A mass spectrometric approach to identify arbuscular mycorrhiza-related proteins in root plasma membrane fractions

Proteomics
Benoît ValotEliane Dumas-Gaudot

Abstract

One of the most important morphological changes occurring in arbuscular mycorrhizal (AM) roots takes place when the plant plasma membrane (PM) invaginates around the fungal arbuscular structures resulting in the periarbuscular membrane formation. To investigate whether AM symbiosis-specific proteins accumulate at this stage, two complementary MS approaches targeting the root PM from the model legume Medicago truncatula were designed. Membrane extracts were first enriched in PM using a discontinuous sucrose gradient method. The resulting PM fractions were further analysed with (i) an automated 2-D LC-MS/MS using a strong cation exchange and RP chromatography, and (ii) SDS-PAGE combined with a systematic LC-MS/MS analysis. Seventy-eight proteins, including hydrophobic ones, were reproducibly identified in the PM fraction from non-inoculated roots, representing the first survey of the M. truncatula root PM proteome. Comparison between non-inoculated and Glomus intraradices-inoculated roots revealed two proteins that differed in the mycorrhizal root PM fraction. They corresponded to an H(+)-ATPase (Mtha1) and a predicted glycosylphosphatidylinositol-anchored blue copper-binding protein (MtBcp1), both potentially located on the peri...Continue Reading

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Citations

Dec 6, 2012·International Journal of Plant Genomics·Cosette AbdallahKjell Sergeant
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