1IEB

HISTOCOMPATIBILITY ANTIGEN

• PDB DOI: https://doi.org/10.2210/pdb1IEB/pdb

• Classification: HISTOCOMPATIBILITY ANTIGEN
• Organism(s): Mus musculus
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 1996-04-05 Released: 1997-06-05 
• Deposition Author(s): Fremont, D.H., Hendrickson, W.A., Marrack, P., Kappler, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.321 
• R-Value Work: 0.222 
• R-Value Observed: 0.222 

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Biological Assembly 3  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 3 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 98.69 kDa 
• Atom Count: 6,672 
• Modelled Residue Count: 792 
• Deposited Residue Count: 838 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MHC CLASS II I-EK	A, C	192	Mus musculus	Mutation(s): 0
UniProt
Find proteins for P01904 (Mus musculus) Explore P01904  Go to UniProtKB:  P01904

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
MHC CLASS II I-EK	B, D	227	Mus musculus	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for Q31164 (Mus musculus) Explore Q31164  Go to UniProtKB:  Q31164
IMPC:  MGI:95901

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	E [auth A], F [auth A], G [auth B], H [auth C], I [auth C], J [auth D]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
SO4	K [auth D]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.321 
• R-Value Work: 0.222 
• R-Value Observed: 0.222 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 77.53	α = 90
b = 77.53	β = 90
c = 319.48	γ = 120

Software Package:

Software Name	Purpose
HKL	data collection
DENZO	data reduction
SCALA	data scaling
Agrovata	data reduction
X-PLOR	model building
X-PLOR	refinement
HKL	data reduction
CCP4	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-06-05 
Deposition Author(s): Fremont, D.H., Hendrickson, W.A., Marrack, P., Kappler, J.

Revision History  

• Version 1.0: 1997-06-05
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Refinement description, Structure summary
• Version 2.1: 2023-08-09
  Changes: Database references, Refinement description, Structure summary