- XIAP Is a copper binding protein deregulated in Wilson's disease and other copper toxicosis disorders. Mufti, A.R., Burstein, E., Csomos, R.A., Graf, P.C., Wilkinson, J.C., Dick, R.D., Challa, M., Son, J.K., Bratton, S.B., Su, G.L., Brewer, G.J., Jakob, U., Duckett, C.S. Mol. Cell (2006)