What does the word plastoquinone mean?
: a plant substance that is related to vitamin K and plays a role in photosynthetic phosphorylation.
What is the difference between plastoquinone and Plastocyanin?
Plastoquinone is an electron transporter that transports electron from photosystem II to cytochrome b6f. Plastocyanin, on the other hand, is a copper-containing electron carrier protein that accepts electrons from cytochrome b6f and passes to P700+ of photosystem I.
What is Pheophytin in biology?
Pheophytin is a form of chlorophyll a in which the magnesium ion is replaced by two hydrogen ions. It participates in the crucial step of converting light energy to chemical energy. From: pheophytin in A Dictionary of Biology »
Which element is constituent of plastoquinone and Plastocyanin?
The Copper Center Plastocyanin (PC) is a β-sheet protein (Figure 1) with a Cu atom that acts as the redox center. The Cu atom is coordinated to four amino acid residues (H87, H37, S84, and M92) in a distorted tetrahedral geometry.
What is Plastoquinone made up of?
Plastoquinone (PQ) is an isoprenoid quinone molecule involved in the electron transport chain in the light-dependent reactions of photosynthesis. The most common form of plastoquinone, known as PQ-A or PQ-9, is a 2,3-dimethyl-1,4-benzoquinone molecule with a side chain of nine isoprenyl units.
What is quinone and plastoquinone?
Plastoquinone (PQ) is an isoprenoid quinone molecule involved in the electron transport chain in the light-dependent reactions of photosynthesis. The benzoquinone and isoprenyl units are both nonpolar, anchoring the molecule within the inner section of a lipid bilayer, where the hydrophobic tails are usually found.
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.
What is another name for pheophytin?
Pheophytin or phaeophytin (abbreviated Pheo) is a chemical compound that serves as the first electron carrier intermediate in the electron transfer pathway of Photosystem II (PS II) in plants, and the type II photosynthetic reaction center (RC P870) found in purple bacteria.
What is the difference between chlorophyll and pheophytin?
Chlorophyll is a dominant pigment of fresh green tea leaves, while the pheophytin amount is very low. During the storage process, acidity increases, which causes the loss of the magnesium ion in the chlorophylls and produces an olive-brown solid (pheophytin) [4].
What is plastoquinone made up of?
Why is plastoquinone important?
Plastoquinone (PQ) and ubiquinone (UQ) are two important prenylquinones, functioning as electron transporters in the electron transport chain of oxygenic photosynthesis and the aerobic respiratory chain, respectively, and play indispensable roles in plant growth and development through participating in the biosynthesis …
What is the medical definition of plastoquinone?
medical Definition of plastoquinone. : any of a group of substances that occur mostly in plant chloroplasts, are related to vitamin K, and play a role in photosynthetic phosphorylation.
What does plastoquinone mean in the electron transport chain?
Freebase(0.00 / 0 votes)Rate this definition: Plastoquinone. Plastoquinone is a quinone molecule involved in the electron transport chain in the light-dependent reactions of photosynthesis. Plastoquinone is reduced, forming plastoquinol.
How is plastoquinone related to vitamin K?
Definition of plastoquinone : a plant substance that is related to vitamin K and plays a role in photosynthetic phosphorylation : any of a group of substances that occur mostly in plant chloroplasts, are related to vitamin K, and play a role in photosynthetic phosphorylation
Are there other types of plastoquinone Besides PQ-3?
There are other forms of plastoquinone, such as ones with shorter side chains like PQ-3 (which has 3 isoprenyl side units instead of 9) as well as analogs such as PQ-B, PQ-C, and PQ-D, which differ in their side chains.