MUS81的酸化状态是BRCA2缺乏细胞中Olaparib敏感性的修饰剂
Francesca Blandino1, Eva Malacaria1, Carolina Figlioli1
1Mechanisms, Biomarkers and Models Unit, Department of Environment and Health, Istituto Superiore di Sanità - Viale Regina Elena 299, 00161 Rome, Italy.
Nucleic acids research
|May 31, 2023
概括
线粒分裂中MUS81功能丧失会影响BRCA2缺陷细胞的活力,但不会影响PARPi敏感性. 然而,构成性MUS81活动通过割裂停滞的复制叉来赋予PARPi抗性.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 癌症研究 癌症研究
背景情况:
- MUS81复合体对基因组稳定至关重要,在线粒分裂过程中分解DNA中间体,并在BRCA2缺乏细胞中处理不受保护的复制分叉.
- 哺乳动物细胞具有不同的MUS81复合体,在M-阶段和S-阶段活跃,因此对MUS81在BRCA2缺乏细胞的PARPi敏感性中的作用产生不确定性.
研究的目的:
- 研究MUS81功能丧失如何影响BRCA2缺陷细胞的活力和PARPi敏感性.
- 阐明MUS81影响PARPi电阻的机制.
主要方法:
- 使用一种突变MUS81的M相功能受损.
- 表达一个构成性活跃的MUS81.1.
- 分析DNA修复途径,包括Polθ-依赖的双链断裂修复.
主要成果:
- 缺乏BRCA2的细胞的活力,但不是他们的PARPi敏感性,取决于完全功能性的MUS81在线粒分裂.
- 构成性活跃的MUS81赋予了PARPi的抗性.
- 在S相分裂中,线粒体MUS81的放松调节在逆转之前阻碍了复制分叉,绕过了降低保护并促进了Polθ依赖的修复.
结论:
- 一个新的PARPi抗性的机制涉及完整的复制叉的MUS81-依赖的裂变.
- 在S相中,MUS81在S87的过酸化可能作为识别PARPi耐药性的生物标志物.
相关概念视频
Covalently Linked Protein Regulators
6.9K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
6.9K
Phosphorylation
50.6K
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...
50.6K
PI3K/mTOR/AKT Signaling Pathway
3.7K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.7K
Abnormal Proliferation
4.6K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.6K
mTOR Signaling and Cancer Progression
3.8K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
3.8K
Protein Kinases and Phosphatases
13.2K
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
13.2K


