title: Proteomic analysis of salinity-stressed Chlamydomonas reinhardtii revealed differential suppression and induction of a large number of important housekeeping proteins.
abstract: Salinity stress is one of the most common abiotic stresses that hamper plant productivity worldwide. Successful plant adaptations to salt stress require substantial changes in cellular protein expression. In this work, we present a 2-DE-based proteomic analysis of a model unicellular green alga, Chlamydomonas reinhardtii, subjected to 300 mM NaCl for 2 h. Results showed that, in addition to the protein spots that showed partial up- or down-regulation patterns, a number of proteins were exclusively present in the proteome of the control cells, but were absent from the salinity-stressed samples. Conversely, a large number of proteins exclusively appeared in the proteome of the salinity-stressed samples. Of those exclusive proteins, we could successfully identify, via LC-MS/MS, 18 spots uniquely present in the control cells and 99 spots specific to NaCl-treated cells. Interestingly, among the salt-exclusive protein spots, we identified several important housekeeping proteins like molecular chaperones and proteins of the translation machinery, suggesting that they may originate from post-translational modifications rather than from de novo biosynthesis. The possible role and the salt-specific modification of these proteins by salinity stress are discussed.
authors.affiliation: Department of Biochemistry, Kasetsart University, Bangkok 10900, Thailand.
authors.forename: Chotika
authors.initials: C
authors.lastname: Yokthongwattana
authors.forename: Bancha
authors.initials: B
authors.lastname: Mahong
authors.forename: Sittiruk
authors.initials: S
authors.lastname: Roytrakul
authors.forename: Narumon
authors.initials: N
authors.lastname: Phaonaklop
authors.forename: Jarunya
authors.initials: J
authors.lastname: Narangajavana
authors.forename: Kittisak
authors.initials: K
authors.lastname: Yokthongwattana
mesh_terms: D016825:Chlamydomonas reinhardtii / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D010940:Plant Proteins / Q000378:metabolism*; D040901:Proteomics / Q000379:methods*; D012965:Sodium Chloride / Q000494:pharmacology*; D053719:Tandem Mass Spectrometry
chemical_list: D010940:Plant Proteins; D012965:Sodium Chloride