Showing papers by "Michael Hennig published in 2004"
TL;DR: The target protein with an inhibitor that showed cholesterol lowering in vivo opens the way for the structure-based design of new OSC inhibitors, and the complex with the reaction product lanosterol gives a clear picture of the way in which the enzyme achieves product specificity in this highly exothermic cyclization reaction.
Abstract: In higher organisms the formation of the steroid scaffold is catalysed exclusively by the membrane-bound oxidosqualene cyclase (OSC; lanosterol synthase). In a highly selective cyclization reaction OSC forms lanosterol with seven chiral centres starting from the linear substrate 2,3-oxidosqualene. Valuable data on the mechanism of the complex cyclization cascade have been collected during the past 50 years using suicide inhibitors, mutagenesis studies and homology modelling. Nevertheless it is still not fully understood how the enzyme catalyses the reaction. Because of the decisive role of OSC in cholesterol biosynthesis it represents a target for the discovery of novel anticholesteraemic drugs that could complement the widely used statins. Here we present two crystal structures of the human membrane protein OSC: the target protein with an inhibitor that showed cholesterol lowering in vivo opens the way for the structure-based design of new OSC inhibitors. The complex with the reaction product lanosterol gives a clear picture of the way in which the enzyme achieves product specificity in this highly exothermic cyclization reaction.
305 citations
TL;DR: The influence of aromatic substitution on a newly discovered class of inhibitors of dipeptidyl peptidase IV was investigated and a 10(5)-fold increase in potency was achieved by the optimization of aromatic substituents in a parallel chemistry program.
94 citations
Patent•
03 Feb 2004
TL;DR: In this article, a novel polymorph of [6,7-Bis(2-methoxy-ethoxy)-quinazolin-4-yl]-(3-ethynyl-phenyl)amine hydrochloride is presented.
Abstract: The invention is concerned with a novel polymorph of [6,7-Bis(2-methoxy-ethoxy)-quinazolin-4-yl]-(3-ethynyl-phenyl)amine hydrochloride. This polymorph exhibits superior properties compared to the previously known forms of [6,7-Bis(2-methoxy-ethoxy)-quinazolin-4-yl]-(3-ethynyl-phenyl)amine hydrochloride. The [6,7-Bis(2-methoxy-ethoxy)-quinazolin-4-yl]-(3-ethynyl-phenyl)amine hydrochloride is an inhibitor of tyrosine kinase enzymes, and are useful in the treatment of cancer. Also disclosed are methods of making and using the novel polymorph, as well as pharmaceutical compositions containing the novel polymorph.
13 citations
Patent•
11 Feb 2004TL;DR: In this article, a novel polymorph of [6,7-Bis(2methoxy-ethoxy)-quinazolin-4-yl]-(3-ethynyl-phenyl)amine hydrochloride was proposed.
Abstract: The invention is concerned with a novel polymorph of [6,7-Bis(2-methoxy-ethoxy)-quinazolin-4-yl]-(3-ethynyl-phenyl)amine hydrochloride. This polymorph exhibits superior properties compared to the previously known forms of [6,7-Bis(2-methoxy-ethoxy)-quinazolin-4-yl]-(3-ethynyl-phenyl)amine hydrochloride and can be used as medicament for the treatment of hyperproliferative disorders.
9 citations
8 citations