Targeting the gatekeeper residue in phosphoinositide 3-kinases
摘要:
A single residue in the ATP binding pocket of protein kinases-termed the gatekeeper-has been shown to control sensitivity to a wide range of small molecule inhibitors (Chem. Biol. 2004, 11, 691; Chem. Biol. 1999, 6, 671). Kinases that possess a small side chain at this position (Thr, Ala, or Gly) are readily targeted by structurally diverse classes of inhibitors, whereas kinases that possess a larger residue at this position are broadly resistant. Recently, lipid kinases of the phosphoinositide 3-kinase (PI3-K) family have become the focus of intense research interest as potential drug targets (Chem. Biol. 2003, 10, 207; Curr. Opin. Pharmacol. 2003, 3, 426). In this study, we identify the residue that corresponds structurally to the gatekeeper in PI3-Ks, and explore its importance in controlling enzyme activity and small molecule sensitivity. Isoleucine 848 of p110 alpha was mutated to alanine and glycine, but the mutated kinase was found to have severely impaired enzymatic activity. A structural bioinformatic comparison of this kinase with its yeast orthologs identified second site mutations that rescued the enzymatic activity of the 1848A kinase. To probe the dimensions of the gatekeeper pocket, a focused panel of analogs of the PI3-K inhibitor LY294002 was synthesized and its activity against gatekeeper mutated and wild-type p110 alpha was assessed. (c) 2005 Elsevier Ltd. All rights reserved.
Substituted arylmethyl phenyl ethers. 1. A novel series of 5-lipoxygenase inhibitors and leukotriene antagonists
作者:John H. Musser、Utpal R. Chakraborty、Stanley Sciortino、Robert J. Gordon、Atul Khandwala、Edward S. Neiss、Thaddeus P. Pruss、Richard Van Inwegen、Ira Weinryb、Stephen M. Coutts
DOI:10.1021/jm00384a017
日期:1987.1
compound, 2-[[3-(1-hydroxyhexyl)phenoxy]-methyl]quinoline (33), had an I50 of 0.12 microM in the rat PMN 5-LO assay and an I50 of 3.6 microM in the leukotriene-induced contraction of GP lung parenchymal strips, and it also showed 91% inhibition of SRS-A-mediated bronchospasm in the GP in vivo at 10 mg/kg, administered intraduodenally. Some of the compounds in this series were also leukotriene antagonists
Catalytic Asymmetric Inverse-Electron-Demand Oxa-Diels-Alder Reaction of In Situ Generated<i>ortho</i>-Quinone Methides with 3-Methyl-2-Vinylindoles
作者:Jia-Jia Zhao、Si-Bing Sun、Sai-Huan He、Qiong Wu、Feng Shi
DOI:10.1002/anie.201500215
日期:2015.4.27
The first catalytic asymmetric inverse‐electron‐demand (IED) oxa‐Diels–Alderreaction of ortho‐quinone methides, generated in situ from ortho‐hydroxybenzyl alcohols, has been established. By selecting 3‐methyl‐2‐vinylindoles as a class of competent dienophiles, this approach provides an efficient strategy to construct an enantioenriched chroman framework with three adjacent stereogenic centers in high
Method of catalytic crosslinking of polymers and two-pack composition used therein
申请人:ROHM AND HAAS COMPANY
公开号:EP0950669A2
公开(公告)日:1999-10-20
A method of crosslinking an oxidative polymer having oxidatively crosslinkable functional groups and a two-pack composition used therein. The oxidatively crosslinkable functional groups on the oxidative polymer are crosslinked by contacting the oxidative polymer with a catalytic amount of an oxidizing enzyme, such as horseradish peroxidase. The present invention is further directed to a two-pack coating composition which includes a polymeric component and a catalytic component, which are mixed together prior to use.