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The plant-specific sucrose nonfermenting 1-related protein kinase 2 (SnRK2) family is considered an important regulator of plant responses to abiotic stresses such as drought, cold, salinity, and nutrition deficiency. However, little information is available on how SnRK2s regulate sulfur deprivation responses in Arabidopsis. Large-scale production of SnRK2 kinases  in vitro  can help to elucidate the biochemical properties and physiological functions of this protein family. However, heterogenous expression of SnRK2s usually leads to inactive proteins. In this study, we expressed a recombinant Arabidopsis SnRK2.1 in a modified  E. coli  cell-free system, which combined two kinds of extracts allowing for a convenient and affordable protein preparation. The recombinant SnRK2.1 was produced in large-scale and the autophosphorylation activity of purified SnRK2.1 was characterized, allowing for further biochemical and substrate binding analysis in sulfur signaling. The application of this improved  E. coli  cell-free system provides us a promising and convenient platform to enhance expression of the target proteins economically.

biomed research international

Expression, Purification, and Characterization of a Sucrose Nonfermenting 1-Related Protein Kinases 2 of<i> Arabidopsis thaliana</i> in<i> E. coli</i>-Based Cell-Free System

Expression, Purification, and Characterization of a Sucrose Nonfermenting 1-Related Protein Kinases 2 of Arabidopsis thaliana in E. coli-Based Cell-Free System