Difference between revisions of "State 2"
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|abbr=ROX<sub>D</sub> | |abbr=ROX<sub>D</sub> | ||
|description=Substrate limited state of [[residual oxygen consumption]], after addition of ADP (ROX<sub>D</sub>).Β Residual endogenous substrates are oxidized during a transient stimulation of oxygen flux by ADP; ADP concentration (D) remains high during ROX<sub>D</sub>. | |description=Substrate limited state of [[residual oxygen consumption]], after addition of ADP (ROX<sub>D</sub>).Β Residual endogenous substrates are oxidized during a transient stimulation of oxygen flux by ADP; ADP concentration (D) remains high during ROX<sub>D</sub>. | ||
In contrast to the definition of State 2 by Chance and Williams (1955, 1956), a respiratory [[LEAK]] state may be induced as the second respiratory state in a protocol with isolated mitochondria, permeabilized tissues, or permeabilized cells, adding the mitochondrial preparation to respiration medium containing inorganic phosphate (State 1), then adding reduced substrate (no external adenylates, State 2'; whereas State 2 is defined as high [ADP] without external substrates). This second state is a non-phosphorylating LEAK state, ''L''<sub>N</sub> (N for no adenylates), when substrate-saturated respiration compensates for the proton leak (mainly) in the absence of ADP. | |||
|info=[[MiPNet12.15]], Chance 1955 JBC-III | |info=[[MiPNet12.15]], Chance 1955 JBC-III | ||
|type=Respiration | |type=Respiration | ||
}} | }} | ||
{{Labeling}} | {{Labeling | ||
|discipline=Mitochondrial Physiology | |||
|kinetics=ADP; Pi, Reduced Substrate; Cytochrome c | |||
|topics=Respiration; OXPHOS; ETS Capacity | |||
|type=Respiration | |||
}} |
Revision as of 19:25, 20 December 2010
Description
Substrate limited state of residual oxygen consumption, after addition of ADP (ROXD). Residual endogenous substrates are oxidized during a transient stimulation of oxygen flux by ADP; ADP concentration (D) remains high during ROXD.
In contrast to the definition of State 2 by Chance and Williams (1955, 1956), a respiratory LEAK state may be induced as the second respiratory state in a protocol with isolated mitochondria, permeabilized tissues, or permeabilized cells, adding the mitochondrial preparation to respiration medium containing inorganic phosphate (State 1), then adding reduced substrate (no external adenylates, State 2'; whereas State 2 is defined as high [ADP] without external substrates). This second state is a non-phosphorylating LEAK state, LN (N for no adenylates), when substrate-saturated respiration compensates for the proton leak (mainly) in the absence of ADP.
Abbreviation: ROXD
Reference: MiPNet12.15, Chance 1955 JBC-III
Labels:
Regulation: Respiration; OXPHOS; ETS Capacity"Respiration; OXPHOS; ETS Capacity" is not in the list (Aerobic glycolysis, ADP, ATP, ATP production, AMP, Calcium, Coupling efficiency;uncoupling, Cyt c, Flux control, Inhibitor, ...) of allowed values for the "Respiration and regulation" property.