Proteomics Research on Salt Response of L. plantarum FS5-5 Grown at Different NaCl Concentrations Using Two-Dimensional Gel Electrophoresis

Abstract:

L. plantarum FS5-5，isolated from traditional home-made fermented soybean in northeast of China，has been considered as a new salt tolerance bacterium. Proteomics research were carried out to identify proteins expression of L. plantarum FS5-5 grown at different NaCl concentrations of 0% and 3% in this study. Cytosolic proteins of mid-exponential phase were resolved and further analyzed by two-dimensional gel electrophoresis. The results showed that sixteen protein spots were found with statistically significant differences.Twelve of total protein spots were identified as UDP-N-acetylglucosamine diphosphorylase，glucose-6-phosphate 1-dehydrogenase，UDP-N- acetylmuramoylalanine-D-glutamate ligase，adenylosuccinate synthetase，cysteine aminopeptidase，prophage protein，pyruvate kinase，ABC transporter（iron-sulfur cluster assembly protein），bile salt hydrolase，glutamine synthetase，6-phosphogluconate dehydrogenase，Xaa-Pro dipeptidase using matrix-assisted laser desorption /ionization timeof-flight mass spectrometry （MALDI-TOF/MS），indicating the complex response of lactic acid bacteria to salt stress．