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Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
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Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
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Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...

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Nucleocapsid Annealing-Mediated Electrophoresis (NAME) Assay Allows the Rapid Identification of HIV-1 Nucleocapsid Inhibitors
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通过针对性分子动力学模拟研究的非核酸HIV-1逆转录酶抑制剂中对Lys103Asn突变的影响的抗性分子基础.

Fátima Rodríguez-Barrios1, Jan Balzarini, Federico Gago

  • 1Department of Pharmacology, University of Alcalá, Madrid, Spain.

Journal of the American Chemical Society
|May 19, 2005
PubMed
概括

在HIV-1逆转录酶中的Lys103Asn突变阻碍非核酸RT抑制剂的结合. 分子动力学显示,埃特拉维林,埃法维伦兹和内维拉的结合受到这种突变的不同影响.

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科学领域:

  • 分子生物学分子生物学
  • 生物化学 生物化学
  • 结构生物学 结构生物学

背景情况:

  • 在HIV-1逆转录酶 (RT) 中,Lys103Asn突变很常见.
  • 这种突变会在Asn103和Tyr188之间产生键,阻碍NNRTI结合口袋的形成.
  • 以前的研究表明,这种结合阻碍了未结合状态下药物的结合.

研究的目的:

  • 评估Lys103Asn突变对内维拉平,埃法维伦兹和埃特拉维林与HIV-1的结合的影响.
  • 在NNRTI的存在下,研究HIV-1 RT从未结合到药物结合状态的动态形状变化.
  • 了解抑制剂进入途径和Asn103-Tyr188键的作用.

主要方法:

  • 使用了有针对性的分子动力学模拟.
  • 自动对接确定了绑定口袋外的初始药物位置.
  • 模拟器将抑制剂引导到结合口袋中,模仿进入途径.

主要成果:

  • Asn103-Tyr188的键对NNRTI的进入构成了额外的障碍.
  • 非NRTI破坏这种相互作用的能力有所不同:埃特拉维林 > 埃法维伦兹 >= 内维拉平.
  • 模拟结果与对抗突变的药物疗效的实验发现一致.

结论:

  • 动态结构方面对于理解和克服HIV-1RT的耐药性至关重要.
  • 基于结构的药物设计可以通过考虑酶动态来改进.
  • 这种方法提供了洞察力,传统的约束能源方法不足.