P-L net OXPHOS capacity

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P-L net OXPHOS capacity


P-L net OXPHOS capacity The P-L net OXPHOS capacity is the OXPHOS capacity corrected for LEAK respiration. P-L 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 P-L, strictly coupled to phosphorylation , and nonphosphorylating LEAK respiration, LP, compensating for proton leaks, slip and cation cycling: P = P-L+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 pmF.

Abbreviation: P-L

Reference: Gnaiger 2020 BEC MitoPathways

Communicated by Gnaiger E (2014-08-09) last update 2020-11-11


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Mitochondrial and cellular respiratory rates in coupling-control states

OXPHOS-coupled energy cycles. Source: The Blue Book
» Baseline state
Respiratory rate Definition Icon
OXPHOS capacity P = -Rox P.jpg mt-preparations
ROUTINE respiration R = -Rox R.jpg living cells
ET capacity E = -Rox E.jpg » Level flow
» Noncoupled respiration - Uncoupler
LEAK respiration L = -Rox L.jpg » Static head
» LEAK state with ATP
» LEAK state with oligomycin
» LEAK state without adenylates
Residual oxygen consumption Rox L = -Rox ROX.jpg
  • Chance and Williams nomenclature: respiratory states
» State 1 —» State 2 —» State 3 —» State 4 —» State 5

Flux control ratios related to coupling in mt-preparations and living cells

» Flux control ratio
» Coupling-control ratio
» Coupling-control protocol
FCR Definition Icon
L/P coupling-control ratio L/P L/P coupling-control ratio » Respiratory acceptor control ratio, RCR = P/L
L/R coupling-control ratio L/R L/R coupling-control ratio
L/E coupling-control ratio L/E L/E coupling-control ratio » Uncoupling-control ratio, UCR = E/L
P/E control ratio P/E P/E control ratio
R/E control ratio R/E R/E control ratio
net P/E control ratio (P-L)/E net P/E control ratio
net R/E control ratio (R-L)/E net R/E control ratio

Net, excess, and reserve capacities of respiration

Respiratory net rate Definition Icon
P-L net OXPHOS capacity P-L P-L net OXPHOS  capacity
R-L net ROUTINE capacity R-L R-L net ROUTINE capacity
E-L net ET capacity E-L E-L net ET capacity
E-P excess capacity E-P E-P excess capacity
E-R reserve capacity E-R E-R reserve capacity

Flux control efficiencies related to coupling-control ratios

» Flux control efficiency jZ-Y
» Background state
» Reference state
» Metabolic control variable
Coupling-control efficiency Definition Icon Canonical term
P-L control efficiency jP-L = (P-L)/P = 1-L/P P-L control efficiency P-L OXPHOS-flux control efficiency
R-L control efficiency jR-L = (R-L)/R = 1-L/R R-L control efficiency R-L ROUTINE-flux control efficiency
E-L coupling efficiency jE-L = (E-L)/E = 1-L/E E-L coupling efficiency E-L ET-coupling efficiency » Biochemical coupling efficiency
E-P control efficiency jE-P = (E-P)/E = 1-P/E E-P control efficiency E-P ET-excess flux control efficiency
E-R control efficiency jE-R = (E-R)/E = 1-R/E E-R control efficiency E-R ET-reserve flux control efficiency


» Basal respiration
» Cell ergometry
» Dyscoupled respiration
» Dyscoupling
» Electron leak
» Electron-transfer-pathway state
» Hyphenation
» Oxidative phosphorylation
» Oxygen flow
» Oxygen flux
» Permeabilized cells
» Phosphorylation system
» Proton leak
» Proton slip
» Respiratory state
» Uncoupling