Structural characterization of highly branched glucan sheath from Ceriporiopsis subvermispora

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• 作者：Daisuke Suzuki^a ; Hiroshi Nishimura^a ; Koichi Yoshioka^a ; ¹ ; Rumi Kaida^a ; ² ; Takahisa Hayashi^a ; ² ; Keiji Takabe^b ; Takashi Watanabe^a ; ^{twatanab@rish.kyoto-u.ac.jp}
• 关键词：Sheath ; Extracellular polysaccharide ; Isotope-enriched NMR
• 刊名：International Journal of Biological Macromolecules
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：95
• 期：Complete
• 页码：1210-1215
• 全文大小：1159 K
• 卷排序：95

文摘

Wood rotting basidiomycetes produce extracellular mucilaginous sheaths interfacing fungal hyphae and plant biomass. While the versatility of these fungal sheaths has been addressed, sheaths generated by selective white-rot fungi remain poorly understood. To fill this gap, the sheath produced by the basidiomycete Ceriporiopsis subvermispora, which degrades lignin while inflicting limited cellulose damage, was analyzed in this study. Fluorescence and transmission electron microscopy revealed that the sheath formed three days after inoculation into a beech wood slice on an agar plate and was embedded at the interface between fungal hyphae and wood cell walls. The sheath’s chemical structure was evaluated from fungus cultures in a liquid medium containing [U-13C6]-d-glucose and beech wood slices. Compositional analysis, methylation analysis, and 13C NMR demonstrated that the sheath mainly consisted of a comb-like β-1,6-glucopyranose residue-branched β-1,3-glucan, which is advantageous to retain water and extracellular secondary metabolites.