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Index >> Membrane Transport >> Energetics of Active Transport

Energetics of Active Transport

Energetics of Active Transport
Energization of active transport can be achieved by

(i) oxidation via the respiratory chain,

(ii) hydrolysis of ATP via the membrane bound Mg++-Ca++-ATPase or

(iii) by ion gradients. All these pathways lead to the 'high energy state' of the membrane.

The energy can be utilized in energy requiring processes such as ATP synthesis, solute transport, reversed electron transport and energy-linked trans hydrogenase.

All these processes are tied together, by Mitchell's chemiosmotic theory.According to this theory hydrogen and electron carriers of respiratory chain are arranged in loops across the membrane

Electron flow is coupled to translocation of protons from one side of the membrane to the other. A proton motive force is generated and under usual conditions has a value of ~ 60 mV. Bacteria can generate a membrane potential, interior negative, of the order of 50 to 250 mV. The following are examples of reported values.

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