Functional analysis of a novel endo-β-1,6-glucanase MoGlu16 and its application in detecting cell wall β-1,6-glucan of Magnaporthe oryzae

文献类型： 外文期刊

第一作者： Wang, Yanxin

作者： Wang, Yanxin;Wang, Yanxin;Li, Zhoukun;Cui, Zhongli;Ye, Xianfeng;Li, Ding

作者机构：

关键词： beta-1,6-glucanase; Magnaporthe oryzae; specificity; beta-1,6-glucan; cell wall

期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：4.0； 五年影响因子：5.1 ）

ISSN：

年卷期： 2024 年 15 卷

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收录情况： SCI

摘要： As an essential component of the fungal cell wall, beta-1,6-glucan has an important role in the growth and development of fungi, but its distribution has not been investigated in Magnaporthe oryzae. Here, a novel beta-1,6-glucanase from M. oryzae, MoGlu16, was cloned and expressed in Pichia pastoris. The enzyme was highly active on pustulan, with a specific activity of 219.0 U/mg at pH 5.0 and 50 degrees C, and showed great selectivity for continuous beta-1,6-glycosidic bonding polysaccharides. Based on this, beta-1,6-glucan was selectively visualized in the vegetative hyphae, conidia and bud tubes of M. oryzae using a hydrolytically inactive GFP-tagged MoGlu16 with point mutations at the catalytic position (His-MoGlu16(E236A)-Gfp). The spore germination and appressorium formation were significantly inhibited after incubation of 105/ml conidia with 0.03 mu g/mu l MoGlu16. Mycelia treated with MoGlu16 produced reactive oxygen species and triggered the cell wall integrity pathway, increasing the expression levels of genes involved in cell wall polysaccharide synthesis. These results revealed that MoGlu16 participated in the remodeling of cell wall in M. oryzae, laying a foundation for the analysis of cell wall structure.

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