TERMINAL H ELECTRON TRANSPORT SYSTEM 



17 



TABLE 3 



REDOX POTENTIALS OF BIOLOGICAL INTEREST AND 

 ABSORPTION MAXIMA OF COMPONENTS OF ELECTRON TRANSPORT SYSTEM 



Component 



E'} (V) Oxidized^ jreduced 



Eh 



Absorption maxima 

 (A) at 25 



cytochrome e (c^) 

 cytochrome m 

 (solubiHzed) 

 succinate/fumarate 



FAD (cyt. c-reductase) 

 menadione/menadione 



+ 0.020 

 0.0 



very large 



6000 — 4450 



+ 0.370 6050 — 4500 



+0.330 5500 5210 4160 

 4650 



5530 5230 4180 



o 5640 5300 4300 

 -0.030 4650 



5560 5270 4240 



—0.318 



3400 

 3400 



^ E\ = V at 25", pH 7 when concentrations of oxidized and reduced forms are equal. 

 •^ Liver mitochondria under conditions of high ADP, substrate, and oxygen concentrations 

 (Chance and Williams, 1956). 



Literature p. 124 



