Specificity of polysaccharide use in intestinal bacteroides species determines diet-induced microbiota alterations.

Specificity of polysaccharide use in intestinal bacteroides species determines diet-induced microbiota alterations.
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DOI:
10.1016/j.cell.2010.05.005
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发表时间:
2010-06-25
期刊:
影响因子:
64.5
通讯作者:
Sonnenburg JL
Sonnenburg JL
中科院分区:
生物学1区
文献类型:
--
作者:
Sonnenburg ED;Zheng H;Joglekar P;Higginbottom SK;Firbank SJ;Bolam DN;Sonnenburg JL

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The intestinal microbiota impacts many facets of human health and is associated with human diseases. Diet impacts microbiota composition, yet mechanisms that link dietary changes to microbiota alterations remain ill-defined. Here we elucidate the basis of Bacteroides proliferation in response to fructans, a class of fructose-based dietary polysaccharides. Structural and genetic analysis disclosed a fructose-binding, hybrid-two-component signaling sensor that controls the fructan utilization locus in Bacteroides thetaiotaomicron. Gene content of this locus differs among Bacteroides species and dictates the specificity and breadth of utilizable fructans. BT1760, an extracellular β2-6 endo-fructanase, distinguishes B. thetaiotaomicron genetically and functionally, and enables the use of the β2-6-linked fructan levan. The genetic and functional differences between Bacteroides species are predictive of in vivo competitiveness in the presence of dietary fructans. Genes that differentiate function serve as potential biomarkers in microbiomic datasets to enable rational manipulation of the microbiota via diet.
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