Mucosal glycan foraging enhances fitness and transmission of a saccharolytic human gut bacterial symbiont.

Mucosal glycan foraging enhances fitness and transmission of a saccharolytic human gut bacterial symbiont.
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DOI:
10.1016/j.chom.2008.09.007
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发表时间:
2008-11-13
影响因子:
30.3
通讯作者:
Gordon JI
Gordon JI
中科院分区:
医学1区
文献类型:
--
作者:
Martens EC;Chiang HC;Gordon JI

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人类的远端肠道是一个微生物生物反应器,可以消化复杂的碳水化合物。肠道微生物感知和处理不同的多糖的策略对于这个生态系统的组装和运行具有重要的意义。人类肠道细菌类杆菌以寄主和饮食中的多糖为食。其靶向这些底物的能力存在于88个多糖利用基因座(Puls),占其基因组的18%。在这份报告中,全基因组转录图谱和基因测试被用来确定宿主多糖在体内和体外觅食的机制。确定了针对所有主要宿主多糖类别的PULs。粘蛋白O-葡聚糖是体内觅食的主要底物。同时缺失激活粘蛋白O-葡聚糖利用的五个ECF-σ转录因子会在肠道和母子传播中产生细菌持久性缺陷。因此,PUL介导的多糖分解代谢是肠道定植的一个重要因素,并可能影响肠道生态。
The distal human gut is a microbial bioreactor that digests complex carbohydrates. The strategies evolved by gut microbes to sense and process diverse glycans have important implications for the assembly and operations of this ecosystem. The human gut bacterium Bacteroides thetaiotaomicron forages on host and dietary glycans. Its ability to target these substrates resides in 88 polysaccharide utilization loci (PULs), encompassing 18% of its genome. In this report, whole-genome transcriptional profiling and genetic tests are used to define the mechanisms underlying host glycan foraging in vivo and in vitro. PULs that target all major classes of host glycans were identified. Mucin O-glycans are the principal substrate foraged in vivo. Simultaneous deletion of five ECF-σ transcription factors that activate mucin O-glycan utilization produces defects in bacterial persistence in the gut and in mother-to-offspring transmission. Thus, PUL-mediated glycan catabolism is an important factor in gut colonization and likely impacts gut ecology.
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