Template:SUIT-009 AmR mt D021

Steps and respiratory states

Step	State	Pathway	Q-junction	Comment - Events (E) and Marks (M)
0DTPA				DTPA is an iron chelator, which decreases the chemical fluorescence background created by the Amplex UltraRed assay. Administration of DTPA into the O2k-chamber is recommended before all other chemicals because the iron chelation capacity of the compound is time-dependent (approx. 10-15 min). However, the experiments can be carried out in the absence of DTPA.
0SOD				SOD or superoxide dismutase converts the anion superoxide released by the mitochondria into H2O2, making it accessible to the Amplex UltraRed assay.
0HRP				HRP or horseradish peroxidase catalyses the conversion of Amplex UltraRed and H2O2 towards the fluorescent resorufin.
0AmR				AmR or Amplex UltraRed forms resorufin with H2O2 catalysed by horseradish peroxidase HRP.

Step	State	Pathway	Q-junction	Comment - Events (E) and Marks (M)
1S	SL	S	CII	SL or S_L: Succinate, S-LEAK respiration, SL Succinate, S ( type S-pathway to Q). Non-phosphorylating resting state (LEAK state); LEAK respiration L(n) in the absence of ADP, ATP, AMP (no adenylates).
2D	SP	S	CII	1S;2D Succinate, S ( type S-pathway to Q). OXPHOS capacity P (with saturating [ADP]), active OXPHOS state.
3P	NSP	NS	CI&II	1S;2D;3P 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.
4Rot	SP	S	CII	1S;2D;3P;4Rot Succinate, S ( type S-pathway to Q). OXPHOS capacity P (with saturating [ADP]), active OXPHOS state. Succinate pathway control state (S-pathway) after inhibiting CI with rotenone, which also inhibits the F-pathway.
6Ama	ROX			1S;2D;3P;4Rot;5Ama 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).

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Coupling control

» Coupling control state

» ET capacity

» OXPHOS capacity

» LEAK respiration

Pathway control

» Electron transfer pathway

» Fatty acid oxidation pathway control state, F

» NADH electron transfer-pathway state, N

» Succinate pathway control state, S

» NS-pathway control state, NS

» Glycerophosphate pathway control state, Gp

» Complex IV single step, CIV

» Anaplerotic pathway control state

Main fuel substrates

» Glutamate, G

» Glycerophosphate, Gp

» Malate, M

» Octanoylcarnitine, Oct

» Pyruvate, P

» Succinate, S

Glossary

» List of SUIT states

» SUIT concept