The filamentous fungi, owing to their ability to secrete high levels of proteins, are attractive organisms for the expression and secretion of heterologous proteins of commercial and medical value. We report the construction of three expression vectors for the production of heterologous proteins in Neurospora crassa and demonstrate their utility by expression of a bovine preprochymosin cDNA and secretion of processed, enzymatically active bovine chymosin.

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