RESUMEN

D-Allose is a potential medical sugar because it has anticancer, antihypertensive, anti-inflammatory, antioxidative, and immunosuppressant activities. Allose production from fructose as a cheap substrate was performed by a one-pot reaction using Flavonifractor plautiiD-allulose 3-epimerase (FP-DAE) and Clostridium thermocellum ribose 5-phosphate isomerase (CT-RPI). The optimal reaction conditions for allose production were pH 7.5, 60°C, 0.1 g/l FP-DAE, 12 g/l CT-RPI, and 600 g/l fructose in the presence of 1 mM Co2+. Under these optimized conditions, FP-DAE and CT-RPI produced 79 g/l allose for 2 h, with a conversion yield of 13%. This is the first biotransformation of fructose to allose by a two-enzyme system. The production of allose by a one-pot reaction using FP-DAE and CT-RPI was 1.3-fold higher than that by a two-step reaction using the two enzymes.

Asunto(s)

Isomerasas Aldosa-Cetosa/metabolismo , Carbohidrato Epimerasas/metabolismo , Clostridiales/enzimología , Clostridium thermocellum/enzimología , Fructosa/metabolismo , Glucosa/metabolismo , Isomerasas Aldosa-Cetosa/genética , Proteínas Bacterianas/genética , Proteínas Bacterianas/metabolismo , Biotransformación , Carbohidrato Epimerasas/genética , Clostridiales/genética , Clostridium thermocellum/genética , Escherichia coli/genética , Regulación Bacteriana de la Expresión Génica , Concentración de Iones de Hidrógeno , Proteínas Recombinantes/aislamiento & purificación , Temperatura