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Aufmerksamkeitsdefizit-/Hyperaktivitätsstörung (ADHS) im Erwachsenenalter: Stressreagibilität und Stressbewältigung unter Laborbedingungen und im Alltag / Attention-deficit/hyperacitvity disorder (ADHD) in adulthood: Stressreagibility and stress-related coping under laboratory conditions and in everyday lifeLackschewitz, Halina 29 October 2008 (has links)
No description available.
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A knowledgebase of stress reponsive gene regulatory elements in arabidopsis ThalianaAdam, Muhammed Saleem January 2011 (has links)
<p>Stress responsive genes play a key role in shaping the manner in which plants process and respond to environmental stress. Their gene products are linked to DNA transcription and its consequent translation into a response product. However, whilst these genes play a significant role in manufacturing responses to stressful stimuli, transcription factors coordinate access to these genes, specifically by accessing a gene&rsquo / s promoter region which houses transcription factor binding sites. Here transcriptional elements play a key role in mediating responses to environmental stress where each transcription factor binding site may constitute a potential response to a stress signal. Arabidopsis thaliana, a model organism, can be used to identify the mechanism of how transcription factors shape a plant&rsquo / s survival in a stressful environment. Whilst there are numerous plant stress research groups, globally there is a shortage of publicly available stress responsive gene databases. In addition a number of previous databases such as the Generation Challenge Programme&rsquo / s comparative plant stressresponsive gene catalogue, Stresslink and DRASTIC have become defunct whilst others have stagnated. There is currently a single Arabidopsis thaliana stress response database called STIFDB which was launched in 2008 and only covers abiotic stresses as handled by major abiotic stress responsive transcription factor families. Its data was sourced from microarray expression databases, contains numerous omissions as well as numerous erroneous entries and has not been updated since its inception.The Dragon Arabidopsis Stress Transcription Factor database (DASTF) was developed in response to the current lack of stress response gene resources. A total of 2333 entries were downloaded from SWISSPROT, manually curated and imported into DASTF. The entries represent 424 transcription factor families. Each entry has a corresponding SWISSPROT, ENTREZ GENBANK and TAIR accession number. The 5&rsquo / untranslated regions (UTR) of 417 families were scanned against TRANSFAC&rsquo / s binding site catalogue to identify binding sites. The relational database consists of two tables, namely a transcription factor table and a transcription factor family table called DASTF_TF and TF_Family respectively. Using a two-tier client-server architecture, a webserver was built with PHP, APACHE and MYSQL and the data was loaded into these tables with a PYTHON script. The DASTF database contains 60 entries which correspond to biotic stress and 167 correspond to abiotic stress while 2106 respond to biotic and/or abiotic stress. Users can search the database using text, family, chromosome and stress type search options. Online tools have been integrated into the DASTF  / database, such as HMMER, CLUSTALW, BLAST and HYDROCALCULATOR. User&rsquo / s can upload sequences to identify which transcription factor family their sequences belong to by using HMMER. The website can be accessed at http://apps.sanbi.ac.za/dastf/ and two updates per year are envisaged.</p>
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Étude transcriptionnelle d'une souche pathogène aviaire de Escherichia coli (APEC) et son mutant Pst (phosphate specific transport)Crépin, Sébastien January 2008 (has links)
Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal
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RNA-Seq and proteomics based analysis of regulatory RNA features and gene expression in Bacillus licheniformisWiegand, Sandra 25 September 2013 (has links)
No description available.
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DNA Methylation, Cellular Stress Response and Expression of Inner Nuclear Membrane ProteinsLevesque, Steve 04 May 2011 (has links)
Hutchinson-Gilford Progeria Syndrome is described as a series of mutations within the lamin A gene leading to the accumulation of progerin in the nucleus, contributing to premature aging and affecting the epigenetic control. Epigenetic control, such as DNA methylation, relies on DNA methyltransferase enzymes. In human cells, heat shock (HS) leads to the formation of nuclear stress bodies (nSBs); ribonucleoprotein aggregates of Sat III RNA and RNA-binding proteins. The objectives of this study were to determine if epigenetic status induces varying responses to HS and assess the variability of nuclear proteins in similar conditions. Results show epigenetic modifications do not prevent a stress response; however the extent may be affected. In addition the functions of most nuclear antigens were not affected. It is most likely the sum of interactions at the inner nuclear membrane and nuclear lamina interface that result in nuclear strength pertaining to lamin A.
