8UQ7 | pdb_00008uq7

Alzheimer's disease PHF complexed with PET ligand MK-6240

• PDB DOI: https://doi.org/10.2210/pdb8UQ7/pdb
• EM Map EMD-42463: EMDB EMDataResource

• Classification: PROTEIN FIBRIL
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 2023-10-23 Released: 2024-09-04 
• Deposition Author(s): Kunach, P., Shahmoradian, S.H., Diamond, M.I., Rosa-Neto, P.
• Funding Organization(s): Cancer Prevention and Research Institute of Texas (CPRIT), National Institutes of Health/National Institute of Mental Health (NIH/NIMH), Canadian Institutes of Health Research (CIHR)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.31 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: HELICAL 

Literature

Cryo-EM structure of Alzheimer's disease tau filaments with PET ligand MK-6240.

Kunach, P., Vaquer-Alicea, J., Smith, M.S., Monistrol, J., Hopewell, R., Moquin, L., Therriault, J., Tissot, C., Rahmouni, N., Massarweh, G., Soucy, J.P., Guiot, M.C., Shoichet, B.K., Rosa-Neto, P., Diamond, M.I., Shahmoradian, S.H.

(2024) Nat Commun 15: 8497-8497

• PubMed: 39353896 
• DOI: https://doi.org/10.1038/s41467-024-52265-x
• Primary Citation of Related Structures:  
  8UQ7


• PubMed Abstract: 
  

  Positron Emission Tomography (PET) ligands have advanced Alzheimer's disease (AD) diagnosis and treatment. Using autoradiography and cryo-EM, we identify AD brain tissue with elevated tau burden, purify filaments, and determine the structure of second-generation high avidity PET ligand MK-6240 at 2.31 Å resolution, which bound at a 1:1 ratio within the cleft of tau paired-helical filament (PHF), engaging with glutamine 351, lysine 353, and isoleucine 360. This information elucidates the basis of MK-6240 PET in quantifying PHF deposits in AD and may facilitate the structure-based design of superior ligands against tau amyloids.

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Organizational Affiliation: 

Department of Neurology, McGill University, Montreal, QC, Canada.

Biological Assembly 1  

Global Symmetry: Helical - H  (Explore in 3D)
Global Stoichiometry: Homo 6-mer - A6 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content

• Total Structure Weight: 50.78 kDa 
• Atom Count: 3,570 
• Modelled Residue Count: 450 
• Deposited Residue Count: 450 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Microtubule-associated protein tau	A, B, C, D, E, F	75	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P10636 (Homo sapiens) Explore P10636  Go to UniProtKB:  P10636
PHAROS:  P10636 GTEx:  ENSG00000186868

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
X6R (Subject of Investigation/LOI)	G [auth A], H [auth A], I [auth B], J [auth C], K [auth C], L [auth D]	6-fluoro-3-(1H-pyrrolo[2,3-c]pyridin-1-yl)isoquinolin-5-amine C16 H11 F N4 KAXAUWZJVWGFDO-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.31 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: HELICAL 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	RELION	4.0

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2024-09-04 
Deposition Author(s): Kunach, P., Shahmoradian, S.H., Diamond, M.I., Rosa-Neto, P.

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Funding Organization	Location	Grant Number
Cancer Prevention and Research Institute of Texas (CPRIT)	United States	RP170644
National Institutes of Health/National Institute of Mental Health (NIH/NIMH)	United States	R35GM122481
Canadian Institutes of Health Research (CIHR)	Canada	MOP-11-51-31
Canadian Institutes of Health Research (CIHR)	Canada	152985

Revision History  

• Version 1.0: 2024-09-04
  Type: Initial release
  
• Version 1.1: 2024-10-23
  Changes: Data collection, Database references, Structure summary