RHG proteins possess a 12 amino acid RHG motif. This motif, also known as the IAP-binding motif (IBM), interacts with the BIR domain of Inhibitor of apoptosis proteins (IAPs) and relieving IAP-mediated caspase inhibition. Over-expression of individual RHG proteins is sufficient to induce apoptosis. (Adapted from
FBrf0225510).