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| Transcriptomic and Phenotypic Responses of Listeria monocytogenes Strains Possessing Different Growth Efficiencies under Acidic Conditions。In an experiment delineating aciduric strains, food and clinical Listeria monocytogenes isolates tended to produce the most biomass whereas ovine and avian strains produced comparatively less biomass when exposed to high levels of sodium diacetate (SD) and potassium sorbate. Compared to reference strains that exhibited greater acid sensitivity, representative food isolates with comparatively good growth capacities in the presence of 21 mM SD at pH 5.0 accumulated reduced levels of acetate anion and K+ ion. The aciduric nature of SD-resistant strains was also reflected by comparatively high tolerance to pH 2.4 (HCl) acid challenges, a property boosted by the presence of SD. Exposure to elevated levels of SD (21 mM SD at pH 5.0) was found to have broad effects on gene expression, as differentiated from effects caused by mildly acidic conditions (pH 5.0). SD-resistant strain FW04/0025 was more responsive to elevated SD, increasing the expression of 222 genes (>2-fold change [P < 0.05]), compared to the more sensitive EGD reference strain, which exhibited increases in expression of 112 genes. Key differences between the strains in relation to SD-enhanced transcripts were notably associated with the cell envelope, oxidative stress management, and intermediary metabolism. SD thus appears to differentially influence growth efficiency and survival of strains, under conditions relevant to acidic foods, that could be due to altered cell wall and metabolic phenotypes. |
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| 轉(zhuǎn)錄組學(xué)以及表象的單核細胞增多性李氏桿菌株的反應(yīng)在酸性的條件下具有不同的生長效率。在實驗過程中圈定的嗜酸菌株中，當(dāng)被暴露在高濃度的雙乙酸鈉和山梨酸鉀條件下時，食品和臨床中分離的單核細胞增多性李氏桿菌傾向于產(chǎn)生最多的生物質(zhì)，而ovine菌株和avain菌株則產(chǎn)生較少的生物質(zhì)。與對照的菌株相比，以上菌株展現(xiàn)出極強的酸性敏感性，其中生長能力相對好的食品的分離株具有代表性，當(dāng)它在21mMSD，pH=5.0時，醋酸根離子和鉀離子含量降低。這種嗜酸的特性同時也可以通過對于pH=2.4的鹽酸的高抗拒性表現(xiàn)出來，這種性能正是引入SD所促進的。在較高的SD存在量下（21mM pH=5.0），與溫和的酸性條件下比，其對于基因的表達有著廣泛的影響�？筍D的菌株 FW04/0025對于較高的SD含量的響應(yīng)更為強烈，與更為敏感的EGD對照株相比，其增加了222個基因的表達（），而對照株增加了112個基因的表達。普通的轉(zhuǎn)錄與SD加強的轉(zhuǎn)錄的最重要的不同點與細胞膜，（氧化應(yīng)激性），中間代謝有著重要聯(lián)系。因此對于生長效率以及菌株的存活，在酸性食物的條件下，SD呈現(xiàn)出不同的影響特性，這可能是細胞壁以及代謝表型的變化引起的。 |
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