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Hormetic dietary phytochemicals from Western Canadian plants: Identification, characterization and mechanistic insights2013 June 1900 (has links)
Activation of mammalian stress responsive pathways by plant secondary metabolites may contribute to the protection against certain chronic diseases afforded by fruit and vegetable consumption. This work focuses on the identification of plant compounds that activate the stress-responsive enzyme quinone reductase (QR) by stabilizing the transcription factor NF-E2 related factor-2 (Nrf2). Screening methanolic extracts of plants from Western Canada for QR induction in a mouse hepatoma cell line (Hepa-1c1c7) led to the identification of twenty-one extracts capable of doubling the activity of QR. Bioassay-guided fractionation of six extracts led to the identification of novel classes of compounds with QR-inducing activity including fatty-acid derived polyacetylenes, phthalides, and cannabinoids. Studies using low molecular weight thiols and the recombinantly expressed protein Keap1, the principal negative regulator of Nrf2, supported a mechanism of QR activation involving covalent modification of Keap1 cysteines for the polyacetylenes and phthalides. Analysis of transcriptional changes in response to treatment with a panel of QR-inducing compounds provided strong support for Nrf2 activation by the polyacetylene (3S,8S)-falcarindiol and the isothiocyanate (R)-sulforaphane and weaker support for the compounds (3R,8S)-falcarindiol, 6-isovaleryl-umbelliferone (6-IVU) and (Z)-ligustilide. Additionally, transcript level analyses supported a role for the aryl-hydrocarbon receptor in QR-activation by (3R,8S)-falcarindiol, (Z)-ligustilide, (R)-sulforaphane, 6-IVU and cannabidiol and suggested that treatment with polyacetylenes with a (3R)-configuration, (Z)-ligustilide and 6-IVU causes substantial changes in the expression of genes associated with lipid homeostasis and energy metabolism. As a whole, this work provides evidence that compounds that activate QR (and Nrf2) are widely distributed in the Canadian flora. However, of these QR activators, few are active at concentrations that are expected to be achieved through dietary consumption. Nevertheless, the most exceptional compounds isolated in this work, the compounds (3S,8S)-falcarindiol and epoxyfalcarindiol are highly potent and appear to be or are expected to be specific for activating Nrf2 and thus warrant attention with respect to dietary implications and as drug candidate leads.
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Portage animal des Escherichia coli entérohémorragiques : colonisation et interaction avec le microbiote digestif animal / Animal carriage of enterohaemorrhagic Escherichia coli : colonization and interaction with the animal digestive microbiotaSegura, Audrey 09 March 2018 (has links)
Les Escherichia coli entérohémorragiques (EHEC) sont des E. coli producteurs de Shiga-toxines (STEC) représentant le quatrième agent responsable de toxi-infections alimentaires en Europe. La contamination par ces pathogènes résulte principalement de l’ingestion de produits alimentaires contaminés par les fèces de bovins, dont le tube digestif apparait comme le principal réservoir naturel des EHEC. Ces pathogènes survivent dans le tractus digestif du ruminant, qui est porteur sain, et semblent bien adaptés à l’ensemble de cet écosystème complexe. Réduire le portage animal est une stratégie de choix afin de limiter les toxi-infections humaines à EHEC. L’objectif de cette thèse était d’approfondir les connaissances sur la physiologie et l’écologie des EHEC dans le tube digestif du bovin, une étape primordiale pour proposer, à terme, différentes stratégies visant à limiter le portage. L’analyse du transcriptome de la souche EHEC O157:H7 de référence EDL933 a permis l’identification de voies métaboliques utilisées par les EHEC dans différents compartiments du tube digestif de l’animal. Certains sucres, dont ceux issus de la couche de mucus intestinal, et acides aminés ainsi que l’éthanolamine semblent représenter des substrats importants pour la survie des EHEC tout au long du tube digestif