title: Selection of new over-producing derivatives for the improvement of extracellular lipase production by the non-conventional yeast Yarrowia lipolytica.
abstract: The non-conventional yeast Yarrowia lipolytica produces an extracellular lipase encoded by the LIP2 gene. Mutant strains with enhanced productivity were previously obtained either by chemical mutagenesis or genetic engineering. In this work, we used one of these mutants, named LgX64.81 to select new overproducing strains following by amplification of the LIP2 gene. We also developed a process for lipase production in bioreactors and compared lipase production levels in batch and fed-batch cultures. Batch culture led to a lipase production of 26450 U ml(-1) in a media containing olive oil and tryptone as carbon and nitrogen sources. Feeding of a combination of tryptone and olive oil at the end of the exponential growth phase yielded to lipase activity of 158246 U ml(-1) after 80 h of cultivation. In addition this production system developed for the extracellular lipase could also be applied for other heterologous protein production since we have demonstrated that LgX64.81 is an interesting alternative host strain.
authors.affiliation: Centre Wallon de Biologie Industrielle, Service de Technologie Microbienne, Université de Liège, Bd du Rectorat Bat. B40 B-4000 Liège, Belgium. p.thonart@ulg.ac.be
authors.forename: Patrick
authors.initials: P
authors.lastname: Fickers
authors.forename: Franck
authors.initials: F
authors.lastname: Fudalej
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Nicaud
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Destain
authors.forename: Phillipe
authors.initials: P
authors.lastname: Thonart
mesh_terms: D019149:Bioreactors / Q000382:microbiology; D001709:Biotechnology / Q000379:methods; D003470:Culture Media / Q000737:chemistry; D004274:DNA, Recombinant; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D005818:Genetic Engineering; D005822:Genetic Vectors; D007218:Industrial Microbiology / Q000379:methods; D008049:Lipase / Q000096:biosynthesis* / Q000235:genetics; D011995:Recombination, Genetic; D013997:Time Factors; D025062:Yarrowia / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development
chemical_list: D003470:Culture Media; D004274:DNA, Recombinant; D008049:Lipase