γ-Glutamyl transpeptidase acylation with peptidic substrates: free energy relationships measured by an HPLC kinetic assay
作者:Mylène Morin、Caroline Rivard、Jeffrey W. Keillor
DOI:10.1039/b606914b
日期:——
γ-Glutamyl transpeptidase (GGT, EC 2.3.2.2) is a highly glycosylated heterodimeric enzyme linked to the external cellular membrane that catalyzes the hydrolysis of glutathione as well as the transfer of its γ-glutamyl group to amino acids and dipeptides in a transpeptidation reaction. The measurement of both the hydrolytic and transpeptidation activity of this important enzyme is a challenge, since its native substrates are not highly chromogenic. We have developed an HPLC-based method for the quantitative photometric detection of numerous enzyme substrates and products, after their pre-column derivation with dabsyl chloride. The broad applicability of this method was demonstrated in the kinetic investigation of transpeptidation reactions of rat kidney GGT with glutathione, its native substrate, as well as a series of pertinent glutathione analogues. The pH-rate profile constructed for glutathione confirmed the dependence on the ionisation state of at least two residues. Analysis of the free-energy relationships in the series of synthetic peptidic substrate analogues revealed the importance of enzymeâsubstrate interactions unrelated to amine leaving group basicity during the acylation step. These results are further interpreted in the context of the recently published structure for a similar GGT.
[DE] PYRAZOLINE ALS PAR-1-ANTAGONISTEN ZUR BEHANDLUNG VON HERZ-KREISLAUF-ERKRANKUNGEN<br/>[EN] PYRAZOLINES AS PAR-1 ANTAGONISTS FOR TREATMENT OF CARDIOVASCULAR DISEASES<br/>[FR] PYRAZOLINES UTILISEES COMME ANTAGONISTES PAR-1 POUR TRAITER DES MALADIES CARDIO-VASCULAIRES
申请人:BAYER HEALTHCARE AG
公开号:WO2005007157A1
公开(公告)日:2005-01-27
Die Erfindung betrifft Pyrazoline der Formel (I) in welcher E für Methylen, NH, ein Sauerstoffatom oder ein Schwefelatom steht, R2 für eine Gruppe der Formel (II) steht, und Verfahren zu ihrer Herstellung sowie ihre Verwendung zur Herstellung von Arzneimitteln zur Behandlung und/oder Prophylaxe von Krankheiten, insbesondere von Herz-Kreislauf-Erkrankungen, wie z.B. thromboembolischen Erkrankungen.
Direct Lewis Acid Catalyzed Conversion of Enantioenriched <i>N</i>-Acyloxazolidinones to Chiral Esters, Amides, and Acids
作者:Jason M. Stevens、Ana Cristina Parra-Rivera、Darryl D. Dixon、Gregory L. Beutner、Albert J. DelMonte、Doug E. Frantz、Jacob M. Janey、James Paulson、Michael R. Talley
DOI:10.1021/acs.joc.8b02451
日期:2018.12.7
enabled a unified protocol for the direct conversion of enantioenriched N-acyloxazolidinones to the corresponding chiral esters, amides, and carboxylic acids. This straightforward and catalytic method has shown remarkable chemoselectivity for substitution at the acyclic N-acyl carbonyl for a diverse array of N-acyloxazolidinone substrates. The ionic radius of the Lewis acid catalyst was demonstrated as a
Novel benzazepines and related heterocyclic derivatives which are useful as orexin receptor antagonists
申请人:——
公开号:US20040058912A1
公开(公告)日:2004-03-25
The invention relates to novel benzazepines and related heterocyclic derivatives (I) and their use as active ingredients in the preparation of pharmaceutical compositions. The invention also concerns related aspects including processes for the preparation of the compounds, pharmaceutical compositions containing one or more of those compounds and especially their use as orexin receptor antagonists.
.beta.-Adrenergic blocking agents. 18. 1-(Aryloxy)-3-(arylthioalkylamino)propan-2-ols and 1-substituted alkylthioamino-3-(aryloxy)propan-2-ols
作者:H. Tucker、J. F. Coope
DOI:10.1021/jm00206a010
日期:1978.8
The synthesis is described of a seris of derivaties of 1-(aryloxy)-3-(arylthioalkylamiho)propan-2-ols and 1-(alkylthioamino)- and 1-(aralkylamino)-3-(aryloxy)propan-2-ols. These compounds were investigated for their beta-adrenoreceptor blocking properties and their selectivity of action for the cardiac beta1 receptor. The structure-activity relationships are discussed with particular reference to the