2つのイミダゾールによるフォスフォディエステル水解の分子内触媒
Elisa S Orth1, Tiago A S Brandão, Bruno S Souza
1INCT-Catálise, Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil.
Journal of the American Chemical Society
|June 1, 2010
まとめ
イミダゾールの2つのグループは,フォスフォディエステル水解を触媒化する. この研究は,好ましい分子内核性および酸性触媒機構を明らかにし,フォスフォリパゼDスーパーファミリーの活動をモデル化しています.
科学分野:
- バイオケミストリー バイオケミストリー
- 有機化学 オーガニック・ケミストリー
- 化学カタリシス 化学カタリシス
背景:
- フォスフォリパゼD酵素は,細胞シグナル伝達と膜取引において極めて重要です.
- その触媒メカニズムを理解することは,医薬品開発と生化学研究にとって不可欠です.
- リン酸化エステルの水解は,生化学における基本的な反応である.
研究 の 目的:
- リン酸二酸化エステル溶解の触媒メカニズムの解明を,ビス ( bis) -2- ( bis) -1-メチル-1H-イミダゾリル (フェニル) リン酸 (BMIPP) によって行う.
- 運動的に似た2つの反応経路を区別する.
- フォスフォリファーゼDスーパーファミリーで使われているメカニズムの単純なモデルを確立する.
主な方法:
- コンピューター化学シミュレーション.
- 電気スプレー・イオン化タンデム質量スペクトロメトリー (ESI-MS/MS).
- 超質量スペクトロメトリー (LTQ-FT).
主要な成果:
- BMIPPの水解のための好ましい触媒経路を特定しました.
- 好ましいメカニズムは,イミダゾールグループによる分子内核性触媒である.
- これは,イミダゾリウム基からの分子内一般酸触媒によって助けられます.
結論:
- この研究は,フォスフォリパゼDスーパーファミリーの触媒メカニズムの最初の単純なモデルを提供します.
- この発見は,酵素触媒とフォスフォディエステル結合の分裂に関する洞察を提供します.
- この研究は,基本的な生化学的過程の理解に貢献します.
関連する概念動画
Aldehydes and Ketones with Amines: Imine Formation Mechanism
Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
Phosphodiester Linkages
Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
E2 Reaction: Kinetics and Mechanism
SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
Acid Halides to Esters: Alcoholysis
Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization
Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.
![Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F51444.jpg&w=3840&q=50)

