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Operons02:09

Operons

Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...
Cooperative Binding of Transcription Regulators02:13

Cooperative Binding of Transcription Regulators

Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
Operons02:09

Operons

Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...
Cooperative Binding of Transcription Regulators02:13

Cooperative Binding of Transcription Regulators

Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
Operon Model01:23

Operon Model

The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
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 18, 2026

A Novel Saturation Mutagenesis Approach: Single Step Characterization of Regulatory Protein Binding Sites in RNA Using Phosphorothioates
11:49

A Novel Saturation Mutagenesis Approach: Single Step Characterization of Regulatory Protein Binding Sites in RNA Using Phosphorothioates

Published on: August 21, 2018

オペレーター結合の親和性と特異性を高めるラムダ抑制器変異.

H C Nelson, R T Sauer

    Cell
    |September 1, 1985
    PubMed
    まとめ
    この要約は機械生成です。

    第2部位逆転では,ラムダ抑制剤のDNA結合親和性と特異性を高める突然変異が特定されました. これらの遺伝子改変は,抑制剤-DNAの相互作用を改善し,タンパク質-DNA結合機構の洞察を提供します.

    さらに関連する動画

    In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression
    08:54

    In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression

    Published on: March 29, 2019

    An Assay for Quantifying Protein-RNA Binding in Bacteria
    07:02

    An Assay for Quantifying Protein-RNA Binding in Bacteria

    Published on: June 12, 2019

    関連する実験動画

    Last Updated: Jun 18, 2026

    A Novel Saturation Mutagenesis Approach: Single Step Characterization of Regulatory Protein Binding Sites in RNA Using Phosphorothioates
    11:49

    A Novel Saturation Mutagenesis Approach: Single Step Characterization of Regulatory Protein Binding Sites in RNA Using Phosphorothioates

    Published on: August 21, 2018

    In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression
    08:54

    In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression

    Published on: March 29, 2019

    An Assay for Quantifying Protein-RNA Binding in Bacteria
    07:02

    An Assay for Quantifying Protein-RNA Binding in Bacteria

    Published on: June 12, 2019

    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:

    • ラムダ抑制タンパク質は,ウイルスのDNA複製を調節する.
    • タンパク質とDNAの相互作用を理解することは,分子生物学にとって極めて重要です.
    • セカンドサイトリバーションは,タンパク質の機能を研究する方法である.

    研究 の 目的:

    • オペレーターDNAに対するラムダ抑制体の結合親和性と特異性を高めるアミノ酸置換を特定する.
    • 抑制器-操作器の相互作用が増加した構造的基礎を調査する.

    主な方法:

    • イントラジェニック,セカンドサイト逆転変異遺伝子が採用されました.
    • 代用された浄化された抑制剤をDNA結合のために分析した.
    • 結合運動 (結合と分離率) を測定した.

    主要な成果:

    • セカンドサイト置換は,野生型と比較して3~600倍に抑制剤-オペレータDNA結合親和度を高めました.
    • アフィニティの強化は,より速いアソシエーションとより遅い解離率の結果でした.
    • アルファ2およびアルファ3ヘリクスの置換により,DNAの脊髄との新しい結合が形成された.
    • アルファ5ヘリクスの置換により,間接的にオペレータのアフィニティが増加しました.

    結論:

    • セカンドサイトリバーションは,タンパク質-DNA結合のための有益な変異を特定するのに有効です.
    • 特定のアミノ酸の置換は,直接的または間接的なメカニズムを通じて,抑制剤-オペレータの相互作用を大幅に強化することができます.
    • 構造的な洞察は,標的の改変がタンパク質-DNA結合親和性と特異性を最適化することを示唆しています.