Previously conserved energy is spent to drive electrons toward a more reducing potential.
Purpose:
- generate NADH
- generate NADPH
- reduce ferredoxin
- support carbon fixation or biosynthesis
Operational definition
Redox-coupling mechanism.
The expenditure of previously conserved energy to drive electrons against their spontaneous redox direction toward a carrier with a more negative reduction potential.
The required energy may come from:
- proton motive force;
- sodium motive force;
- ATP hydrolysis;
- another coupled reaction.
Its usual purpose is to generate strong reducing power for carbon fixation or biosynthesis.