Gossypol Inhibits Electron Transport and Stimulates ROS Generation in Yarrowia lipolytica Mitochondria
Anna Yu Arinbasarova, Alexander G Medentsev, Vladimir I Krupyanko*
Identifiers and Pagination:Year: 2012
First Page: 11
Last Page: 15
Publisher Id: TOBIOCJ-6-11
Article History:Received Date: 26/8/2011
Revision Received Date: 11/1/2012
Acceptance Date: 19/1/2012
Electronic publication date: 19/3/2012
Collection year: 2012
open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http: //creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
This work studied the effect of gossypol on the mitochondrial respiratory chain of Yarrowia lipolytica. The compound was shown to inhibit mitochondrial electron transfer and stimulate generation of reactive oxygen species. The inhibition kinetics in oxidation of various substrates (NADH, succinate, α-glycerophosphate and pyruvate + malate) by isolated mitochondria was investigated. Analysis of the kinetic parameters showed gossypol to inhibit two fragments of the mitochondrial electron transfer chain: a) between coenzyme Q and cytochrome b with KIIIi of 118.3 μM (inhibition by the noncompetitive type), and b) at the level of exogenous NADH dehydrogenase with of KIi 17.2 μM (inhibition by the mixed type).