Abstract
The β-fructofuranosidase Xd-INV from the yeast Xanthophyllomyces dendrorhous is the largest microbial enzyme producing neo-fructooligosaccharides (neo-FOS) known to date. It mainly synthesizes neokestose and neonystose, oligosaccharides with potentially improved prebiotic properties. The Xd-INV gene comprises an open reading frame of 1995 bp, which encodes a 665-amino acid protein. Initial N-terminal sequencing of Xd-INV pointed to a majority extracellular protein of 595 amino acids lacking the first 70 residues (potential signal peptide). Functionality of the last 1785 bp of Xd-INV gene was previously proved in Saccharomyces cerevisiae but only weak β-fructofuranosidase activity was quantified. In this study, different strategies to improve this enzyme level in a heterologous system have been used. Curiously, best results were obtained by increasing the protein N-terminus sequence in 39 amino acids, protein of 634 residues. The higher β-fructofuranosidase activity detected in this study, about 15 U/mL, was obtained using Pichia pastoris and represents an improvement of about 1500 times the level previously obtained in a heterologous organism and doubles the best level of activity obtained by the natural producer. Heterologously expressed protein was purified and characterized biochemically and kinetically. Except by its glycosylation degree (10 % lower) and thermal stability (4–5 °C lower in the 60–85 °C range), the properties of the heterologous enzyme, including ability to produce neo-FOS, remained unchanged. Interestingly, besides the neo-FOS referred before blastose was also detected (8–22 g/L) in the reaction mixtures, making Xd-INV the first yeast enzyme producing this non-conventional disaccharide reported to date.
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Acknowledgments
Projects BIO2010-20508-C4-1/-4 and BIO2013-48779-C4-1/-4 from the Spanish Ministry of Economy and Competitiveness supported this research. We thank Fundación Ramón Areces for the institutional grant to the Centro de Biologia Molecular Severo Ochoa. M.G.P. was supported by a Spanish FPU fellowship from the Ministry of Education, Culture and Sports.
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Gimeno-Pérez, M., Linde, D., Fernández-Arrojo, L. et al. Heterologous overproduction of β-fructofuranosidase from yeast Xanthophyllomyces dendrorhous, an enzyme producing prebiotic sugars. Appl Microbiol Biotechnol 99, 3459–3467 (2015). https://doi.org/10.1007/s00253-014-6145-1
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DOI: https://doi.org/10.1007/s00253-014-6145-1