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Replication in Eukaryotes02:31

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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一个alphacoronavirus聚合酶结构揭示了保存的复制因子功能.

Thomas K Anderson1,2,3, Peter J Hoferle1,2,3, Kennan J Chojnacki1,2,3

  • 1Biochemistry Department, University of Wisconsin-Madison, Madison, WI 53706, USA.

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研究人员研究了猪流行性腹病毒 (PEDV) 聚合酶复合体,揭示了其RNA复制机制. 这项研究有助于开发针对冠状病毒的广泛抗病毒药物.

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科学领域:

  • 病毒学 病毒学
  • 结构生物学 结构生物学
  • 分子生物学分子生物学

背景情况:

  • 冠状病毒是人类和动物的重要病原体.
  • 了解冠状病毒复制对于开发抗病毒疗法至关重要.
  • 与贝塔冠状病毒 (例如,SARS-CoV-2) 相比,阿尔法冠状病毒,如PEDV,研究不足.

研究的目的:

  • 阐明alphacoronavirus猪流行性腹病毒 (PEDV) 核心聚合酶复合物的结构和功能.
  • 研究nsp7,nsp8和nsp12蛋白在RNA复制中的作用.
  • 为了确定广泛的抗病毒药物开发的保存目标.

主要方法:

  • 使用冷电子显微镜 (cryo-EM) 来确定与RNA结合的PEDV核心聚合酶复合物的结构.
  • 进行了生物化学分析,以评估nsp8在RNA合成中的功能.

主要成果:

  • 冷-EM结构揭示了nsp8在复合体内与RNA结合时的意想不到的静态度.
  • 生物化学测试表明,nsp8的N端延伸在阿尔法冠状病毒和β冠状病毒的体外RNA合成中是不可缺少的.
  • 这突出了冠状病毒RNA复制中的保存机制.

结论:

  • 研究各种冠状病毒,包括阿尔法冠状病毒,对于全面了解病毒复制是必不可少的.
  • 这些发现提供了对冠状病毒聚合酶复合体保存的结构和功能方面的见解.
  • 这项研究确定了针对一系列冠状病毒开发新型抗病毒药物的潜在保护目标.