title: The addition of accessory enzymes enhances the hydrolytic performance of cellulase enzymes at high solid loadings.
abstract: The pretreatment process used and the nature of the biomass feedstock will influence the role that accessory enzymes can play in synergistically interacting with cellulases to effectively deconstruct the substrate. The work reported here assessed the possible boosting effects of the xylanase and lytic polysaccharide monooxygenase (AA9, formerly known as GH61) on the hydrolytic potential of cellulase enzyme mixtures during hydrolysis of steam pretreated poplar and corn stover at high (10-20% w/v) substrate concentrations. A higher proportion of xylanase was required when the substrate had a relatively high xylan content and at high substrate concentrations. In contrast, a relatively small amount of AA9 (about 2 mg/g cellulose) was enough, regardless of the nature or concentration of the substrate. The overall protein loading required to achieve effective hydrolysis of high concentrations of pretreated biomass substrates could be substantially reduced by optimizing the ratio of enzymes in the "cellulase" mixture.
authors: Forest Products Biotechnology and Bioenergy Group, University of British Columbia, Vancouver, BC, Canada.
authors: Jinguang
authors: J
authors: Hu
authors: Forest Products Biotechnology and Bioenergy Group, University of British Columbia, Vancouver, BC, Canada.
authors: Richard
authors: R
authors: Chandra
authors: Forest Products Biotechnology and Bioenergy Group, University of British Columbia, Vancouver, BC, Canada.
authors: Valdeir
authors: V
authors: Arantes
authors: Forest Products Biotechnology and Bioenergy Group, University of British Columbia, Vancouver, BC, Canada.
authors: Keith
authors: K
authors: Gourlay
authors: Forest Products Biotechnology and Bioenergy Group, University of British Columbia, Vancouver, BC, Canada.
authors: J
authors: J
authors: Susan van Dyk
authors: Forest Products Biotechnology and Bioenergy Group, University of British Columbia, Vancouver, BC, Canada. Electronic address: jack.saddler@ubc.ca.
authors: Jack N
authors: JN
authors: Saddler
mesh_terms: D018533:Biomass; D002480:Cellulase / Q000378:metabolism*; D006026:Glycoside Hydrolases / Q000378:metabolism; D006868:Hydrolysis; D011506:Proteins / Q000378:metabolism; D013227:Steam; D014990:Xylans / Q000378:metabolism; D003313:Zea mays / Q000378:metabolism
chemical_list: D011506:Proteins; D013227:Steam; D014990:Xylans; D006026:Glycoside Hydrolases; D002480:Cellulase
keywords: Accessory enzymes; Biofuel; Lignocellulosic biomass; Lytic polysaccharide monooxygenase (AA9); Xylanase