関連する実験動画
Updated: Apr 20, 2026

08:59
Defining Substrate Specificities for Lipase and Phospholipase Candidates
Published on: November 23, 2016
15.7K
リン酸モノエステル水解の理論モデルと実験モデルの間の明らかな矛盾を解決する
Fernanda Duarte1, Johan Åqvist, Nicholas H Williams
1Department of Cell and Molecular Biology (ICM), Uppsala University , SE-751 24 Uppsala, Sweden.
Journal of the American Chemical Society
|November 26, 2014
まとめ
リン酸と硫黄酸の転移反応は,生化学において不可欠である. この研究は,リン酸塩と硫酸塩の異なる水解機構を明らかにし,理論モデルと実験モデルの間の長年の不一致を明らかにしました.
科学分野:
- バイオケミストリー バイオケミストリー
- 化学ダイナミクス 化学ダイナミクス
- コンピューティング・ケミストリー
背景:
- 酸塩と硫黄酸塩の転移反応は,多くの生化学的プロセスに不可欠である.
- 何十年にもわたる研究が,これらの反応の正確なメカニズム的な詳細に関するコンセンサスを生み出していない.
- p-ニトロフェニルリン酸,メチルリン酸,およびp-ニトロフェニル硫酸などのキーモデルシステムは,これらの転送を研究するために使用されます.
研究 の 目的:
- p-ニトロフェニルリン酸塩,メチルリン酸塩,およびp-ニトロフェニル硫酸塩の水解の詳細な比較理論的研究を行う.
- フォスフォリルとスルフリル転移反応のメカニズム的な詳細を解明する.
- 理論モデルと実験モデルの間の不一致を調和させる.
主な方法:
- 水解反応の比較理論的研究.
- 運動同位体効果の計算. 運動同位体効果の計算.
- 充電された種を安定させるために暗黙の溶解を含める.
主要な成果:
- フォスファートモノエステル水解のエネルギー的に似ているが,機械的に異なる経路が示されている.
- 溶剤補助経路が溶液中のp-ニトロフェニルリン酸塩の水解に支配的であることを特定しました.
- メチルフォスファート水解に対する基質補助メカニズム好みと,p-ニトロフェニル硫酸塩水解のための単一の実行可能な経路が明らかになった.
結論:
- フォスフォリルとスルフリル転移反応のための統一的な機構的枠組みを提供した.
- 結果は,実験的に測定された運動同位体効果と一致しています.
- これらの至るところに存在する生化学反応の理論モデルと実験モデルの間の不一致を調和させました.
関連する概念動画
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
4.7K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
4.7K
Hydrolysis of ATP
83.8K
The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids.
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine...
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine...
83.8K
Hydrolysis of ATP
8.4K
8.4K
Protein Kinases and Phosphatases
15.8K
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
15.8K
Phosphate Buffer
6.5K
The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
6.5K
Polyprotic Acids
35.4K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
35.4K

