4GS7

Structure of the Interleukin-15 quaternary complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Mechanistic and structural insight into the functional dichotomy between IL-2 and IL-15.

Ring, A.M.Lin, J.X.Feng, D.Mitra, S.Rickert, M.Bowman, G.R.Pande, V.S.Li, P.Moraga, I.Spolski, R.Ozkan, E.Leonard, W.J.Garcia, K.C.

(2012) Nat.Immunol. 13: 1187-1195

  • DOI: 10.1038/ni.2449

  • PubMed Abstract: 
  • Interleukin 15 (IL-15) and IL-2 have distinct immunological functions even though both signal through the receptor subunit IL-2Rβ and the common γ-chain (γ(c)). Here we found that in the structure of the IL-15-IL-15Rα-IL-2Rβ-γ(c) quaternary complex, ...

    Interleukin 15 (IL-15) and IL-2 have distinct immunological functions even though both signal through the receptor subunit IL-2Rβ and the common γ-chain (γ(c)). Here we found that in the structure of the IL-15-IL-15Rα-IL-2Rβ-γ(c) quaternary complex, IL-15 binds to IL-2Rβ and γ(c) in a heterodimer nearly indistinguishable from that of the IL-2-IL-2Rα-IL-2Rβ-γ(c) complex, despite their different receptor-binding chemistries. IL-15Rα substantially increased the affinity of IL-15 for IL-2Rβ, and this allostery was required for IL-15 trans signaling. Consistent with their identical IL-2Rβ-γ(c) dimer geometries, IL-2 and IL-15 showed similar signaling properties in lymphocytes, with any differences resulting from disparate receptor affinities. Thus, IL-15 and IL-2 induced similar signals, and the cytokine specificity of IL-2Rα versus IL-15Rα determined cellular responsiveness. Our results provide new insights for the development of specific immunotherapeutics based on IL-15 or IL-2.


    Organizational Affiliation

    Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Interleukin-15
A
116Homo sapiensMutation(s): 0 
Gene Names: IL15
Find proteins for P40933 (Homo sapiens)
Go to Gene View: IL15
Go to UniProtKB:  P40933
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Interleukin-2 receptor subunit beta
B
217Homo sapiensMutation(s): 3 
Gene Names: IL2RB (IL15RB)
Find proteins for P14784 (Homo sapiens)
Go to Gene View: IL2RB
Go to UniProtKB:  P14784
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Cytokine receptor common subunit gamma
C
203Homo sapiensMutation(s): 1 
Gene Names: IL2RG
Find proteins for P31785 (Homo sapiens)
Go to Gene View: IL2RG
Go to UniProtKB:  P31785
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Interleukin-15 receptor subunit alpha
D
69Homo sapiensMutation(s): 0 
Gene Names: IL15RA
Find proteins for Q13261 (Homo sapiens)
Go to Gene View: IL15RA
Go to UniProtKB:  Q13261
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
C
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
B, C
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MLY
Query on MLY
A, B, C
L-PEPTIDE LINKINGC8 H18 N2 O2LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 70.949α = 90.00
b = 74.610β = 90.00
c = 129.211γ = 90.00
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
HKL-3000data scaling
PHENIXrefinement
HKL-3000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-11-07
    Type: Initial release
  • Version 1.1: 2012-11-14
    Type: Database references
  • Version 1.2: 2012-12-05
    Type: Database references