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Kuznetsov 1996 J Biol Chem

From Bioblast
Publications in the MiPMap
Kuznetsov AV, Clark JF, Winkler K, Kunz WS (1996) Increase of flux control of cytochrome c oxidase in copper-deficient mottled brindled mice. J Biol Chem 271:283-8.

ยป PMID: 8550574

Kuznetsov AV, Clark JF, Winkler K, Kunz WS (1996) J Biol Chem

Abstract: The brindled mottled mouse (Mobr), an animal model of the Menkes' copper deficiency syndrome, was used for the investigation of changes in respiratory flux control associated with cytochrome c oxidase deficiency in muscle. Enzymatic analysis of cardiac and skeletal muscles showed an approximately 2-fold decrease in cytochrome c oxidase activity of brindled mutants in both types of muscles as compared with controls. The activities of NADH-cytochrome c oxidoreductase (respiratory chain segment I-III) and succinate-cytochrome c oxidoreductase (segment II-III) were normal. Assessment of mitochondrial respiratory function was performed using chemically skinned musculus quadriceps or heart muscle fibers isolated from control and brindled mottled mice. In skeletal muscle, there was no difference found in maximal rates of respiration. In the Mobr hearts, this parameter was slightly lower than control. Alternately, the determination of flux control coefficients of cytochrome c oxidase performed by a step by step inhibition of respiration with increasing concentrations of azide or cyanide revealed significantly sharper inhibition curves for brindled mice than for control, indicating more than 2-fold elevated flux control coefficients of cytochrome c oxidase. This investigation proved essential in characterizing the metabolic effect of a cytochrome c oxidase deficiency. We conclude, therefore, that application of metabolic control analysis can be a valuable approach to study defects of mitochondrial oxidative phosphorylation.

โ€ข O2k-Network Lab: US OH Cincinnati Clark JF

Cited by

Gnaiger 2020 BEC MitoPathways
Gnaiger E (2020) Mitochondrial pathways and respiratory control. An introduction to OXPHOS analysis. 5th ed. Bioenerg Commun 2020.2.

Labels: MiParea: Respiration, Genetic knockout;overexpression  Pathology: Other 

Organism: Mouse  Tissue;cell: Heart, Skeletal muscle  Preparation: Permeabilized tissue  Enzyme: Complex IV;cytochrome c oxidase  Regulation: Threshold;excess capacity  Coupling state: OXPHOS 

HRR: Oxygraph-2k 

BEC 2020.2