Oxidative Phosphorylation

Chemiosmosis

theory that ATP is made by ATP synthase(enzyme) when H+ flow down a concentration gradient using energy from H+ movement.

Where does OP take place

Cristae membrane

Purpose of oxidative phsophorylation

its role is to produce a H+ gradient between the intermembrane space and the matrix to produce energy by chemiosmosis

Stage 1

NADH and FADH are transported to the electron transport chain in the membrane

Stage 2:

NADH and FADH are oxidised releasing H+, electron carrier accepts electron and pumps H+ into intermembrane space. (upwards)

Stage 3:

electrons are passed along the chain which reduces the energy of the electron. This energy is used to continue pumping H+ into intermembrane space.

stage 4:

Terminal electron acceptor= electrons dont have anywhere to go so they are accepted by O2 forming H20. Therefore, OP can’t occur without oxygen.

stage 5:

H+ gradient formed so H+ move down ATP synthase, phosphorylated to form ATP