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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.
Active Transport. Carrier proteins (pumps) actively transport solutes (such as sodium, potassium, calcium, and magnesium ions) across a membrane, against their concentration gradient and require energy such as ATP. Transport is dependent upon the availability of carrier proteins and ATP.ctive Transport. Carrier proteins (pumps) actively transport solutes (such as sodium, potassium, calcium, and magnesium ions) across a membrane, against their concentration gradient and require energy such as ATP. Transport is dependent upon the availability of carrier proteins and ATP.