- high-resolution terminology - matching measurements at high-resolution
Complex IV single step
Description
[[Description::CIV is measured in intact mitochondria after inhibiton of CIII by antimycin A, and addition of ascorbate and the artificial substrate TMPD. Ascorbate has to be titrated first. It reduces TMPD, which further reduces cytochrome c, which is the substrate for cytochrome c oxidase (CIV). Since CIV is a proton pump of the electron transfer system, the single step of CIV-linked respiration can be measured in different coupling states: CIV(L), CIV(P), and CIV(E). 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.]]
Abbreviation: CIV
Reference: [[Info::Gnaiger 2002 Biochem Soc Trans]]
MitoPedia topics: Respiratory substrate-coupling state
