Step
|
State
|
Pathway
|
Q-junction
|
Comment - Events (E) and Marks (M)
|
1GMS
|
GMSL(n)
|
NS
|
CI&CII
|
1GMS
- Respiratory stimulation by simultaneous action of type N substrates & succinate, with convergent electron flow in the NS-pathway for reconstitution of TCA cycle function.
- Non-phosphorylating resting state (LEAK state); LEAK respiration L(n) in the absence of ADP, ATP, AMP (no adenylates).
|
2D
|
GMSP
|
NS
|
CI&CII
|
1GMS;2D
- Respiratory stimulation by simultaneous action of type N substrates & succinate, with convergent electron flow in the NS-pathway for reconstitution of TCA cycle function.
- OXPHOS capacity P (with saturating [ADP]), active OXPHOS state.
|
2c
|
GMScP
|
NS
|
CI&CII
|
1GMS;2D;2c
- Respiratory stimulation by simultaneous action of type N substrates & succinate, with convergent electron flow in the NS-pathway for reconstitution of TCA cycle function.
- OXPHOS capacity P (with saturating [ADP]), active OXPHOS state.
- Addition of cytochrome c yields a test for integrity of the mtOM (cytochrome c control efficiency). Stimulation by added cytochrome c would indicate an injury of the mtOM and limitation of respiration in the preceding state without added c due to loss of cytochrome c. Typically, cytochrome c is added immediately after the earliest ADP-activation step (OXPHOS capacity P with saturating [ADP]).
|
3Ama
|
ROX
|
|
|
1GMS;2D;2c;3Ama
- Rox is the residual oxygen consumption in the ROX state, due to oxidative side reactions, estimated after addition of antimycin A (inhibitor of CIII). Rox is subtracted from oxygen flux as a baseline for all respiratory states, to obtain mitochondrial respiration (mt).
|