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microbiology, Vol 144, 2961-2969, Copyright © 1998 by Society for General Microbiology
ARTICLES |
SA Asgeirsdottir, OM de Vries and JG Wessels
Molecular Plant Biology Laboratory, Biomolecular Sciences and Biotechnology Institute, University of Groningen, Haren, The Netherlands. s.asgeirsdottir@biol.rug.nl
Three proteins with characteristic features of class I hydrophobins, designated POH1, POH2 and POH3, were isolated from the basidiomycete Pleurotus ostreatus. Based on N-terminal sequence analyses, their cDNAs were isolated using RT-PCR; the cDNAs and corresponding genes were sequenced and their regulation studied. POH1 is expressed in the fruiting bodies but not in vegetative mycelium. The regulation of POH2 and POH3 is tightly correlated. Both genes are switched off in the fruiting bodies but abundantly expressed in the vegetative mycelium of both monokaryon and dikaryon. POH2 and POH3 were isolated from the culture medium and from aerial hyphae. Co-purified POH2 and POH3 assembled in vitro into a protein membrane with a typical rodlet pattern as found previously with other hydrophobins. Similar structures were detected on the surface of aerial hyphae.
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