Betzenhauser, M.J., Wagner, L.E. 2nd, Iwai, M., Michikawa, T., Mikoshiba, K. and Yule, D.I.
Notes: The authors examined the different ATP sensitivities of inositol (1,4,5)-triphosphate receptor (InsP3R) isoforms InsP3R1, InsP3R2 and InsP3R3. To compare the ATP-binding properties of InsP3R2 and InsP3R3, nucleotide sequences encompassing the ATP-binding domains were amplified by PCR and cloned into the pFN2A (GST) Flexi® Vector. The ATP-binding sites were expressed as glutathione-S-transferase (GST) fusion proteins in BL21(DE3)pLysS cells. Fusion proteins were purified, and the GST tag removed by cleavage with tobacco etch virus (TEV) protease. Purified proteins were then used in a fluorescent ATP-binding assay. (3901)