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.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 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.
Is plastocyanin an enzyme?
Plastocyanin is believed to work less like an enzyme where enzymes decrease the transition energy needed to transfer the electron. Plastocyanin works more on the principles of entatic states where it increases the energy of the reactants, decreasing the amount of energy needed for the redox reaction to occur.
Is plastoquinone a protein?
Of these, plastoquinone is a lipophilic molecule that accepts electron from photosystem II and passes to cytochrome b6f. Meanwhile, plastocyanin is a copper-containing water-soluble protein that accepts electrons from cytochrome b6f and passes to P700+ of photosystem I.
Which is a component of plastocyanin?
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.
Is plastocyanin lipid soluble?
A small, lipid soluble hydrocarbon molecule present within the thylakoid membrane (see Fig 7.27 in your text). PQ accepts electrons from PS II on the stromal side of the complex and delivers electrons to the cytochrome b6-f complex on the lumen side of the complex. Plastocyanin (PC).
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.
Is ferredoxin a protein?
Abstract. Under the name ferredoxin (Fd) are comprised ubiquitous, small proteins containing one or two iron–sulfur clusters. These prosthetic groups contain iron and sulfur atoms, organized in three different types of centers: 2Fe–2S, 4Fe–4 S, and 3Fe–4S.
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.