Journal
CURRENT OPINION IN ELECTROCHEMISTRY
Volume 29, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.coelec.2021.100742
Keywords
Electron transport; Plastoquinone; Ubiquinone; Proton gradient; Chemiosmosis; Carbonaceous meteorites
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Plastoquinone and ubiquinone are essential in electron transport chains of chloroplasts and mitochondria by coupling electron transfer with proton movement. Quinone compounds found in carbonaceous meteorites may have been involved in primitive versions of electron transport by transporting protons.
Plastoquinone and ubiquinone play essential roles in the electron transport chains of chloroplasts and mitochondria by coupling electron transport to the transfer of protons across membranes. The energy of the resulting proton gradient is used to synthesize adenosine triphosphate (ATP), the energy currency of all life. How did quinones first become involved in this process? We have detected several quinone compounds in carbonaceous meteorites that can transport protons in a liposome model system. It is possible that such compounds were available to transport protons in primitive versions of electron transport in early life.
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