海洋生态系统中含有丰富的细菌性囊泡(Bacterial Vesicles in Marine Ecosystems)

由于细菌囊泡(Bacterial vesicles)在病原菌的致病过程中具有重要作用,因此越来越受到人们的重视。但是在非致病菌中,这种囊泡的结构和生态作用却研究得很少。

已知很多异养型细菌都能够释放囊泡(Vesicle)到胞外,从而促进细菌与细菌之间,以及细菌与环境之间的相互作用。目前还没有报道自养型细菌能产生囊泡。在自然生态环境中,囊泡的特征和作用也不清楚。Biller等在2014年1月的《科学》(Science)杂志报道了原绿球藻(Prochlorococcus)(海洋中含量非常丰富的一种蓝藻)能够持续释放大量脂质囊泡(lipid vesicles),囊泡中含有蛋白质、DNA和RNA。在沿海和公海海域都大量含有这种来源于不同细菌的携带DNA的囊泡。原绿球藻能够支持异养型细菌的生长。细菌囊泡携带多种成份进行传递,促进了海洋微生物世界之间的信息流、能量流和生物分子流。

参考文献:

Biller SJ, Schubotz F, Roggensack SE, et al. Bacterial vesicles in marine ecosystems. Science. 2014,10;343(6167):183-186.

Abstract

Many heterotrophic bacteria are known to release extracellular vesicles, facilitating interactions between cells and their environment from a distance. Vesicle production has not been described in photoautotrophs, however, and the prevalence and characteristics of vesicles in natural ecosystems is unknown. Here, we report that cultures of Prochlorococcus, a numerically dominant marine cyanobacterium, continuously release lipid vesicles containing proteins, DNA, and RNA. We also show that vesicles carrying DNA from diverse bacteria are abundant in coastal and open-ocean seawater samples. Prochlorococcus vesicles can support the growth of heterotrophic bacterial cultures, which implicates these structures in marine carbon flux. The ability of vesicles to deliver diverse compounds in discrete packages adds another layer of complexity to the flow of information, energy, and biomolecules in marine microbial communities.

    日期:2014年03月04日  分类:病原菌
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