Lactobacillus casei combats acid stress by maintaining cell membrane functionality

被引:174
作者
Wu, Chongde [1 ,2 ]
Zhang, Juan [1 ,2 ]
Wang, Miao [3 ]
Du, Guocheng [1 ,2 ,4 ]
Chen, Jian [1 ,2 ,4 ]
机构
[1] Jiangnan Univ, Sch Biotechnol, Wuxi 214122, Peoples R China
[2] Jiangnan Univ, Minist Educ, Key Lab Ind Biotechnol, Wuxi 214122, Peoples R China
[3] Jiangnan Univ, Sch Food Sci & Technol, Wuxi 214122, Peoples R China
[4] Jiangnan Univ, State Key Lab Food Sci & Technol, Wuxi 214122, Peoples R China
基金
中国国家自然科学基金;
关键词
Acid stress; Lactobacillus casei; Membrane fluidity; Membrane fatty acids; LOW PH; LACTOCOCCUS-LACTIS; ESCHERICHIA-COLI; STREPTOCOCCUS-MUTANS; ENVIRONMENTAL-STRESS; OUTER-MEMBRANE; OSMOTIC-STRESS; BACTERIA; ADAPTATION; SURVIVAL;
D O I
10.1007/s10295-012-1104-2
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Lactobacillus casei strains have traditionally been recognized as probiotics and frequently used as adjunct culture in fermented dairy products where lactic acid stress is a frequently encountered environmental condition. We have investigated the effect of lactic acid stress on the cell membrane of L. casei Zhang [wild type (WT)] and its acid-resistant mutant Lbz-2. Both strains were grown under glucose-limiting conditions in chemostats; following challenge by low pH, the cell membrane stress responses were investigated. In response to acid stress, cell membrane fluidity decreased and its fatty acid composition changed to reduce the damage caused by lactic acid. Compared with the WT, the acid-resistant mutant exhibited numerous survival advantages, such as higher membrane fluidity, higher proportions of unsaturated fatty acids, and higher mean chain length. In addition, cell integrity analysis showed that the mutant maintained a more intact cellular structure and lower membrane permeability after environmental acidification. These results indicate that alteration in membrane fluidity, fatty acid distribution, and cell integrity are common mechanisms utilized by L. casei to withstand severe acidification and to reduce the deleterious effect of lactic acid on the cell membrane. This detailed comparison of cell membrane responses between the WT and mutant add to our knowledge of the acid stress adaptation and thus enable new strategies to be developed aimed at improving the industrial performance of this species under acid stress.
引用
收藏
页码:1031 / 1039
页数:9
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