An atomic structure of human γ-secretase
Xiao-Chen Bai1, Chuangye Yan2, Guanghui Yang2
1MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK.
The atomic structure of human gamma-secretase (γ-secretase), crucial in Alzheimer's disease, reveals mutations affecting presenilin 1 (PS1) hotspots. This provides a molecular basis for understanding enzyme function and disease mechanisms.
Area of Science:
- Biochemistry
- Structural Biology
- Neuroscience
Background:
- Gamma-secretase (γ-secretase) dysfunction is linked to Alzheimer's disease pathogenesis.
- Mutations associated with Alzheimer's disease predominantly occur in the presenilin 1 (PS1) catalytic subunit.
Purpose of the Study:
- To determine the atomic structure of human γ-secretase.
- To elucidate the structural basis of γ-secretase function and its relation to Alzheimer's disease.
Main Methods:
- Single-particle cryo-electron microscopy (cryo-EM) was used to resolve the structure.
- High-resolution (3.4 Å) structural determination of the γ-secretase complex.
Main Results:
- The structure reveals two mutation hotspots in PS1 within distinct transmembrane segment bundles.
- Presenilin 1 exhibits a flexible active site, influenced by TM2 and TM6 dynamics.
- The APH-1 subunit acts as a scaffold, stabilizing PS1 and nicastrin interactions.
- Ordered phospholipids were observed to stabilize the complex within the membrane.
Conclusions:
- The determined structure provides a molecular foundation for understanding γ-secretase mechanism.
- Insights into PS1 flexibility and active site accessibility offer new perspectives on substrate processing.
- This structural information is vital for developing therapeutic strategies targeting γ-secretase in Alzheimer's disease.
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