Abc transporter protein

ABC transporters are a family of transport proteins that primarily transport small molecules. ABC transporters are composed of two catalytic ATPase domains, when ATP binds the two domains dimerize, and when ATP is hydrolyzed they dissociate. The conformational change in the ABC transporter results in a change in the membrane itself, revealing a substrate binding site. This is thought to be how ABC transporters move small molecules across membranes.