du bovin. Cette étude transcriptomique a également mis en évidence l’activation, par la souche EHEC, de nombreux systèmes de résistance à différents stress rencontrés dans le tube digestif bovin, dont les systèmes toxines/anti-toxines. L’activation de ces systèmes et la capacité à former des biofilms ont également été observées chez une souche STEC O157:H7 d’origine bovine, la souche MC2, dans des conditions mimant une persistance dans l’environnement. La caractérisation génomique et phénotypique permet de considérer cette souche comme pathogène et des études réalisées in vitro et in vivo ont indiqué que la souche MC2 était capable de persister dans le tube digestif du bovin mais aussi dans l’environnement de l’élevage. L’inoculation expérimentale de bovins par la souche MC2 a permis de mettre au point le premier modèle animal reproductible de portage et d’excrétion des STEC O157:H7 décrit en France. Ce modèle pourra être utilisé pour tester in vivo l’effet d’additifs alimentaires, tels que les probiotiques, afin de réduire le portage et l’excrétion de souches EHEC par les bovins, et donc limiter la contamination de l’Homme. / Enterohaemorrhagic Escherichia coli (EHEC) are Shiga-toxin producing E. coli (STEC) which represent the fourth pathogen leading to foodborne illness in Europe. Contamination by these pathogens results mainly from the ingestion of food contaminated by feces of bovine, for which the digestive tract appears as the main natural reservoir of EHEC. These pathogens survive in the digestive tract of ruminants, which is healthy carriers, and seem well-adapted to this complex ecosystem. Reducing animal carriage is a strategy of choice to limit EHEC human infections. The aim of this thesis was to increase our knowledge on the physiology and ecology of EHEC in the digestive tract of bovine, a key step to propose, ultimately, different strategies to limit the carriage. Transcriptome analysis of the EHEC O157:H7 reference strain EDL933 allowed the identification of metabolic pathways used by EHEC in different compartments of the digestive tract of the animal. Some carbohydrates, including those from the intestinal mucus layer, and amino acids as well as ethanolamine appear to be important substrates for the survival of EHEC throughout the bovine digestive tract. This transcriptomic study also revealed the activation, by the EHEC strain, of several stress resistance systems encountered in the bovine digestive tract, including toxin/anti-toxin systems. The activation of these systems and the ability to form biofilms have also been observed in a bovine STEC O157:H7 strain, MC2 strain, under conditions mimicking persistence in the environment. Genomic and phenotypic characterization allows this strain to be considered as pathogenic and in vitro and in vivo studies indicated that the MC2 strain was able to persist in the bovine digestive tract but also in the farm environment. The experimental inoculation of bovines with the MC2 strain led to the development, for the first time in France, of a reproducible animal model of carriage and excretion of STEC O157:H7. This model could be used to test in vivo the effect of food additives, such as probiotics, in order to reduce the carriage and excretion of EHEC strains by bovines, and thus limit the contamination of humans.
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Efeitos da exposição à fração solúvel da gasolina em parâmetros bioquímicos e fisiológicos de Prochilodus lineatusSimonato, Juliana Delatim 19 May 2010 (has links)
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Previous issue date: 2010-05-19 / Universidade Federal de Sao Carlos / The aim of this work was to evaluate the effects of the water-soluble fraction of gasolina (WSFG) to the Neotropical fish Prochilodus lineatus. The WSFG was prepared by adding gasoline to water (1:4) this mixture was then exposed to intense sunlight for 6h, simulating a gasoline spill in tropical conditions. After that the upper insoluble phase was discharged and the WSFG was collected. Fish were exposed for 6, 24 and 96h to the WSFG diluted to 5% (EXP group) or only to water (control group or CTR). The following parameters were analyzed: