Evaluation of sample preparation protocols for proteomic analysisof sunflower leaves

摘要

Six protocols for extraction of proteins from sunflower (Helianthus annuus L.) leaves were evaluated fortheir abilities in both removing interferents and attaining the best resolution in two-dimensional gel elec-trophoresis. "Classical" phenol extraction followed by precipitation with ammonium acetate in methanoldisplayed the most efficient protocol, which allowed the detection of 244 protein spots with ca. 485 ofprotein in gel electrophoresis. Tandem mass spectrometry was performed to identify proteins in 61 spots,and cross species identification was used for this task. Proteins from twenty two spots were identified,and 12 of these proteins are up to now not included into the ExPASy sunflower protein databank.