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相关概念视频

Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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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.
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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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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...
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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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Electron Transport Chain: Complex I and II01:46

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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相关实验视频

Updated: Sep 20, 2025

Deacetylation Assays to Unravel the Interplay between Sirtuins SIRT2 and Specific Protein-substrates
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关于sirtuin 2活动和调制的结构基础:当前状态和机遇

Samuel P Bernhard1, Francesc X Ruiz2, Stacy Remiszewski3

  • 1Division of Chemistry, Conifer Point Pharmaceuticals, Doylestown, Pennsylvania, USA.

The Journal of biological chemistry
|May 24, 2025
PubMed
概括

塞尔图因2 (SIRT2) 酶结构已得到充分研究,但其对治疗效益的调制需要进一步研究激活,抑制和向癌症等特定疾病.

关键词:
塞尔图因 2 2 在通过全osteric 调制.癌症 癌症 癌症 癌症 癌症晶体结构的结晶结构.发现药物的发现.传染病是一种传染性疾病.

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科学领域:

  • 生物化学和结构生物学
  • 酶学 是一种酶学.
  • 药用化学 医学化学

背景情况:

  • 赛尔图因2 (SIRT2) 是一种依赖NAD+的脱乙酶,在细胞过程中具有广泛的调节作用.
  • 许多SIRT2的晶体结构为其催化机制和基质相互作用提供了洞察力.
  • 尽管有结构知识,但理解SIRT2的全部功能范围和开发选择性调制器仍然具有挑战性.

研究的目的:

  • 审查SIRT2的结构生物学,重点关注其催化核心,基质结合和调节器相互作用.
  • 探索对SIRT2分子调制的结构性见解,包括抑制和选择性.
  • 讨论结构变化的影响,并确定知识差距,以开发优化的SIRT2调制器.

主要方法:

  • 分析现有的SIRT2晶体结构 (报告超过39个).
  • 对基于机制,基质模仿和口袋结合抑制剂的文献综述.
  • 检查结构变异,包括突变,翻译后修饰和四级状态.

主要成果:

  • SIRT2的催化核心具有可适应的结合口袋,用于乙链和辅因子.
  • 特定的选择性口袋允许通过各种化学类型进行有针对性的抑制.
  • 结构数据为基于机制和基质的抑制剂的设计提供了信息.

结论:

  • 需要进一步的结构和功能研究,以充分理解SIRT2调制的治疗应用.
  • 调查无序端子,四次状态和翻译后修改对于开发定制的SIRT2调制器至关重要.
  • 解决知识差距将释放SIRT2在病毒感染和癌症等疾病中的治疗潜力.