2PSM

Crystal structure of Interleukin 15 in complex with Interleukin 15 receptor alpha


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal Structure of the Interleukin-15{middle dot}Interleukin-15 Receptor {alpha} Complex: INSIGHTS INTO TRANS AND CIS PRESENTATION

Olsen, S.K.Ota, N.Kishishita, S.Kukimoto-Niino, M.Murayama, K.Uchiyama, H.Toyama, M.Terada, T.Shirouzu, M.Kanagawa, O.Yokoyama, S.

(2007) J.Biol.Chem. 282: 37191-37204

  • DOI: 10.1074/jbc.M706150200

  • PubMed Abstract: 
  • Interleukin (IL)-15 is a pleiotropic cytokine that plays a pivotal role in both innate and adaptive immunity. IL-15 is unique among cytokines due to its participation in a trans signaling mechanism in which IL-15 receptor alpha (IL-15Ralpha) from one ...

    Interleukin (IL)-15 is a pleiotropic cytokine that plays a pivotal role in both innate and adaptive immunity. IL-15 is unique among cytokines due to its participation in a trans signaling mechanism in which IL-15 receptor alpha (IL-15Ralpha) from one subset of cells presents IL-15 to neighboring IL-2Rbeta/gammac-expressing cells. Here we present the crystal structure of IL-15 in complex with the sushi domain of IL-15Ralpha. The structure reveals that the alpha receptor-binding epitope of IL-15 adopts a unique conformation, which, together with amino acid substitutions, permits specific interactions with IL-15Ralpha that account for the exceptionally high affinity of the IL-15.IL-15Ralpha complex. Interestingly, analysis of the topology of IL-15 and IL-15Ralpha at the IL-15.IL-15Ralpha interface suggests that IL-15 should be capable of participating in a cis signaling mechanism similar to that of the related cytokine IL-2. Indeed, we present biochemical data demonstrating that IL-15 is capable of efficiently signaling in cis through IL-15Ralpha and IL-2Rbeta/gammac expressed on the surface of a single cell. Based on our data we propose that cis presentation of IL-15 may be important in certain biological contexts and that flexibility of IL-15Ralpha permits IL-15 and its three receptor components to be assembled identically at the ligand-receptor interface whether IL-15 is presented in cis or trans. Finally, we have gained insights into IL-15.IL-15Ralpha.IL-2Rbeta.gammac quaternary complex assembly through the use of molecular modeling.


    Organizational Affiliation

    RIKEN Genomic Sciences Center, RIKEN Yokohama Institute, Kanagawa, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Interleukin-15
A, B
121Mus musculusGene Names: Il15
Find proteins for P48346 (Mus musculus)
Go to UniProtKB:  P48346
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Interleukin-15 receptor alpha chain
F, C
78Mus musculusGene Names: Il15ra
Find proteins for Q60819 (Mus musculus)
Go to UniProtKB:  Q60819
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BAM
Query on BAM

Download SDF File 
Download CCD File 
B
BENZAMIDINE
C7 H9 N2
PXXJHWLDUBFPOL-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.224 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 118.450α = 90.00
b = 118.450β = 90.00
c = 76.110γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data scaling
SOLVEphasing
HKL-2000data reduction
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-11-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance