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TitleStructural basis of human γ-secretase assembly.
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 112, Issue 19, Page 6003-6008, Year 2015
Publish dateMay 12, 2015
AuthorsLinfeng Sun / Lingyun Zhao / Guanghui Yang / Chuangye Yan / Rui Zhou / Xiaoyuan Zhou / Tian Xie / Yanyu Zhao / Shenjie Wu / Xueming Li / Yigong Shi /
PubMed AbstractThe four-component intramembrane protease γ-secretase is intricately linked to the development of Alzheimer's disease. Despite recent structural advances, the transmembrane segments (TMs) of γ- ...The four-component intramembrane protease γ-secretase is intricately linked to the development of Alzheimer's disease. Despite recent structural advances, the transmembrane segments (TMs) of γ-secretase remain to be specifically assigned. Here we report a 3D structure of human γ-secretase at 4.32-Å resolution, determined by single-particle, electron cryomicroscopy in the presence of digitonin and with a T4 lysozyme fused to the amino terminus of presenilin 1 (PS1). The overall structure of this human γ-secretase is very similar to that of wild-type γ-secretase determined in the presence of amphipols. The 20 TMs are unambiguously assigned to the four components, revealing principles of subunit assembly. Within the transmembrane region, PS1 is centrally located, with its amino-terminal fragment (NTF) packing against Pen-2 and its carboxyl-terminal fragment (CTF) interacting with Aph-1. The only TM of nicastrin associates with Aph-1 at the thick end of the TM horseshoe, and the extracellular domain of nicastrin directly binds Pen-2 at the thin end. TM6 and TM7 in PS1, which harbor the catalytic aspartate residues, are located on the convex side of the TM horseshoe. This structure serves as an important framework for understanding the function and mechanism of γ-secretase.
External linksProc Natl Acad Sci U S A / PubMed:25918421 / PubMed Central
MethodsEM (single particle)
Resolution4.4 Å
Structure data

2974

4uis

EMDB-2974: The cryoEM map of human gamma-Secretase complex
PDB-4uis: The cryoEM structure of human gamma-Secretase complex
Method: EM (single particle) / Resolution: 4.4 Å

Source
  • homo sapiens (human)
KeywordsHYDROLASE / GAMMA-SECRETASE

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