剖析Cdc37辅助器代码:辅助器介导应激适应中的功能作用
Megan M Mitchem1, Ashley Choi1, Duhita A Mirikar1
1Department of Biological Sciences, The University of North Carolina at Charlotte, Charlotte, NC 28223.
The Journal of biological chemistry
|September 3, 2025
概括
化Cdc37,一个蛋白激酶辅助子,对于细胞应激耐受性至关重要. 这项研究揭示了34个新的酸化位点,这些位点以环境依赖的方式调节Cdc37的功能,从而影响蛋白质稳定.
科学领域:
- 分子生物学
- 细胞生物学
- 生物化学
背景情况:
- Cdc37是一个关键的辅助器,它将蛋白激酶与Hsp90辅助器连接起来.
- 化14 (S14) 和17 (S17) 是已知的Cdc37活性调节剂.
- 化对整个Cdc37蛋白的综合影响在很大程度上仍未被探索.
研究的目的:
- 系统地研究Cdc37蛋白的所有潜在位点的酸化的功能后果.
- 在各种细胞条件下确定调节Cdc37功能的新酸化位点.
- 为了解Cdc37在细胞蛋白质稳定和疾病中的后翻译性修饰的作用建立资源.
主要方法:
- 创建一个包括46个酵母菌株的"Cdc37代码集合",每个酵母菌株都表达Cdc37的单个位突变.
- 在广泛的环境和化学压力因素中对这些突变菌株进行了广泛的表型分析.
- 压力反应表型的比较分析,以确定不同酸化位点的独特和重叠的调节作用.
主要成果:
- 已证实正规化位点 (S14,S17) 对于应力耐受性至关重要.
- 34种新型基突变体表现出不同的特异性表型,表明它们具有不同的调节作用.
- 在新突变中压力反应的最小重叠表明了Cdc37功能的模块化和上下文依赖的调节.
- 特定位点的化复杂地调节了Cdc37在各种细胞挑战下维持蛋白质稳定的能力.
结论:
- 通过特定位点的酸化,Cdc37的功能受到广泛调节,影响其维持蛋白质稳定性的作用.
- 这项研究确定了Cdc37的许多新型调节化位点,扩大了我们对其翻译后调节的理解.
- 这些发现为未来对伴随性激酶网络及其疾病状态失调的研究提供了宝贵的资源.
相关概念视频
Molecular Chaperones and Protein Folding
18.4K
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
The...
18.4K
Bacterial Protein Maturation
81
Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
81
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
Other Stress Responses in Bacteria
64
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
64
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
Export of Misfolded Proteins out of the ER
3.9K
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
3.9K


