Two-stage interaction of the tumor nursing galectin-1 with the antiangiogenic peptide anginex

Zsófia Hegedüs, Edit Wéber, Lea Végh, Balázs Váczi, Vilmos Tubak, Éva Kriston-Pál, Z. Kele, E. Monostori, T. Martinek

Research output: Contribution to journalArticle

Abstract

The 33mer peptide anginex is a potent inhibitor of angiogenesis and tumor growth. Its biological activity is dependent on the β-galactoside-binding protein galectin-1 (gal-1), which has been reported to be the main receptor for anginex. The gal-1-anginex interaction has been observed using surface plasmon resonance and mass spectrometric methods, but the stoichiometry and affinity in the solution remain elusive. Our aim was to characterize the gal-1-anginex interaction via isothermal titration calorimetry. In order to ensure protein purity and integrity, native gel electrophoresis, Western blot analysis, mass spectrometric measurements, and ultracentrifugation were carried out for the recombinant wild-type human gal-1 and V5D gal-1 expressed in E. coli. Two stages were identified in the titration curves: (i) formation of a 4:1 galectin-1-anginex complex with low nM affinity, and (ii) a complex with 1:1 stoichiometry exhibiting K D > 200 nM. The 4:1 complex was robust at different concentrations, and neither the oxidation state nor the V5D mutation (a monomeric gal-1 mutant) of gal-1 affected this stoichiometry. The presence of the high-affinity 4:1 interaction may have implications for the biological applications of anginex.

Original languageEnglish
Pages (from-to)449-456
Number of pages8
JournalJournal of Thermal Analysis and Calorimetry
Volume120
Issue number1
DOIs
Publication statusPublished - Mar 30 2015

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Keywords

  • Anginex
  • Angiogenesis
  • Galectin-1
  • Isothermal titration calorimetry

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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