biochemical (antioxidants and EROD) of gills and liver, hematologic, osmo-ionic, metabolic, endocrine (cortisol) besides the density and distribution of chloride cells (CC) and the activity of gills Na+/K+-ATPase (NKA). The increased in ethoxyresorufin-O-deethylase (EROD) and glutathione-S-transferase (GST) activity indicated phase I and II biotransformation of the compounds present in the WSFG in both organs. The activation of CYP1A in the gills pointed out the importance of this organ in the biotransformation of xenobiotics. The liver showed an increase in reduced glutathione (GSH) content at 24 and 96 h exposure to WSFG and the increase in the activity of catalase (CAT) and glutathione peroxidase (GPx) after 96 h exposure. The gills showed an activation of the antioxidant defenses with an increased CAT activity soon after 6h exposure and an increase in GSH content after 24h exposure. However, for both organs the antioxidants defense was not enough to prevent oxidative damage, as shown by the occurrence of lipid peroxidation in liver and gills after 6 and 96h of exposure, respectively. The WSFG also promoted hemolysis, as indicated by the changes in the hematological parameters analyzed and an increase in plasma K+. Fish showed a secondary stress response, noted by the occurrence of hyperglycemia in all the periods of exposure, despite no significant increase in plasma cortisol. The WSFG also lead to an increase in the density of CC, in the activity of NKA, in plasma concentrations of Na+ and in the osmolarity in fish exposed to WSFG for 24h. Taken together these results showed that the compounds present in the WSFG interfere on the functioning of vital organs such as liver and gills of Prochilodus lineatus. / O objetivo deste trabalho foi avaliar os possíveis efeitos da fração solúvel da gasolina (FSG) em alguns parâmetros bioquímicos e fisiológicos do peixe neotropical Prochilodus lineatus. A FSG foi preparada misturando-se gasolina em água (1:4), essa mistura foi exposta à radiação solar intensa durante 6 h, simulando um derrame de gasolina em condições tropicais. Após, a FSG foi coletada e a fração insolúvel foi descartada. Os animais foram expostos por 6, 24 e 96 h à FSG diluída 5 % (grupo EXP) ou apenas à água (grupo controle ou CTR). Foram analisados parâmetros bioquímicos (antioxidantes e indução da CYP1A) em brânquia e fígado, hematológicos, osmo-iônicos, metabólicos, endócrino (cortisol) além da densidade e distribuição de células-cloreto (CC) e a atividade da enzima Na+/K+-ATPase (NKA) nas brânquias. O aumento na atividade da etoxiresorufina-O-desetilase (EROD) e da glutationa-S-transferase (GST) indicou a estimulação das vias de biotransformação de fase I e II dos compostos da FSG em ambos os órgãos. A ativação das enzimas de detoxificação nas brânquias ressaltou a importância deste órgão na biotransformação de xenobióticos. O fígado apresentou aumento na concentração de glutationa reduzida (GSH) após 24 h e 96 h de exposição à FSG e aumento na atividade catalase (CAT) e glutationa peroxidase (GPx) após 96 h de exposição. As brânquias mostraram uma ativação das vias antioxidantes com o aumento da CAT logo após 6 h de exposição, e da concentração de GSH após 24 h de exposição. No entanto, para ambos os órgãos estudados, a ativação das defesas antioxidantes não foi suficiente para impedir os danos oxidativo, como indicado pela ocorrência de peroxidação lipídica (LPO) no fígado e nas brânquias após 6 e 96 h de exposição, respectivamente. A FSG também provocou hemólise comprovada pela diminuição dos parâmetros hematológicos analisados, seguido pelo aumento do K+ plasmático. Os peixes mostraram uma resposta secundária de estresse visualizado pela ocorrência da hiperglicemia em todos os períodos de exposição, apesar da ausência de diferenças significativas na concentração plasmática do cortisol. A FSG também provocou aumento na densidade das CC, na atividade da NKA, nas concentrações plasmáticas do Na+ e osmolaridade nos animais expostos durante 24 h. Esses resultados em conjunto indicam que os compostos presentes na FSG afetaram de maneira significativa órgãos vitais como o fígado e as brânquias do Prochilodus lineatus.
