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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.
Kinesin is responsible for transporting molecular cargo -- including chromosomes (e.g. during cell division), neurotransmitters and other important material -- along microtubule tracks from one region of the cell to another. kinesin molecule typically possesses two tails on one end, which attach to the cargo, in addition to two globular heads (often called motor domains) on the other end. Some readers may recognize this elegant protein from the now-famous Harvard animation, Inner Life of the Cell (time 1:59).