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Updated: Mar 18, 2026
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Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
Published on: May 26, 2011
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Oligomerization-competent PIF4 drives thermomorphogenesis through functional redundancy in transactivation and DNA
Haibo Xiong1, Abhishesh Bajracharya1, Ranjeeta Odari1
1Department of Biology, University of Mississippi, University, MS, USA.
Nature Communications
|March 17, 2026
Summary
PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) enables plants to adapt architecture to warmth. Its basic segment drives condensate formation, crucial for thermo-induced growth, suggesting PIF4 oligomerization is key for plant temperature response.
Area of Science:
- Plant Biology
- Molecular Biology
- Genetics
Background:
- Plants exhibit thermomorphogenesis, altering architecture in response to temperature.
- PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) is a key transcription factor regulating this process.
Purpose of the Study:
- To investigate the roles of structured and disordered regions of PIF4 in thermomorphogenesis.
- To understand how PIF4's physical properties, like condensate formation, relate to its function.
Main Methods:
- Analysis of PIF4's intrinsically disordered region (IDR), transactivation domain (TAD), and basic helix-loop-helix (bHLH) domain.
- Site-directed mutagenesis to disrupt transactivation, DNA binding, and phase separation.
- Phenotypic analysis of hypocotyl elongation under varying temperatures.
Main Results:
- The basic segment of PIF4 is essential for condensate formation, while the TAD modulates condensate properties.
- Disrupting TAD function or phase separation did not significantly affect thermomorphogenesis.
- Mutations in the basic segment that impair DNA binding and oligomerization abolished thermo-induced hypocotyl elongation.
Conclusions:
- PIF4's oligomerization competence, driven by its basic segment, is critical for thermomorphogenesis.
- This oligomerization likely facilitates partner recruitment, enabling DNA binding and transactivation in trans.
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