Types of Transport - Uniport, Antiport and Symport (Glucose and Na+K+ Transporters)

Some transport proteins bind and transport molecules very selectively. Uniport is the transport of one solute molecule. Symport is the transports of two solute molecules in the same direction. Antiport is the transports of two solute molecules in opposite directions. 1. Glucose binds to a site on the transporter that faces the cell's exterior. 2. Glucose binding causes a conformational change that exposes the glucose to the cell interior. 3. Glucose dissociates from the transporter. 4. The transporter reverts to its original conformation. What class of transporter is this Na+ glucose transporter? 1. Two sodium ions bind to the 1 transporter. 2. Glucose binds to the transporter. 3. The transporter undergoes a conformational change. 4. The glucose dissociates from the transporter, followed by the sodium. Na+K+ Transport 1. Three Na'+ ions bind. 2. A phosphoryl group is transferred from ATP to Asp. 3. The protein conformation changes and Na+ dissociates. 4. Two extracellular K+ bind. 5. The Asp phosphate group is hydrolyzed and P, is released. 6. The protein conformation changes and K+ dissociates.

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