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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.
They are specific, transporting only the molecules they recognize. This is illustrated in the cartoon shown to the left (from Trends in Biochemical Sciences, ca 1980). As the reader surely understands, transport of glucose is essential for life and is carefully regulated. Five proteins with a high degree of homology are involved in concentration-driven transport of glucose over cellular membranes. Each of these has special physiological functions and tissue distribution.