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Chromatin Structure Regulates pre-mRNA Processing02:41

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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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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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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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
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Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins
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ヘルペス・シンプレックスウイルスは,ポリ (A) サイト利用を刺激する処理因子を誘発します.

J McLauchlan1, S Simpson, J B Clements

  • 1MRC Virology Unit, University of Glasgow, Scotland.

Cell
|December 22, 1989
PubMed
まとめ
この要約は機械生成です。

ヘルペス・シンプレックスウイルスに感染した細胞からの核抽出物は,特定のウイルスポリ (A) サイトでのRNA処理の増加を示しています. この熱可動性活動は,in vitroおよびin vivoで観察され,後期ウイルスポリアデニレーションの効率を高めます.

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Temporal Analysis of the Nuclear-to-cytoplasmic Translocation of a Herpes Simplex Virus 1 Protein by Immunofluorescent Confocal Microscopy
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Temporal Analysis of the Nuclear-to-cytoplasmic Translocation of a Herpes Simplex Virus 1 Protein by Immunofluorescent Confocal Microscopy
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科学分野:

  • 分子生物学は分子生物学である.
  • ウイルス学 ウイルス学 ウイルス学
  • 遺伝子発現の表現について

背景:

  • ヘルペス・シンプレックスウイルス (HSV) の遺伝子発現には,ポリアデニレーションを含む転写後の改変が含まれています.
  • ポリアデニレーション部位の選択は,RNA処理における重要な規制ステップである.
  • ウイルスのRNA処理因子を理解することで,ウイルスの遺伝子調節のメカニズムを明らかにすることができます.

研究 の 目的:

  • ヘルペス・シンプレックスウイルスのポリ (A) サイトでのRNAの処理を調査する.
  • HSVポリアデニレーション効率に影響を与える潜在的な細胞またはウイルス要因を特定する.
  • 特定のウイルスポリ (A) サイトが,感染した細胞で異なった方法で処理されているかどうかを判断する.

主な方法:

  • HSV感染細胞と偽感染細胞の核抽出物を用いたインビトロ加工アッセイ.
  • トランデムウイルスポリアサイトと前駆体RNAを用いたポリアサイト処理効率の比較.
  • 熱可変性測定は,特定された加工活動を特徴付けるためのものです.
  • 再結合ウイルスのウイルスRNAを分析し,in vivoの発見を確認する.

主要な成果:

  • HSVに感染した細胞からの核抽出物は,HSVポリ (A) の特定の後期部位において,強化された処理活性を示します.
  • 2つ目のHSVポリ (A) サイトでは,感染した細胞抽出物と,感染した模擬細胞抽出物の両方において,同様の処理効率を示した.
  • 観察された特定の加工活動は熱に耐性がないことが判明しました.
  • 再結合ウイルスを用いた in vivo 試験では,後期ウイルスポリ (A) 部位での処理の増加が確認されました.

結論:

  • HSVに感染した細胞に存在する特定の熱可動性活性が,遅いウイルスポリ (A) 部位の処理を強化します.
  • この因子は,特定のHSV poly ((A)) 部位におけるポリアデニレーション効率の調節に役割を果たします.
  • この発見は,HSV感染中にウイルスの遺伝子発現の微分調節のためのメカニズムを示唆しています.