A method for identifying substances that affect the interaction of a presenilin-1-interacting protein with a mammalian presenilin-1 protein, or a fragment, variant or mutein of said mammalian presenilin-1 protein that binds to said presenilin-1-interacting protein, comprising:
- (a) providing a preparation containing:
- a mammalian presenilin-1 protein, or a fragment, variant or mutein of said mammalian presenilin-1 protein that binds to said presenilin-1-interacting protein;
- a presenilin-1-interacting protein;
- and a candidate substance;
- and
- (b) detecting whether said candidate substance affects said interaction of said presenilin-1-interacting protein with said mammalian presenilin-1 protein, or a fragment, variant or mutein of said mammalian presenilin-1 protein that binds to said presenilin-1-interacting protein.