Abstract
According to our previous study, saprophytic fungi Botrytis cinerea contained 579 predicted secretary proteins. Among them, we found that 122 of these proteins contained the highly conserved pathogenic-related host-targeting-motif RxLx within 100 residues adjacent to the signal peptide cleavage site. According to PEDNAT and COG of the GenBank database, the functions of this motif containing proteins included metabolism modification and cell secretion. We blasted them in GenBank and found 47.54% had highly conserved homologues in other species, among them 74.1% had putative functional domains. This suggests these proteins are presumably ancient and vertically transmitted within the species. Many of these domains belonged to proteins which played roles in the pathogenic process of other kinds of pathogens and some had already been proved to be pathogenic secretary proteins of Botrytis cinerea. So we postulated that proteins contained host-targeting-motif RxLx were candidates participating in the pathogenesis of Botrytis cinerea.
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