Metabolism of presenilins

Understanding mechanisms involved in the production of A beta has long been the central focus of cell biologists engaged in molecular AD research. The discovery of two genes that encode homologous polytopic membrane proteins termed Presenilins (PS), has lead to several exciting recent findings on th e proteolytic processes responsible for generating the COOH-terminus of A b eta. What we now know is that PS proteins play an important role in A beta production and are considered one of the therapeutic targets. Here I have r eviewed the vast literature on the biology of PS, especially focusing on PS endoproteolysis and the accumulation of stable PS derivatives that are lik ely the functional units.