Editing Electron transport chain (section)

=== Quinone carriers ===
[[Quinone]]s are mobile, lipid-soluble carriers that shuttle electrons (and protons) between large, relatively immobile macromolecular complexes embedded in the membrane. Bacteria use [[ubiquinone]] (Coenzyme Q, the same quinone that mitochondria use) and related quinones such as [[menaquinone]] (Vitamin K{{sub|2}}). Archaea in the genus ''[[Sulfolobus]]'' use caldariellaquinone.<ref>{{EC number|1.3.5.1}}</ref> The use of different quinones is due to slight changes in redox potentials caused by changes in structure. The change in redox potentials of these quinones may be suited to changes in the electron acceptors or variations of redox potentials in bacterial complexes.<ref>{{cite journal | vauthors = Ingledew WJ, Poole RK | title = The respiratory chains of Escherichia coli | journal = Microbiological Reviews | volume = 48 | issue = 3 | pages = 222–71 | date = September 1984 | pmid = 6387427 | pmc = 373010 | doi = 10.1128/mmbr.48.3.222-271.1984 | doi-access = free }}</ref>