Difference Between Plastoquinone and Plastocyanin

The key difference between plastoquinone and plastocyanin is that plastoquinone is a lipophilic carrier molecule that transfers electrons to plastocyanin through cytochrome b6f protein complex. ... Photosystems are large complexes of proteins and pigments or light-absorbing molecules. They capture energy from sunlight.

1. What is Plastoquinone Plastocyanin?
2. What is the function of Plastoquinone and Plastocyanin?
3. What is the role of Plastoquinone?
4. Is Plastoquinone a BA hydrogen carrier?
5. Where is Plastoquinone found?
6. Where is Plastocyanin found?
7. Is Plastocyanin a mobile?
8. Why is it called cyclic Photophosphorylation?
9. Is Plastocyanin a protein?
10. Is Plastoquinone an electron carrier?
11. Why is ferredoxin important?
12. What does cytochrome mean?

What is Plastoquinone Plastocyanin?

Cytochrome b₆f has two plastoquinone binding sites — PQc and PQ_Z. The plastoquinone at PQz reduces cytochrome f via the Rieske protein. ... Plastocyanin is a small water-soluble blue-copper protein that transfers electrons from cytochrome b₆f to photosystem I in the thylakoid space.

What is the function of Plastoquinone and Plastocyanin?

Within photosystem II

The protonated Q_B then joins a pool of free plastoquinone molecules in the membrane of the thylakoid. The free plastoquinone molecules eventually transfer electrons to the water-soluble plastocyanin so as to continue the light-dependent reactions.

What is the role of Plastoquinone?

Plastoquinone is one of the electron acceptors associated with Photosystem II in photosynthesis. It accepts two electrons and is reduced to Plastoquinol and as such acts as an electron and energy carrier in the electron transport process.

Is Plastoquinone a BA hydrogen carrier?

Cytochrome b, cytochrome c and cytochrome c1 are also involved in the electron transport chain but they do not carry out proton translocation and hence do not act as hydrogen carriers.

Where is Plastoquinone found?

Plastoquinone (PQ) and ubiquinone (UQ) are two important prenylquinones functioning as electron transporters in plants. They are involved in photophosphorylation and oxidative phosphorylation located in chloroplast thylakoids and mitochondrial inner membrane, respectively (Swiezewska, 2004).

Where is Plastocyanin found?

Plastocyanin is a 10 kD blue copper protein which is located in the lumen of the thylakoid where it functions as a mobileelectron carrier shuttling electrons from cytochromef to P700 in Photosystem I.

Is Plastocyanin a mobile?

For thylakoid membranes of higher plants, a long-standing question has been which of the two mobile electron carriers, plastoquinone or plastocyanin, mediates electron transport from stacked grana thylakoids where photosystem II (PSII) is localized to distant unstacked regions of the thylakoids that harbor PSI.

Why is it called cyclic Photophosphorylation?

The photophosphorylation process which results in the movement of the electrons in a cyclic manner for synthesizing ATP molecules is called cyclic photophosphorylation. This downward movement of electrons from an acceptor to P700 results in the formation of ATP molecules. ...

Is Plastocyanin a protein?

Plastocyanin (Pc) is a copper (Cu)-containing blue protein, that functions as a mobile electron carrier between cytochrome (cyt) f and Photosystem 1 (PS1) in oxygenic organisms.

Is Plastoquinone an electron carrier?

Plastoquinone (PLQ) acts as an electron carrier between photosystem II (PSII) and the cytochrome b₆f complex.

Why is ferredoxin important?

Ferredoxin - NADP⁺ Reductase

Ferredoxin is a small, iron-containing protein which acts as the electron acceptor associated with Photosystem I in photosynthesis. It accepts an electron and is reduced, giving it the capacity to pass on those electrons as part of the electron transport process.

What does cytochrome mean?

: any of several intracellular hemoprotein respiratory pigments that are enzymes functioning in electron transport as carriers of electrons.