Proton pump

Common card · No. 448826

A proton pump is an integral membrane protein pump that builds up a proton gradient across a biological membrane. Proton pumps catalyzes the following reaction: H+[on one side of a biological membrane] + energy ⇌ H+[on the other side of the membrane] Mechanisms are based on energy-induced conformational changes of the protein structure, or on the Q cycle. During evolution, proton pumps have arisen independently on multiple occasions. Thus, when comparing proton pumps- either same cell/different pump, or different cells/different pump- they will not all be evolutionarily related. Proton pumps are divided into different major classes of pumps that use different sources of energy, exhibiting different polypeptide compositions and evolutionary origins.

Read on Wikipedia · Image David Goodsell & RCSB Protein Data Bank, CC BY-SA 3.0