METODO DE OBTENCION DE 1-KESTOSA

La presente revela un método de obtención de 1-kestosa, a escala industrial, mediante el empleo de una fructosiltransferasa (FTF) recombinante, aislada de Festuca arundinacea, expresada constitutivamente en una levadura hospedera no sacarolítica. La FTF recombinante tipo sacarosa: sacarosa 1-fructos...

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Hauptverfasser:	ENRIQUE PEREZ CRUZ, DUNIESKY MARTINEZ GARCIA, RICARDO RAMIREZ IBAEZ, LUIS ENRIQUE TRUJILLO TOLEDO, GUMERSINDO FEIJOO COSTA, JUAN MANUEL LEMA RODICIO, ALINA SOBRINO LEGON, LAZARO HERNANDEZ GARCIA, CARMEN MENENDEZ RODRIGUEZ
Format:	Patent
Sprache:	spa
Schlagworte:	BEER BIOCHEMISTRY CHEMISTRY DERIVATIVES THEREOF ENZYMOLOGY FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIREDCHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERSFROM A RACEMIC MIXTURE FOODS OR FOODSTUFFS FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BYSUBCLASSES A23B - A23J HUMAN NECESSITIES METALLURGY MICROBIOLOGY MUTATION OR GENETIC ENGINEERING NUCLEIC ACIDS NUCLEOSIDES NUCLEOTIDES ORGANIC CHEMISTRY PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL SPIRITS SUGARS THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OFNUTRITIVE QUALITIES, PHYSICAL TREATMENT THEIR TREATMENT, NOT COVERED BY OTHER CLASSES VINEGAR WINE
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Zusammenfassung:	La presente revela un método de obtención de 1-kestosa, a escala industrial, mediante el empleo de una fructosiltransferasa (FTF) recombinante, aislada de Festuca arundinacea, expresada constitutivamente en una levadura hospedera no sacarolítica. La FTF recombinante tipo sacarosa: sacarosa 1-fructosiltransferasa (1-SSTrec) se produce de forma constitutiva, estable y en altos niveles, tanto en el sobrenadante como en el sedimento celular del cultivo de una cepa de Pichia pastoris. Por tanto, también se provee un método para la obtención de 1-SST a escala industrial. La enzima recombinante resultante se emplea para la producción enzimática masiva de fructoligosacáridos (FOS), específicamente de 1-kestosa, a partir de la sacarosa. El método permite conversiones superiores al 55% en FOS, donde la 1-kestosa está representada en más de un 90%. The present invention discloses an industrial scale method to obtain 1-kestose by the use of a recombinant fructosyltransferase (FTF), isolated from Festuca arundinacea, expressed constitutively in a non-saccharolytic yeast. In this invention, the recombinant FTF type sucrose:sucrose 1-fructosyltransferase (1-SSTrec) is produced constitutively, stable and at high yield, both in the culture supernatant and in intact cells of the host Pichia pastoris. Hence, the invention additionally provides a method for 1-SST production at industrial scale. The recombinant enzyme is then used for mass production of short-chain fructooligosaccharides (FOS), specifically 1-kestose, from sucrose. The method of the present invention establishes conditions that allow conversion rates where the synthesized FOS constitute above 55% (w/w) of the total sugars in the reaction mixture and the 1-kestose content reaches values higher than 90% (w/w) of the total FOS fraction.