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THE PLANT CELL, Vol 8, Issue 6 985-999, Copyright © 1996 by American Society of Plant Biologists
MPG1 Encodes a Fungal Hydrophobin Involved in Surface Interactions during Infection-Related Development of Magnaporthe grisea
N. J. Talbot, M. J. Kershaw, G. E. Wakley, OMH. de Vries, JGH. Wessels and J. E. Hamer
Department of Biological Sciences, University of Exeter, Washington Singer Laboratories, Perry Road, Exeter EX4 4QG, United Kingdom
The rice blast fungus expresses a pathogenicity gene, MPG1, during
appressorium formation, disease symptom development, and conidiation. The
MPG1 gene sequence predicts a small protein belonging to a family of fungal
proteins designated hydrophobins. Using random ascospore analysis and
genetic complementation, we showed that MPG1 is necessary for
infection-related development of Magnaporthe grisea on rice leaves and for
full pathogenicity toward susceptible rice cultivars. The protein product
of MPG1 appears to interact with hydrophobic surfaces, where it may act as
a developmental sensor for appressorium formation. Ultrastructural studies
revealed that MPG1 directs formation of a rodlet layer on conidia composed
of interwoven ~5-nm rodlets, which contributes to their surface
hydrophobicity. Using combined genetic and biochemical approaches, we
identified a 15-kD secreted protein with characteristics that establish it
as a class I hydrophobin. The protein is able to form detergent-insoluble
high molecular mass complexes, is soluble in trifluoroacetic acid, and
exhibits mobility shifts after treatment with performic acid. The
production of this protein is directed by MPG1.
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