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Research Article

Structural determinants of growth factor binding and specificity by VEGF receptor 2

Veli-Matti Leppänen, Andrea E. Prota, Michael Jeltsch, Andrey Anisimov, Nisse Kalkkinen, Tomas Strandin, Hilkka Lankinen, Adrian Goldman, Kurt Ballmer-Hofer, and Kari Alitalo
  1. aMolecular Cancer Biology Program, Biomedicum Helsinki, Department of Pathology, Haartman Institute and Helsinki University Central Hospital, P.O. Box 63, University of Helsinki, Haartmaninkatu 8, FI-00014, Helsinki, Finland;
  2. bPaul Scherrer Institut, Biomolecular Research, CH-5232 Villigen PSI, Switzerland;
  3. cInstitute of Biotechnology, University of Helsinki, Viikinkaari 1, FI-00014 , Helsinki, Finland; and
  4. dHaartman Institute, University of Helsinki, Haartmaninkatu 3, FI-00014, Helsinki, Finland.

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PNAS first published January 22, 2010; https://doi.org/10.1073/pnas.0914318107
Veli-Matti Leppänen
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Andrea E. Prota
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Michael Jeltsch
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Andrey Anisimov
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Nisse Kalkkinen
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Tomas Strandin
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Hilkka Lankinen
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Adrian Goldman
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Kurt Ballmer-Hofer
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  • For correspondence: Kurt.Ballmer@psi.ch Kari.Alitalo@Helsinki.Fi
Kari Alitalo
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  • For correspondence: Kurt.Ballmer@psi.ch Kari.Alitalo@Helsinki.Fi
  1. ↵1V.-M.L. and A.E.P. contributed equally to this work.

  2. Communicated by Erkki Ruoslahti, Burnham Institute for Medical Research at University of California, Santa Barbara, CA, December 16, 2009 (received for review September 27, 2009)

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Abstract

Vascular endothelial growth factors (VEGFs) regulate blood and lymph vessel formation through activation of three receptor tyrosine kinases, VEGFR-1, -2, and -3. The extracellular domain of VEGF receptors consists of seven immunoglobulin homology domains, which, upon ligand binding, promote receptor dimerization. Dimerization initiates transmembrane signaling, which activates the intracellular tyrosine kinase domain of the receptor. VEGF-C stimulates lymphangiogenesis and contributes to pathological angiogenesis via VEGFR-3. However, proteolytically processed VEGF-C also stimulates VEGFR-2, the predominant transducer of signals required for physiological and pathological angiogenesis. Here we present the crystal structure of VEGF-C bound to the VEGFR-2 high-affinity-binding site, which consists of immunoglobulin homology domains D2 and D3. This structure reveals a symmetrical 2∶2 complex, in which left-handed twisted receptor domains wrap around the 2-fold axis of VEGF-C. In the VEGFs, receptor specificity is determined by an N-terminal alpha helix and three peptide loops. Our structure shows that two of these loops in VEGF-C bind to VEGFR-2 subdomains D2 and D3, while one interacts primarily with D3. Additionally, the N-terminal helix of VEGF-C interacts with D2, and the groove separating the two VEGF-C monomers binds to the D2/D3 linker. VEGF-C, unlike VEGF-A, does not bind VEGFR-1. We therefore created VEGFR-1/VEGFR-2 chimeric proteins to further study receptor specificity. This biochemical analysis, together with our structural data, defined VEGFR-2 residues critical for the binding of VEGF-A and VEGF-C. Our results provide significant insights into the structural features that determine the high affinity and specificity of VEGF/VEGFR interactions.

  • angiogenesis
  • lymphangiogenesis
  • vascular endothelial growth factor C
  • vascular endothelial growth factor receptor-2

Footnotes

  • 2To whom correspondence may be addressed: E-mail: Kurt.Ballmer{at}psi.ch or Kari.Alitalo{at}Helsinki.Fi.
  • Author contributions: V.-M.L., A.E.P., M.J., K.B.-H., and K.A. designed research; V.-M.L., A.E.P., M.J., A.A., N.K., T.S., H.L., A.G., K.B.-H., and K.A. performed research and analyzed data; and V.-M.L., A.E.P., K.B.-H., and K.A. wrote the paper.

  • The authors declare no conflict of interest.

  • Data deposition: The coordinates and structure factors have been deposited in the Protein Data Bank, www.pdb.org (PDB ID codes 2x1x and 2x1w).

  • This article contains supporting information online at www.pnas.org/cgi/content/full/0914318107/DCSupplemental.

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Structural determinants of growth factor binding and specificity by VEGF receptor 2
Veli-Matti Leppänen, Andrea E. Prota, Michael Jeltsch, Andrey Anisimov, Nisse Kalkkinen, Tomas Strandin, Hilkka Lankinen, Adrian Goldman, Kurt Ballmer-Hofer, Kari Alitalo
Proceedings of the National Academy of Sciences Jan 2010, DOI: 10.1073/pnas.0914318107

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Structural determinants of growth factor binding and specificity by VEGF receptor 2
Veli-Matti Leppänen, Andrea E. Prota, Michael Jeltsch, Andrey Anisimov, Nisse Kalkkinen, Tomas Strandin, Hilkka Lankinen, Adrian Goldman, Kurt Ballmer-Hofer, Kari Alitalo
Proceedings of the National Academy of Sciences Jan 2010, DOI: 10.1073/pnas.0914318107
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