Processing amyloid precursor protein at the beta-site requires proper orientation to be accessed by BACE1.

Abstract excerpt

Membrane-bound BACE1 naturally cleaves its transmembrane substrate amyloid precursor protein (APP) at the two adjacent beta- and beta'-sites. Cleavage at these two sites generates the heterogeneous N-terminal end of APP C-terminal fragments that are further processed by gamma-secretase to release Abeta-(1-40/42) or Abeta-(11-40/42). The significance underlying Abeta-(11-40/42) in Alzheimer's disease pathogenesis...

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