4.5 Review

Function, therapeutic potential and cell biology of BACE proteases: current status and future prospects

Journal

JOURNAL OF NEUROCHEMISTRY
Volume 130, Issue 1, Pages 4-28

Publisher

WILEY
DOI: 10.1111/jnc.12715

Keywords

Alzheimer's disease; BACE1; BACE2; protease; regulated intramembrane proteolysis; secretase

Funding

  1. European Research Council under the European Union/ ERC [321366-Amyloid]
  2. BMBF (KNDD)
  3. JPND RiMod
  4. DAAD
  5. NIH [R01AG022560, R01AG030142]
  6. Cure Alzheimer's Fund
  7. BrightFocus Foundation
  8. Alzheimer's Association
  9. Swiss National Science Foundation
  10. Velux Foundation

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The -site APP cleaving enzymes 1 and 2 (BACE1 and BACE2) were initially identified as transmembrane aspartyl proteases cleaving the amyloid precursor protein (APP). BACE1 is a major drug target for Alzheimer's disease because BACE1-mediated cleavage of APP is the first step in the generation of the pathogenic amyloid- peptides. BACE1, which is highly expressed in the nervous system, is also required for myelination by cleaving neuregulin 1. Several recent proteomic and in vivo studies using BACE1- and BACE2-deficient mice demonstrate a much wider range of physiological substrates and functions for both proteases within and outside of the nervous system. For BACE1 this includes axon guidance, neurogenesis, muscle spindle formation, and neuronal network functions, whereas BACE2 was shown to be involved in pigmentation and pancreatic -cell function. This review highlights the recent progress in understanding cell biology, substrates, and functions of BACE proteases and discusses the therapeutic options and potential mechanism-based liabilities, in particular for BACE inhibitors in Alzheimer's disease. The protease BACE1 is a major drug target in Alzheimer disease. Together with its homolog BACE2, both proteases have an increasing number of functions within and outside of the nervous system. This review highlights recent progress in understanding cell biology, substrates, and functions of BACE proteases and discusses the therapeutic options and potential mechanism-based liabilities, in particular for BACE inhibitors in Alzheimer disease.

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