Is plastocyanin a copper-containing protein?

Is plastocyanin a copper-containing protein?

Plastocyanin is a copper-containing protein that mediates electron-transfer. It is found in a variety of plants, where it participates in photosynthesis.

What type of protein is plastocyanin?

copper protein
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 an integral membrane protein?

Plastocyanin is a single strand protein, mw 10,500, that plays an integral part in photosynthesis. This protein has a copper center, consisting of one copper atom surrounded by two nitrogen bonds and two sulfur bonds.

What is the role of plastocyanin in the Z scheme model?

What is the role of plastocyanin in the Z-scheme model? It shuttles electrons between the cytochrome complex and photosystem I. Plastocyanin protein forms a link between photosystem II and photosystem I.

Is plastocyanin a mobile electron carrier?

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.

Is plastocyanin a Proton carrier?

Electrons are shuttled between the two photosystems via the cytochrome b6f (Cytb6f) complex by two mobile, low-molecular-weight carriers–plastoquinone and plastocyanin–while a proton gradient is generated across the membrane to drive an ATP synthase (see Fig. 1).

Where is plastocyanin present in thylakoid?

Plastocyanin is a soluble copper-containing protein present in the thylakoid lumen, which transfers electrons to photosystem I.

Is plastocyanin an electron carrier?

Plastocyanin is the long-range electron carrier between photosystem II and photosystem I in plants.

Is plastocyanin hydrophobic or hydrophilic?

In contrast, plastocyanin is always oriented with its hydrophobic patch toward cytochrome f. The complex was visualized using ensemble docking, showing that the encounter complex is stabilized by hydrophobic as well as electrostatic interactions.

How many electrons can Plastocyanin carry?

one-electron
Plastocyanin, or PC, is a one-electron carrier, soluble protein similar to cytochrome c in the mitochondria.

What element is present in Plastocyanin?

Is plastocyanin a cytochrome?

Plastocyanin and cytochrome c (6) are two soluble metalloproteins that act as alternative electron carriers between the membrane-embedded complexes cytochromes b (6) f and Photosystem I.

What is the copper site in plastocyanin?

The copper site in plastocyanin, with the four amino acids that bind the metal labelled. Plastocyanin was the first of the blue copper proteins to be characterised by X-ray crystallography. It features an eight-stranded antiparallel β-barrel containing one copper center.

What is the shape of the plastocyanin binding site?

Although the molecular surface of plastocyanins differs for plants, algae, and cyanobacteria, the structure of the copper binding site is generally conserved. The geometry of the copper binding site is described as a ‘distorted trigonal pyramidal’.

What is plastocyanin and what does it do?

Plastocyanin is a copper-containing protein that mediates electron-transfer. It is found in a variety of plants, where it participates in photosynthesis. The protein is a prototype of the blue copper proteins, a family of intensely blue-colored metalloproteins .

What ligands are involved in the copper binding site?

Bound to the copper center are four ligands: the imidazole groups of two histidine residues (His37 and His87), the thiolate of Cys84 and the thioether of Met92. The geometry of the copper binding site is described as a ‘distorted trigonal pyramidal’.