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Hypothetical protein MAA_07646 is required for stress resistance and pathogenicity in Metarhizium robertsii
MingYue Chen1, YaShuai Yu1, YouMin Tong1
1Anhui Provincial Key Laboratory of Microbial Pest Control, Anhui Agricultural University, Hefei, 230036, China.
Abstract:
Metarhizium robertsii, a vital entomopathogenic fungus for pest management, relies on various virulence-related proteins for infection. Identifying these proteins, especially those with unknown functions, can illuminate the fungus's virulence mechanisms. Through RNA-seq, we discovered that the hypothetical protein MAA_07646 was significantly upregulated during appressorium formation in M. robertsii. In this study, we characterized MAA_07646, finding its presence in both the nucleus and cytoplasm. Surprisingly, it did not affect vegetative growth, conidiation, or chemical tolerance. However, it played a role in heat and UV radiation sensitivity. Notably, ΔMAA_07646 exhibited reduced virulence in Galleria mellonella larvae due to impaired appressorium formation and decreased expression of virulence-related genes. In conclusion, MAA_07646 contributes to thermotolerance, UV resistance, and virulence in M. robertsii. Understanding its function sheds light on the insecticidal potential of M. robertsii's hypothetical proteins.
Insights
A hypothetical protein, MAA_07646, in Metarhizium robertsii is crucial for heat and UV resistance, and enhances fungal virulence against insects. Its absence impairs appressorium formation and reduces insecticidal activity.
Area of Science:
- Mycology
- Molecular Biology
- Biochemistry
Background:
- Metarhizium robertsii is an important entomopathogenic fungus used in biological pest control.
- Understanding fungal virulence factors is key to improving biocontrol strategies.
- Hypothetical proteins often represent uncharacterized virulence determinants.
Purpose of the Study:
- To characterize the function of the hypothetical protein MAA_07646 in Metarhizium robertsii.
- To investigate the role of MAA_07646 in fungal physiology and virulence.
- To elucidate the contribution of novel proteins to fungal pathogenicity.
Main Methods:
- RNA sequencing (RNA-seq) to identify upregulated genes during appressorium formation.
- Gene knockout (ΔMAA_07646) to assess protein function.
- Phenotypic analysis including growth, stress tolerance, and virulence assays in Galleria mellonella.
- Subcellular localization studies.
Main Results:
- MAA_07646 was significantly upregulated during appressorium formation.
- The protein localizes to both the nucleus and cytoplasm.
- Deletion mutants (ΔMAA_07646) showed increased sensitivity to heat and UV radiation.
- ΔMAA_07646 mutants exhibited reduced virulence in Galleria mellonella, linked to impaired appressorium formation and lower expression of virulence genes.
Conclusions:
- MAA_07646 is essential for thermotolerance and UV resistance in M. robertsii.
- The protein plays a significant role in fungal virulence by influencing appressorium development and virulence gene expression.
- MAA_07646 represents a novel virulence factor with potential for enhancing the insecticidal efficacy of M. robertsii.
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