單增李斯特菌prfA基因缺失菌株的構(gòu)建及其生物學(xué)特性鑒定
[Abstract]:Listeria monocytogenes (Listeria monocytogenes,Lm) is a kind of foodborne pathogenic bacteria with high risk. The expression of most virulence genes of Listeria monocytogenes (Listeria monocytogenes,Lm) is regulated in whole or in part by the PrfA (positive regulatory factorA) protein encoded by prfA gene. Homologous recombination was used to knockout the prfA gene of Lm wild strain EGDe, and the biological characteristics of single deletion strain EGDe- 螖 prfA were studied by measuring growth curve, virulence gene expression and ability of invading Caco-2 cells. The growth curve showed that there was no difference between prfA knockout and wild-type EGDe, and the expression of main virulence genes of EGDe- 螖 prfA was detected by real-time quantitative fluorescence polymerase chain reaction. The results showed that the expression of virulence gene of plcA,plcB increased to 2.5 times and 2 times of the original, inlA,inlB,inlC,actA,vip and so on showed a downward trend, prfA gene expression tended to zero, and invasion of Caco-2 cells showed that the number of EGDe- 螖 prfA invasion was 1 / 5 of that of the wild strain. The construction and biological characteristics of this gene deletion strain are of great significance for the study of pathogenic mechanism of foodborne pathogenic bacteria EGDe and provide important materials.
【作者單位】: 上海理工大學(xué)醫(yī)療器械與食品學(xué)院;
【基金】:國家自然科學(xué)基金面上項(xiàng)目(31371776) 上海市科委“科技創(chuàng)新行動(dòng)計(jì)劃”長三角科技聯(lián)合攻關(guān)領(lǐng)域項(xiàng)目(15395810900) 上海理工大學(xué)研究生創(chuàng)新基金資助項(xiàng)目;上海理工大學(xué)微創(chuàng)勵(lì)志創(chuàng)新基金項(xiàng)目
【分類號(hào)】:TS201.3
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