A protein whose shape is changed when it binds a particular molecule. In the new shape the protein's ability to react to a second molecule is altered.

Protein that changes from one conformation to another when it binds another molecule or when it is covalently modified. The change in conformation alters the activity of the protein and can form the basis of directed movement.

a protein that may change its shape as a consequence of interaction with another molecule

an enzyme with two sites, the active site and an allosteric site