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相关概念视频

Mismatch Repair01:20

Mismatch Repair

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
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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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协同使用多分辨率模拟,接口重新设计和热点映射来解读VCP中的病原性突变驱动结构调制.

Amar Jeet Yadav1, Aditya K Padhi1

  • 1Laboratory for Computational Biology & Biomolecular Design, School of Biochemical Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, Uttar Pradesh, India.

Computers in biology and medicine
|June 14, 2025
PubMed
概括
此摘要是机器生成的。

含有瓦洛辛的蛋白质 (VCP/p97) 的突变破坏了它的结构,破坏了预防IBMPFD和ALS等疾病至关重要的蛋白质降解途径.

关键词:
双-psi β-桶的双重-psi-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel-barrel接口重新设计的界面重新设计.分子对接是分子对接.分子动力学模拟模型雨抽样是统一的抽样方式.含有瓦洛的蛋白质.

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科学领域:

  • 生物化学 生物化学
  • 结构生物学 结构生物学
  • 计算生物学 计算生物学

背景情况:

  • 含有瓦洛的蛋白质 (VCP/p97) 是一个关键的AAA+ ATPase,通过ER相关降解 (ERAD) 等途径调节蛋白质稳定.
  • 特定突变,如Arg95Gly (R95G),在VCP中与蛋白质病变有关,包括包容体肌病症与帕杰特病和前性痴呆症 (IBMPFD) 和肌性侧面硬化症 (ALS).

研究的目的:

  • 阐明VCP中R95G突变引起的结构和动态变化.
  • 了解这些变化如何导致VCP功能障碍并导致相关疾病.

主要方法:

  • 集成的AlphaFold3建模,蛋白质-对接和多尺度分子动力学 (MD) 模拟 (全原子,粗粒度,雨采样).
  • 利用MM/PBSA和潜在的平均力 (PMF) 分析来评估约束热力学.
  • 执行了接口热点映射以识别动态干扰.

主要成果:

  • R95G突变破坏了VCP N终端域的双ψβ-桶 (DPBB) 的稳定性,并破坏了域间合.
  • 这导致了形状异质性,阻碍了gp78辅因子的招募.
  • 观察到受损的结合热力学和性脱,影响了蛋白质的相互作用网络.

结论:

  • R95G突变引发了从局部结构破坏到VCP的全球功能损害的级联.
  • 这项研究为了解IBMPFD和ALS中的VCP功能障碍提供了一个计算框架.
  • 这些发现可以指导开发治疗策略,以恢复VCP功能.