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What is the mechanism of photorespiration?

What is the mechanism of photorespiration?

Mechanism of photorespiration: Photorespiration occurs usually when there is high concentration of oxygen. Under such circumstances, Rubisco, the enzyme that catalyses the carboxylation of RuBP during the first step of the Calvin cycle, functions as an oxygenase.

Why is photorespiration called Peroxisomal respiration?

phosphoglycolate is dephosphorylated and glycolate is formed. glycolate diffuses out of chloroplast and enters the organelles called peroxisome and enters and organelle called peroxisome. here it is oxidized and becomes called peroxisome. here it is oxidized and becomes glyoxylate.

What is happening during carboxylation?

a. The carboxylation reaction converts one 5 carbon molecule, RUBP, into two three carbon molecules, two 3-PGAs. The two important points to remember are: CO2 is “fixed” into an organic compound at this point, i.e. converted into carbohydrate.

What is the mechanism of Phosphohexose isomerase glucose 6-phosphate to fructose-6-phosphate?

The mechanism that GPI uses to interconvert glucose 6-phosphate and fructose 6-phosphate (aldose to ketose) consists of three major steps: opening the glucose ring, isomerizing glucose into fructose through an enediol intermediate, and closing the fructose ring.

What is photorespiration short answer?

Photorespiration is the chemical processes that occur within a living organism of phosphoglycolate that is produced during oxygenation catalyzed by the enzyme RubisCO and inhibits photosynthesis by interfering with CO2 fixation by RubisCO.

Is Calvin cycle a photorespiration?

Photorespiration is a wasteful pathway that occurs when the Calvin cycle enzyme rubisco acts on oxygen rather than carbon dioxide.

What is the role of peroxisome in photorespiration?

In photorespiration, peroxisome helps in oxidation of glycolate.

What is peroxisome in photorespiration?

Peroxisomes lie between chloroplasts and mitochondira in the plant cell and serve to pass the 2-carbon products of oxygenation on for further metabolism. In the chloroplast, the phosphoglycolate is dephosphorylated. Glycolate is transported to the peroxisome, where molecular oxygen further oxidizes it into glyoxylate.

Which enzyme is involved in carboxylation process?

ribulose bisphosphate carboxylase/oxygenase (Rubisco)
Carboxylation is catalyzed by ribulose bisphosphate carboxylase/oxygenase (Rubisco), which can constitute up to 50% of the soluble protein in a leaf and is probably the Earth’s most abundant protein.

What does Phosphohexose isomerase do in glycolysis?

Phosphohexose isomerase is also known as glucose phosphate isomerase and phosphoglucose isomerase. This enzyme catalyzes the interconversion of glucose-6-phosphate and fructose-6-phosphate in the Embden-Meyerhof pathway.

What is the function of Phosphohexose isomerase?

Phosphohexose isomerase (PHI) is a member of the ectoenzyme/exoenzyme family and plays a key role in both glycolysis and gluconeogenesis pathways. Upon secretion PHI acts as a cytokine with tumor autocrine motility factor (AMF), neuroleukin (NLK) and maturation factor (MF) functions.

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