Microbiologia
URI permanente desta comunidadehttps://locus.ufv.br/handle/123456789/11840
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Resultados da Pesquisa
Item Optimizing and validating the production of ethanol from cheese whey permeate by Kluyveromyces marxianus UFV-3(Biocatalysis and Agricultural Biotechnology, 2014-04) Diniz, Raphael H. S.; Rodrigues, Marina Q. R. B.; Fietto, Luciano G.; Passos, Flávia M. L.; Silveira, Wendel B.The purpose of this study was to optimize the production of ethanol from cheese whey permeate using Kluyveromyces marxianus UFV-3. We used the response surface methodology (RSM) with a central composite rotational design (CCRD) to evaluate the effects of pH (4.5–6.5), temperature (30–45 °C), lactose concentration (50–250 g l^−1), and cell biomass concentration (A600 2–4). We performed 29 fermentations under hypoxia in cheese whey permeate and seven fermentations for the validation of the equation obtained via RSM. Temperature was the most significant factor in optimizing ethanol production, followed by pH, cell biomass concentration and lactose concentration. The conditions for producing ethanol at yields above 90% were as follows: temperature between 33.3 and 38.5 °C, pH between 4.7 and 5.7, cell biomass concentration between A600 2.4 and 3.3, and lactose concentration between 50 and 108 g l^−1. The equation generated from the optimization process was validated and exhibited excellent bias and accuracy values for the future use of this model in scaling up the fermentation process.Item Cloning and expression of a functional core streptavidin in Pichia pastoris: Strategies to increase yield(Biotechnology Progress, 2012-08-22) Silveira, Wendel B. da; Diniz, Raphael H. S.; Passos, Flavia M. L.; Casteluber, Marisa C. F.; Damasceno, Leonardo M.; Passos, Frederico J. V.Streptavidin is widely used as an analytical tool and affinity tag together with biotinylated surfaces or molecules. We report for the first time a simple strategy that yields high biomass of a Pichia pastoris strain containing a methanol induced core streptavidin (cStp) gene. Three factors were evaluated for biomass production: glycerol concentration, aeration, and feed flow rates in a bioreactor. Recycling of recombinant cells, either free or immobilized, was investigated during induction. Concentration of 2.0 M glycerol, feeding flow rate of 0.11 mL min−1, and aeration by air injection dispersed with a porous stone combined with agitation at 500 rpm were the set of conditions resulting into maximum biomass yield (150 g L−1). These parameters yielded 4.0 g L−1 of cStp, after 96 h of induction. Recombinant biomass was recycled twice before being discarded, which can reduce production costs and simplify the process. Immobilized P. pastoris biomass produced 2.94 and 1.70 g L−1 of cStp in the first and second induction cycle, respectively. Immobilization and recycling of recombinant P. pastoris biomass opens new possibilities as a potential strategy to improve volumetric productivity for heterologous protein expression.Item Genomic sequence of the yeast Kluyveromyces marxianus CCT 7735 (UFV-3), a highly lactose-fermenting yeast isolated from the Brazilian dairy industry(Genome Announcements, 2014-11-06) Silveira, Wendel B.; Diniz, Raphael H. S.; Cerdán, M. Esperanza; González-Siso, María I.; Souza, Robson de A; Vidigal, Pedro M. P.; Brustolini, Otávio J. B.; Prata, Emille R. B. de Almeida; Medeiros, Alexsandra C.; Paiva, Lílian C.; Nascimento, Moysés; Ferreira, Éder G.; Santos, Valdilene C. dos; Bragança, Caio R. S.; Fernandes, Tatiana A. R.; Colombo, Lívia T.; Passos, Flávia M. L.Here, we present the draft genome sequence of Kluyveromyces marxianus CCT 7735 (UFV-3), including the eight chromosomes and the mitochondrial genomic sequences.