Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/18554

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dc.contributor.authorTulha, Joana-
dc.contributor.authorLima, A.-
dc.contributor.authorLucas, Cândida-
dc.contributor.authorFerreira, Célia-
dc.date.accessioned2012-04-11T13:59:45Z-
dc.date.available2012-04-11T13:59:45Z-
dc.date.issued2010-
dc.identifier.issn1475-2859por
dc.identifier.urihttp://hdl.handle.net/1822/18554-
dc.description.abstractBackground: Freezing is an increasingly important means of preservation and storage of microbial strains used for many types of industrial applications including food processing. However, the yeast mechanisms of tolerance and sensitivity to freeze or near-freeze stress are still poorly understood. More knowledge on this regard would improve their biotechnological potential. Glycerol, in particular intracellular glycerol, has been assigned as a cryoprotectant, also important for cold/near-freeze stress adaptation. The S. cerevisiae glycerol active transporter Stl1p plays an important role on the fast accumulation of glycerol. This gene is expressed under gluconeogenic conditions, under osmotic shock and stress, as well as under high temperatures. Results: We found that cells grown on STL1 induction medium (YPGE) and subjected to cold/near-freeze stress, displayed an extremely high expression of this gene, also visible at glycerol/H+ symporter activity level. Under the same conditions, the strains harbouring this transporter accumulated more than 400 mM glycerol, whereas the glycerol/H+ symporter mutant presented less than 1 mM. Consistently, the strains able to accumulate glycerol survive 25-50% more than the stl1Δ mutant. Conclusions: In this work, we report the contribution of the glycerol/H+ symporter Stl1p for the accumulation and maintenance of glycerol intracellular levels, and consequently cell survival at cold/near-freeze and freeze temperatures. These findings have a high biotechnological impact, as they show that any S. cerevisiae strain already in use can become more resistant to cold/freeze-thaw stress just by simply adding glycerol to the broth. The combination of low temperatures with extracellular glycerol will induce the transporter Stl1p. This solution avoids the use of transgenic strains, in particular in food industry.por
dc.description.sponsorshipFundação para a Ciência e a Tecnologia (FCT)por
dc.language.isoengpor
dc.publisherBioMed Central (BMC)por
dc.rightsopenAccesspor
dc.subjectYeastpor
dc.subjectGlycerolpor
dc.subjectFreezingpor
dc.subjectGlycerol transporterpor
dc.titleSaccharomyces cerevisiae glycerol/H+ symporter Stl1p is essential for cold/near-freeze and freeze stress adaptation : a simple recipe with high biotechnological potential is givenpor
dc.typearticlepor
dc.peerreviewedyespor
dc.relation.publisherversionhttp://www.microbialcellfactories.compor
sdum.publicationstatuspublishedpor
oaire.citationStartPage82por
oaire.citationEndPage89por
oaire.citationTitleMicrobial Cell Factorypor
oaire.citationVolume9por
dc.identifier.doi10.1186/1475-2859-9-82por
dc.identifier.pmid21047428por
dc.subject.wosScience & Technologypor
sdum.journalMicrobial Cell Factorypor
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