RESUMEN
Proteins of the stress tolerant and mesophilic yeast were extracted using optimized protein extraction method and estimated by Bradford method. Immobilized pH gradient (IPG) strips were rehydrated with known concentrations of protein samples. Rehydrated IPG strips were run in isoelectric focusing (IEF) to separate the proteins on the basis of their pH gradient. 2DE gels were run, stained and image of the stress tolerant yeast was compared with the gel image of mesophilic yeast. The image analysis using the image master software resulted in the identification of differentially expressed spots in stress tolerant yeast. Among the differentially expressed spots, six were selected and characterized by MALDI-TOF as Enolase, Fructose bisphosphate aldolase, Alcohol dehydrogenase, 30KDa HSP, HSP70 and HSP90.