Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1BC Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 3-mer - A2B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 50.17 kDa 
• Atom Count: 3580 
• Residue Count: 432 
• Unique protein chains: 3

5E2W

Anti-TAU AT8 FAB with triply phosphorylated TAU peptide

• DOI: 10.2210/pdb5E2W/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Mus musculus, Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2015-10-01 Released: 2016-02-24 
• Deposition Author(s): Malia, T., Teplyakov, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.220 
• R-Value Work: 0.216 
• R-Value Observed: 0.216 

Literature

Epitope mapping and structural basis for the recognition of phosphorylated tau by the anti-tau antibody AT8.

Malia, T.J., Teplyakov, A., Ernst, R., Wu, S.J., Lacy, E.R., Liu, X., Vandermeeren, M., Mercken, M., Luo, J., Sweet, R.W., Gilliland, G.L.

(2016) Proteins 84: 427-434

• PubMed: 26800003 
• DOI: 10.1002/prot.24988
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Microtubule-associated protein tau becomes abnormally phosphorylated in Alzheimer's disease and other tauopathies and forms aggregates of paired helical filaments (PHF-tau). AT8 is a PHF-tau-specific monoclonal antibody that is a commonly used marker of neuropathology because of its recognition of abnormally phosphorylated tau. Previous reports described the AT8 epitope to include pS202/pT205. Our studies support and extend previous findings by also identifying pS208 as part of the binding epitope. We characterized the phosphoepitope of AT8 through both peptide binding studies and costructures with phosphopeptides. From the cocrystal structure of AT8 Fab with the diphosphorylated (pS202/pT205) peptide, it appeared that an additional phosphorylation at S208 would also be accommodated by AT8. Phosphopeptide binding studies showed that AT8 bound to the triply phosphorylated tau peptide (pS202/pT205/pS208) 30-fold stronger than to the pS202/pT205 peptide, supporting the role of pS208 in AT8 recognition. We also show that the binding kinetics of the triply phosphorylated peptide pS202/pT205/pS208 was remarkably similar to that of PHF-tau. The costructure of AT8 Fab with a pS202/pT205/pS208 peptide shows that the interaction interface involves all six CDRs and tau residues 202-209. All three phosphorylation sites are recognized by AT8, with pT205 acting as the anchor. Crystallization of the Fab/peptide complex under acidic conditions shows that CDR-L2 is prone to unfolding and precludes peptide binding, and may suggest a general instability in the antibody.

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Organizational Affiliation: 

Janssen Research & Development, LLC, 1400 McKean Road, Spring House, Pennsylvania, 19477.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
AT8 LIGHT CHAIN	L	219	Mus musculus	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
AT8 HEAVY CHAIN	H	222	Mus musculus	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
TAU-PHOSPHOPEPTIDE	P	18	Homo sapiens	Mutation(s): 0  Gene Names: MAPT, MAPTL, MTBT1, TAU
Find proteins for P10636 (Homo sapiens) Go to UniProtKB:  P10636
NIH Common Fund Data Resources
PHAROS  P10636 GTEx  ENSG00000186868

Small Molecules

Modified Residues  2 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SEP	P	L-PEPTIDE LINKING	C3 H8 N O6 P		SER
TPO	P	L-PEPTIDE LINKING	C4 H10 N O6 P		THR

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.220 
• R-Value Work: 0.216 
• R-Value Observed: 0.216 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 115.62	α = 90
b = 61.02	β = 133.11
c = 84.12	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data reduction
HKL-2000	data scaling
REFMAC	refinement
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2015-10-01 
• Released Date: 2016-02-24 
Deposition Author(s): Malia, T., Teplyakov, A.

Revision History 

• Version 1.0: 2016-02-24
  Type: Initial release
  
• Version 1.1: 2016-03-30
  Changes: Database references