Cell Chem Biol:研究揭示肠道有益菌群如何适应母乳

2017-04-12 佚名 科学网

母乳为宝宝提供了主要营养元素,同时也有益于寄生在婴儿胃肠道中的微生物。近日,刊登于《细胞—化学生物学》期刊上的研究显示,长双歧杆菌能通过产生一种名为LnbX的酶,成功适应婴儿肠道环境。这一机制使得该细菌能以仅在人奶中富含的糖类为食。

母乳为宝宝提供了主要营养元素,同时也有益于寄生在婴儿胃肠道中的微生物。近日,刊登于《细胞—化学生物学》期刊上的研究显示,长双歧杆菌能通过产生一种名为LnbX的酶,成功适应婴儿肠道环境。这一机制使得该细菌能以仅在人奶中富含的糖类为食。



“基于双歧杆菌能促进健康,我们的研究可能揭示了母乳驱动的肠道细菌和人类共生的进化轨迹。”该论文共同高级作者、日本京都大学的Takane Katayama说。

早期肠道细菌被认为对人体健康有长效影响,并且膳食会对肠道菌群产生巨大影响。例如,科学家认为,母乳中的乳糖能有选择地促进双歧杆菌等有益肠道菌群的生长。而母乳中的一个主要成分乳-N-四糖,并不存在于其他哺乳动物的乳汁中。而双歧杆菌产生的酶能分解这种糖,这表明这些微生物与人类的共生关系是后来进化而来的。

为了调查这种共生关系的进化,Katayama、 Shinya Fushinobu和同事,测定了LnbX催化区的X射线晶体结构,发现与LnbB 相比,LnbX有不同的结构和催化机理,因此属于一个水解酶新家族。

研究人员还表示,LnbX基因对长双歧杆菌B能依靠乳-N-四糖生存的能力十分重要。此外,排泄物DNA研究发现,与混合喂养的婴儿相比,长双歧杆菌B和LnbX基因在仅食用母乳的婴儿胃肠道内数量更多。

在未来研究中,Katayama团队计划调查其他能吸收母乳中糖分的产生不同酶的双歧杆菌。他们还将寻找能提高婴儿健康的双歧杆菌代谢物,以提高配方奶的营养。

原文出处:
Yamada C,et al.Molecular Insight into Evolution of Symbiosis between Breast-Fed Infants and a Member of the Human Gut Microbiome Bifidobacterium longum.Cell Chem Biol. 2017 Apr 4. pii: S2451-9456(17)30095-8. doi: 10.1016/j.chembiol.2017.03.012. 

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    2018-02-12 sunylz
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    2017-04-14 仁医06