甘露聚糖
生物
拟杆菌
聚糖
甘露糖
双歧杆菌
生物化学
产气荚膜梭菌
拟杆菌
微生物学
多糖
细菌
乳酸菌
糖蛋白
遗传学
作者
Ge Gao,Jiawen Cao,Lan Mi,Dan Feng,Qian Deng,Xiao-Bao Sun,Huien Zhang,Qian Wang,Jiakun Wang
标识
DOI:10.1016/j.ijbiomac.2021.07.172
摘要
Symbiotic bacteria, including members of the Bacteroides genus, are known to digest dietary fibers in the gastrointestinal tract. The metabolism of complex carbohydrates is restricted to a specified subset of species and is likely orchestrated by polysaccharide utilization loci (PULs) in these microorganisms. β-Mannans are plant cell wall polysaccharides that are commonly found in human nutrients. Here, we report the structural basis of a PUL cluster, BdPUL12, which controls β-mannan-like glycan catabolism in Bacteroides dorei. Detailed biochemical characterization and targeted gene disruption studies demonstrated that a key glycoside hydrolase, BdP12GH26, performs the initial attack on galactomannan or glucomannan likely via an endo-acting mode, generating mannooligosaccharides and mannose. Importantly, coculture assays showed that the B. dorei promoted the proliferation of Lactobacillus helveticus and Bifidobacterium adolescentis, likely by sharing mannooligosaccharides and mannose with these gut probiotics. Our findings provide new insights into carbohydrate metabolism in gut-inhabiting bacteria and lay a foundation for novel probiotic development.
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