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Prokaryotic Gene Structure and Organization01:28

Prokaryotic Gene Structure and Organization

Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...
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...
Constitutive and Regulated Gene Expression01:27

Constitutive and Regulated Gene Expression

Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
Cis-regulatory Sequences02:02

Cis-regulatory Sequences

Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
Cis-regulatory Sequences02:02

Cis-regulatory Sequences

Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
Inducible Operons: lac Operon01:25

Inducible Operons: lac Operon

The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA (thiogalactoside...

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関連する実験動画

Updated: Jun 24, 2026

Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
11:12

Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

Published on: September 11, 2017

Escherichia coliにおける遺伝子発現のコード配列決定因子

Grzegorz Kudla1, Andrew W Murray, David Tollervey

  • 1Department of Biology and Program in Applied Mathematics and Computational Science, University of Pennsylvania, Philadelphia, PA 19104, USA.

Science (New York, N.Y.)
|April 11, 2009
PubMed
まとめ

同義変異は,コードンバイアスによってではなく,リボソーム結合部位近くのメッセンジャーRNA (mRNA) 折り畳みを変化させることによって遺伝子発現に影響を与えます. このmRNAの折り畳み安定性は,タンパク質レベルと翻訳開始率に大きな影響を与えます.

科学分野:

  • 分子生物学は分子生物学である.
  • 遺伝学 遺伝学とは
  • バイオケミストリー バイオケミストリー

背景:

  • タンパク質のアミノ酸配列を変更しない同義変異は,それでも遺伝子発現レベルに影響を与える可能性があります.
  • 同名変異が遺伝子発現に影響を与える正確なメカニズムは,完全に理解されていません.
  • これらのメカニズムを研究することは,遺伝子調節とタンパク質生産を理解するために不可欠です.

研究 の 目的:

  • 代名詞変異が遺伝子発現にどのように影響するかを調査する.
  • 同様のアミノ酸配列にもかかわらず,タンパク質のレベルの変化に寄与する要因を決定する.
  • 遺伝子発現におけるmRNAの安定性,折り畳み,コドンバイアスの役割を明らかにする.

主な方法:

  • ランダムな同名変異で同じ緑色光タンパク質 (GFP) をコードする154の遺伝子の合成ライブラリを設計した.
  • 合成遺伝子ライブラリがEscherichia coliで発現した.
  • 測定されたGFPタンパク質レベル,メッセンジャーRNA (mRNA) レベル,mRNAの分解率,バクテリアの成長率.
  • 遺伝子発現,mRNA折り畳み安定性,コドンバイアス,翻訳開始の間の相関を分析した.

主要な成果:

さらに関連する動画

Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing
09:44

Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing

Published on: December 23, 2022

Method for Labeling Transcripts in Individual Escherichia coli Cells for Single-molecule Fluorescence In Situ Hybridization Experiments
07:51

Method for Labeling Transcripts in Individual Escherichia coli Cells for Single-molecule Fluorescence In Situ Hybridization Experiments

Published on: December 21, 2017

関連する実験動画

Last Updated: Jun 24, 2026

Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
11:12

Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

Published on: September 11, 2017

Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing
09:44

Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing

Published on: December 23, 2022

Method for Labeling Transcripts in Individual Escherichia coli Cells for Single-molecule Fluorescence In Situ Hybridization Experiments
07:51

Method for Labeling Transcripts in Individual Escherichia coli Cells for Single-molecule Fluorescence In Situ Hybridization Experiments

Published on: December 21, 2017

  • GFPタンパク質のレベルは,図書館全体で250倍も変化していた.
  • mRNAレベル,分解パターン,バクテリアの成長率の有意な変動が観察されました.
  • コドンバイアスは遺伝子発現レベルと相関しませんでした.
  • リボソーム結合部位近くのmRNA折り畳み安定性は,タンパク質濃度の変動の50%以上を説明しています.
  • mRNAの折りたたみと翻訳開始率は,個々の遺伝子発現を形作る主要な要因として特定されました.

結論:

  • 同義変異は,コードンバイアスを超えたメカニズムを通じて遺伝子発現に大きく影響する.
  • リボソーム結合部位近くのmRNAの折り畳み安定性は,タンパク質レベルを決定する重要な要因です.
  • mRNA構造の影響を受ける翻訳開始率は,遺伝子発現において優位な役割を果たします.
  • コドンバイアスは,グローバルな翻訳効率と細胞フィットネスに影響しますが,mRNAの折り畳みは個々の遺伝子発現レベルにとって重要です.