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정경태,Tae Ho Lee,Gyong Suk Kan 한국생물공학회 2003 Biotechnology and Bioprocess Engineering Vol.8 No.3
BiP, immunoglobulin binding protein, is an ER homologue of Hsp70. However, unlike other Hsp70 proteins, regulatory protein(s) for BiP has not been identified. Here, we demonstrated the presence of potential regulatory proteins for BiP using a pull-down assay. Since BiP can bind any unfolded protein, only the ATPase domain of BiP was used for the pull-down assay in order to minimize nonspecific binding. The ATPase domain was cloned to produce recombinant protein, which was then conjugated to CNBr-activated agarose. The structural conformation and ATP hydrolysis activity of the recombinant AT-Pase domain were similar to those of the native protein. Eight proteins from metabolically labeled mouse plasmacytoma cells specifically bound to the recombinant ATPase protein. The binding of these proteins was inhibited by excess amounts of free ATPase protein, and was dependent on the presence of ATP. These proteins were eluted by ADP. Of these proteins, Grp170 and BiP where identified, while the others were not identified as known ER proteins, from Western blot analyses. The presence of the ATPase-binding proteins for BiP was first demonstrated in this study, and our data suggest similar regulatory machinery for BiP may exist in the ER, as found in prokaryotes and other cellular compartments.
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