Thioredoxin is a protein involved in the regulation of some Calvin cycle enzymes. Determine which statements...
Thioredoxin is a protein involved in the regulation of some Calvin cycle enzymes. Determine which statements accurately describe the regulation of some enzymes by thioredoxin.
1) Ferredoxin-thioredoxin reductase catalyzes the reduction of thioredoxin.
2) Thioredoxin transfers electrons from photosystem II to ferredoxin.
3) Thioredoxin is in its reduced form when light is available.
4) Activated thioredoxin cleaves disulfide bonds in some Calvin cycle enzymes.
5) Active thioredoxin has a disulfide bond between two cycteine residues.
Homework Answers
- Thioredoxin is in its reduced form when light is available.
- Ferredoxin-thioredoxin reductase cayalyzes the reduction of thioredoxin.
- Reduced thioredoxin can cleave disulfide bonds in enzymes, activating certain Calvin cycle enzymes and inactivating some degradative enzymes.
So, option 1,3 and 4 are correct.
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