PMID:12964244
| Citation |
Richard, HT and Foster, JW (2003) Acid resistance in Escherichia coli. Adv. Appl. Microbiol. 52:167-86 |
|---|---|
| Abstract |
To colonize and cause disease, enteric pathogens must overcome environmental challenges that include acid stress in the host's stomach as well as short-chain fatty acid stress in the intestine of the host and reservoir. Three known inducible systems have evolved for stationary phase acid resistance in E. coli. These systems each provide a different level of protection with different requirements and induction conditions. Acid resistance system 1 (AR1) is acid induced in stationary phase, requires the presence of RpoS, and provides the least level of protection at pH 2.5. Acid resistance system 2 (AR2) is glutamate dependent and stationary phase induced, requires the presence of glutamate decarboxylase and a putative glutamate:GABA antiporter, and provides the highest level of protection. Acid resistance system 3 (AR3) is arginine dependent and acid induced under anaerobic conditions, requires the presence of arginine decarboxylase (AdiA), and provides only a modest level of protection. These three systems along with log phase acid tolerance protect cells from the acid stresses in both the reservoir and host, which can range from pH 2 to 4.5. They also protect against acid stress involved in food processing and facilitate the low infectious dose characteristic of E. coli, significantly contributing to the pathogenesis of this organism. |
| Links | |
| Keywords |
Escherichia coli/genetics; Escherichia coli/physiology; Escherichia coli Infections/metabolism; Escherichia coli Proteins/genetics; Escherichia coli Proteins/physiology; Hydrogen-Ion Concentration |
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