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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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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...
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Cooperative Allosteric Transitions01:58

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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Switching of BJT01:22

Switching of BJT

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
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Conservative Site-specific Recombination and Phase Variation02:53

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Allosteric Regulation01:08

Allosteric Regulation

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Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
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DNA Sequence Recognition by DNA Primase Using High-Throughput Primase Profiling
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Allosteric スイッチは,シーケンス固有のDNA認識を優先する.

Matthew J Walker1, Gabriele Varani1

  • 1Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA.

Cell
|January 12, 2019
PubMed
まとめ
この要約は機械生成です。

研究者はタンパク質とDNAの結合特異性を 制御する新しい方法を発見しました アルカイウカリオット・プライマースのATP誘発の構造スイッチがDNA認識を制御する.

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Split Hybridization Probe Utilizing a DNA Fluorescent Light-up Aptamer as a Signal Reporter for Sequence-Specific Nucleic Acid Analysis
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関連する実験動画

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DNA Sequence Recognition by DNA Primase Using High-Throughput Primase Profiling
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Split Hybridization Probe Utilizing a DNA Fluorescent Light-up Aptamer as a Signal Reporter for Sequence-Specific Nucleic Acid Analysis
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科学分野:

  • 生物化学
  • 分子生物学
  • 遺伝学

背景:

  • タンパク質とDNAの相互作用は 細胞のプロセスに不可欠です
  • これらの相互作用の特異性は,様々なメカニズムによって厳格に規制されています.
  • アルカイウカリオット・プライマースはDNA複製の開始に重要な役割を果たします.

研究 の 目的:

  • タンパク質とDNAの結合特異性を調節する新しいメカニズムを調査する.
  • アロステル調節が古核生物プリマースによるDNA認識における役割を明らかにする.

主な方法:

  • タンパク質の構成を分析する構造生物学技術.
  • DNA結合の親和性と特異性を評価する生化学的測定法
  • 浄化されたアルカイウカリオット・プライマースを用いた in vitro 研究

主要な成果:

  • 古代エウカリオット・プライマースにおけるATP誘発性アロステリックスイッチの発見.
  • この構造の変化は 特定のDNA認識を媒介します
  • 発見は,特異性の規制の新しい層を明らかにします.

結論:

  • アロステル調節は,タンパク質とDNAの結合特異性を制御する重要なメカニズムである.
  • 特定されたATP誘発スイッチは,プライマース機能を理解するためのモデルを提供します.
  • この発見により 古代生物の 分子認識に関する知識が 広がりました