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TandeMBP: generation of a unique protein substrate for protein kinase assays.

J. Biochem.2014 Sep;156(3):147-54. Epub 2014 Apr 08
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摘要


Myelin basic protein (MBP) is one of the major components of central nervous system myelin and has multiple sites for protein phosphorylation. Therefore, it has been widely used as a substrate for in vitro assays of various protein kinases. In this study, to obtain more efficient substrates for protein kinase assays than commercially available MBP from bovine brain, we produced various recombinant MBPs using Escherichia coli expression systems. Three splice isoforms of mouse MBP were expressed in E. coli and successfully purified using a new protocol consisting of HCl extraction, urea treatment and affinity purification with HiTrap Chelating HP column. The recombinant MBP isoforms thus obtained served as more efficient substrates for protein kinases than MBP isolated from bovine brain. To generate an even better substrate for protein kinase assays, we produced a hybrid protein composed of two different MBP isoforms connected in tandem, designated TandeMBP. TandeMBP was readily expressed in E. coli and could be purified by the newly developed simple procedure. TandeMBP was phosphorylated by various Ser/Thr protein kinases more efficiently than the other MBP isoforms. Taken together, TandeMBP will become a powerful tool for in vitro assays to analyse various protein kinase activities.

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