Related Experiment Video
Updated: Aug 21, 2026

Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
Published on: February 24, 2018
Regulation of branched-chain 2-oxo acid dehydrogenase activity during exercise
1Department of Biochemistry, School of Medicine, East Carolina University, Greenville, North Carolina 27858.
Abstract:
The levels of the branched-chain amino and oxo acids were measured in muscle and plasma after exercise and 10 min postexercise. Leucine was increased in both muscle and plasma after exercise and 10 min postexercise. The muscle levels of the branched-chain oxo acids were not increased immediately after exercise but were increased 10 min postexercise. Exercise caused a large increase in the plasma levels of the oxo acids of leucine and isoleucine that was further increased 10 min postexercise. The activity of branched-chain 2-oxo acid dehydrogenase (BCOAD) was increased immediately after exercise but returned to the control value by 10 min postexercise. The lack of correlation between the muscle and plasma levels of the branched-chain amino and oxo acids and BCOAD activity suggests that these amino and oxo acids are not the primary physiological regulators of BCOAD activity during exercise. On the other hand, an excellent correlation was found between the muscle ATP level and BCOAD activity, with the ATP content decreasing in tandem with an increase in BCOAD activity during exercise and decreasing during the recovery period after exercise.
Related Concept Videos
Pyruvate Oxidation
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
The Citric Acid Cycle: Overview
The citric...
Electron Transport Chain: Complex I and II
ROS generation is regulated and maintained at moderate levels necessary...
The Electron Transport Chain
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q in...
Electron Transport Chain: Complex III and IV
Muscle Recovery and Fatigue

