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相关概念视频

RNA Editing02:23

RNA Editing

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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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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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From DNA to Protein03:06

From DNA to Protein

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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Overview
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tRNA Activation02:26

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Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
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Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Updated: Sep 18, 2025

Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System
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通过可编程的伪尿素编辑和解码来扩展RNA编码子

Jiangle Liu1,2,3, Xueqing Yan1, Hao Wu1,3

  • 1The National Key Laboratory of Gene Function Studies and Manipulation, School of Life Sciences, Peking University, Beijing, China.

Nature
|June 25, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新的RNA编码扩展 (RCE) 策略,使用伪尿素 (Ψ) 编码来精确地在哺乳动物细胞中结合非正规氨基酸 (ncAA). 这种方法增强了特异性,并为遗传字母扩展提供了新的途径.

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Identifying Amino Acid Overproducers Using Rare-Codon-Rich Markers
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科学领域:

  • 合成生物学
  • 分子生物学
  • 生物化学

背景情况:

  • 非正规氨基酸 (ncAAs) 允许通过定制化学量身定制的蛋白质功能.
  • 遗传密码扩展 (GCE) 使用停止密码重新分配来进行ncAA结合,但缺乏完全的正交性.
  • 需要在蜂系统中使用更具体和正交的ncAA编码方法.

研究的目的:

  • 开发一种新的RNA密码扩展 (RCE) 策略,用于特定地点的ncAA整合.
  • 使用伪尿素 (Ψ) 创建生物直角的"空白"子,以提高翻译特异性.
  • 建立一种扩展真核细胞遗传字母的方法.

主要方法:

  • 开发了一种涉及可编程指导RNA,工程tRNA和氨基tRNA合成酶的RCE策略.
  • 在特定的mRNA转录中引入和解码伪尿素 (Ψ) 编码子 (ΨGA, ΨAA, ΨAG).
  • 在哺乳动物细胞中测试了RCE系统的直角性和特异性.

主要成果:

  • RCE (ΨGA) 系统表现出比GCE更高的转基因范围和蛋白质特异性.
  • 已建立的RCE (ΨAA) 和RCE (ΨAG) 系统,显示所有三种 Ψ 编码对的相互正交.
  • 在双 ncAA 编码中证明了 RCE 和 GCE 的兼容性.

结论:

  • RCE 策略有效地使用 Ψ 作为编码特定 RNA 编码的后转录元件.
  • 这种方法为真核细胞中特定的ncAA整合提供了一个新的,高度特异性的途径.
  • RCE扩大了遗传字母扩展和定制蛋白质工程的可能性.