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Leaky Scanning02:28

Leaky Scanning

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 stands for...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
The Replisome03:01

The Replisome

DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
Translation in Prokaryotes01:29

Translation in Prokaryotes

Prokaryote translation is a complex, highly coordinated process that converts genetic information from mRNA into functional proteins. It involves three stages: initiation, elongation, and termination, each facilitated by specific molecular components.Initiation of TranslationThe process begins with the assembly of the ribosomal subunits and initiation factors on the mRNA. In bacteria, the 30S ribosomal subunit recognizes the Shine-Dalgarno sequence in the mRNA, a conserved region upstream of...
Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
Viral Replication: Lysogenic Cycle01:16

Viral Replication: Lysogenic Cycle

The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects its...

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Updated: May 11, 2026

Following Cell-fate in E. coli After Infection by Phage Lambda
06:10

Following Cell-fate in E. coli After Infection by Phage Lambda

Published on: October 14, 2011

プロファージ・ラムダ・CLトランスクリプトの翻訳

C S Shean1, M E Gottesman

  • 1Institute of Cancer Research, Columbia University College of Physicians and Surgeons, New York, New York 10032.

Cell
|August 7, 1992
PubMed
まとめ
この要約は機械生成です。

リボソームタンパク質S2に影響する突然変異は,特定のRNA配列との相互作用を改善することにより,遺伝子翻訳を強化する. この発見は,細菌における遺伝子発現の調節に光を当てている.

さらに関連する動画

Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'
08:31

Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'

Published on: May 26, 2013

The Lambda Select cII Mutation Detection System
07:08

The Lambda Select cII Mutation Detection System

Published on: April 26, 2018

関連する実験動画

Last Updated: May 11, 2026

Following Cell-fate in E. coli After Infection by Phage Lambda
06:10

Following Cell-fate in E. coli After Infection by Phage Lambda

Published on: October 14, 2011

Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'
08:31

Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'

Published on: May 26, 2013

The Lambda Select cII Mutation Detection System
07:08

The Lambda Select cII Mutation Detection System

Published on: April 26, 2018

科学分野:

  • 分子生物学は分子生物学である.
  • バクテリア学 バクテリア学
  • 遺伝学 遺伝学とは

背景:

  • バクテリアの遺伝子発現は,翻訳レベルで厳しく規制されています.
  • リボソームタンパク質S2は,翻訳の開始と効率化に役割を果たします.
  • ラムダファグの cl 遺伝子は,リンソ生成の維持に不可欠です.

研究 の 目的:

  • ラムダファグCl遺伝子の翻訳におけるリボソームタンパク質S2の役割を調査する.
  • 強化翻訳に関与する cl トランスクリプトの配列特性を識別する.
  • S2欠乏が翻訳に影響を与えるメカニズムを解明する.

主な方法:

  • ラムダ・リゾーゲンにおけるrpsB変異の遺伝子解析.
  • 30Sリボソームサブユニットを用いたRNA-タンパク質相互作用の研究.
  • リーダー配列と下流ボックスを含む cl トランスクリプトの特徴の分析.

主要な成果:

  • rpsBの変異により,リボソームタンパク質S2のレベルが低下し,cl翻訳が強化される.
  • 強化翻訳には,リーダーシーケンスがないことと,clトランスクリプトにダウンストリームボックスの存在が必要です.
  • S2が欠けている30Sリボソームサブユニットは,clトランスクリプトへの結合効率を高めています.

結論:

  • 低レベルのリボソームタンパク質S2は,ラムダリンソゲンにおけるCl翻訳を促進する.
  • CLトランスクリプトのダウンストリームボックスとリーダーの欠如は,S2媒介による翻訳強化に不可欠です.
  • S2欠乏は16S rRNAの構造を変化させ,cl下流ボックスの結合を改善し,翻訳を向上させる.