Enhanced conversion of plant biomass into glucose using transgenic rice-produced endoglucanase for cellulosic ethanol |
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Authors: | Hesham Oraby Balan Venkatesh Bruce Dale Rashid Ahmad Callista Ransom James Oehmke Mariam Sticklen |
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Institution: | (1) Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824, USA;(2) Department of Chemical Engineering and Materials Sciences, Michigan State University, East Lansing, MI 48824, USA;(3) Department of Agricultural Economics, Michigan State University, East Lansing, MI 48824, USA |
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Abstract: | The catalytic domain of Acidothermus cellulolyticus thermostable endoglucanase gene (encoding for endo-1,4-β-glucanase enzyme or E1) was constitutively expressed in rice. Molecular
analyses of T1 plants confirmed presence and expression of the transgene. The amount of E1 enzyme accounted for up to 4.9%
of the plant total soluble proteins, and its accumulation had no apparent deleterious effects on plant growth and development.
Approximately 22 and 30% of the cellulose of the Ammonia Fiber Explosion (AFEX)-pretreated rice and maize biomass respectively
was converted into glucose using rice E1 heterologous enzyme. As rice is the major food crop of the world with minimal use
for its straw, our results suggest a successful strategy for producing biologically active hydrolysis enzymes in rice to help
generate alcohol fuel, by substituting the wasteful and polluting practice of rice straw burning with an environmentally friendly
technology. |
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Keywords: | Endoglucanase Acidothermus cellulolyticus Transgenic rice Ethanol fuel Rice straw burning |
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