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非模式菌醋酸菌科细菌的基本特征与合成生物学元件的表征

Characterization and synthetic biology elements of nonmodel bacteria, Acetobacteraceae

  • 摘要: 醋酸菌科细菌因其独特的生物学特性和所生产的细菌纤维素的广泛应用而备受关注。然而,与模式菌相比,醋酸菌科细菌基因改造难度大,且缺乏足够的基因调控元件,这些因素限制了其在合成生物学领域的应用。为克服这一挑战,本研究对三种常用的细菌纤维素生产菌株的基本性质和合成生物学元件进行了系统分析。首先,本研究评估了这三种菌株的基本特性,包括纤维素膜生产能力、分裂时间、抗生素敏感性及质粒特征。随后,在这三种菌株内表征了两种诱导型启动子(pTrc和pLux101)。结果显示,启动子pTrc在三种菌株中的调控性相对较低(诱导比:1.98–6.39),而启动子pLux101则显示出显著更高的调控性(诱导比:87.28–216.71)。最后,通过基因敲除实验,本研究确认了Gluconacetobacter hansenii ATCC 5358菌株基因组中四个细菌纤维素膜生成的必需基因。本研究不仅丰富了非模式菌内的合成生物学元件库,还为醋酸菌科细菌的合成生物学应用奠定了基础。

     

    Abstract: Acetobacteraceae has garnered significant attention because of its unique properties and the broad applications of the bacterial cellulose it produces. However, unlike model strains, Acetobacteraceae have few synthetic biology applications because they are difficult to manipulate genetically and have insufficient genetic regulatory elements, among other factors. To address this limitation, this study characterized the fundamental properties and synthetic biology elements of three commonly used bacterial cellulose-producing strains. First, the basic characteristics of the three strains, including their cellulose film production ability, division time, antibiotic susceptibility, and plasmid features, were analyzed. Two inducible promoters (pTrc and pLux101) were subsequently characterized within the three strains. The inducibility of the pTrc promoter was relatively low across the three strains (induction ratio: 1.98–6.39), whereas the pLux101 promoter demonstrated a significantly greater level of inducibility within the three strains (induction ratio: 87.28–216.71). Finally, through gene knockout experiments, this study identified four genes essential for bacterial cellulose film production in the genome of the Gluconacetobacter hansenii ATCC 5358 strain. This study not only enriches the library of synthetic biology elements in nonmodel strains, but also lays the foundation for the synthetic biology applications of Acetobacteraceae.

     

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