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アロステリーと内在的障害は,条件付きの協力性による転写調節を媒介する
Abel Garcia-Pino1, Sreeram Balasubramanian, Lode Wyns
1Structural Biology Brussels, Vrije Universiteit Brussels, Pleinlaan 2, B-1050 Brussels, Belgium. agarciap@vub.ac.be
Cell
|July 7, 2010
まとめ
phd/docの毒素-抗毒素システム
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:
- 毒素-抗毒素系は細菌の成長を調節し,プラズミドの安定性にとって極めて重要です.
- phd/doc システムは条件付きの協力性を示し,規制は Phd/Doc の比率に依存しています.
- この調節の基礎となる分子メカニズムは,未だに十分に理解されていない.
研究 の 目的:
- phd/docの毒素-抗毒素操作の条件付き協力性の背後にある分子メカニズムを解明する.
- 毒素Docが,その抗毒素Phdと相互作用して,転写を調節する方法を理解する.
主な方法:
- タンパク質とタンパク質の相互作用を研究するための生化学的測定法.
- 博士号と博士号の拘束モードを決定するための構造分析.
- 規制活動を評価するためのインビトロ転写アッセイ.
主要な成果:
- モノメリックドックは2つのPhDジメルの2つの異なる部位に結合します.
- DOC結合は,PhDのアロステリック構造変化を誘導し,そのDNA結合領域を構造化します.
- このアロステル結合は,Doc中和を転写調節と結びつける.
結論:
- この研究は,毒素-抗毒素システムにおける条件付きの協力性のための新しいアロステリックメカニズムを明らかにしています.
- DOCとPhDの相互作用は,DOCの蓄積がPhDの生成を誘発するまで,転写抑制を厳しくする.
- この規制モデルは,phd/docオペロンおよび潜在的に他の生物学的システムの機能的ダイナミクスに関する洞察を提供します.
関連する概念動画
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...
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...
Co-activators and Co-repressors
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
Co-activators and Co-repressors
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
Cooperative Allosteric Transitions
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