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Análise do perfil de expressão de serina/treonina fosfatases e prospecção da função biológica para algumas dessas enzimas em Dictyostelium discoideum / Analysis of serine/threonine phosphatases expression profile and biological function prospection for some of these enzymes in Dictyostelium discoideumLayla Farage Martins 13 December 2010 (has links)
A fosforilação reversível de proteínas em resíduos de serina e treonina, catalisada por quinases e fosfatases desempenha papel chave na regulação do crescimento e na diferenciação celular em eucariotos. As serina/treonina proteínas fosfatases (PSTPs) são atualmente divididas em três famílias denominadas PPP (PhosphoProtein Phosphatase), PPM (Phosphoprotein Phosphatase Magnesium-dependent) e FCP/SCP (RNA polymerase II CTD phosphatase), sendo que os membros da família PPP são, frequentemente, holoenzimas compostas de uma subunidade catalítica associada a uma ou mais subunidades reguladoras, as quais definem a função, localização e especificidade ao substrato da fosfatase. Neste trabalho, analisamos, através de RT-qPCR, o perfil de expressão dos genes codificadores de subunidades catalíticas de PPPs de Dictyostelium discoideum (PP1c, PP2Ac, PP4c, PP4c-like, PP6c e PP5c) e de 16 potenciais parceiros moleculares de algumas destas subunidades catalíticas, tais como DdI-2 e DdI-3, sabidamente inibidores da PP1c. Em resposta ao estresse térmico de células da fase de crescimento, detectamos o aumento dos níveis de transcritos de PP4c e PP6c e também de DdI-2, DdI-3 e DDB_G0292194, esta última, uma proteína de função desconhecida que interage com a PP1c em ensaios de duplo-híbrido em leveduras. Por outro lado, durante o estresse hiper-osmótico observamos a diminuição dos níveis de transcritos de quase todos os genes analisados com exceção de DdI-2 e DDB_G0292194. O nível de expressão de DdPP1c, DdI-2, DdI-3 e DDB_G0292194 também foi analisado em resposta ao estresse oxidativo e apenas o DDB_G0292194 foi induzido nesta condição. Os genes de PP1c, PP4, PP5c e PP6c são expressos durante todo o ciclo de vida de D. discoideum, mas a expressão de alguns dos genes analisados aumenta em uma fase definida do ciclo de desenvolvimento como é o caso de DDB_G0292194 que tem níveis de transcritos aumentados na fase de agregação. Este gene codifica uma proteína hipotética de 559 aminoácidos, que apresenta um domínio FHA (ForkHead-Associated) em sua região aminoterminal, além de uma sequência similar ao motivo consenso de ligação à PP1c. Ensaios no sistema de duplo-híbrido em leveduras confirmaram que a interação entre DDB_G0292194 e DdPP1c independe do domínio FHA. Verificamos, também, que o mutante nocaute de DDB_G0292194 apresenta uma morfologia alterada em condições padrões de cultivo, tanto na fase de crescimento como durante o desenvolvimento, além de uma maior sensibilidade ao estresse oxidativo causado pelo peróxido de hidrogênio quando comparado à linhagem selvagem. Em conjunto, nossos resultados evidenciam a importância das PPPs na resposta a diferentes tipos de estresse e para o crescimento e desenvolvimento de D. discoideum. / Reversible phosphorylation of proteins on serine and threonine residues, catalyzed by kinases and phosphatases plays a key role in growth and cell differentiation regulation in eukaryotes. Protein serine/threonine phosphatases (PSTPs) are currently divided into three families named PPP (Phosphoprotein Phosphatase), PPM (Phosphoprotein Phosphatase Magnesium-dependent) and FCP/SCP (RNA polymerase II CTD phosphatase). The PPP family members are often holoenzymes composed of a catalytic subunit associated with one or more regulatory subunits, which define function, localization and substrate specificity of the phosphatase. In this work, we have examined, by RT-qPCR, the expression profile of genes encoding PPP catalytic subunits of Dictyostelium discoideum (PP1c, PP2Ac, PP4c, PP4c-like, PP6c and PP5c) and 16 potential molecular partners for some of these catalytic subunits, such as DdI-2 and DdI-3, both known as PP1c inhibitors. In response to heat stress of growth phase cells, we detected increased levels of transcripts of PP4c and PP6c as well as of DdI-2, DdI-3, and DDB_G0292194, the latter a protein of unknown function that interacts with PP1c in yeast two-hybrid assays. Moreover, during the hyperosmotic stress we observed decreased transcript levels of nearly all genes examined except DdI-2 and DDB_G0292194. The expression level of DdPP1c, DdI-2, DdI-3 and DDB_G0292194 was also analyzed in response to oxidative stress and only DDB_G0292194 was induced in this condition. PP1c, PP4c, PP5c and PP6c genes are expressed throughout growth and development of D. discoideum while transcript levels of some the analysed genes were increased at a defined stage of the developmental cycle as in the case of DDB_G0292194, which increased during aggregation. This gene encodes a hypothetical protein of 559 amino acids bearing a FHA (ForkHead-Associated) domain in its aminoterminal region and a sequence matching the PP1c binding consensus motif. Yeast two-hybrid assays confirmed that DDB_G0292194 and DdPP1c interaction does not depend on FHA domain. We also found that DDB_G0292194 knockout mutant exibits an altered morphology on standard growth and developmental conditions and shows an increased sensitivity to oxidative stress induced by hydrogen peroxide in comparison to the wild type strain. Taken together, our results highlight the importance of PPPs in the response to different types of stress and for growth and development of D. discoideum.
