Comparison of expression systems in the yeasts Saccharomyces cerevisiae, Hansenula polymorpha, Klyveromyces lactis, Schizosaccharomyces pombe and Yarrowia lipolytica. Cloning of two novel promoters from Yarrowia lipolytica

We have compared expression systems based on autonomously replicating vectors in the yeasts Saccharomyces cerevisiae, Schizosaccharomyces pombe, Kluyveromyces lactis, Hansenula polymorpha and Yarrowia lipolytica in order to identify a more suitable host organism for use in the expression cloning method (Dalbøge and Heldt‐Hansen, 1994) in which S. cerevisiae has traditionally been used. The capacity of the expression systems to secrete active forms of six fungal genes encoding the enzymes galactanase, lipase, polygalacturonase, xylanase and two cellulases was examined, as well as glycosylation pattern, plasmid stability and transformation frequency. All of the examined alternative hosts were able to secrete more active enzyme than S. cerevisiae but the relative expression capacity of the individual hosts varied significantly in a gene‐dependent manner. One of the most attractive of the alternative host organisms, Y. lipolytica, yielded an increase which ranged from 4·5 times to more than two orders of magnitude. As the initially employed Y. lipolytica XPR2 promoter is unfit in the context of expression cloning, two novel promoter sequences for highly expressed genes present in only one copy on the genome were isolated. Based on sequence homology, the genes were identified as TEF, encoding translation elongation factor‐1α and RPS7, encoding ribosomal protein S7. Using the heterologous cellulase II (celII) and xylanase I (xylI) as reporter genes, the effect of the new promoters was measured in qualitative and quantitative assays. Based on the present tests of the new promoters, Y. lipolytica appears as a highly attractive alternative to S. cerevisiae as a host organism for expression cloning. GenBank Accession Numbers: TEF gene promoter sequence: AF054508; RPS7 gene promoter sequence: AF054509. © 1998 John Wiley & Sons, Ltd.

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