title: Protein extraction for two-dimensional electrophoresis from olive leaf, a plant tissue containing high levels of interfering compounds.
abstract: The purpose of this research is to establish a routine procedure for the application of proteomic analysis to olive tree. Olive leaf tissue is notoriously recalcitrant to common protein extraction methods due to high levels of interfering compounds. We developed a protocol for isolating proteins suitable for two-dimensional electrophoresis (2-DE) from olive leaf. The remarkable characteristics of the protocol include: (i) additional grinding dry acetone powder of leaf tissue to a finer extent, (ii) after extensive organic solvent washes to remove pigments, lipids etc., using aqueous tricholoroacetic acid washes to remove water-soluble contaminants, and (iii) phenol extraction of proteins in the presence of sodium dodecyl sulfate. The final protein preparation is free of interfering compounds based on its well-resolved 2-DE patterns. The protocol can be completed within 3 h, and protein yield is approximately 2.49 mg.g(-1) of aged leaf. We also evaluated the protocol by immunoblotting with anti-tyrosinate alpha-tubulin antibody. To our knowledge, this is the first time that a protocol for protein extraction from olive leaf appears to give satisfactory and reproducible results. The protocol is expected to be applicable to other recalcitrant plant tissues and could be of interest to laboratories involved in plant proteomics.
authors.affiliation: Dipartimento di Scienze Ambientali, University of Siena, Siena, Italy. mails_wang@yahoo.com
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Monica
authors.initials: M
authors.lastname: Scali
authors.forename: Rita
authors.initials: R
authors.lastname: Vignani
authors.forename: Antonia
authors.initials: A
authors.lastname: Spadafora
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Sensi
authors.forename: Silvia
authors.initials: S
authors.lastname: Mazzuca
authors.forename: Mauro
authors.initials: M
authors.lastname: Cresti
mesh_terms: D005591:Chemical Fractionation / Q000379:methods; D015180:Electrophoresis, Gel, Two-Dimensional / Q000379:methods* / Q000592:standards; D015151:Immunoblotting; D031658:Olea / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry*; D011506:Proteins / Q000302:isolation & purification*; D040901:Proteomics / Q000379:methods*; D012997:Solvents
chemical_list: D010936:Plant Extracts; D011506:Proteins; D012997:Solvents