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Deciphering the Stepwise Binding Mode of HRG1β to HER3 by Surface Plasmon Resonance and Interaction Map

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  • Carmen Peess
  • Leopold von Proff
  • Sabine Goller
  • Karl Andersson
  • Michael Gerg
  • Magnus Malmqvist
  • Birgit Bossenmaier
  • Michael Schräml

Abstract

For the development of efficient anti-cancer therapeutics against the HER receptor family it is indispensable to understand the mechanistic model of the HER receptor activation upon ligand binding. Due to its high complexity the binding mode of Heregulin 1 beta (HRG1β) with its receptor HER3 is so far not understood. Analysis of the interaction of HRG1β with surface immobilized HER3 extracellular domain by time-resolved Surface Plasmon Resonance (SPR) was so far not interpretable using any regular analysis method as the interaction was highly complex. Here, we show that Interaction Map (IM) made it possible to shed light on this interaction. IM allowed deciphering the rate limiting kinetic contributions from complex SPR sensorgrams and thereby enabling the extraction of discrete kinetic rate components from the apparently heterogeneous interactions. We could resolve details from the complex avidity-driven binding mode of HRG1β with HER3 by using a combination of SPR and IM data. Our findings contribute to the general understanding that a major conformational change of HER3 during its activation is induced by a complex sequential HRG1β docking mode.

Suggested Citation

  • Carmen Peess & Leopold von Proff & Sabine Goller & Karl Andersson & Michael Gerg & Magnus Malmqvist & Birgit Bossenmaier & Michael Schräml, 2015. "Deciphering the Stepwise Binding Mode of HRG1β to HER3 by Surface Plasmon Resonance and Interaction Map," PLOS ONE, Public Library of Science, vol. 10(2), pages 1-13, February.
    • Handle: RePEc:plo:pone00:0116870
    DOI: 10.1371/journal.pone.0116870
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    References listed on IDEAS

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    1. Hyun-Soo Cho & Karen Mason & Kasra X. Ramyar & Ann Marie Stanley & Sandra B. Gabelli & Dan W. Denney & Daniel J. Leahy, 2003. "Structure of the extracellular region of HER2 alone and in complex with the Herceptin Fab," Nature, Nature, vol. 421(6924), pages 756-760, February.
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