一种新的黑曲霉培养全细胞催化剂用于橙皮苷(HES)的级联水解,以生产高转化率(90%以上)的高价值橙皮素-7-O-葡萄糖苷(HG)和橙皮素。此外,所使用的诱导剂被证明可用于细胞生长并诱导细胞产生特定的酶。值得注意的是,诱导剂的类型决定了细胞是否可以水解 HES。产品组成也可以通过调整不同的诱导剂来控制。转录组分析表明柚皮苷-vs-空白组和蔗糖-vs-空白组的基因表达存在明显差异。柚皮苷-vs-空白组主要是上调的差异表达基因(DEGs),而蔗糖-vs-空白组主要是下调的差异表达基因(DEGs)。基因本体论(GO)分析表明,无论是加入柚皮苷还是蔗糖作为诱导剂,都会极大地影响细胞的催化活性。此外,发现了3个与鼠李糖苷酶相关的基因、14个与葡萄糖苷酶相关的基因和5个与水解酶活性相关的基因。这些基因不仅参与鼠李糖苷酶和葡萄糖苷酶的活性,而且还参与剪接体以及蔗糖和淀粉代谢途径。定量实时聚合酶链反应(qRT-PCR)分析表明转录组测序结果可靠。该研究提供了一种水解 HES 的新方法,以及理解与全细胞催化剂水解相关的机制的新视角。发现了14个与葡萄糖苷酶相关的基因和5个与水解酶活性相关的基因。这些基因不仅参与鼠李糖苷酶和葡萄糖苷酶的活性,而且还参与剪接体以及蔗糖和淀粉代谢途径。定量实时聚合酶链反应(qRT-PCR)分析表明转录组测序结果可靠。该研究提供了一种水解 HES 的新方法,以及理解与全细胞催化剂水解相关的机制的新视角。发现了14个与葡萄糖苷酶相关的基因和5个与水解酶活性相关的基因。这些基因不仅参与鼠李糖苷酶和葡萄糖苷酶的活性,而且还参与剪接体以及蔗糖和淀粉代谢途径。定量实时聚合酶链反应(qRT-PCR)分析表明转录组测序结果可靠。该研究提供了一种水解 HES 的新方法,以及理解与全细胞催化剂水解相关的机制的新视角。定量实时聚合酶链反应(qRT-PCR)分析表明转录组测序结果可靠。该研究提供了一种水解 HES 的新方法,以及理解与全细胞催化剂水解相关的机制的新视角。定量实时聚合酶链反应(qRT-PCR)分析表明转录组测序结果可靠。该研究提供了一种水解 HES 的新方法,以及理解与全细胞催化剂水解相关的机制的新视角。
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Comparative transcriptomics to reveal the mechanism of enhanced catalytic activities of Aspergillus niger whole-cells cultured with different inducers in hydrolysis of citrus flavonoids
A new Aspergillus niger whole-cell catalyst was cultured for the cascade hydrolysis of hesperidin (HES) to produce high-value hesperetin-7-O-glucoside (HG) and hesperetin with high conversion (above 90%). Moreover, the inducers used were shown to be useful for cell growth and to induce cells to produce specific enzymes. Remarkably, the type of inducers determined whether the cells can hydrolyze HES. The product composition was also controllable by adjusting different inducers. Transcriptome analysis suggested that both naringin-vs-blank group and saccharose-vs-blank group had obviously difference in gene expression. The naringin-vs-blank group was mainly up-regulated differentially expressed genes (DEGs), while saccharose-vs-blank group was mainly down-regulated DEGs. The Gene Ontology (GO) analysis showed that whether naringin or saccharose was added as an inducer would greatly affect the catalytic activity of cells. Furthermore, 3 genes related to rhamnosidase, 14 genes related to glucosidase and 5 genes related to hydrolase activity were found. These genes were not only involved in rhamnosidase and glucosidase activities, but also spliceosome and the sucrose and starch metabolic pathways. The quantitative real-time polymerase chain reaction (qRT-PCR) analysis indicated that the results of transcriptome sequencing were reliable. This study gave a new approach to hydrolyze HES, and new perspectives to understand the mechanisms associated with the hydrolysis of whole-cell catalyst.