相关实验视频
Updated: Sep 8, 2025

08:35
Examining BCL-2 Family Function with Large Unilamellar Vesicles
Published on: October 5, 2012
8.0K
Cul5Wsb2使用BCL2蛋白作为共同受体,以向Bim进行降解
Wilhelm Vaysse-Zinkhöfer1, Enya Marie Catherine Alcindor1, Nicholas Garaffo2
1Department of Biochemistry, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, CA, USA.
bioRxiv : the preprint server for biology
|August 20, 2025
概括
这项研究表明,BCL2蛋白通过E3无酸酶Cul5Wsb2招募Bim进行降解. 这种新型的亡调节机制对神经母细胞瘤和癌症疗法有影响.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 亡对于消除受损细胞至关重要.
- 反亡的BCL2蛋白质抑制了亲亡的蛋白质.
- 之前还不知道BCL2蛋白在向Bim降解中的作用.
研究的目的:
- 调查BCL2蛋白在向Bim降解中的作用.
- 为了识别参与这个过程的E3泛素结合酶.
- 探索这种途径在癌症中的治疗含义.
主要方法:
- 同免疫沉试验用于研究蛋白质相互作用.
- 局部定向的突变发生来破坏蛋白质结合接口.
- 西部涂抹以评估蛋白质水平和降解.
- 细胞活力测试用于评估亡诱导.
主要成果:
- BCL2蛋白质将Bim招募到E3无酸酶Cul5Wsb2中进行降解.
- Wsb2通过一个保留的图案识别了Bcl-xl,这与它与Mcl1.1的相互作用不同.
- 破坏Bcl-xl/Wsb2相互作用会抑制Wsb2与Bcl-xl/Bim复合体的结合.
- Wsb2通过一个单独的接口与Mcl1/Bim二元体相互作用.
- Wsb2在神经系统瘤细胞中是必不可少的,在那里它的击倒会诱导亡.
结论:
- 发现了一种新型的亡调节机制,涉及BCL2介导的Bim向Cul5Wsb2的招募,用于降解.
- Wsb2在细胞亡调节中起着至关重要的作用,特别是在神经母细胞瘤细胞中.
- 准这种BCL2-Wsb2-Bim通路为依赖亡逃避的癌症提供了潜在的治疗策略.
相关概念视频
The Intrinsic Apoptotic Pathway
6.8K
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
6.8K
Anaphase Promoting Complex
2.9K
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
2.9K
Regulated Protein Degradation
7.6K
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
7.6K
Receptor Downregulation in MVBs
2.1K
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
2.1K
Separation of Sister Chromatids
3.8K
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...
3.8K
The Extrinsic Apoptotic Pathway
6.6K
The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
6.6K

