- high-resolution terminology - matching measurements at high-resolution
Cyanide
Description
Cyanide (usually added as KCN) is a competitive inhibitor of cytochcrome c oxidase (CIV). Inhibition is reversed by pyruvate and high oxygen levels.
Abbreviation: KCN
Reference: MiPNet09.12
MitoPedia topics: Inhibitor
Application in HRR
Last update 2021-01-22
Inhibitor titrations, CIV-assay, alternative oxidase and ROX
- Cyanide and determination of residual oxygen consumption (ROX).
- Complex IV assay
- alternative oxidase
- Caution: Due to a confusion, a change in the procedure for preparing the KCN was done in April 2019 that recommended to prepare 20 mM KCN stock and titrate 100 µl. This now have been corrected to our previous recommendation of 1 M KCN stock solutions
Preparation of KCN stock
- Kcn(KCN): Fluka 60178, 100 g, store at R.T.; FW = 65.12.
- Caution: KCN is photosensitive and hygroscopic; KCN is volatile and very toxic!
- Preparation of 1 M KCN stock solution for 2-mL O2k-chamber
- Weigh 13 mg of KCN.
- Dissolve in 0.2 ml H2O.
- The pH of the solution may be very alkaline - adjust to physiological pH with HCl.
- » O2k manual titrations MiPNet09.12 O2k-Titrations
- Titration volume (2-mL O2k-chamber): 100 µL using a 100 µL Hamilton syringe.
- Final concentration: 1 mM.
MitoPedia topics: Inhibitor
