Characterization of FsXEG12A from the cellulose-degrading ectosymbiotic fungus Fusarium spp. strain EI cultured by the ambrosia beetle

AMB Express

Motoyuki Shimizu¹  Seitaro Tsutsumi¹  Hiromitsu Suzuki¹  Sho Tsuzuki¹  Masashi Kato¹  Yuto Kawai¹  Kiyota Sakai¹  Aya Yamaguchi¹  Sadanari Jindou²  Yoshihito Suzuki³  Hisashi Kajimura³ 

[1] Faculty of Agriculture, Meijo University;Faculty of Science and Technology, Meijo University;Graduate School of Bioagricultural Sciences, Nagoya University;

关键词: Fusarium dieback;    Ambrosia beetle;    Fusarium spp.;    Glycoside hydrolase family 12;    Enrichment culture;   

DOI  :  10.1186/s13568-020-01030-6

来源: DOAJ

【 摘 要 】

Abstract Despite the threat of Fusarium dieback posed due to ambrosia fungi cultured by ambrosia beetles such as Euwallacea spp., the wood-degradation mechanisms utilized by ambrosia fungi are not fully understood. In this study, we analyzed the 16S rRNA and 18S rRNA genes of the microbial community from the Ficus tree tunnel excavated by Euwallacea interjectus and isolated the cellulose-degrading fungus, Fusarium spp. strain EI, by enrichment culture with carboxymethyl cellulose as the sole carbon source. The cellulolytic enzyme secreted by the fungus was identified and expressed in Pichia pastoris, and its enzymatic properties were characterized. The cellulolytic enzyme, termed FsXEG12A, could hydrolyze carboxymethyl cellulose, microcrystalline cellulose, xyloglucan, lichenan, and glucomannan, indicating that the broad substrate specificity of FsXEG12A could be beneficial for degrading complex wood components such as cellulose, xyloglucan, and galactoglucomannan in angiosperms. Inhibition of FsXEG12A function is, thus, an effective target for Fusarium dieback caused by Euwallacea spp.

【 授权许可】

Unknown