NDLI: Heterologous Protein Secretion Directed by a Repressible Acid Phosphatase System of Kluyveromyces lactis: Characterization of Upstream Region-Activating Sequences in the KIPHO5 Gene

Content Provider	PubMed Central
Author	Fermiñán, Encarnación Domínguez, Angel
Copyright Year	1998
Abstract	Transcription of the repressible acid phosphatase gene (KIPHO5) in Kluyveromyces lactis is strongly regulated in response to the level of inorganic phosphate (Pi) present in the growth medium. We have begun a study of the promoter region of this gene in order to identify sequences involved in the phosphate control of KIPHO5 expression and to design new expression-secretion systems in K. lactis. Deletion analysis and directed mutagenesis revealed two major identical upstream activating sequences (UAS) CACGTG at positions −430 (UAS1) and −192 (UAS2) relative to the ATG initiation codon. These sequences are identical to those described for Saccharomyces cerevisiae for the binding of Pho4p. Deletion or directed mutagenesis of either one or both UAS reduce KIPHO5 expression by the same amount (approximately 80%). When fused to the coding region of trout growth hormone cDNA (tGH-II), the promoter and signal peptide-encoding region of the phosphate-repressible KIPHO5 gene drives the expression of this gene and the secretion of the tGHII protein. Synthesis of tGHIIp in K. lactis transformants carrying this construct was found to be regulated by the Pi present in the medium; derepression of heterologous protein expression can therefore be achieved by lowering the Pi concentration.
Starting Page	2403
File Format	PDF
ISSN	10985336
e-ISSN	10985336
Journal	Applied and Environmental Microbiology
Issue Number	7
Volume Number	64
Language	English
Publisher	American Society for Microbiology
Publisher Date	1998-07-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Ecology Food Science Applied Microbiology and Biotechnology Biotechnology

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