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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.
Structural proteins are also found in cells. They are used to provide an internal structure to the cell and are sometimes involved in cell movement. Structural proteins are especially important in larger cells. Collagen is the most abundant example of a structural protein and accounts for around a quarter of all proteins in the body. Under a microscope, collagen cells look like long fibres that are woven together to create extra strength.