Membrane transport protein

From Wikipedia, the free encyclopedia
Jump to: navigation, search

A membrane transport protein (or simply transporter) is a membrane protein[1] involved in the movement of ions, small molecules, or macromolecules, such as another protein, across a biological membrane. Transport proteins are integral transmembrane proteins; that is they exist permanently within and span the membrane across which they transport substances. The proteins may assist in the movement of substances by facilitated diffusion or active transport. These mechanisms of action are known as carrier-mediated transport.[2]


(Grouped by Transporter Classification database categories)

1: Channels/pores[edit]

Facilitated diffusion occurs in and out of the cell membrane.

2: Electrochemical potential-driven transporters[edit]

3: Primary active transporters[edit]

4: Secondary active transporters[edit]

Symporters transport two or more ions together in the same direction, antiporters in the opposite direction.

5: Incompletely characterized transport systems[edit]


See also[edit]


External links[edit]