Describe the role of proton pump in active transport of proton ions across plasma- membrane.
Proton pumps play a central role in the function of the tonoplast by generating a transmembrane H+ electrochemical gradient which can be utilized to drive the transport of solutes. The tonoplast contains different proton pumps, an ATPase and a PPase. VATPases (vacuolar-type) are present on different membranes of eukaryotic cells and is constituted of 13 subunits whereas tonoplast PPase is also an integral entity of the tonoplast and consists of one 80 kDa protein.
Transplasm membrane electron transport in both plant and animal cells activates proton release. The nature and components of the electron transport system and the mechanism by which proton release is activated remains to be discovered.
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