Thioredoxin is a protein involved in the regulation of some Calvin cycle enzymes

Question

Thioredoxin is a protein involved in the regulation of some Calvin cycle enzymes. Determine which of the following statements accurately describe the regulation of some enzymes by thioredoxin. Ferredoxin-thioredoxin reductase catalvzes the oxidation of thioredoxin. Ferredoxin transfers electrons from photosystem I to thioredoxin. Activated thioredoxin cleaves disulfide bonds in some Calvin cycle enzymes. Thioredoxin is in its reduced form when light is available Active thioredoxin has a disulfide bond between two cysteine residues One of the answers you chose is incorrect. Consider the function of the reductase

Explanation / Answer

Statements which describe the regulation are -

1. Ferredoxin transfers electrons from photosystem I to thioredoxin.

2.Activated thioredoxin cleaves disulfide bonds in some Calvin cycle enzymes

3.Thioredoxin is in its reduced form when light is available.

The first statement is wrong as oxidized thioredixin is reduced by ferredoxin in a reaction catalysed by ferredoxin-thioredoxin reductase

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