A decoy receptor, or sink receptor, is a receptor that binds a ligand, inhibiting it from binding to its normal receptor. For instance, the receptor VEGFR-1 can prevent vascular endothelial growth factor (VEGF) from binding to the VEGFR-2.When a prorenin-binding protein interacts with the “handle” region of the prorenin prosegment, the prorenin molecule undergoes a conformational change to an enzymatically active state (5). This phenomenon is called nonproteolytic activation.