Peroxide accumulation and cell death in filamentous fungi induced by contact with a contestant.
Podospora anserina and Coprinopsis cinerea (syn. Coprinus cinereus) are endowed with a defence system able to differentiate self vs. non-self and involving the generation of peroxide. Indeed, they produce peroxide when confronted with a filamentous fungus, only in non-self confrontations. Both species are not able to recognize yeasts and show a differential response to bacteria. The accumulation of peroxides in the ascomycete Podospora anserina requires an NADPH oxidase and a MAP kinase cascade, previously shown to be involved in fruit body formation, cell differentiation and cell degeneration. Confrontation is accompanied by the death of the contestant hyphae only in specific combinations of species. As in animals and plants, data suggest that peroxide is likely involved in signalling rather than playing a direct toxic role. Fungi display more complex behaviours than generally acknowledged, i.e. they are able to recognize potential contestants and built up defence reactions involving evolutionary conserved enzymes.
Silar
Philippe
P
Institut de Génétique et Microbiologie, UMR CNRS 8621, Université de Paris Sud, 91405 Orsay cedex, France. silar@igmors.u-psud.fr
D003302:Coprinus / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D020928:Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism; D019255:NADPH Oxidases / Q000235:genetics / Q000378:metabolism; D010545:Peroxides / Q000378:metabolism*; D048468:Podospora / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction
D005656:Fungal Proteins; D010545:Peroxides; D017382:Reactive Oxygen Species; D019255:NADPH Oxidases; D020928:Mitogen-Activated Protein Kinases