Coupling-control ratio

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Coupling-control ratio

Description

Coupling control ratios CCR are flux control ratios FCR at a constant mitochondrial pathway control state. In mitochondrial preparations, there are three well-defined coupling states of respiration: LEAK, OXPHOS, and Electron transfer pathway state (ET state). In these states, the corresponding respirtory rates are symbolized as L, P, and E. In living cells, the OXPHOS state cannot be induced, but in the ROUTINE state the respiration rate is R. A reference rate Z is defined by taking Z as the maximum flux, i.e. flux E in the ET-state, such that the lower and upper limits of the CCR are defined as 0.0 and 1.0. Then there are two mitochondrial CCR, L/E and P/E, and two CCR for living cells, L/E and R/E.

Abbreviation: CCR

Reference: Flux control ratio

References

Bioblast link	Reference	Year
Gnaiger 2020 BEC MitoPathways	Gnaiger E (2020) Mitochondrial pathways and respiratory control. An introduction to OXPHOS analysis. 5th ed. Bioenerg Commun 2020.2. https://doi.org/10.26124/bec:2020-0002	2020
BEC 2020.1 doi10.26124bec2020-0001.v1	Gnaiger E et al ― MitoEAGLE Task Group (2020) Mitochondrial physiology. Bioenerg Commun 2020.1. https://doi.org/10.26124/bec:2020-0001.v1	2020

Keywords

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  The Blue Book 2020
  

• 

  OXPHOS-, ROUTINE-, ET-, and LEAK states; respiratory capacities (P, R, E, L) corrected for residual oxygen consumption Rox.

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  4-compartmental OXPHOS model. (1) ET capacity E of the noncoupled electron transfer system ETS. OXPHOS capacity P is partitioned into (2) the dissipative LEAK component L, and (3) ADP-stimulated P-L net OXPHOS capacity. (4) If P-L is kinetically limited by a low capacity of the phosphorylation system to utilize the protonmotive force pmF, then the apparent E-P excess capacity is available to drive coupled processes other than phosphorylation P» (ADP to ATP) without competing with P».

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• 
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  (P-L)/P is the OXPHOS P-L control efficiency. The biochemical coupling efficiency is independent of kinetic control by the phosphorylation system when expressed as the E-L coupling efficiency, (E-L)/E. (E-P)/E is the kinetic E-P control efficiency.

Bioblast links: Coupling control - >>>>>>> - Click on [Expand] or [Collapse] - >>>>>>>

1. Mitochondrial and cellular respiratory rates in coupling-control states

» Baseline state

Respiratory rate	Defining relations	Icon
OXPHOS capacity	P = P´-Rox		mt-preparations
ROUTINE respiration	R = R´-Rox		living cells
ET capacity	E = E´-Rox		» Level flow
			» Noncoupled respiration - Uncoupler
LEAK respiration	L = L´-Rox		» Static head
			» LEAK state with ATP
			» LEAK state with oligomycin
			» LEAK state without adenylates
Residual oxygen consumption Rox	L = L´-Rox

• Chance and Williams nomenclature: respiratory states

» State 1 —» State 2 —» State 3 —» State 4 —» State 5

2. 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		» Respiratory acceptor control ratio, RCR = P/L
L/R coupling-control ratio	L/R
L/E coupling-control ratio	L/E		» Uncoupling-control ratio, UCR = E/L (ambiguous)
P/E control ratio	P/E
R/E control ratio	R/E		» Uncoupling-control ratio, UCR = E/L
net P/E control ratio	(P-L)/E
net R/E control ratio	(R-L)/E

3. Net, excess, and reserve capacities of respiration

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

4. Flux control efficiencies related to coupling-control ratios

» Flux control efficiency j_Z-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 OXPHOS-flux control efficiency
R-L control efficiency	jR-L	= (R-L)/R	= 1-L/R		R-L ROUTINE-flux control efficiency
E-L coupling efficiency	jE-L	= (E-L)/E	= 1-L/E		E-L ET-coupling efficiency » Biochemical coupling efficiency
E-P control efficiency	jE-P	= (E-P)/E	= 1-P/E		E-P ET-excess flux control efficiency
E-R control efficiency	jE-R	= (E-R)/E	= 1-R/E		E-R ET-reserve flux control efficiency

5. General

» 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

Bioblast links: Normalization - >>>>>>> - Click on [Expand] or [Collapse] - >>>>>>>

Rate

» Normalization of rate

» Flow

» Oxygen flow

» Flux

» Oxygen flux

» Flux control ratio

» Coupling-control ratio

» Pathway control ratio

» Flux control efficiency

Quantities for normalization

» Count in contrast to Number

» Mitochondrial marker

» O2k-Protocols: mitochondrial and marker-enzymes

» Citrate synthase activity

General

» Extensive quantity

» Specific quantity

» Advancement

» Motive unit

» Iconic symbols

Related keyword lists

» Keywords: Concentration and pressure

MitoPedia concepts: Respiratory control ratio 

MitoPedia methods: Respirometry