Proteomic profiling of tandem affinity purified 14-3-3 protein complexes in Arabidopsis thaliana.

In eukaryotes, 14-3-3 dimers regulate hundreds of functionally diverse proteins (clients), typically in phosphorylation-dependent interactions. To uncover new clients, 14-3-3 omega (At1g78300) from Arabidopsis was engineered with a "tandem affinity purification" tag and expressed in transgenic plants. Purified complexes were analyzed by tandem MS. Results indicate that 14-3-3 omega can ...
dimerize with at least 10 of the 12 14-3-3 isoforms expressed in Arabidopsis. The identification here of 121 putative clients provides support for in vivo 14-3-3 interactions with a diverse array of proteins, including those involved in: (i) Ion transport, such as a K(+) channel (GORK), a Cl(-) channel (CLCg), Ca(2+) channels belonging to the glutamate receptor family (1.2, 2.1, 2.9, 3.4, 3.7); (ii) hormone signaling, such as ACC synthase (isoforms ACS-6, -7 and -8 involved in ethylene synthesis) and the brassinolide receptors BRI1 and BAK1; (iii) transcription, such as 7 WRKY family transcription factors; (iv) metabolism, such as phosphoenol pyruvate carboxylase; and (v) lipid signaling, such as phospholipase D (beta and gamma). More than 80% (101) of these putative clients represent previously unidentified 14-3-3 interactors. These results raise the number of putative 14-3-3 clients identified in plants to over 300.
Mesh Terms:
14-3-3 Proteins, Amino Acid Motifs, Arabidopsis, Arabidopsis Proteins, Consensus Sequence, Electrophoresis, Gel, Two-Dimensional, Escherichia coli, Green Fluorescent Proteins, Plant Proteins, Plants, Genetically Modified, Protein Binding, Protein Interaction Mapping, Protein Isoforms, Proteomics, Recombinant Fusion Proteins, Signal Transduction, Tandem Mass Spectrometry
Proteomics
Date: Jun. 01, 2009
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