Journal Article

Expression of the red fluorescent protein DsRed-Express in filamentous ascomycete fungi

Lisbeth Mikkelsen, Sabrina Sarrocco, Mette Lübeck and Dan Funck Jensen

in FEMS Microbiology Letters

Volume 223, issue 1, pages 135-139
Published in print June 2003 |
Published online January 2006 | e-ISSN: 1574-6968 | DOI: http://dx.doi.org/10.1016/S0378-1097(03)00355-0

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Abstract

The recently reported red fluorescent protein DsRed from the reef coral Discosoma sp. represents a new marker that has been codon-optimized for high expression in mammalian cells. To facilitate expression of DsRed in ascomycete fungi, we used the clone pDsRed-Express (Clontech) for constructing a plasmid vector, pPgpd-DsRed, containing the constitutive Aspergillus nidulans glyceraldehyde 3-phosphate (gpd) promoter. This vector was used for co-transformation of Penicillium paxilli, Trichoderma harzianum and Trichoderma virens (syn. Gliocladium virens) together with either pAN7-1 or gGFP, both containing a gene for hygromycin resistance for transformant selection. In addition, gGFP contains a green fluorescent protein (GFP) gene for expression in Ascomycetes. Expression of DsRed-Express was obtained in all three fungi, indicating that DsRed can be used as a highly effective vital marker in Ascomycetes. Dual marked transformants expressed both DsRed-Express and GFP in the same mycelium and were used for non-quantitative comparison of the intensity of the fluorescence using confocal laser scanning microscopy.

Keywords: Trichoderma; Penicillium; Fungal transformation; Reporter gene; Fluorescent protein; Green fluorescent protein; DsRed

Journal Article.  2270 words.  Illustrated.

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