title: Efficient saccharification of ammonia soaked rice straw by combination of Clostridium thermocellum cellulosome and Thermoanaerobacter brockii β-glucosidase.
abstract: Clostridium thermocellum is known to produce the cellulosomes with efficient plant cell wall degradation ability. To bring out the maximum cellulolytic ability of the cellulosomes, it is necessary to eliminate the end product inhibition by cellobiose. Combinations of β-glucosidases from thermophilic anaerobic bacteria and Aspergillusniger and C.thermocellum S14 cellulosomes were evaluated for optimization of cellulose degradation. β-Glucosidase (CglT) from Thermoanaerobacterbrockii, in combination with cellulosomes, exhibited remarkable saccharification ability for microcrystalline cellulose. When rice straw, soaked in 28% aqueous ammonia for 7 days at 60°C, was hydrolyzed by an enzyme loading combination of 2mg cellulosome and 10 units CglT per g glucan, 91% of glucan was hydrolyzed to glucose, indicating roughly1/10 the enzyme load of a Trichodermareesei cellulase (Celluclast 1.5L) and Novozyme-188 combination is enough for the combination of C.thermocellum S14 cellulosomes and CglT to achieve the same level of saccharification of rice straw.
authors.affiliation: Biological Resources and Post-harvest Division, Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Ohwashi, Tsukuba, Ibaraki 303-8686, Japan.
authors.forename: Rattiya
authors.initials: R
authors.lastname: Waeonukul
authors.forename: Akihiko
authors.initials: A
authors.lastname: Kosugi
authors.forename: Chakrit
authors.initials: C
authors.lastname: Tachaapaikoon
authors.forename: Patthra
authors.initials: P
authors.lastname: Pason
authors.forename: Khanok
authors.initials: K
authors.lastname: Ratanakhanokchai
authors.forename: Panida
authors.initials: P
authors.lastname: Prawitwong
authors.forename: Lan
authors.initials: L
authors.lastname: Deng
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Saito
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Mori
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D001483:Base Sequence; D050260:Carbohydrate Metabolism; D044603:Cellulosomes / Q000378:metabolism*; D048013:Acetivibrio thermocellus / Q000378:metabolism*; D017931:DNA Primers; D004795:Enzyme Stability; D000431:Ethanol / Q000378:metabolism; D005285:Fermentation; D006868:Hydrolysis; D012275:Oryza / Q000378:metabolism*; D046968:Thermoanaerobacter / Q000201:enzymology*; D001617:beta-Glucosidase / Q000378:metabolism*
chemical_list: D017931:DNA Primers; D000431:Ethanol; D000641:Ammonia; D001617:beta-Glucosidase