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Detection of in vivo protein interactions between Snf1-related kinase subunits with intron-tagged epitope-labelling in plants cells.

Nucleic Acids Res.2001 Sep 01;29(17):3685-93. doi:10.1093/nar/29.17.3685
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摘要


Plant orthologs of the yeast sucrose non-fermenting (Snf1) kinase and mammalian AMP-activated protein kinase (AMPK) represent an emerging class of important regulators of metabolic and stress signalling. The catalytic alpha-subunits of plant Snf1-related kinases (SnRKs) interact in the yeast two-hybrid system with different proteins that share conserved domains with the beta- and gamma-subunits of Snf1 and AMPKs. However, due to the lack of a robust technique allowing the detection of protein interactions in plant cells, it is unknown whether these proteins indeed occur in SnRK complexes in vivo. Here we describe a double-labelling technique, using intron-tagged hemagglutinin (HA) and c-Myc epitope sequences, which provides a simple tool for co-immunopurification of interacting proteins expressed in Agrobacterium-transformed Arabidopsis cells. This generally applicable plant protein interaction assay was used to demonstrate that AKINbeta2, a plant ortholog of conserved Snf1/AMPK beta-subunits, forms different complexes with the catalytic alpha-subunits of Arabidopsis SnRK protein kinases AKIN10 and AKIN11 in vivo.

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