5A63
Cryo-EM structure of the human gamma-secretase complex at 3.4 angstrom resolution.
Replaces: 4UPCSummary for 5A63
| Entry DOI | 10.2210/pdb5a63/pdb |
| EMDB information | 3061 |
| Descriptor | Nicastrin, Presenilin-1, Gamma-secretase subunit APH-1A, ... (8 entities in total) |
| Functional Keywords | hydrolase, cryo-em, human gamma-secretase, membrane protein |
| Biological source | Homo sapiens (Human) More |
| Total number of polymer chains | 4 |
| Total formula weight | 177972.24 |
| Authors | |
| Primary citation | Bai, X.,Yan, C.,Yang, G.,Lu, P.,Ma, D.,Sun, L.,Zhou, R.,Scheres, S.H.W.,Shi, Y. An Atomic Structure of Human Gamma-Secretase Nature, 525:212-, 2015 Cited by PubMed Abstract: Dysfunction of the intramembrane protease γ-secretase is thought to cause Alzheimer's disease, with most mutations derived from Alzheimer's disease mapping to the catalytic subunit presenilin 1 (PS1). Here we report an atomic structure of human γ-secretase at 3.4 Å resolution, determined by single-particle cryo-electron microscopy. Mutations derived from Alzheimer's disease affect residues at two hotspots in PS1, each located at the centre of a distinct four transmembrane segment (TM) bundle. TM2 and, to a lesser extent, TM6 exhibit considerable flexibility, yielding a plastic active site and adaptable surrounding elements. The active site of PS1 is accessible from the convex side of the TM horseshoe, suggesting considerable conformational changes in nicastrin extracellular domain after substrate recruitment. Component protein APH-1 serves as a scaffold, anchoring the lone transmembrane helix from nicastrin and supporting the flexible conformation of PS1. Ordered phospholipids stabilize the complex inside the membrane. Our structure serves as a molecular basis for mechanistic understanding of γ-secretase function. PubMed: 26280335DOI: 10.1038/NATURE14892 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (3.4 Å) |
Structure validation
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