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Document<br />

Page 388<br />

nosine proved to inhibit the parasite more than fifty times better than the human enzyme. Additionally,<br />

<strong>by</strong> means of the program DOCK, eight new leads for GAPDH inhibition were found. None of them<br />

were micromolar inhibitors but all of them were more potent than the natural lead, adenosine. For<br />

trypanosomal PGK a potent lead compound, SPADNS, was discovered <strong>by</strong> testing inhibitors that had<br />

been described as weak inhibitors of yeast PGK. Moreover, this lead had no effect on mammalian PGK<br />

at concentrations up to twenty-five times higher than that needed for T. brucei inhibition. At present,<br />

none of our inhibitors is potent enough to consider clinical tests. There is hope, however, since our<br />

GAPDH inhibitors inhibit the growth of trypanosomes in cultures.<br />

Acknowledgments<br />

It is a pleasure to thank the many colleagues and collaborators who have contributed to this project: Paul<br />

Michels, Veronique Hannaert, Sylvie Allert, and Linda Kohl (Institute for Cellular Pathology in<br />

Brussels) for cloning and overexpressing trypanosomatid enzymes; Phil Petra (University of<br />

Washington, Seattle) for helping us out with protein purification protocols; Mia Callens and Fred<br />

Opperdoes (Institute for Cellular Pathology in Brussels) for enzymology and parasitology; Rik<br />

Wierenga, Martin Noble, Fred Vellieux, Randy Read, Risto Lapatto, Hillie Groendijk, Tjaard Pijning,<br />

and Kor Kalk for laying the structural foundation of the project in Groningen and Heidelberg; Cees<br />

Witmans and the late Alan Horn (University of Groningen), Michèle Willson and Jacques Perié<br />

(University of Toulouse), Serge Van Calenbergh, Arthur Van Aerschot, and Piet Herdewijn (University<br />

of Leuven) for synthesizing TIM and GAPDH inhibitors; Kim Simons (University of Washington) for<br />

going after completely new GAPDH inhibitors; Véronique Mainfroid and Joseph Martial (University of<br />

Liège) for providing human TIM; Klaus Muml;uller and Klaus Gubernator (Hoffmann-La Roche, Basel)<br />

for valued modeling advice; and Mike Gelb (University of Washington) for valued discussions.<br />

Financial support for these investigations has been provided <strong>by</strong> the World Health Organization,<br />

Hoffmann-LaRoche in Basel, the Dutch Organization for the Advancement of Science (NWO), the STD<br />

program of the European Community, the School of Medicine of the University of Washington, and the<br />

Murdock Charitable Trust.<br />

Note Added in Proof<br />

We just solved the ternary structure of PGK from Trypanosoma brucei in complex with ADP and 3phosphoglycerate.<br />

The enzyme is in the closed conformation that has eluded crystallographers for 20<br />

years.<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_388.html [4/5/2004 5:42:18 PM]

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