Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 21.99 kDa 
• Atom Count: 1553 
• Modelled Residue Count: 184 
• Deposited Residue Count: 197 
• Unique protein chains: 1

2GW5

Crystal Structure of LIR-2 (ILT4) at 1.8 : differences from LIR-1 (ILT2) in regions implicated in the binding of the Cytomegalovirus class I MHC homolog UL18

• PDB DOI: 10.2210/pdb2GW5/pdb

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


• Deposited: 2006-05-03 Released: 2006-06-20 
• Deposition Author(s): Willcox, B.E., Thomas, L.M., Chapman, T.L., Heikema, A.P., West, A.P., Bjorkman, P.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.279 
• R-Value Work: 0.240 
• R-Value Observed: 0.242 

Literature

Crystal structure of LIR-2 (ILT4) at 1.8 A: differences from LIR-1 (ILT2) in regions implicated in the binding of the Human Cytomegalovirus class I MHC homolog UL18.

Willcox, B.E., Thomas, L.M., Chapman, T.L., Heikema, A.P., West, A.P., Bjorkman, P.J.

(2002) BMC Struct Biol 2: 6-6

• PubMed: 12390682 
• DOI: 10.1186/1472-6807-2-6
• Primary Citation of Related Structures:  
  2GW5


• PubMed Abstract: 
  

Leukocyte Immunoglobulin-like Receptor-1 (LIR-1) and LIR-2 (also known as ILT2 and ILT4 respectively) are highly related cell surface receptors that bind a broad range of class I MHC molecules with low (microM) affinities. Expressed on monocytic cells and macrophages, both molecules transmit inhibitory signals after binding ligands. In addition to binding host class I MHC, the LIR-1 molecule, which is also expressed on lymphoid tissues, binds with a high (nM) affinity to UL18, a class I MHC homolog encoded by Human Cytomegalovirus (HCMV). In comparison, LIR-2 binds UL18 only weakly (microM KD). To understand how HCMV preferentially targets the more broadly expressed LIR-1 molecule, we determined the crystal structure of a ligand-binding fragment of LIR-2, and compared this to the existing high-resolution crystal structure of LIR-1.

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Organizational Affiliation: 

Division of Biology 156-29, California Institute of Technology, Pasadena, California 91125, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Leukocyte immunoglobulin-like receptor subfamily B member 2 precursor	A	197	Homo sapiens	Mutation(s): 0  Gene Names: LILRB2, ILT4, LIR2, MIR10
UniProt & NIH Common Fund Data Resources
Find proteins for Q8N423 (Homo sapiens) Explore Q8N423  Go to UniProtKB:  Q8N423
PHAROS:  Q8N423

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IPA	B [auth A]	ISOPROPYL ALCOHOL C3 H8 O KFZMGEQAYNKOFK-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.279 
• R-Value Work: 0.240 
• R-Value Observed: 0.242 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 62.53	α = 90
b = 62.53	β = 90
c = 106.917	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
ADSC	data collection
SCALEPACK	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-05-03 
• Released Date: 2006-06-20 
Deposition Author(s): Willcox, B.E., Thomas, L.M., Chapman, T.L., Heikema, A.P., West, A.P., Bjorkman, P.J.

Revision History  

• Version 1.0: 2006-06-20
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-02-14
  Changes: Experimental preparation