Umbelliferone aminoalkyl derivatives as inhibitors of oxidosqualene cyclases from <Emphasis Type="Italic">Saccharomyces cerevisiae,Tripanosoma cruzi</Emphasis>, and <Emphasis Type="Italic">Pneumocystis carinii</Emphasis> |
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Authors: | Simonetta?Oliaro-Bosso Franca?Viola Seiichi?Matsuda Giancarlo?Cravotto Silvia?Tagliapietra Email author" target="_blank">Gianni?BallianoEmail author |
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Affiliation: | (1) Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, 10125 Turin, Italy;(2) Departments of Chemistry and of Biochemistry and Cell Biology, Rice University, 77005 Houston, Texas;(3) Dipartimento di Scienza e Tecnologia del Farmaco, via P. Giuria, 9-10125 Torino, Italy |
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Abstract: | A series of umbelliferone aminoalkyl derivatives, previously studied as inhibitors of squalene-hopene cyclase, were tested
as inhibitors of yeast (Saccharomyces cerevisiae) oxidosqualene cyclase (OSC) and OSC from Trypanosoma cruzi and Pneumocystis carinii expressed in yeast. Enzymes from these pathogens were included in this study to provide a preliminary screening for antiparasitic
activity. Tests were carried out both on cell homogenates incubated with radiolabeled oxidosqualene and on spheroplasts incubated
with radiolabeled acetate. Derivatives bearing a methylallylamino group were the most effective on all of the three enzymes.
The P. carinii enzyme was the most susceptible to the action of the inhibitors, with IC50 values for almost all of them ranging from 0.1 to 1μM. The T. cruzi enzyme was appreciably inhibited (IC50 4–5 μM) only by derivatives bearing a methylallylaminoalkyl flexible chain. Results identify a particularly promising new
family of OSC inhibitors, for the development of novel antiparasitic agents. |
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