Abstract
Mitochondrial aconitase is a reversible enzyme that catalyzes the conversion of citrate to isocitrate in the tricarboxylic acid cycle. Mitochondrial aconitase is very sensitive to oxidative inactivation and can aggregate and accumulate in the mitochondrial matrix causing mitochondrial dysfunction. Lon protease, one of the major quality control proteases in mitochondria, degrades oxidized aconitase maintaining mitochondrial homeostasis. This chapter describes a step-by-step protocol for a simple and reliable measurement of mitochondrial aconitase, as well as citrate synthase activity, using isolated mitochondria from cells. The protocol is simple and fast, and it is optimized for a 96-well plate using a microplate reader.
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