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Expression of a fungal <Emphasis Type="Italic">laccase</Emphasis> fused with a bacterial cellulose-binding module improves the enzymatic saccharification efficiency of lignocellulose biomass in transgenic <Emphasis Type="Italic">Arabidopsis thaliana</Emphasis>
Authors:Ryota Iiyoshi  Taichi Oguchi  Toru Furukawa  Yosuke Iimura  Yukihiro Ito  Tomonori Sonoki
Institution:1.Graduate School of Agriculture and Life Science,Hirosaki University,Hirosaki,Japan;2.Tsukuba Plant Innovation Research Center (T-PIRC), Faculty of Life and Environmental Sciences,University of Tsukuba,Tsukuba,Japan;3.National Institute of Advanced Industrial Science and Technology,Tsukuba,Japan;4.Graduate School of Agricultural Science,Tohoku University,Sendai,Japan
Abstract:Delignification is effective for improving the saccharification efficiency of lignocellulosic biomass materials. We previously identified that the expression of a fungal laccase (Lac) fused with a bacterial cellulose-binding module domain (CBD) improved the enzymatic saccharification efficiency of rice plants. In this work, to evaluate the ability of the Lac-CBD fused chimeric enzyme to improve saccharification efficiency in a dicot plant, we introduced the chimeric gene into a dicot model plant, Arabidopsis thaliana. Transgenic plants expressing the Lac-CBD chimeric gene showed normal morphology and growth, and showed a significant increase of enzymatic saccharification efficiency compared to control plants. The transgenic plants with the largest improvement of enzymatic saccharification efficiency also showed an increase of crystalline cellulose in their cell wall fractions. These results indicated that expression of the Lac-CBD chimeric protein in dicotyledonous plants improved the enzymatic saccharification of plant biomass by increasing the crystallinity of cellulose in the cell wall.
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