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  • Title: Identification of the cis-acting elements involved in regulation of xylanase III gene expression in Trichoderma reesei PC-3-7.
    Author: Furukawa T, Shida Y, Kitagami N, Ota Y, Adachi M, Nakagawa S, Shimada R, Kato M, Kobayashi T, Okada H, Ogasawara W, Morikawa Y.
    Journal: Fungal Genet Biol; 2008 Jul; 45(7):1094-102. PubMed ID: 18450486.
    Abstract:
    The xylanase III gene (xyn3) from the filamentous fungus Trichoderma reesei PC-3-7 is only induced by cellulose, its derivatives and L-sorbose, but not by xylan. In this study, we defined three cis-acting elements within the xyn3 upstream region by using detailed deletion and mutation analysis. In addition to the Xyr1/ACEII-binding motif (5'-GGCTAA-3'), the analogous motifs 5'-GGCTAT-3' and 5'-GGCAAA-3' presented as an inverted repeat spaced by 16-bp internal sequences were identified as essential elements for xyn3 expression. Electrophoretic mobility shift assay using heterologously expressed Xyr1 demonstrates that all the identified cis-acting elements are able to interact with Xyr1. Furthermore, no xyn3 transcripts were formed in the xyr1-knockout strain upon induction by sophorose and L-sorbose. These results indicate that xyn3 expression is transcriptionally regulated by Xyr1, and suggest that the 5'-GGCTAT-3' and 5'-GGCAAA-3' motifs play roles in Xyr1-mediated cellulase and xylanase gene expression in T. reesei.
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