Difference between revisions of "State 5"
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|description='''State 5''' is the [[respiratory state]] obtained in a protocol with isolated mitochondria after a sequence of [[State 1]] to [[State 4]], when the concentration of O<sub>2</sub> is depleted in the closed oxygraph chamber and zero oxygen (the anaerobic state) is reached ([[Chance 1955 JBC-III|Chance and Williams, 1955]]; Table I). | |description='''State 5''' is the [[respiratory state]] obtained in a protocol with isolated mitochondria after a sequence of [[State 1]] to [[State 4]], when the concentration of O<sub>2</sub> is depleted in the closed oxygraph chamber and zero oxygen (the anaerobic state) is reached ([[Chance 1955 JBC-III|Chance and Williams, 1955]]; Table I). | ||
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|info=[[Chance 1955 JBC-III]]; [[Gnaiger 2009 Int J Biochem Cell Biol]] | |info=[[Chance 1955 JBC-III]]; [[Gnaiger 2009 Int J Biochem Cell Biol]] | ||
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{{MitoPedia methods | {{MitoPedia methods | ||
|mitopedia method=Respirometry, Spectrophotometry | |mitopedia method=Respirometry, Spectrophotometry | ||
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{{MitoPedia topics | {{MitoPedia topics | ||
|mitopedia topic=Respiratory state | |mitopedia topic=Respiratory state | ||
Revision as of 23:40, 27 January 2016
- high-resolution terminology - matching measurements at high-resolution
State 5
Description
State 5 is the respiratory state obtained in a protocol with isolated mitochondria after a sequence of State 1 to State 4, when the concentration of O2 is depleted in the closed oxygraph chamber and zero oxygen (the anaerobic state) is reached (Chance and Williams, 1955; Table I).
State 5 is defined in the original publication in two ways: State 5 may be obtained by antimycin A treatment or by anaerobiosis (Chance and Williams, 1955; page 414). Antimycin A treatment yields a State 5 equivalent to a state for measurement of residual oxygen consumption, ROX (which may also be induced by rotenone+myxothiazol; Gnaiger 2009). Setting State 5 equivalent to ROX or anoxia (Chance and Williams 1955) can be rationalized only in the context of measurement of cytochrome redox states, whereas in the context of respiration State 5 is usually referred to as anoxic.
Reference: Chance 1955 JBC-III; Gnaiger 2009 Int J Biochem Cell Biol
MitoPedia methods: Respirometry, Spectrophotometry
MitoPedia topics: "Respiratory state" is not in the list (Enzyme, Medium, Inhibitor, Substrate and metabolite, Uncoupler, Sample preparation, Permeabilization agent, EAGLE, MitoGlobal Organizations, MitoGlobal Centres, ...) of allowed values for the "MitoPedia topic" property. Respiratory state"Respiratory state" is not in the list (Enzyme, Medium, Inhibitor, Substrate and metabolite, Uncoupler, Sample preparation, Permeabilization agent, EAGLE, MitoGlobal Organizations, MitoGlobal Centres, ...) of allowed values for the "MitoPedia topic" property.
State 5 and zero oxygen
State 5 after an aerobic-anoxic transition provides conditions for internal zero-oxygen calibration of the oxygen sensor under anoxia, which is essential for measurement of oxygen kinetics by high-resolution respirometry in a closed system (Gnaiger et al 1995; Scandurra and Gnaiger 2010). Although zero oxygen cannot strictly be reached owing to thermodynamic and kinetic contraints, a minimum pO2 of 0.0003 kPa is calculated to be reached at typical mitochondrial incubation conditions, which is due to the high mitochondrial oxygen affinitiy and is practically zero from an experimental point of view (Gnaiger et al 1995). Owing to the low oxygen affinity of permeabilized muscle fibres (Gnaiger 2003), however, State 5 is difficult to be reached in such mt-preparations within tolerable short periods of incubation time.
References
Chance B, Williams GR (1955) Respiratory enzymes in oxidative phosphorylation. III. The steady state. J Biol Chem 217: 409-427.
Gnaiger E (2003) Oxygen conformance of cellular respiration. A perspective of mitochondrial physiology. Adv Exp Med Biol 543: 39-55. PMID: 8746845
Gnaiger E (2009) Capacity of oxidative phosphorylation in human skeletal muscle. New perspectives of mitochondrial physiology. Int J Biochem Cell Biol 41: 1837–1845. PMID: 19467914
Gnaiger E, Steinlechner-Maran R, Méndez G, Eberl T, Margreiter R (1995) Control of mitochondrial and cellular respiration by oxygen. J Bioenerg Biomembr 27: 583-596. PMID: 14713113
Scandurra FM, Gnaiger E (2010) Cell respiration under hypoxia: Facts and artefacts in mitochondrial oxygen kinetics. Adv Exp Med Biol 662: 7-25. PMID: 20204766
