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| {{MitoPedia
| | #REDIRECT[Complex IV] |
| |abbr=CIV
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| |description='''CIV''': Electron flow through [[Complex IV]] (cytochrome ''c'' oxidase) is measured in intact mitochondria after inhibiton of CIII by antimycin A, and addition of [[ascorbate]] (As) and the artificial substrate [[TMPD]] (Tm). Ascorbate has to be titrated first. It reduces [[TMPD]], which further reduces cytochrome ''c'', which is the substrate of CIV. Since CIV is a proton pump of the electron transfer-pathway, CIV-linked respiration (''L'', ''P'', and ''E'') can be measured in different coupling states. Measurement of CIV-activity requires uncoupler titrations to eliminate any potential control by the phosphorylation system, and a cytochrome ''c'' test to avoid any limitation by cytochrome ''c'' release. Total oxygen uptake in the ascorbate&TMPD(&c) stimulated state (Tm) has to be corrected for chemical background oxygen consumption.
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| |info=[[Electron transfer-pathway state]], [[Gnaiger 2002 Biochem Soc Trans]]
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| }}
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| {{MitoPedia concepts
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| |mitopedia concept=Respiratory state, SUIT state, Recommended
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| }}
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| {{MitoPedia topics
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| |mitopedia topic=EAGLE
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| }}
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| Communicated by [[Gnaiger E]] 2016-01-20; last edit 2019-06-30.
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| == CIV(L) ==
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| == CIV(P) ==
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| == CIV(E) ==
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| {{Template:Publications: Complex IV single step}}
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| {{Template:Abstracts: Complex IV single step}}
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