了解遗传编码的标签和拥挤剂如何影响异染色蛋白HP1α的相分离
Ziling Kate Zhou1, Kibeom Hong2, Bo Huang3
1Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA.
Cell reports methods
|April 22, 2025
概括
像GFP这样的基因编码的光标签可以抑制异色素蛋白1α (HP1α) 的相分离. 一个小的UnaG标签最小地扰乱HP1α相分离,使细胞可视化.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 已知异染色蛋白蛋白1α (HP1α) 经历相分离.
- 阶段分离通常在细胞中使用光蛋白标签进行研究,例如绿色光蛋白 (GFP).
- 这些标签对HP1α内在相分离特性的影响在很大程度上仍未得到研究.
研究的目的:
- 为了研究标签大小和链接器长度如何影响HP1α相位分离在体外.
- 评估不同标签的适用性,以研究细胞环境中的HP1α动态.
- 评估聚乙烯糖醇 (PEG) 作为拥挤剂对蛋白质相分离的影响.
主要方法:
- 在试验室中对HP1α进行相分离试验,使用不同的标签和链接器长度.
- 使用绿色光蛋白 (GFP) 和UnaG标签与甘氨酸-甘氨酸-氨酸 (GGS) 连接器.
- 使用UnaG标签观察细胞中的HP1α动态.
- 用聚乙烯甘醇 (PEG) 作为拥挤剂进行实验.
主要成果:
- 绿色光蛋白 (GFP) 标签在体外显著抑制了HP1α相分离.
- 带有16个氨基酸GGS链接器的UnaG标签在体外极少影响HP1α相分离.
- UnaG标签允许成功可视化细胞内的HP1α动态.
- 聚乙烯甘醇 (PEG) 诱导了缺乏内在相隔倾向的蛋白质的相分离,并改变了HP1α突变的影响.
结论:
- 在研究HP1α相分离时,标签选择至关重要,因为像GFP这样的大标签可以干扰其生物物理性质.
- UnaG标签为可视化 HP1α 阶段分离在细胞环境中提供了一个极少扰乱的替代方案.
- 使用像PEG这样的拥挤剂获得的结果应谨慎解释,因为它们有可能诱导或掩盖相位分离现象.
相关概念视频
Heterochromatin
11.6K
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...
11.6K
Position-effect Variegation
6.3K
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.
6.3K
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
DNA Packaging
102.3K
Overview
102.3K
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
Separation of Sister Chromatids
3.6K
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
3.6K


