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A general method for the extraction of citrus leaf proteins and separation by 2D electrophoresis : A follow up

Maserti B.E., Della Croce C.M., Luro F., Morillon R., Cini M., Caltavuturo L.. 2007. Journal of Chromatography. B, 849 (1-2) : p. 351-356.

DOI: 10.1016/j.jchromb.2006.09.025

With the aim of studying differentially expressed proteins as a function of abiotic and biotic stress in citrus plants, we optimized a protocol for the extraction of total leaf proteins and their 2-DE separation using commercially available immobilized pH gradient strips (IPGs) in the first dimension. Critical factors for good reproducibility of citrus leaf protein separation were identified: trichloroacetic acid (TCA)/acetone precipitation after extraction in lysis buffer, sample fractionation on narrow range overlapping IPGs and sample-cup loading at the anodic or cathodic end of the strip. The use of thiourea and a strong detergent (C7BzO) in the solubilization/rehydration buffer, coupled with the increase to 10% of SDS in the equilibration buffer before the second dimension seemed to affect positively the resolution of basic proteins. Using our protocol we resolved about 30 basic proteins on 6.3-8.3 pH range strips. Further, our protocol was successfully applied reproducibly on the analysis of control and salt exposed leaf samples of Citrus reshni Hort. Ex Tan. © 2006 Elsevier B.V. All rights reserved.

Mots-clés : citrus; protéine; extraction; séparation; Électrophorèse; ph

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