Protein Extraction For Proteome Analysis From Cacao Leaves And Meristems, Organs Infected By Moniliophthora Perniciosa, The Causal Agent Of The Witches' Broom Disease

Preparation of high-quality proteins from cacao vegetative organs is difficult due to very high endogenous levels of polysaccharides and polyphenols. In order to establish a routine procedure for the application of proteomic and biochemical analysis to cacao tissues, three new protocols were developed; one for apoplastic washing fluid (AWF) extraction, and two for protein extraction - under denaturing and nondenaturing conditions. The first described method allows a quick and easy collection of AWF - using infiltration-centfifugation procedure - that is representative of its composition in intact leaves according to the smaller symplastic contamination detected by the use of the hexose phosphate isomerase marker. Protein extraction under denaturing conditions for 2-DE was remarkably improved by the combination of chemically and physically modified processes including phenol, SDS dense buffer and sonication steps. 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