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Identification of proteins that interact with two regulators of appressorium development, adenylate cyclase and cAMP-dependent protein kinase A, in the rice blast fungus Magnaporthe grisea

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Abstract

Adenylate cyclase (MAC1) and the catalytic subunit of cAMP-dependent protein kinase A (CPKA) are required for appressorium development and pathogenesis in the rice blast pathogen Magnaporthe grisea. To identify new components in the cAMP signal transduction pathway, we used the yeast two-hybrid system to screen MAC1 and CPKA against an appressorium cDNA library. The cDNA library was constructed by GATEWAY recombinational cloning, enabling transfer of the library to various alternative vectors. The protein phosphatase domain in MAC1, which is unique to fungal adenylate cyclases, interacted with a MAP kinase kinase and a Ser/Thr kinase. Interactions of MAC1 with the kinases may prove to be part of feedback loops between the corresponding signaling pathways. A predicted membrane protein, ACI1, which is highly expressed under conditions that are conducive to appressorium formation, also interacted with MAC1. ACI1 has an extracellular domain containing eight-cysteines, which is also present in other fungal proteins implicated in pathogenesis. The N-terminal half of CPKA, which includes a glutamine-rich sequence unique to a group of fungal sequences, interacted with a putative transcriptional regulator and two different glycosyl hydrolases. Phosphorylation motifs in these sequences suggest that they could be CPKA substrates. The protein interaction assay employed here can now be scaled up to identify interactions between a larger set of proteins in the M. grisea interactome.

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Acknowledgements

We thank Jun-Seop Jeong for an aliquot of the appressorium cDNA library and Albert Flavier for construction of the MAC1-1 clone. This work was supported by funds from North Carolina Agricultural Research Service and the National Science Foundation (0096210)

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  1. Fungal Genomics Laboratory, Center for Integrated Fungal Research, North Carolina State University, Campus Box 7251, Raleigh, NC 27695, USA

    R. D. Kulkarni & R. A. Dean

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  1. R. D. Kulkarni
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  2. R. A. Dean
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Correspondence to R. A. Dean.

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Communicated by E. Cerdá-Olmedo

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Kulkarni, R.D., Dean, R.A. Identification of proteins that interact with two regulators of appressorium development, adenylate cyclase and cAMP-dependent protein kinase A, in the rice blast fungus Magnaporthe grisea . Mol Genet Genomics 270, 497–508 (2004). https://doi.org/10.1007/s00438-003-0935-y

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