Cloning and characterization of an endo-b-1,3(4) glucanase and an aspartic protease from Phaffia rhodozyma CBS 6938

Ingrid Villadsen, M_L Bang, T. Sandal

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Abstract

We describe the identification and expression cloning of two novel enzymes, a P-glucanase and an aspartic protease, secreted from the basidiomycetous yeast Phaffia rhodozyma. A cDNA library from P. rhodozyma CBS 6938 was constructed, and full-length cDNA encoding an endo-1,3(4)-beta-glucanase (bg1) and an aspartic protease (pr1) were cloned by expression cloning in Saccharomyces cerevisiae W3124. The bgl cDNA encodes a 424-residue precursor protein with a putative signal peptide. The prl cDNA encodes a 405-residue prepropolypeptide with an 81-residue leader peptide. The aspartic protease was purified and characterized. It has a molecular mass of 36 kDa, an isoelectric point of pH 7.5, a pH activity optimum at 4.0-6.0, and a temperature activity optimum around 40 degrees C. Both enzymes show only low sequence identity to other known enzymes.
Original languageEnglish
JournalApplied Microbiology and Biotechnology
Volume51
Issue number2
Pages (from-to)215-222
ISSN0175-7598
Publication statusPublished - 1999

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