P-L net OXPHOS capacity: Difference between revisions
Beno Marija (talk | contribs) No edit summary |
No edit summary |
||
Line 5: | Line 5: | ||
}} | }} | ||
{{MitoPedia concepts | {{MitoPedia concepts | ||
|mitopedia concept=Respiratory state, Recommended | |mitopedia concept=Respiratory state, Recommended, Ergodynamics | ||
}} | }} | ||
{{MitoPedia methods}} | |||
{{MitoPedia O2k and high-resolution respirometry}} | |||
{{MitoPedia topics | {{MitoPedia topics | ||
|mitopedia topic=EAGLE | |mitopedia topic=EAGLE | ||
}} | }} | ||
Communicated by [[Gnaiger E]] 2014-08-09, edited 2015-01-19. | |||
[[File:EPL-free and excess.jpg|right|240px|thumb|[[Gnaiger 2014 MitoPathways |The Blue Book 2014]]: Fig. 2.4.]] | [[File:EPL-free and excess.jpg|right|240px|thumb|[[Gnaiger 2014 MitoPathways |The Blue Book 2014]]: Fig. 2.4.]] | ||
Revision as of 21:01, 23 August 2018
Description
The free OXPHOS capacity, โP, is the OXPHOS capacity corrected for LEAK respiration, โP = P-L. โP is the scope for ADP stimulation, the respiratory capacity potentially available for phosphorylation of ADP to ATP. Oxygen consumption in the OXPHOS state, therefore, is partitioned into the free OXPHOS capacity, โP, strictly coupled to phosphorylation, ~P, and nonphosphorylating LEAK respiration, LP, compensating for proton leaks, slip and cation cycling: P = โP+LP. It is frequently assumed that LEAK respiration, L, as measured in the LEAK state, overestimates the LEAK component of respiration, LP, as measured in the OXPHOS state, particularly if the protonmotive force is not adjusted to equivalent levels in L and LP. However, if the LEAK component increases with enzyme turnover during P, the low enzyme turnover during L may counteract the effect of the higher ฮpmt.
Abbreviation: โP
Reference: Gnaiger 2014 MitoPathways
MitoPedia concepts:
Respiratory state,
Recommended,
Ergodynamics
MitoPedia topics:
EAGLE
Communicated by Gnaiger E 2014-08-09, edited 2015-01-19.
Coupling control states for โP
- Reference state, ZX: OXPHOS capacity, P = Pยด-ROX
- Background state, YX: LEAK respiration, L = Lยด-ROX
- Metabolic control variable, X=ZX-YX: Scope of ADP stimulation, free OXPHOS capacity, โP = P-L
Flux control factor
- ยป Flux control factor, FCF
- Coupling control factor, 1-YX/ZX: P-L coupling control factor, OXPHOS coupling efficiency: jโP = โP/P =(P-L)/P = 1-L/P
Compare
- Free ET-capacity, โE = E-L
- netOXPHOS control ratio, โP/E control ratio: โP/E = (P-L)/E
- ET-coupling efficiency, E-L control factor: jโE = โE/E = (E-L)/E = 1-L/E
- Intact cells: Free ROUTINE activity, โR = R-L