Yeast β-1,3-glucan production by an outer membrane β-1,6-glucanase: process optimization, structural characterization and immunomodulatory activity.

Yan Qiao, Xianfeng Ye, Lingli Zhong, Chengyao Xia, Lei Zhang, Fan Yang, Yongkai Li, Xiaodong Fang, Lei Fu, Yan Huang, Hui Cao, Zhoukun Li, Zhongli Cui

Food & function 2022 Apr 04

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The β-glucan from Saccharomyces cerevisiae is a potent adjuvant that exhibits a broad spectrum of biological activities and health benefits, and different processes have been established to prepare active β-glucan from yeast. However, studies concerning the effect of β-1,6-glucanase enzymolysis on the structure and immunomodulatory activity of yeast β-1,3-glucan are scarce. In this study, we aim to develop a novel enzymatic process for the preparation of immunologically active β-glucan (BYG) from baker's yeast using a β-1,6-glucanase GluM. The β-1,6-glucan in fungal cell wall was specifically hydrolyzed by GluM, and resulted in cell wall decomposition and β-glucan release. Batch production of BYG was realized with 17.8% yield, 85.3% purity and 75.4% recovery rate. Structural characterization indicated that BYG exhibits rod-like structures with natural triplex and nanoparticle-like substructures compared with the commercial Glucan 300. BYG ameliorated inflammation in a DSS-induced mouse model of colitis through inhibiting oxidative stress (NO, MDA and MPO), inflammatory mediators (NLRP3, ASC, caspase-1, iNOS and COX-2), and pro-inflammatory cytokines (IL-1β, IL-6, TNF-α, IFN-γ), increasing the expression levels of tight junction proteins (ZO-1, occludin and claudin-1) and modulating the production of gut microbiota-synthesized SCFAs compared to the control. Our results showed that yeast β-1,3-glucan prepared with β-1,6-glucanase exhibits structural integrity that is responsible for its favorable immunomodulatory activity.

Citation

Yan Qiao, Xianfeng Ye, Lingli Zhong, Chengyao Xia, Lei Zhang, Fan Yang, Yongkai Li, Xiaodong Fang, Lei Fu, Yan Huang, Hui Cao, Zhoukun Li, Zhongli Cui. Yeast β-1,3-glucan production by an outer membrane β-1,6-glucanase: process optimization, structural characterization and immunomodulatory activity. Food & function. 2022 Apr 04;13(7):3917-3930