α亚单元的酸化抑制了蛋白酶组合,并调节了archaeon中的细胞循环
Ya Wu1, Qi Gan1, Kanghui Ning1
1CRISPR and Archaea Biology Research Center, State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, 72 Binhai Road, Qingdao 266237, China.
Current biology : CB
|February 6, 2026
概括
研究人员发现,蛋白质激酶ePK2通过酸化蛋白质酶α子单元来控制 Sulfolobales archaea 中的细胞分裂. 这种酸化影响蛋白酶组合和细胞分裂,为真核细胞细胞循环调节提供了洞察力.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 古代生物,特别是硫类生物,表现出类似于真核生物的细胞分裂和细胞循环.
- 这些生物体中细胞分裂和细胞循环控制的精确机制在很大程度上是未知的.
研究的目的:
- 为了研究一个真核生物样蛋白激酶 (ePK2) 在调节细胞分裂和蛋白酶组合中的作用在Saccharolobus islandicus.
- 阐明ePK2影响古生物细胞分裂的分子机制.
主要方法:
- 在转录和转化层面研究了EPK2的细胞周期依赖表达.
- 研究epk2基因缺失和过度表达对细胞分裂和蛋白质酶活性的影响.
- 在ePK2.2.所针对的蛋白酶体α子单元上确定并分析了特定的酸化位 (S200和T213).
主要成果:
- 蛋白酶体α子单元的ePK2酸化会影响20S蛋白酶体组合,并控制细胞分裂.
- 删除或过度表达epk2导致细胞动能受损,细胞分裂有明显的缺陷.
- 过度表达ePK2降低了蛋白质酶的活性,并促进了细胞分裂蛋白的降解,在S200和T213的酸化中破坏了蛋白质酶组装.
结论:
- 在Sulfolobales archaea中发现了一种新型的蛋白酶酸化介导的细胞分裂调节机制.
- 这种涉及ePK2和蛋白质酶α子单元的机制是真核细胞细胞循环调节的原型.
- 这些发现为细胞分裂机制从古生物到真核生物的演变提供了重要的见解.
相关概念视频
02:18The Proteasome
10.3K
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
10.3K
01:13The Proteasome
1.7K
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
1.7K
02:18The Proteasome
4.6K
4.6K
02:58Regulated Protein Degradation
8.9K
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...
8.9K
02:41Protein Complex Assembly
16.8K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
16.8K
01:02Phosphorylation
54.3K
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
54.3K