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- Title
Molecular breeding of lignin-degrading brown-rot fungus Gloeophyllum trabeum by homologous expression of laccase gene.
- Authors
Arimoto, Misa; Yamagishi, Kenji; Wang, Jianqiao; Tanaka, Kanade; Miyoshi, Takanori; Kamei, Ichiro; Kondo, Ryuichiro; Mori, Toshio; Kawagishi, Hirokazu; Hirai, Hirofumi
- Abstract
The basidiomycete Gloeophyllum trabeum KU-41 can degrade Japanese cedar wood efficiently. To construct a strain better suited for biofuel production from Japanese cedar wood, we developed a gene transformation system for G. trabeum KU-41 using the hygromycin phosphotransferase-encoding gene ( hpt) as a marker. The endogenous laccase candidate gene ( Gtlcc3) was fused with the promoter of the G. trabeum glyceraldehyde-3-phosphate dehydrogenase-encoding gene and co-transformed with the hpt-bearing pAH marker plasmid. We obtained 44 co-transformants, and identified co-transformant L#61, which showed the highest laccase activity among all the transformants. Moreover, strain L#61 was able to degrade lignin in Japanese cedar wood-containing medium, in contrast to wild-type G. trabeum KU-41 and to a typical white-rot fungus Phanerochaete chrysosporium. By using strain L#61, direct ethanol production from Japanese cedar wood was improved compared to wild type. To our knowledge, this study is the first report of the molecular breeding of lignin-degrading brown-rot fungus and direct ethanol production from softwoods by co-transformation with laccase overproduction constructs.
- Publication
AMB Express, 2015, Vol 5, Issue 1, p1
- ISSN
2191-0855
- Publication type
Article
- DOI
10.1186/s13568-015-0173-9