【Tokushima University】Mechanism of "Molecular Switch" Controlling Transcription Factor Hub Formation via Phase Separation Uncovered ~Structural Fluctuations Control Molecular Assembly of Transcription Factors~

Researchers at Tokushima University have clarified the mechanism by which the transcription factor Hsf1 is activated through phase separation, revealing that DNA binding alters the protein's structural fluctuations, acting as a molecular switch. This discovery could lead to new drug development strategies for diseases linked to transcription factor dysfunction.
Scientific DiscoveryNQ 95/100出典：PR Times

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  • 📰 Published: May 20, 2026 at 20:00
  • 🔍 Collected: May 20, 2026 at 11:31
  • 🤖 AI Analyzed: May 22, 2026 at 18:05 (54h 33m after Collected)
A research group from Tokushima University and Hokkaido University has elucidated the detailed molecular mechanism by which Heat Shock Transcription Factor 1 (Hsf1), which protects cells from stress, is activated upon binding to DNA. Normally, Hsf1 exists in a self-inhibited state, but when DNA binds, the structural flexibility of its DNA-binding domain increases. This change releases a previously bound intrinsically disordered region (IDR), promoting interactions between IDRs and triggering biomolecular phase separation. This process efficiently gathers transcription factors to activate cell-protective genes. This study reveals at an atomic level how a local DNA binding event is converted into a widespread phenomenon like phase separation, and is expected to lead to new drug discovery concepts targeting the structural equilibrium of transcription factors.

FAQ

What is the main discovery of this research?

The research discovered the 'molecular switch' mechanism that activates the transcription factor Hsf1. DNA binding changes the protein's atomic-level structural fluctuations, which releases an auto-inhibitory part and triggers phase separation, leading to its activation.

What is Hsf1 and why is it important?

Hsf1 (Heat Shock Transcription Factor 1) is a master transcription factor that activates genes to protect cells from stress. Its abnormal activity is linked to diseases like cancer (over-activation) and neurodegenerative disorders (under-activation).

What is 'biomolecular phase separation' in this context?

It is a process where Hsf1 proteins gather to form droplet-like compartments without a membrane. This concentration of transcription factors at specific DNA sites efficiently activates genes that protect the cell.

How does DNA binding act as a switch for Hsf1?

Normally, Hsf1 is in a self-inhibited state. When it binds to DNA, the structure of its DNA-binding domain (DBD) becomes more flexible. This change releases an intrinsically disordered region (IDR), allowing the IDRs of multiple Hsf1 proteins to interact and drive phase separation.

What are the potential applications of this finding?

This discovery could lead to new drug development strategies. Instead of blocking DNA binding directly, which can have side effects, it may be possible to develop drugs that control the structural fluctuations of transcription factors to precisely regulate their activity, offering a new approach for diseases caused by their malfunction.

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