Abstract
Three commercial cellulase preparations, Novozymes Cellic® Ctec2, Dupont Accellerase® 1500, and DSM Cytolase CL, were evaluated for their hydrolytic activity using a set of reference biomass substrates with controlled substrate characteristics. It was found that lignin remains a significant recalcitrance factor to all the preparations, although different enzyme preparations respond to the inhibitory effect of lignin differently. Also, different types of biomass lignin can inhibit cellulase enzymes in different manners. Enhancing enzyme activity toward biomass fiber swelling is an area significantly contributing to potential improvement in cellulase performance. While the degree of polymerization of cellulose in the reference substrates did not present a major recalcitrance factor to Novozymes Cellic® Ctec2, cellulose crystallite has been shown to have a significant lower reactivity toward all enzyme mixtures. The presence of polysaccharide monooxygenases (PMOs) in Novozymes Ctec2 appears to enhance enzyme activity toward decrystallization of cellulose. This study demonstrated that reference substrates with controlled chemical and physical characteristics of structural features can be applied as an effective and practical strategy to identify cellulosic enzyme activities toward specific biomass recalcitrance factor(s) and provide specific targets for enzyme improvement.
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Acknowledgments
Funding for this research was provided by the National Science Foundation (award number 1067012). The X-ray photoelectron spectroscopy and X-ray diffraction research was performed in EMSL, a national scientific user facility sponsored by the US Department of Energy's Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory in Richland, Washington. We also thank Novozymes North America, DSM, and Dupont for supplying the enzyme preparations.
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Ju, X., Bowden, M., Engelhard, M. et al. Investigating commercial cellulase performances toward specific biomass recalcitrance factors using reference substrates. Appl Microbiol Biotechnol 98, 4409–4420 (2014). https://doi.org/10.1007/s00253-013-5450-4
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DOI: https://doi.org/10.1007/s00253-013-5450-4