Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A2B Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C 

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

Macromolecule Content

• Total Structure Weight: 149.95 kDa 
• Atom Count: 10749 
• Residue Count: 1315 
• Unique protein chains: 2

5DK3

Crystal Structure of Pembrolizumab, a full length IgG4 antibody

• DOI: 10.2210/pdb5DK3/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Mammalia
• Mutation(s): No 


• Deposited: 2015-09-02 Released: 2015-11-18 
• Deposition Author(s): Scapin, G., Prosise, W., Reichert, P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.28 Å
• R-Value Free: 0.224 
• R-Value Work: 0.184 
• R-Value Observed: 0.186 

Literature

Structure of full-length human anti-PD1 therapeutic IgG4 antibody pembrolizumab.

Scapin, G., Yang, X., Prosise, W.W., McCoy, M., Reichert, P., Johnston, J.M., Kashi, R.S., Strickland, C.

(2015) Nat Struct Mol Biol 22: 953-958

• PubMed: 26595420 
• DOI: 10.1038/nsmb.3129
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Immunoglobulin G4 antibodies exhibit unusual properties with important biological consequences. We report the structure of the human full-length IgG4 S228P anti-PD1 antibody pembrolizumab, solved to 2.3-Å resolution. Pembrolizumab is a compact molecule, consistent with the presence of a short hinge region. The Fc domain is glycosylated at the CH2 domain on both chains, but one CH2 domain is rotated 120° with respect to the conformation observed in all reported structures to date, and its glycan chain faces the solvent. We speculate that this new conformation is driven by the shorter hinge. The structure suggests a role for the S228P mutation in preventing the IgG4 arm exchange. In addition, this unusual Fc conformation suggests possible structural diversity between IgG subclasses and shows that use of isolated antibody fragments could mask potentially important interactions, owing to molecular flexibility.

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Organizational Affiliation: 

Structural Chemistry, Merck &Co., Inc., Kenilworth, New Jersey, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Light Chain	A, F	218	Homo sapiens	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Heavy Chain	B, G	444	Homo sapiens	Mutation(s): 0

Oligosaccharides

Entity ID: 3
Molecule	Chains	Chain Length	2D Diagram
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	C	7

Entity ID: 4
Molecule	Chains	Chain Length	2D Diagram
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose	D	7

Entity ID: 5
Molecule	Chains	Chain Length	2D Diagram
beta-D-fructofuranose-(2-1)-alpha-D-glucopyranose	E, H, I	2

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	A, B	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.28 Å
• R-Value Free: 0.224 
• R-Value Work: 0.184 
• R-Value Observed: 0.186 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.83	α = 90
b = 110.83	β = 90
c = 264.96	γ = 90

Software Package:

Software Name	Purpose
BUSTER	refinement
Aimless	data scaling
PDB_EXTRACT	data extraction
XDS	data reduction
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2015-09-02 
• Released Date: 2015-11-18 
Deposition Author(s): Scapin, G., Prosise, W., Reichert, P.

Revision History 

• Version 1.0: 2015-11-18
  Type: Initial release
  
• Version 1.1: 2016-07-06
  Changes: Database references
• Version 1.2: 2016-08-03
  Changes: Database references
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary