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(January 2009). A membrane transport protein (or simply transporter) is a membrane protein involved in the movement of ions, small molecules, or macromolecules, such as another protein, across a biological membrane.January 2009). A membrane transport protein (or simply transporter) is a membrane protein involved in the movement of ions, small molecules, or macromolecules, such as another protein, across a biological membrane.
The structure of the cell membrane enables protein molecules to push materials into the cell's interior. When energy is needed to accomplish this, active transport is the mechanism through which protein molecules coordinate this process.