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cytochrome b
Cytochrome b is a protein found in the mitochondria of eukaryotic cells. It functions as part of the electron transport chain and is the main subunit of transmembrane cytochrome bc1 and b6f complexes.
== Function ==
In the mitochondrion of eukaryotes and in aerobic prokaryotes, cytochrome b is a component of respiratory chain complex III () - also known as the bc1 complex or ubiquinol-cytochrome c reductase. In plant chloroplasts and cyanobacteria, there is an analogous protein, cytochrome b6, a component of the plastoquinone-plastocyanin reductase (), also known as the b6f complex. These complexes are involved in electron transport, pumping of protons to the create a PMF. The proton gradient is finally used for the generation of ATP. Concluding, the complexes play a vital part in cells.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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