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Efficient synthesis of two small eukaryotic polypeptides of human and plant origin was carried out using a novel expression/secretion yeast vector, pYET. The yield was optimized in respect of the yeast strain, expression cassette construction, promoter regulation and culture conditions. Both cloned genes code for biotechnologically important proteins: human epidermal growth factor and a serine proteinase...
Expression of the gene coding for the recombinant trypsin inhibitor, CPTI II, was enhanced tenfold when yeast transcription terminating sequences were added to the expression cassette of the pJK6 yeast vector. The yield was further increased about 20% in the BJ5464 yeast strain, defective in vacuolar proteases.
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