Comparative analysis of induction of osmotic-stress-dependent genes in Vibrio vulnificus exposed to hyper- and hypo-osmotic stress

被引:12
作者
Rao, Namrata V. [1 ]
Shashidhar, Ravindranath [1 ]
Bandekar, Jayant R. [1 ]
机构
[1] Bhabha Atom Res Ctr, Food Technol Div, Bombay 400085, Maharashtra, India
关键词
osmotic stress; quantitative real time PCR; compatible solutes; Vibrio vulnificus; OUTER-MEMBRANE PROTEINS; ESCHERICHIA-COLI; MECHANOSENSITIVE CHANNELS; PROTEOMIC ANALYSIS; EXPRESSION; RPOS; CHOLERAE; GROWTH; RESPONSES; SURVIVAL;
D O I
10.1139/cjm-2012-0749
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Vibrio vulnificus, a halophilic pathogenic bacterium of marine environments, encounters changes in salinity in its natural habitat and in the food-processing environment. The comparative response of V. vulnificus to hyperosmotic and hypoosmotic stress in terms of gene expression was investigated. Genes belonging to the proU operon for transport of compatible solutes and compatible solute synthesis were significantly upregulated (3- to 4.7-fold) under hyperosmotic stress. Under hypoosmotic stress, upregulation of genes coding for mechanosensitive channels of small conductance (mscS) was not observed. In hyperosmotic conditions a 2.3-fold decrease in the expression of aqpZ was observed. A 2-fold induction in gyrA was observed in V. vulnificus cells on exposure to hyperosmotic stress. groEL genes, VVA1659 (1.6-fold), and VV3106 (1-fold) were induced in hypoosmotic condition. Results of this study indicate that to manage hyperosmotic stress, V. vulnificus accumulated osmoprotectants through uptake or through endogenous synthesis of compatible solutes. Expression of mscS may not be necessary for immediate protection in cells exposed to hyper-and hypo-osmotic stress. Comparative analysis of important osmotic-stress-related genes showed up-or down-regulation of 14 genes in hyperosmotic stress as compared with up-or down-regulation of only 7 genes in hypoosmotic stress, indicating that the cells respond asymmetrically to hyper-and hypo-osmotic stress.
引用
收藏
页码:333 / 338
页数:6
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