Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 85.74 kDa 
• Atom Count: 5699 
• Residue Count: 697 
• Unique protein chains: 2

1LQS

CRYSTAL STRUCTURE OF HUMAN CYTOMEGALOVIRUS IL-10 BOUND TO SOLUBLE HUMAN IL-10R1

• DOI: 10.2210/pdb1LQS/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens, Human betaherpesvirus 5
• Expression System: Drosophila melanogaster
• Mutation(s): Yes 


• Deposited: 2002-05-13 Released: 2002-07-17 
• Deposition Author(s): Jones, B.C., Logsdon, N.J., Josephson, K., Cook, J., Barry, P.A., Walter, M.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.294 
• R-Value Work: 0.244 

Literature

Crystal structure of human cytomegalovirus IL-10 bound to soluble human IL-10R1.

Jones, B.C., Logsdon, N.J., Josephson, K., Cook, J., Barry, P.A., Walter, M.R.

(2002) Proc Natl Acad Sci U S A 99: 9404-9409

• PubMed: 12093920 
• DOI: 10.1073/pnas.152147499
• Primary Citation of Related Structures:  
  1LQS


• PubMed Abstract: 
  

Human IL-10 (hIL-10) modulates critical immune and inflammatory responses by way of interactions with its high- (IL-10R1) and low-affinity (IL-10R2) cell surface receptors. Human cytomegalovirus exploits the IL-10 signaling pathway by expressing a functional viral IL-10 homolog (cmvIL-10), which shares only 27% sequence identity with hIL-10 yet signals through IL-10R1 and IL-10R2. To define the molecular basis of this virus-host interaction, we determined the 2.7-A crystal structure of cmvIL-10 bound to the extracellular fragment of IL-10R1 (sIL-10R1). The structure reveals cmvIL-10 forms a disulfide-linked homodimer that binds two sIL-10R1 molecules. Although cmvIL-10 and hIL-10 share similar intertwined topologies and sIL-10R1 binding sites, their respective interdomain angles differ by approximately 40 degrees. This difference results in a striking re-organization of the IL-10R1s in the putative cell surface complex. Solution binding studies show cmvIL-10 and hIL-10 share essentially identical affinities for sIL-10R1 whereas the Epstein-Barr virus IL-10 homolog (ebvIL-10), whose structure is highly similar to hIL-10, exhibits a approximately 20-fold reduction in sIL-10R1 affinity. Our results suggest cmvIL-10 and ebvIL-10 have evolved different molecular mechanisms to engage the IL-10 receptors that ultimately enhance the respective ability of their virus to escape immune detection.

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Organizational Affiliation: 

Center for Biophysical Sciences and Engineering, Department of Microbiology, University of Alabama, 1025 18th Street South, Birmingham, AL 35294, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
INTERLEUKIN-10 RECEPTOR ALPHA CHAIN	R, S	214	Homo sapiens	Mutation(s): 6  Gene Names: IL10RA, IL10R
Find proteins for Q13651 (Homo sapiens) Explore Q13651  Go to UniProtKB:  Q13651
NIH Common Fund Data Resources
PHAROS  Q13651 GTEx  ENSG00000110324

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
INTERLEUKIN-10-LIKE PROTEIN	L, M	157	Human betaherpesvirus 5	Mutation(s): 0
Find proteins for P17150 (Human cytomegalovirus (strain AD169)) Explore P17150  Go to UniProtKB:  P17150

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	L, M	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.294 
• R-Value Work: 0.244 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 114.29	α = 90
b = 104.68	β = 106.49
c = 91.89	γ = 90

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-05-13 
• Released Date: 2002-07-17 
Deposition Author(s): Jones, B.C., Logsdon, N.J., Josephson, K., Cook, J., Barry, P.A., Walter, M.R.

Revision History 

• Version 1.0: 2002-07-17
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.3: 2017-10-11
  Changes: Refinement description
• Version 1.4: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary