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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.
Transport proteins function to link the outside and inside of the  cellular membrane to one another by providing methods for molecules  and ions to pass back and forth in be â¦ tween. They do this either  through active or passive transport.