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相关概念视频

Initiation of Translation02:33

Initiation of Translation

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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Transcription Initiation01:47

Transcription Initiation

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Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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S-Cdk Initiates DNA Replication02:38

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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
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相关实验视频

Updated: Feb 11, 2026

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors
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Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

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一个HIV-1逆转录酶启动复合物的结构

Kevin P Larsen1,2, Yamuna Kalyani Mathiharan3, Kalli Kappel1

  • 1Program in Biophysics, Stanford University, Stanford, CA, USA.

Nature
|April 27, 2018
PubMed
概括

人类免疫缺陷病毒1型 (HIV-1) 逆转录酶 (RT) 启动复合物的结构揭示了RNA结合如何使酶失活. 这一发现为抗逆转录病毒药物开发提供了潜在的新目标.

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Measurement of In Vitro Integration Activity of HIV-1 Preintegration Complexes
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Amplifying and Quantifying HIV-1 RNA in HIV Infected Individuals with Viral Loads Below the Limit of Detection by Standard Clinical Assays
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Amplifying and Quantifying HIV-1 RNA in HIV Infected Individuals with Viral Loads Below the Limit of Detection by Standard Clinical Assays

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Amplifying and Quantifying HIV-1 RNA in HIV Infected Individuals with Viral Loads Below the Limit of Detection by Standard Clinical Assays
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科学领域:

  • 结构生物学
  • 病毒学
  • 药物发现

背景情况:

  • 对HIV-1RNA基因组的逆转录对病毒感染至关重要,也是抗逆转录病毒疗法的关键目标.
  • 艾滋病毒-1逆转录酶 (RT) 催化了这一过程,利用宿主转移RNA (tRNA) 作为原料.
  • 关于RT启动的精确结构机制,特别是其监管,仍然不太清楚.

研究的目的:

  • 阐明HIV-1RT启动复合体的三维结构.
  • 在逆转录的启动阶段了解RT监管的结构基础.
  • 确定抗逆转录病毒药物开发的潜在新目标.

主要方法:

  • 使用冷电子显微镜 (cryo-EM) 来确定HIV-1 RT启动复合物的结构.
  • 综合体的分析涉及RT,tRNA和病毒RNA之间的相互作用的详细检查.
  • 结构数据与有关RT活动的功能观察结果相关.

主要成果:

  • 确定的结构显示HIV-1 RT是一种不活跃的聚合酶构造,其特征是开放的手指和指域.
  • 包括tRNA和病毒RNA在内的原始模板复合体远离活性部位,形成了广泛的螺旋结构.
  • 特定的RNA重新折叠和堆叠相互作用创造了一个长的螺旋结构,并将病毒RNA元素放置在RT活性部位上方,阻碍活性.

结论:

  • 艾滋病毒-1 RT启动复合物的结构表明RNA结合如何诱导不活跃的RT构造,从而调节酶活性.
  • 这些发现为RT启动及其监管的结构性基础提供了关键的见解.
  • 这些已识别的结构特征代表了新型抗逆转录病毒药物设计的潜在新目标.