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acid stress response in environmental and clinical strains of enteric bacteria

Frontiers in Biology 2012年第6期7卷 495-505页

作者： Gabriel J. SWENSON J. STOCHASTIC Franklyn F. BOLANDER, Jr. Richard A. LONG Biological Sciences University of South Carolina Columbia SC 29208 USA Marine Science Program University of South Carolina Columbia SC 29208 USA Biology Department Paine College Augusta GA 30901 USA

The success of many enteric bacteria is hinged on the ability to tolerate environmental stress such as extreme acidity. The acid stress response （ASR） has been investigated in many enteric bacteria and has been shown to involve variable expression of a broad spectrum of genes involved in transcriptional regulation, metabolism, colonization and virulence; representing a linkage between acid tolerance and pathogenicity. Though the majority of ASR studies have been conducted in laboratory conditions and from the perspective of pathogenicity, the role of environmental reservoirs on acid adaptation has recently emerged as an important aspect of pathogenic microbial ecology. This mini-review profiles ASR in three opportunistic enteric pathogens and synthesizes recent work pertaining to the study of this dynamic response.

关键词： acid stress response enteric bacteria microbial ecology transcriptional regulation virulence

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The Effect of acid stress Treatment on Viability and Membrane Fatty acid Composition of Oenococcus oeni SD-2a

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Agricultural Sciences in China 2009年第3期8卷 311-316页

作者： ZHAO Wen-ying LI Hua WANG Hua LI Zhong-chao WANG Ai-lian College of Enology Northwest A＆F University Yangling 712100 P.R.China College of Chemical Engineering and Environment North University of China Taiyuan 030051 P.R.China

To obtain ready-to-use wine malolactic starter cultures with high viability, the effects of acid stress treatments on the growth, inoculation viability, freeze-drying viability, and membrane fatty acid composition of the native Oenococcus oeni SD-2a strain were studied. The results showed that pH 3.5 and 3.2 adaptive treatments did not strongly decrease cell biomass but increased distinctly inoculation viability and freeze-drying viability. Concerning the membrane fatty acid composition, it was observed that acid stress conditions increased significantly the relative concentration of lactobacillic acid （C19cycl 1） and the unsaturated：saturated fatty acid ratio in cell membrane lipids. We assumed that acid-induced cross protective responses could be used in preparing ready-to-use O. oeni SD-2a malolactic starter cultures, and the accumulation of lactobacillic acid in the membrane of O. oeni SD-2a cells appears as an acid stress response mechanism, which might be related with the enhanced viability.

关键词： Oenococcus oeni acid stress response membrane fatty acid composition

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