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Updated: May 22, 2025

2 in 1: One-step Affinity Purification for the Parallel Analysis of Protein-Protein and Protein-Metabolite Complexes
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ARR1 and AHP interactions in the multi-step phosphorelay system.

Linh H Tran1, Milosz Ruszkowski1

  • 1Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan, Poland.

Frontiers in Plant Science
|March 14, 2025
PubMed
Summary

Plants utilize multi-step phosphorelay (MSP) systems for signaling. This study reveals that ARR1 interacts with multiple histidine-containing phosphotransfer proteins (AHPs), suggesting ARR1 acts as a signaling hub.

Keywords:
cytokinin signaling pathwayhistidine-containing phosphotransfer proteinmulti-step phosphorelayresponse regulatorsignaling cascade

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Area of Science:

  • Plant molecular biology
  • Signal transduction pathways
  • Biochemistry

Background:

  • Plants employ multi-step phosphorelay (MSP) systems to respond to various stimuli.
  • MSP signaling involves sequential phosphorylation events crucial for transmitting signals.
  • Phytohormones like cytokinin and ethylene are known activators, but non-hormonal pathways also exist.

Purpose of the Study:

  • To investigate the structural and biophysical characteristics of the AHP1/ARR1 complex in *Arabidopsis thaliana*.
  • To elucidate the interaction dynamics between histidine-containing phosphotransfer proteins (AHPs) and response regulators (ARRs).
  • To understand the role of ARR1 in signal integration and cross-talk modulation within MSP pathways.

Main Methods:

  • Comparative affinity analysis of ARR1 with all five active AHPs.
  • Structural and biophysical characterization of protein complexes.
  • Bioinformatic analysis of existing experimental data on AHP oligomerization.

Main Results:

  • ARR1 exhibits a modest, two-fold higher binding affinity for AHP1 compared to other AHPs.
  • ARR1 can interact with AHP2-5, indicating potential for broad signaling integration.
  • Analysis suggests that free AHPs are predominantly monomeric.

Conclusions:

  • ARR1 acts as a central signaling node, potentially modulating cross-talk between different MSP pathways.
  • The interaction profile of ARR1 with multiple AHPs highlights its role in integrating diverse plant signals.
  • Understanding these molecular interactions is key to deciphering complex plant responses.