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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Presenilin-1 and -2 are molecular targets for gamma-secretase inhibitors.

Presenilins are integral membrane protein involved in the production of amyloid beta-protein. Mutations of the presenilin-1 and -2 gene are associated with familial Alzheimer's disease and are thought to alter gamma-secretase cleavage of the beta-amyloid precursor protein, leading to increased production of longer and more amyloidogenic forms of A beta, the 4-kDa beta-peptide. Here, we show that radiolabeled gamma-secretase inhibitors bind to mammalian cell membranes, and a benzophenone analog specifically photocross-links three major membrane polypeptides. A positive correlation is observed among these compounds for inhibition of cellular A beta formation, inhibition of membrane binding and cross-linking. Immunological techniques establish N- and C-terminal fragments of presenilin-1 as specifically cross-linked polypeptides. Furthermore, binding of gamma-secretase inhibitors to embryonic membranes derived from presenilin-1 knockout embryos is reduced in a gene dose-dependent manner. In addition, C-terminal fragments of presenilin-2 are specifically cross-linked. Taken together, these results indicate that potent and selective gamma-secretase inhibitors block A beta formation by binding to presenilin-1 and -2.[1]


  1. Presenilin-1 and -2 are molecular targets for gamma-secretase inhibitors. Seiffert, D., Bradley, J.D., Rominger, C.M., Rominger, D.H., Yang, F., Meredith, J.E., Wang, Q., Roach, A.H., Thompson, L.A., Spitz, S.M., Higaki, J.N., Prakash, S.R., Combs, A.P., Copeland, R.A., Arneric, S.P., Hartig, P.R., Robertson, D.W., Cordell, B., Stern, A.M., Olson, R.E., Zaczek, R. J. Biol. Chem. (2000) [Pubmed]
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