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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 functions can vary greatly, the fact that its an integral protein limits the functions but there are still many different functions. Ill go through a few functions of integral transmembrane proteins.Transportation. Integral proteins can transport molecules and ions through the membrane, facilitated or active transport are two such transport functions.The protein can also act as ion channels which help the cells to keep the ion gradient at a good level (varies greatly for different ions).ransportation. Integral proteins can transport molecules and ions through the membrane, facilitated or active transport are two such transport functions. The protein can also act as ion channels which help the cells to keep the ion gradient at a good level (varies greatly for different ions).