Maerani Maerani, Dewanti-Hariyadi Ratih, Nurjanah Siti
Department of Food Science and Technology, Bogor Agricultural University, Bogor, Kampus IPB Dramaga, PO Box 220 16002, West Java 16680 Indonesia.
Southeast Asian Food and Agricultural Science and Technology (SEAFAST) Center, Bogor Agricultural University, Bogor, West Java 16680 Indonesia.
Food Sci Biotechnol. 2020 May 3;29(9):1273-1279. doi: 10.1007/s10068-020-00763-1. eCollection 2020 Sep.
This research aimed to evaluate the effect of acid stress on the expression of stress regulator ( and ) and virulence ( and ) genes of Yrt2a. The results showed that Yrt2a experienced decrease in number during acid stress and was no longer culturable 90 min post exposure to pH 3.0. During acid stress, the expression of , , and was upregulated by 2.15; 2.19; 1.55; 1.1 and 1.41 log, respectively. However, all genes expression was downregulated when the bacteria entered the unculturable state. The expression of gene decreased to 1.04; 0.37; 0.84 and 1.71 log, respectively; while gene expression reached a level lower than that of control. This research implies a supposition that during acid stress, was capable of maintaining its culturability and pathogenicity until they are no longer culturable.
本研究旨在评估酸应激对Yrt2a应激调节基因(和)及毒力基因(和)表达的影响。结果显示,Yrt2a在酸应激期间数量减少,暴露于pH 3.0 90分钟后不再可培养。在酸应激期间,、、和的表达分别上调了2.15、2.19、1.55、1.1和1.41个对数。然而,当细菌进入不可培养状态时,所有基因的表达均下调。基因的表达分别降至1.04、0.37、0.84和1.71个对数;而基因表达达到低于对照的水平。本研究表明一种假设,即在酸应激期间,能够维持其可培养性和致病性,直到它们不再可培养。