 在酵母和小鼠胚胎干细胞中的体内研究,以评估SWI/SNF重塑活性.
- 对基因转录和增强剂激活的分析.
主要成果:
- 在不改变基质亲和性的情况下,AT-hook显著增加了SWI/SNF的DNA刺激的ATPase活性 (13倍).
- 这种增强的ATPase活性与核酶运动紧密相关.
- 在体内,AT对于酵母和小鼠细胞中的SWI/SNF功能至关重要,影响转录和增强器激活.
结论:
- AT-hook的主要作用是调节SWI/SNF的催化活性,而不仅仅是DNA招募.
- 这种调制对于调节基因表达,细胞系原始化和细胞生长至关重要.
- 通过像AT-hook调制这样的机制准SWI/SNF活动,与完全的酶抑制相比,提供了一种微妙的方法.
相关概念视频
Restarting Stalled Replication Forks
5.8K
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
5.8K
Lineage Commitment
3.0K
Commitment is the process whereby stem cells:
3.0K
Conserved Binding Sites
4.2K
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
4.2K
Nucleosome Remodeling
9.2K
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...
9.2K
Regulation of Expression at Multiple Steps
944
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
944
Cell Signaling Feedback Loops
6.4K
Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
6.4K

