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Characterization and complementation of a Fus3/Kss1 type MAPK from Tuber borchii, TBMK
M Menotta1, R Pierleoni, A Amicucci
1Istituto di Chimica Biologica G. Fornaini, Università degli Studi di Urbino Carlo Bo, via Saffi 2, 61029, Urbino (PU), Italy. mmenotta@uniurb.it
Molecular Genetics and Genomics : MGG
|May 18, 2006
Summary
Researchers identified a novel mitogen-activated protein kinase (MAPK) in Tuber borchii (TBMK). This TBMK protein is involved in fungal signaling and plant interactions, crucial for ectomycorrhizal symbiosis.
Area of Science:
- Mycology
- Plant-Microbe Interactions
- Molecular Biology
Background:
- Mitogen-activated protein kinases (MAPKs) are essential signaling pathways in eukaryotes.
- MAPKs regulate crucial cellular processes like proliferation and differentiation in response to environmental cues.
- Understanding MAPK function in symbiotic fungi is key to elucidating plant-microbe interactions.
Purpose of the Study:
- To characterize the first MAPK from the ectomycorrhizal fungus Tuber borchii (TBMK).
- To investigate the role of TBMK in fungal signaling and its interaction with host plants.
Main Methods:
- Bioinformatic analysis to identify TBMK in the Tuber borchii genome.
- In vitro phosphorylation assays to confirm TBMK activity.
- Functional complementation studies in Saccharomyces cerevisiae and Fusarium oxysporum.
Main Results:
- TBMK was identified as a single-copy gene in Tuber borchii.
- The TBMK protein was phosphorylated during interaction with the host plant Tilia americana.
- TBMK restored pheromone signaling in yeast and partially restored invasive growth in a Fusarium mutant, indicating protein kinase activity and involvement in infection processes.
Conclusions:
- TBMK is a functional MAPK in Tuber borchii with kinase activity.
- TBMK likely plays a significant role in the pre-symbiotic phase of Tuber borchii, modulating genes essential for ectomycorrhizal symbiosis establishment.
