Catalase protects against nonenzymatic decarboxylations during photorespiration in Arabidopsis thaliana.

ABSTRACT: Photorespiration recovers carbon that would be otherwise lost following the oxygenation reaction of rubisco and production of glycolate. Photorespiration is essential in plants and recycles glycolate into usable metabolic products through reactions spanning the chloroplast, mitochondrion, and peroxisome. Catalase in peroxisomes plays an important role in this process by disproportionating H₂O₂ resulting from glycolate oxidation into O₂ and water. We hypothesize that catalase in the peroxisome also protects against nonenzymatic decarboxylations between hydrogen peroxide and photorespiratory intermediates (glyoxylate and/or hydroxypyruvate). We test this hypothesis by detailed gas exchange and biochemical analysis of Arabidopsis thaliana mutants lackin

SUBMITTER: Bao H 

PROVIDER: S-EPMC8688901 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature