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Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
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Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
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Regulated mRNA Transport02:22

Regulated mRNA Transport

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Bacterial Transcription01:53

Bacterial Transcription

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RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
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mRNA Stability and Gene Expression02:51

mRNA Stability and Gene Expression

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Nonsense-mediated mRNA Decay

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Updated: Jul 2, 2025

A Novel Microdissection Approach to Recovering Mycobacterium tuberculosis Specific Transcripts from Formalin Fixed Paraffin Embedded Lung Granulomas
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A Novel Microdissection Approach to Recovering Mycobacterium tuberculosis Specific Transcripts from Formalin Fixed Paraffin Embedded Lung Granulomas

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不完全なトランスクリプトがMycobacterium tuberculosisトランスクリプトームを支配する

Xiangwu Ju1, Shuqi Li2, Ruby Froom2,3

  • 1Laboratory of Nanoscale Biophysics and Biochemistry, The Rockefeller University, New York, NY, USA.

Nature
|February 28, 2024
PubMed
まとめ
この要約は機械生成です。

ほとんどのMycobacterium tuberculosis (Mtb) のトランスクリプトは,細菌の適応の重要なチェックポイントであるRNAポリメラーゼの停止により不完全である. この停止メカニズムは, σ-因子と転写-翻訳結合によって影響を受け,結核の潜在的治療標的を提供します.

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Preparation of Mycobacterium Tuberculosis Culture Filtrate to Understand TB Pathogenesis
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Preparation of Mycobacterium Tuberculosis Culture Filtrate to Understand TB Pathogenesis

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Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems
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Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems

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関連する実験動画

Last Updated: Jul 2, 2025

A Novel Microdissection Approach to Recovering Mycobacterium tuberculosis Specific Transcripts from Formalin Fixed Paraffin Embedded Lung Granulomas
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A Novel Microdissection Approach to Recovering Mycobacterium tuberculosis Specific Transcripts from Formalin Fixed Paraffin Embedded Lung Granulomas

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Preparation of Mycobacterium Tuberculosis Culture Filtrate to Understand TB Pathogenesis
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Preparation of Mycobacterium Tuberculosis Culture Filtrate to Understand TB Pathogenesis

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Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems
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科学分野:

  • 微生物学
  • 分子生物学
  • 遺伝学

背景:

  • 結核菌 (Mycobacterium tuberculosis,Mtb) は結核 (TB) を引き起こし,世界的な健康問題となっています.
  • Mtbは遺伝子発現を変えることで 環境の変化に適応しますが 規制メカニズムは不明です

研究 の 目的:

  • Mtbの転写を制御するメカニズムを調査する.
  • 高解像度で Mtb トランスクリプトームをプロファイルする

主な方法:

  • バクテリア細胞のRNA分子の末端を決定するシーケンシング方法を使用した.
  • Mtbトランスクリプトームを分析して,トランスクリプト長さとRNAポリメラーゼ活性を特定した.

主要な成果:

  • 大半のMtbのトランスクリプトは不完全で,スタート地点で5'の末端と下流で3'の末端がある.
  • 短いRNAは一時停止したRNAポリメラーゼ (RNAP) に結びついているが,早期終了ではない.
  • Mtb RNAPの停止は σ-因子結合に依存する.
  • 翻訳リボソームはトランスクリプションの延長を促進し,トランスクリプションと翻訳のカップリングを示唆する.

結論:

  • MtbトランスクリプトームはRNAPの停止により不完全なトランスクリプトが特徴です.
  • RNAPの停止は,Mtbの適応のための重要な転写チェックポイントとして機能する.
  • この一時停止メカニズムは 新種の結核治療薬の標的となる可能性がある.