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Updated: Jan 7, 2026

A Modified Yeast-one Hybrid System for Heteromeric Protein Complex-DNA Interaction Studies
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The CRY1-HsF predicted interaction interface serves as a molecular platform for bioengineering or selecting

Souleïmen Jmii1,2,3, William Bouard4, Gabriel Marcotte1,2,3

  • 1Department of Chemistry, Université du Québec à Montréal, Montréal, QC, Canada.

Frontiers in Plant Science
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Summary

Plant cryptochrome CRY1 interacts with Heat shock Factor (HsF) proteins, enhancing thermal stress tolerance. This discovery aids in developing crops with improved resilience to high temperatures.

Keywords:
ArabidopsisCRY1HsFbioengineeringmutantsprotein-protein interactionsstructure prediction

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Area of Science:

  • Plant molecular biology
  • Stress physiology
  • Biochemistry

Background:

  • High-temperature stress negatively impacts plant growth and agricultural productivity.
  • Heat shock Factor (HsF) proteins are key transcription factors activated by heat stress to maintain proteostasis.
  • Cryptochrome CRY1 is involved in plant responses to environmental stimuli.

Purpose of the Study:

  • To investigate the molecular interaction between plant cryptochrome CRY1 and Heat shock Factor (HsF) proteins.
  • To elucidate the structural basis of CRY1-HsF interactions.
  • To identify potential targets for improving plant thermal stress tolerance.

Main Methods:

  • Structural predictions using computational modeling.
  • Experimental validation using yeast-two-hybrid assays.
  • Bimolecular fluorescence complementation (BiFC) assays to confirm protein interactions in vivo.

Main Results:

  • CRY1's PHR domain interacts with the HR-A region of multiple HsF proteins.
  • Specific residues in CRY1 (W352) and HsF proteins (e.g., glutamate in HsFA3) are crucial for interaction.
  • Mutations enhancing CRY1 interaction with HsFA1e and HsFC1 were identified.

Conclusions:

  • The CRY1-HsF interaction is a significant mechanism for plant thermal stress tolerance.
  • Understanding this interaction provides a basis for engineering improved heat-resilient crops.
  • Identified mutant candidates can be utilized in crop selection and bioengineering strategies.