Human gut microbes use multiple transporters to distinguish vitamin B₁₂ analogs and compete in the gut.

Human gut microbes use multiple transporters to distinguish vitamin B₁₂ analogs and compete in the gut.
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DOI:
10.1016/j.chom.2013.12.007
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发表时间:
2014-01-15
影响因子:
30.3
通讯作者:
Goodman AL
Goodman AL
中科院分区:
医学1区
文献类型:
--
作者:
Degnan PH;Barry NA;Mok KC;Taga ME;Goodman AL

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基因组和宏基因组测序工作,包括人类微生物组项目,揭示了微生物通常编码似乎完成相同任务的多个系统。这些预测是否反映了实际的功能冗余尚不清楚。我们报告说,突出的人类肠道共生体多形拟杆菌采用三个功能,同源维生素B12转运蛋白,在至少两种情况下,赋予不同的B12类似物(corrinoids)的存在下的竞争优势。在哺乳动物肠道中,微生物适合度可以通过单个转运蛋白的存在或不存在来确定。人肠道微生物组中不同的类可丽素转运蛋白家族的总数可能超过在B中观察到的那些。以一个数量级的速度增加。这些结果表明,人类肠道微生物使用复杂的机制来捕获和区分体内的corrinoids,并且在这些基因组中观察到的明显冗余可以反映隐藏的特异性,这些特异性决定了微生物是否会在其宿主中定植。
Genomic and metagenomic sequencing efforts, including human microbiome projects, reveal that microbes often encode multiple systems that appear to accomplish the same task. Whether these predictions reflect actual functional redundancies is unclear. We report that the prominent human gut symbiont Bacteroides thetaiotaomicron employs three functional, homologous vitamin B12 transporters that in at least two cases confer a competitive advantage in the presence of distinct B12 analogs (corrinoids). In the mammalian gut, microbial fitness can be determined by the presence or absence of a single transporter. The total number of distinct corrinoid transporter families in the human gut microbiome likely exceeds those observed in B. thetaiotaomicron by an order of magnitude. These results demonstrate that human gut microbes use elaborate mechanisms to capture and differentiate corrinoids in vivo and that apparent redundancies observed in these genomes can instead reflect hidden specificities that determine whether a microbe will colonize its host.
DOI: 10.1016/j.chom.2008.09.007
发表时间: 2008-11-13
影响因子: 30.3
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影响因子: 3.2
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影响因子: 39.2
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