= Ubiquinone
{title2=$Q$}
<Ubiquinone> is a membrane-soluble quinone <electron> carrier with a hydrophobic isoprenoid side chain. <Reduction> of the quinone headgroup gives <ubiquinol>.
In the <mitochondrial respiratory chain>, movement within the membrane transfers reducing equivalents between <protein> complexes. The hydrophobic chain controls localization, while the headgroup carries out the redox chemistry.
<The Cell: A Molecular Approach, 2nd edition by Geoffrey M. Cooper>[Mitochondria: electron transport chain and coenzymeQ]{ref}
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