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相关概念视频

Leaky Scanning02:28

Leaky Scanning

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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 Splicing01:32

RNA Splicing

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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Alternative RNA Splicing02:18

Alternative RNA Splicing

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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Pre-mRNA Processing: RNA Splicing01:36

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Viral Mutations00:36

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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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Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

Pre-mRNA Processing: Modification of pre-mRNA Ends

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
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相关实验视频

Updated: Jun 25, 2025

Using the E1A Minigene Tool to Study mRNA Splicing Changes
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Using the E1A Minigene Tool to Study mRNA Splicing Changes

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通过病毒传递改善了蛋白质拼接.

Adam J Hume1,2,3, Dylan J Deeney1,2, John S Smetana4

  • 1Department of Microbiology, Boston University School of Medicine, Boston, Massachusetts, USA.

mBio
|May 23, 2024
PubMed
概括
此摘要是机器生成的。

再组合埃博拉病毒的连续传递工程与干预蛋白质 (intin) 记者导致突变,增强intin拼接活动. 这些蛋白质突变在不同系统和环境中提高了催化效率,为蛋白质开发提供了一种新方法.

关键词:
埃博拉病毒埃博拉病毒.没有任何的意义,没有任何意义.蛋白质拼接 蛋白质拼接病毒报告员病毒报告员自动拼接的光灯记者

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科学领域:

  • 分子生物学分子生物学
  • 病毒学 病毒学
  • 蛋白质工程是指蛋白质工程.

背景情况:

  • 干预性蛋白质 (inteins) 是蛋白质元素,它们自剪切并结合侧面序列 (exteins).
  • 整因已经被设计成生物系统的记者,例如使用Rada整因和ZsGreen光蛋白 (ZsG) 的埃博拉病毒 (EBOV) 自删除翻译记者.
  • 此前将该报告者纳入重组EBOV (rEBOV-RadA-ZsG) 导致了复制缺陷,可能是由于RADA拼接不足.

研究的目的:

  • 调查串行传递对rEBOV-RadA-ZsG的复制效率的影响.
  • 识别和描述在病毒环境中增强蛋白活性的突变.
  • 建立一种新的策略来选择具有改进的催化性能的整体.

主要方法:

  • 在人类细胞中连续传递rEBOV-RadA-ZsG.
  • 通过病毒基因组的测序以确定突变.
  • 评估原生细胞和真核细胞表达系统中的蛋白质活性,具有各种蛋白质背景.

主要成果:

  • 与未经传递的病毒相比,连续传递显著提高了rEBOV-RadA-ZsG的复制效率.
  • 测序揭示了特定的因丁相关突变.
  • 这些已识别的突变增强了在多种表达系统和外表环境中蛋白质的活性.

结论:

  • 病毒传递是一种有效的方法,用于隔离具有增强催化活性的素.
  • 鉴定到的突变赋予了改善的蛋白质拼接效率,独立于蛋白质的环境或表达系统.
  • 这项工作提出了一种新方法,用于开发用于蛋白质工程应用的高度活性蛋白质.