Sandbox 143: Difference between revisions
| Line 16: | Line 16: | ||
===Context=== | ===Context=== | ||
In the sunlight reaction, in photosynthesis, the plastocyanin is an important electron donor to the Photosystem I (P700) | In the sunlight reaction, in photosynthesis, the plastocyanin is an important electron donor to the Photosystem I (P700).Thanks to its hydrophobic surface, plastocyanin is localised in the intern membrane of the thylakoid in chloroplasts. Its redox potential, about 370 mV, has allowed to determine the place of plastocyanin in the electron transport chain (between the photosystem II to the photosystem I): between the cytochrome b6f complex and the phtosystem I. | ||
Plastocyanin receive an electron from the cytochrome b6f complex and give up its electron to the photosystem I. | |||
===Electron Transfer Mechanism=== | ===Electron Transfer Mechanism=== | ||
Revision as of 13:13, 23 December 2011
Plastocyanin from a Green Alga, Enteromorpha prolifera
|
Please do NOT make changes to this sandbox. This sandbox is currently reserved , ESBS for use of Protopedia project. Bichelberger and Raphalen
OverviewOverview
Plastocyanin is an important copper-containing protein involved in photosynthesis by all higher plants and some algae namely by Enteromorpha prolifera. Plastocyanin extracted from this alga, was the first alga blue copper protein characterized by X-ray crystallography and one of the best characterized electron transfer protein of the photosynthetic apparatus. This protein was intensively studied between 1981 and 1994 because of these particular spectroscopic and electronic properties. The high resolution structural analysis by molecular replacement in 19891 provided an accurate description of the structure of this protein. Plastocyanin is an electron donor localized in the intern membrane of thylakoïd in chloroplast. This is a monomeric protein with a single polypeptide chain of 98 amino acids and one copper atom. The molecular weight of plastocyanin is around 10,500 Daltons.
Role in PhotosynthesisRole in Photosynthesis
ContextContext
In the sunlight reaction, in photosynthesis, the plastocyanin is an important electron donor to the Photosystem I (P700).Thanks to its hydrophobic surface, plastocyanin is localised in the intern membrane of the thylakoid in chloroplasts. Its redox potential, about 370 mV, has allowed to determine the place of plastocyanin in the electron transport chain (between the photosystem II to the photosystem I): between the cytochrome b6f complex and the phtosystem I. Plastocyanin receive an electron from the cytochrome b6f complex and give up its electron to the photosystem I.