Week 7: Pentose Phosphate Pathway Flashcards Quizlet Glutathione is an important antioxidant in plants, animals, fungi, and some bacteria and archaea. Take the time and learn more about it right here! Reductive Stress Causes Oxidative Stress: Antioxidants, Oxidative Stress and Reductive Stress Fire In A Bottle Item Scheme showing the enzymatic reactions that catalyze the pyruvate dehydrogenase complex, including pyruvate dehydrogenase activity and diaphorase activity of DLD (A) as well as the glutathione reductase peroxidase activity (B).