Question

The three electron-transporting complexes of the thylakoid membrane can be called plastocyanin–ferredoxin oxidoreductase, plastoquinone– plastocyanin oxidoreductase, and water–plastoquinone oxidoreductase. What are the common names of these enzymes and in what order do they act?

Short answer

The common name ofplastocyanin-ferredoxin oxidoreductase is PS I,plastoquinone-plastocyanin oxidoreductase is cytochrome b₆f, and that of water-plastoquinone oxidoreductase is PS II. The order in which they act is: $PSII$, cytochrome $b_{\mathit{6}}f$, $PSI$ .

Step-by-step solution

Definition of plastocyanin

Plastocyanin is a copper-containing protein that helps electrons move between cells. It may be found in a wide range of plants, where it aids in photosynthesis.The protein is a prototype of the blue copper proteins, a class of metalloproteins with a deep blue hue.

The common name of the enzymes and the act.

The thylakoid membrane contains three electron-transporting complexes: plastocyanin-ferredoxin oxidoreductase, plastoquinone-plastocyanin oxidoreductase, and water-plastoquinone oxidoreductase.

They occur in the following locations: $I$and $II$photosystems, as well as cytochrome $b_{\mathit{6}}f$ .

The electron-transporting complexes, along with their common names in the sequence of their action, are as follows:

1. water-plastoquinone oxidoreductase enzyme (Photosystem$II$)

2. plastoquinone-plastocyanin oxidoreductase(cytochrome$b_{\mathit{6}}f$)

3. plastocyanin-ferredoxin oxidoreductase (Photosystem $I$)