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相关概念视频

Leaky Scanning02:28

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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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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 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.
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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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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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人类SRD5A1 mRNA中的三重编码.

Martina M Yordanova1, Conor Slattery1, Mirriam Baranova-Gurvich1

  • 1University College Cork.

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|January 7, 2025
PubMed
概括
此摘要是机器生成的。

研究人员发现,mRNA在所有三种读取框架中的同时翻译,产生了不同的SRD5A1蛋白质. 这种三重解码,虽然在进化上是保存的,但主要是调节翻译而不是蛋白质功能.

关键词:
重叠的基因是重叠的基因.在SRD5A1中,它是SRD5A1的.基因注释 基因注释蛋白质合成 蛋白质合成核糖体决策图表 核糖体决策图翻译控制 翻译控制开始翻译 开始翻译翻译 翻译 翻译 翻译在 uORF 的情况下.

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.
  • 进化生物学 进化生物学

背景情况:

  • RNA可以在三个读取中翻译,产生不同的蛋白质产品.
  • 二重编码 (两个读取) 是已知的,但三重编码的理解较少.

研究的目的:

  • 在所有三种读取框架中调查SRD5A1位置的mRNA转录的同时翻译.
  • 描述由此产生的蛋白形及其进化意义.

主要方法:

  • 对核糖体概况数据的分析.
  • 在各种细胞环境中进行基因表达测试.
  • 遗传学分析. 遗传学分析.

主要成果:

  • 在三个读取中同时翻译SRD5A1mRNA,通过在三个附近的AUG编码子启动产生长蛋白.
  • 只有一个蛋白质形式拥有保存的催化域;矛盾的是,最有效地翻译的形式是催化不活跃的.
  • 三重解码是灵长类的特异性,而该机制是胎盘哺乳动物的祖先,表明一个调节作用.

结论:

  • SRD5A1三重解码的进化意义在于翻译调节,不一定是其产品的生物功能.
  • 无论产品的功能如何,识别和描述所有生产性RNA翻译都至关重要.