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Identification of Arabidopsis salt and osmotic stress responsive proteins using two‐dimensional difference gel electrophoresis and mass spectrometry
Author(s) -
Ndimba Bongani K.,
Chivasa Stephen,
Simon William J.,
Slabas Antoni R.
Publication year - 2005
Publication title -
proteomics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.26
H-Index - 167
eISSN - 1615-9861
pISSN - 1615-9853
DOI - 10.1002/pmic.200401282
Subject(s) - biochemistry , osmotic shock , sorbitol , amino acid , gel electrophoresis , chemistry , heat shock protein , proteome , difference gel electrophoresis , proteomics , protein biosynthesis , hsp70 , biology , gene
Arabidopsis thaliana cell suspension cultures have been used to investigate the effects of salinity and hyperosmotic stress on plant cellular proteins. We show that 200 m M NaCl and 400 m M sorbitol treatments induce extracellular medium acidification in Arabidopsis cell cultures, a typical response of plant cells to salt and hyperosmotic stress. Using 35 S‐labelled amino acids, we demonstrated that NaCl causes a transient suppression of de novo protein synthesis, from which the cells recover within 4 h. Changes in the abundance of cellular proteins 6 h post NaCl and sorbitol treatments were analysed by 2‐DE. Of a total of 2,949 protein spots detected on the gels, 266 showed significant changes in abundance across five independent experiments. Using MALDI‐TOF MS, we identified 75 salt and sorbitol responsive spots. These fall into 10 functional categories that include H + transporting ATPases, signal transduction related proteins, transcription/translation related proteins, detoxifying enzymes, amino acid and purine biosynthesis related proteins, proteolytic enzymes, heat‐shock proteins, carbohydrate metabolism‐associated proteins and proteins with no known biological functions.