A Zn2-Cys6 transcription factor, TgZct4, reprograms antioxidant activity in the fungus Trichoderma guizhouense to defend against oxidative stress
- Author: mycolabadmin
- 10/15/2025
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Summary
This research identifies a special protein called TgZct4 in a beneficial fungus called Trichoderma guizhouense that helps it survive harmful stress from hydrogen peroxide. When the fungus encounters oxidative stress, TgZct4 quickly activates and switches on genes that produce protective enzymes. This discovery helps scientists understand how this fungus can be such an effective biological pest control agent and could lead to improvements in using it as a natural alternative to chemical pesticides.
Background
Trichoderma guizhouense is a biocontrol fungus that exhibits notable resistance to oxidative stress in competitive soil environments. The mechanisms governing antioxidant response specificity and adequacy in fungi remain poorly understood, despite their ecological and agricultural importance.
Objective
This study characterizes a previously unidentified antioxidant-related Zn2-Cys6 transcription factor, TgZct4, in T. guizhouense and investigates its role in regulating responses to oxidative stress induced by hydrogen peroxide.
Results
TgZct4 exhibits rapid and persistent upregulation in response to H2O2 stress with expression correlating to H2O2 concentration. Deletion of Tgzct4 significantly increased sensitivity to oxidative stress, while complementation rescued the phenotype. TgZct4 reprograms antioxidant activity by upregulating catalases TgCat1 and TgCat2, with TgCat2 being a direct transcriptional target.
Conclusion
TgZct4 functions as a key transcriptional regulator of oxidative stress responses in T. guizhouense, controlling classic antioxidant enzyme expression. These findings enhance understanding of fungal stress tolerance mechanisms and may facilitate genetic improvements of this biocontrol agent.
- Published in:Communications Biology,
- Study Type:Experimental Research,
- Source: PMID: 41094151