A novel fungal expression sys1em: Secretion of active calf chymosin from the filamentous fungus trichoderma reesei

A. Harkki; J. Uusitalo; M. Bailey; M. Penttila; J. K.C. Knowles

doi:10.1038/nbt0689-596

A novel fungal expression sys1em: Secretion of active calf chymosin from the filamentous fungus trichoderma reesei

A. Harkki, J. Uusitalo, M. Bailey, M. Penttila, J. K.C. Knowles

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Abstract

We have studied the expression of a bovine chymosin cDNA in Trichoderma ree- sei to test the ability of this novel fungal host vector system to express and secrete heterologous gene products. Four different expression plasmids were constructed to determine the optimum manner to fuse the chymosin cDNA to the promoter and the terminator of the major T. reesei cellu- lase gene, cellobiohydrolase I (cbhl). All four constructions, when transformed into Trichoderma, determined the secretion of a polypeptide corresponding in size to prochymosin and reacting with antichy- mosin antiserum. This polypeptide had a molecular weight indistinguishable from chymosin and showed milk clotting activity. In preliminary fermentation studies, one transformant secreted as much as 40 mg/1 of active chymosin.

Original language	English
Pages (from-to)	596-603
Number of pages	8
Journal	Bio/Technology
Volume	7
Issue number	6
DOIs	https://doi.org/10.1038/nbt0689-596
Publication status	Published - 1 Jan 1989
MoE publication type	A1 Journal article-refereed

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abstract = "We have studied the expression of a bovine chymosin cDNA in Trichoderma ree- sei to test the ability of this novel fungal host vector system to express and secrete heterologous gene products. Four different expression plasmids were constructed to determine the optimum manner to fuse the chymosin cDNA to the promoter and the terminator of the major T. reesei cellu- lase gene, cellobiohydrolase I (cbhl). All four constructions, when transformed into Trichoderma, determined the secretion of a polypeptide corresponding in size to prochymosin and reacting with antichy- mosin antiserum. This polypeptide had a molecular weight indistinguishable from chymosin and showed milk clotting activity. In preliminary fermentation studies, one transformant secreted as much as 40 mg/1 of active chymosin.",

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A novel fungal expression sys1em: Secretion of active calf chymosin from the filamentous fungus trichoderma reesei

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