Abstract
Using a combination of two-dimensional gel electrophoresis protein mapping and mass spectrometry analysis, we have established proteome reference maps of embryogenic cell suspensions of cowpea (Vigna unguiculata). The cell suspensions were generated from young primary leaves and contained basically pro-embryogenic masses, which enabled us to dissect their proteome composition while eliminating the complexity of too many cell types. Over 550 proteins could reproducibly be resolved over a pI range of 3–10. A total of 128 of the most abundant protein spots were excised, digested in-gel with trypsin and analyzed by tandem mass spectrometry. This enabled the identification of 67 protein spots. Two of the most abundant proteins were identified as a chitinase and as a ribonuclease belonging to the family of PR-4 and PR-10 proteins, respectively. The expression of the respective genes was confirmed by RT-PCR and the pattern of deposition of the PR-10 protein in cell suspensions as well as in developing cowpea seeds, roots, shoots and flowers were determined by Western blot experiments, using synthetic antibodies raised against a 14-amino acid synthetic peptide located close to the C-terminal region of the PR-10 protein.
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Abbreviations
- FEC:
-
Friable embryogenic calli
- ECS:
-
Embryogenic cell suspension
- PR:
-
Pathogenesis related
- 2,4-d :
-
2,4-Dichlorophenoxyacetic acid
- 2-DE:
-
Two-dimensional electrophoresis
- MALDI-TOF-TOF-MS/MS:
-
Matrix assisted laser desorption ionization-time of flight-tandem mass spectrometry
- EST:
-
Expressed sequence tag
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Communicated by P. Lakshmanan.
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Nogueira, F.C.S., Gonçalves, E.F., Jereissati, E.S. et al. Proteome analysis of embryogenic cell suspensions of cowpea (Vigna unguiculata). Plant Cell Rep 26, 1333–1343 (2007). https://doi.org/10.1007/s00299-007-0327-6
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DOI: https://doi.org/10.1007/s00299-007-0327-6