Jan 2, 2019

Structural basis of Notch recognition by human γ-secretase

Nature
Guanghui YangYigong Shi

Abstract

Aberrant cleavage of Notch by γ-secretase leads to several types of cancer, but how γ-secretase recognizes its substrate remains unknown. Here we report the cryo-electron microscopy structure of human γ-secretase in complex with a Notch fragment at a resolution of 2.7 Å. The transmembrane helix of Notch is surrounded by three transmembrane domains of PS1, and the carboxyl-terminal β-strand of the Notch fragment forms a β-sheet with two substrate-induced β-strands of PS1 on the intracellular side. Formation of the hybrid β-sheet is essential for substrate cleavage, which occurs at the carboxyl-terminal end of the Notch transmembrane helix. PS1 undergoes pronounced conformational rearrangement upon substrate binding. These features reveal the structural basis of Notch recognition and have implications for the recruitment of the amyloid precursor protein by γ-secretase.

  • References1
  • Citations12

References

Mentioned in this Paper

Receptors, Notch
Notch
Presenilin-1
Transmembrane Domain
Receptor Down-Regulation
Integral to Membrane
Plasma Protein Binding Capacity
Surgical Drapes
Substrate Specificity
PSEN1

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