伊诺西酸盐可以动态增强mTOR的稳定性,可溶性和催化活性
Lucia E Rameh1, John D York2, Raymond D Blind3
1Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, Alabama, USA; Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee, USA; Department of Medicine, Division of Diabetes, Endocrinology and Metabolism, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
The Journal of biological chemistry
|December 20, 2024
概括
伊诺醇酸盐,包括伊诺醇基酸盐 (IP6),可以动态调节拉帕米辛 (mTOR) 激酶的机械标. 这些化合物增强了mTOR活性,并促进了更稳定的,可溶性活性状态,这证明了进一步的细胞研究是合理的.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
背景情况:
- 拉巴胺素 (mTOR) 的机械标是细胞生长和新陈代谢的关键调节剂.
- 虽然已知mTOR可以结合伊诺西六酸盐 (IP6),但其作为结构或催化调节剂的确切功能作用尚不清楚.
- 异醇酸盐 (IPs) 是多样化的信号分子,具有各种细胞功能.
研究的目的:
- 研究伊诺西酸盐物种对mTOR和mTOR复合1 (mTORC1) 激酶活性的调节作用.
- 确定不同类型的伊诺西酸盐对mTOR的催化效率和基质酸化的影响.
- 探索伊诺西酸盐在调节mTOR的结构和功能性质方面的潜力.
主要方法:
- 在体外激酶试验中,使用纯化的mTOR和mTORC1复合物进行了试验.
- 对ATP和基质的运动参数 (VMAX,KM) 的表征.
- 对伊诺西酸盐对蛋白质溶解性和电泳性移动性的影响的分析.
- 伊诺西酸与mTOR结合的可逆性研究.
主要成果:
- 外源添加的内醇酸盐 (IP6,IP5,IP4,IP3) 在体外增强了mTOR和mTORC1激酶活性,高酸化状态更强.
- IP6增加了mTOR中ATP的VMAX和明显KM,同时随着时间的推移稳定了mTORC1的活性形式.
- IP6与mTOR的结合是可逆的,并影响其电泳流动性和溶解性.
- 伊诺西酸盐促进了mTORC1.1.的更稳定和更可溶性的活性状态.
结论:
- 多种异醇酸盐物种可以动态调节mTOR和mTORC1活动.
- 伊诺西酸盐通过促进稳定,可溶性活性构造来增强激酶功能.
- 这些发现支持进一步调查mTOR.mTOR的内醇酸盐调节的细胞动态.
相关概念视频
PI3K/mTOR/AKT Signaling Pathway
3.4K
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...
3.4K
mTOR Signaling and Cancer Progression
3.7K
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...
3.7K
Phosphoinositides and PIPs
8.4K
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
8.4K
Protein Kinases and Phosphatases
13.0K
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...
13.0K
Phosphorylation
49.9K
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...
49.9K
The JAK-STAT Signaling Pathway
8.7K
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
8.7K


