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Lucia Chávez-Gutiérrez1, Mohamed Soliman2, Ivica Odorčić2

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This study reveals how the gamma-secretase complex (GSEC) processes amyloid-beta (Ab) peptides, crucial for Alzheimer's disease. Understanding these mechanisms, particularly APH-1's role, aids in developing new therapies.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Neuroscience

Background:

  • Amyloid-beta (Ab) peptide deposition in the brain is a key feature of Alzheimer's disease.
  • Gamma-secretase complexes (GSECs) generate Ab peptides through sequential proteolysis of amyloid precursor protein (APP).
  • The length of Ab peptides, influenced by Presenilin (PSEN) and APH-1 subunits, is critical for Alzheimer's pathogenesis, yet GSEC's proteolytic mechanisms remain unclear.

Purpose of the Study:

  • To elucidate the mechanistic details of Ab proteolysis by GSEC.
  • To understand the role of the APH-1 subunit in modulating GSEC activity.
  • To provide structural insights into GSEC-substrate interactions.

Main Methods:

  • Reconstitution of human GSEC (PSEN1/APH-1B) into lipid nanodiscs.
  • Cryo-electron microscopy (cryo-EM) to determine structures of apo GSEC and GSEC-Ab46 complex.
  • Characterization of substrate interactions and enzyme rearrangements.

Main Results:

  • A divergent loop in APH-1, along with PSEN1, mediates substrate-binding-induced rearrangements in the enzyme-substrate complex.
  • The structure of the intermediate Ab46 substrate and its specific interactions with PSEN1 were characterized.
  • Polar interactions, including a novel interaction with the PSEN1 loop1, were identified as stabilizing Ab during GSEC-mediated proteolysis.

Conclusions:

  • These findings enhance the understanding of GSEC proteolytic mechanisms.
  • The structural insights are crucial for developing targeted GSEC inhibitors and modulators.
  • This research has implications for future therapies for Alzheimer's disease and cancer.