The low-salt stimulon in Vibrio parahaemolyticus.

The low-salt stimulon in Vibrio parahaemolyticus.
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副溶血弧菌的低盐刺激。

DOI:
10.1016/j.ijfoodmicro.2009.11.006
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发表时间:
2010-01
影响因子:
5.4
通讯作者:
--
中科院分区:
农林科学1区
文献类型:
--
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副溶血性弧菌是引起海产品相关细菌性胃肠炎的主要原因,是一种中度嗜盐、需要盐的细菌。比较了在2%和0.66%氯化钠条件下生长的副溶血弧菌的整体基因表达谱,以确定低盐刺激蛋白。与0.66%的氯化钠相比,2%的盐胁迫下,与0.66%的盐相比,合成亲和溶质外生碱的ectABC-lysC操纵子以及3个亲和的溶质运输系统,即Prou(甘氨酸甜菜碱)、OpuD(甘氨酸甜菜碱)和Pot2(亚精胺)的表达上调。2%的氯化钠条件有利于OmpW、OmpN和OmpA2的诱导表达,而抑制了OmpA1、OmpU和VP1008的表达。这些结果表明,为了控制盐环境的高渗透胁迫,副溶血弧菌不仅可能通过吸收或内源合成相容的溶质来积累渗透保护剂,而且还可能重塑其外膜蛋白的轮廓,以恢复其细胞膜。上述差异调控基因为进一步研究副溶血性弧菌渗透适应的分子机制提供了新的候选基因。
Vibrio parahaemolyticus is the leading cause of seafood-associated bacterial gastroenteritis and is a moderately halophilic, salt-requiring bacterium. Global gene expression profiles of V. parahaemolyticus grown under 2% and 0.66% NaCl were compared to define the low-salt stimulon. The ectABC-lysC operon for synthesis of the compatible solute ectoine, as well as three compatible solute transport systems, namely ProU (glycine betaine), OpuD1 (glycine betaine) and Pot2 (spermidine), was up-regulated under 2% NaCl relative to 0.66% NaCl. The 2% NaCl condition favored the inducible expression of OmpW, OmpN and OmpA2, while repressed the expression of OmpA1, OmpU and VP1008. These results indicated that, to master the hyperosmotic stress of saline environments, V. parahaemolyticus might not only accumulate osmoprotectants through uptake or endogenous synthesis of compatible solutes, but also remodel its profiles of outer membrane protein to restore its cell membrane. The above differentially regulated genes will provide novel candidates for the further investigation of the molecular mechanisms of osmoadaptation in V. parahaemolyticus.
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