Table 2 Driving force of the redox (ΔE) and of the overall redox-coupled proton translocation (ΔG) reactions in States 3 and 4.

From: Thermodynamic efficiency, reversibility, and degree of coupling in energy conservation by the mitochondrial respiratory chain

 

State 3

 

State 4

  
 

ΔE (mV)

ΔG (mV)

ΔE (mV)

ΔG (mV)

q

 

(X2)

(ZX1 + X2)

(X2)

(ZX1 + X2)

 

Complexes I + III + IV

1042 ± 5 (n = 3)

−192

1057 ± 9 (n = 3)

−123

0.880

Complexes III + IV

621 ± 4 (n = 3)

−111

643 ± 4 (n = 3)

−82

0.87

Complex I

384 ± 6 (n = 3)

−44

379 ± 4 (n = 3)

−5

>0.99

Complex III

214 ± 9 (n = 4)

−44

222 ± 6 (n = 4)

−35

0.84

Complex IV

418 ± 15 (n = 5)

−78

434 ± 22 (n = 5)

−60

0.86

(Complex IV)

488 ± 15 (n = 5)

−148

504 ± 22 (n = 5)

−131

 
  1. All numbers are in millivolts ± standard deviation. ΔP = 187 mV in State 4, 170 mV in State 3. The apparent q in State 4 is calculated according to Eq. (9). Complex IV data are calculated in two ways (see text and legend to Table 1). Values are expressed as mean ± SD, where n is the number of distinct samples.
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