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Biosynthesis, characterization and potentiality of lipopeptides produced by Bacillus flexus S1 without inductive carbon sources

机译：Bacillus Flexis S1没有感应碳源的脂肽的生物合成，表征和潜力

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This study newly isolated a bacterial stain of Bacillus flexus S1 which had abilities of synthesizing lipopeptides without any inductive operations, and thus it could effectively save operational procedures or cost. This microorganism produced 1.53 g L ~(?1) of lipopeptides with a basal medium, which was 2.59-fold higher than that with an inductive medium. Meanwhile, the sfp gene was highly expressed under non-inductive conditions. The results firstly noted micellization characteristics of a biosurfactant, including a 46.04 mg L ~(?1) critical micelle concentration, the main chemical structure, and micelles mainly distributing at 30.2–52.5 nm and 181.9–239.9 nm. The lipopeptides indicated good stability over a temperature range of 30–50 °C and pH range of 6–9. Furthermore, monatomic (K ~(+) and Na ~(+) ) and divalent (Ca ~(2+) and Mg ~(2+) ) ions respectively alleviated generating smaller and bigger micellar aggregates. The lipopeptides could effectively increase the solubility of hydrophobic organic carbons. As the lipopeptides were adopted together with oil-degrading bacteria, it increased the hydrophobicity of bacterial cells by 1.92–3.04 fold, and had low toxicity to bacterial cells. This study not only provided a new lipopeptides producing bacterium which did not need any conductive operations, but also systematically investigated the characteristics of lipopeptides, providing impactful significance for commercial application.
机译：本研究新近分离了Bacillus Flexis S1的细菌染色，其具有合成脂肽而没有任何感应操作的能力，因此它可以有效节省运营程序或成本。该微生物用基础培养基产生1.53g L〜（α1）的脂肽，其比具有诱导介质的2.59倍。同时，在非诱导条件下，SFP基因高度表达。结果首先注意到生物活性剂的胶束化特性，包括46.04mg L〜（α1）临界胶束浓度，主要的化学结构和胶束主要分布在30.2-52.5nm和181.9-239.9nm。脂肽在30-50℃和6-9的pH范围内显示出良好的稳定性。此外，分别减轻了产生较小和更大的胶束聚集体的二丙基（K〜（+）和Na〜（+））和二价（Ca〜（2+）和Mg〜（2+）离子。脂肽可以有效地增加疏水性有机碳的溶解度。随着脂肽与油脂降解细菌一起采用，它将细菌细胞的疏水性增加1.92-3.04倍，对细菌细胞具有低毒性。这项研究不仅提供了一种产生不需要任何导电操作的细菌的新脂肽，而且还系统地研究了脂肪肽的特征，为商业应用提供了积极的意义。

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