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Etude des mécanismes moléculaires de la réponse au stress chez Oenococcus oeni et mise en oeuvre d'outils pour l'exploration fonctionnelle de gènes d'intérêt oenologique / Study of molecular mechanisms of stress response in Oenococcus oeni and implementation of tools for the functional exploration of enological genesDarsonval, Maud 09 December 2015 (has links)
O. oeni est responsable de la fermentation malolactique des vins. Elle doit en permanence s’adapter aux fluctuations physico-chimiques de son environnement. La production de protéines Hsp constitue un mécanisme majeur d’adaptation de la bactérie à son environnement. Chez O. oeni, la protéine CtsR est l’unique régulateur identifié à ce jour des gènes hsp. Ce manuscrit aborde la caractérisation des mécanismes de régulation de la réponse au stress chez O. oeni. Une partie de ce travail a consisté à développer un nouvel outil d’expression de gènes chez O. oeni. Cet outil a permis l’étude de la fonction in vivo du gène hsp18 par une technique de modulation de l’expression de gènes par synthèse d’ARN antisens (ARNas). La production d’ARNas ciblant l’ARN messager du gène hsp18 entraîne une diminution du taux protéique de Lo18 et induit une perte de cultivabilité en conditions de stress. Ces résultats montrent, pour la 1ère fois in vivo, l’implication de Lo18 dans la thermotolérance et l’acidotolérance de O. oeni. Cette même approche appliquée au gène ctsR a induit une perte de cultivabilité en conditions de stress confirmant le rôle clef du locus ctsR dans la réponse au stress de O. oeni. Les mécanismes de régulation de l’activité de CtsR ont été appréhendés par complémentation d’un mutant ctsR déficient de B. subtilis via l’expression de ctsR de O. oeni. Des tests de thermoinduction mettent en évidence la thermosensibilité du CtsR de O. oeni dont l’activité est levée à une température inférieure à 33°C. Le pSIPSYN est un outil prometteur valorisé au cours de ce travail par une étude évaluant l’impact de deux estérases de O. oeni, EstA2 et EstA7 sur le profil aromatique du vin. / O. oeni is responsible for wine malolactic fermentation. As any organism, O. oeni tries to adapt its physiology to environmental fluctuations by producing Hsp proteins encoded by the hsp genes. In O. oeni, CtsR is currently the only regulator of hsp genes. As an alternative to the lack of genetic tool, with the goal of understanding the mechanisms of O. oeni stress response, we developed a new expression vector, the pSIPSYN, to produce antisense RNA targeting of hsp18 mRNA. The synthesis of hsp18 asRNA leads to the decrease in the protein level of Lo18 and induced a loss of cultivability after heat or acid shock showing for the first time in vivo involvement of Lo18 in thermotolerance and acidotolerance in O. oeni. The O. oeni ability of the membrane fluidity restoration of after ethanol stress was strongly affected in the presence of asRNAof hsp18 gene. Then, the ctsR function in O. oeni was investigated with this new genetic tool. Inhibition of the ctsR expression by asRNA approach induced a loss of cultivability after heat or acid shock confirming the key role of ctsR locus in the O. oeni stress response. B. subtilis was used to characterize the regulation of CtsR activity. The ctsR gene of O. oeni was expressed to complement a B. subtilis ctsR-deficient strain and restore the wild-type phenotype. Thermoinduction tests performed to understand the thermosensibility of CtsR showed that O. oeni CtsR is a specific thermosensor inactivated at a temperature threshold below 33°C. The pSIPSYN is a promising tool valorized in this work through an oenological study by evaluating of the impact of O. oeni two esterases, and EstA2 EstA7 on wine ester profile.
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