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Protein that moves other materials within an organism
Schematic description of the mechanism of the sodium-potassium pump. Four consecutive steps are shown, from left to right. (1) Three sodium ions enter the transporter on the cell internal side. (2) A phosphoryl group is added to the transporter from ATP. This causes the transporter to close on the inside and open on the outside. The sodium ions then leave to the outside. (3) Two potassium ions enter the transporter from the outside. (4) The transporter opens to the inside while both the potassium ions and the phosphoryl group leaves it.
A transport protein (variously referred to as a transmembrane pump, transporter, escort protein, acid transport protein, cation transport protein, or anion transport protein) is a protein that serves the function of moving other materials within an organism. Transport proteins are vital to the growth and life of all living things. There are several different kinds of transport proteins.