Summary of electron transport. There can be branches, at terminal electron acceptor, at terminal oxidase, at entry point of NADH (ie. hot stinking plants). Unfortunately, oxygen is not just a terminal electron acceptor. NADH, a great source of energy.
DmH = Dy – 2.3RTDpH/F
(different in Lehninger)
mH is the resulting proton motive force (sometimes p)
y is the electrochemical membrane potential
pH has a negative value, thus contribution is positive in this equation
Plug into DGo = -nFDEo and DGo = ~20 kJ/mole H+
Two components to energy derived from electron transport, pH and electrical potential. The electrical potential is the primary contributor to free energy.
Most of the energy from oxidation of NADH is conserved in the proton gradient
Black – oxygen consumption
Red – ATP synthesis