3QS9

Crystal structure of a human Flt3 ligand-receptor ternary complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 7.8 Å
  • R-Value Free: 0.346 
  • R-Value Work: 0.337 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural insights into the extracellular assembly of the hematopoietic Flt3 signaling complex.

Verstraete, K.Vandriessche, G.Januar, M.Elegheert, J.Shkumatov, A.V.Desfosses, A.Van Craenenbroeck, K.Svergun, D.I.Gutsche, I.Vergauwen, B.Savvides, S.N.

(2011) Blood 118: 60-68

  • DOI: 10.1182/blood-2011-01-329532
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The class III receptor tyrosine kinase (RTKIII) Fms-like tyrosine kinase receptor 3 (Flt3) and its cytokine ligand (FL) play central roles in hematopoiesis and the immune system, by establishing signaling cascades crucial for the development and home ...

    The class III receptor tyrosine kinase (RTKIII) Fms-like tyrosine kinase receptor 3 (Flt3) and its cytokine ligand (FL) play central roles in hematopoiesis and the immune system, by establishing signaling cascades crucial for the development and homeostasis of hematopoietic progenitors and antigen-presenting dendritic cells. However, Flt3 is also one of the most frequently mutated receptors in hematologic malignancies and is currently a major prognostic factor and clinical target for acute myeloid leukemia. Here, we report the structural basis for the Flt3 ligand-receptor complex and unveil an unanticipated extracellular assembly unlike any other RTKIII/V complex characterized to date. FL induces dimerization of Flt3 via a remarkably compact binding epitope localized at the tip of extracellular domain 3 of Flt3, and it invokes a ternary complex devoid of homotypic receptor interactions. Comparisons of Flt3 with homologous receptors and available mutagenesis data for FL have allowed us to rationalize the unique features of the Flt3 extracellular assembly. Furthermore, thermodynamic dissection of complex formation points to a pronounced enthalpically driven binding event coupled to an entropic penalty. Together, our data suggest that the high-affinity Flt3:FL complex is driven in part by a single preformed binding epitope on FL reminiscent of a "lock-and-key" binding mode, thereby setting the stage for antagonist design.


    Related Citations: 
    • Inducible production of human Flt3 ectodomain variants in mammalian cells and preliminary crystallographic analysis of Flt3 ligand-receptor complexes
      Verstraete, K.,Vandriessche, G.,Januar, M.,Elegheert, J.,Shkumatov, A.,Desfosses, A.,Van Craenenbroeck, K.,Svergun, D.,Gutsche, I.,Vergauwen, B.,Savvides, S.N.
      () TO BE PUBLISHED --: --
    • Efficient production of bioactive recombinant human Flt3 ligand in E. coli.
      Verstraete, K.,Koch, S.,Ertugrul, S.,Vandenberghe, I.,Aerts, M.,Vandriessche, G.,Thiede, C.,Savvides, S.N.
      (2009) Protein J. 28: 57


    Organizational Affiliation

    Unit for Structural Biology, Laboratory for Protein Biochemistry and Biomolecular Engineering (L-ProBE), Ghent University, Ghent, Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SL cytokine
A, B, C, D
138Homo sapiensMutation(s): 0 
Gene Names: FLT3LG
Find proteins for P49771 (Homo sapiens)
Go to Gene View: FLT3LG
Go to UniProtKB:  P49771
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
FL cytokine receptor
E, F, G, H
527Homo sapiensMutation(s): 0 
Gene Names: FLT3 (CD135, FLK2, STK1)
EC: 2.7.10.1
Find proteins for P36888 (Homo sapiens)
Go to Gene View: FLT3
Go to UniProtKB:  P36888
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 7.8 Å
  • R-Value Free: 0.346 
  • R-Value Work: 0.337 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 124.750α = 90.00
b = 153.550β = 94.57
c = 133.870γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
BUSTERrefinement
BUSTER-TNTrefinement
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-03-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-07-20
    Type: Database references