What does glycolate oxidase do?
Glycolate oxidase (GOX) or hydroxyacid oxidase catalyzes the conversion of (S)-2-hydroxy acid and molecular oxygen to 2-oxo acid and hydrogen peroxide. In higher plants, GOX catalyzes the oxidation of glycolate to glyoxylate. GOX is part of the glyoxylate and dicarboxylate metabolism and uses FMN as a cofactor.
What is the glycolate cycle?
glycolate cycle A complex metabolic pathway, parts of which occur in the chloroplasts, mitochondria, and peroxisomes of plant cells. Its principal function is thought to be the formation of the amino acids serine and glycine from non-phosphorylated intermediates of the carbon reduction cycle of photosynthesis.
How many carbon atoms are present in glycolate?
This salvage pathway serves to recycle three of the four carbon atoms of two molecules of glycolate. However, one carbon atom is lost as CO2. This process is called photorespiration because O2 is consumed and CO2 is released.
What is Photorespiratory pathway?
The integrated pathway includes: ATP synthesis through light reaction in thylakoid membrane, RuBP carboxylation and synthesis of intermediates responsible for regeneration of RuBP, and starch synthesis through Calvin cycle in chloroplast stroma, Photorespiratory pathway which involves oxygenation of RuBP and production …
Why is photorespiration a problem?
Biochemical studies indicate that photorespiration consumes ATP and NADPH, the high-energy molecules made by the light reactions. Thus, photorespiration is a wasteful process because it prevents plants from using their ATP and NADPH to synthesize carbohydrates.
Is Photorespiration good or bad?
Photorespiration is bad for C3 plants because this process causes a decrease in the productivity of a plant, hence it is also called the wasteful process. Photorespiration is a respiratory process in many higher plants.
Where are Glyoxysomes located?
Glyoxysomes are specialized peroxisomes found in plants (particularly in the fat storage tissues of germinating seeds) and also in filamentous fungi. Seeds that contain fats and oils include corn, soybean, sunflower, peanut and pumpkin.
Does C3 plants have PEPCase?
The function of PEPCase is the addition of bicarbonate to phosphoenolpyruvate to form four carbon oxaloacetate and inorganic phosphate. Complete answer: C3 plants are those plants that utilise the C3 carbon fixation pathway for the fixation of carbon into sugars. Thus only C4 plants possess PEPCase and not C3 plants.