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C–C Bond Cleavage: Retro-Aldol Reaction00:57

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The reverse of the aldol addition reaction is called the retro-aldol reaction. Here, the carbon–carbon bond in the aldol product is cleaved under acidic or basic conditions to form two molecules of carbonyl compounds. The mechanism of the reaction consists of three steps.
In the first step, as depicted in Figure 1, the base deprotonates the β-hydroxy ketone at the hydroxyl group to form an alkoxide ion.
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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to  N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
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Base-Catalyzed Aldol Addition Reaction01:08

Base-Catalyzed Aldol Addition Reaction

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As depicted in Figure 1, base-catalyzed aldol addition involves adding two carbonyl compounds in aqueous sodium hydroxide to form a β-hydroxy carbonyl compound.
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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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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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設計されたレトロアルドラーゼの遠隔変異は,ループダイナミクスを変化させ,速度制限ステップを加速する.

Serena E Hunt1,2, Cindy Klaus1,2, Aqza E John3

  • 1Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada.

Journal of the American Chemical Society
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PubMed
まとめ

活性部位からの遠隔の酵素の変異は,活性部位の変異と組み合わせると,触媒効率を高めます. これらの遠端残基は,酵素構造と動力学に影響を与えることで,酵素設計に極めて重要です.

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科学分野:

  • 酵素触媒
  • タンパク質工学
  • 生物化学

背景:

  • 酵素の活性部位から離れているアミノ酸残留は,触媒作用に影響を与えるが,そのメカニズムは不明である.
  • 誘導進化と計算設計は 酵素工学の強力なツールです

研究 の 目的:

  • レトロアルドラーゼRA95におけるディスタルおよびアクティブサイト変異の構造的,機能的,およびメカニズム的影響を調査する.
  • 酵素触媒と活性部位のダイナミクスの作用を明らかにする.

主な方法:

  • レトロアルドラーゼRA95の指向的な進化
  • X線結晶学と分子ダイナミクスシミュレーション
  • 溶媒の運動粘度効果と電場計算

主要な成果:

  • アクティブサイト変異は,触媒効率を3,600倍改善したが,ディスタル変異だけでは改善はなかった.
  • アクティブサイトとディスタル変異の組み合わせにより,効率がさらに6倍に増加しました (epistasis).
  • 遠隔変異はループのダイナミクスを変化させ 化学的変換を100倍に加速します

結論:

  • ディスタル残基は,酵素の活性部位環境を形作る上で重要な役割を果たします.
  • ディスタル変異は,効率的な酵素触媒のための重要な構造的ダイナミクスを促進します.
  • この発見は 触媒特性を持つ酵素の合理的な設計に 価値ある洞察をもたらします