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A photolabile arylazido analogue of Ins(1,3,4,5)P4 selectively substituted at the 1-phosphate group was synthesized by coupling 2-aminoethanol(1)-1-phospho-D-myo-inositol 4,5-bisphosphate with N-hydroxysuccinimidyl-4-azidosalicylic acid [Schäfer, Nehls-Sahabandu, Grabowsky, Dehlinger-Kremer, Schulz &amp; Mayr (1990) Biochem. J. 272, 817-825] and subsequently phosphorylating the product by bovine brain Ins(1,4,5)P3 3-kinase. The product, N-(4-azidosalicyl)-aminoethanol(1)-1-phospho-D-myo-inositol 3,4,5-trisphosphate [AsaIns(1,3,4,5)P4] was radioiodinated and purified by anion-exchange chromatography. AsaIns(1,3,4,5)P4 bound to a high-affinity Ins(1,3,4,5)P4 receptor from pig cerebellum with an affinity only 3-fold lower than that of Ins(1,3,4,5)P4. Photoirradiation of 125I-AsaIns(1,3,4,5)P4 in the presence of the receptor preparation revealed that the radioactive label was specifically associated with a protein band of apparent molecular mass 42 kDa, which Donié &amp; Reiser [(1991) Biochem. J. 275, 453-457] had previously tentatively assigned to the Ins(1,3,4,5)P4 receptor protein. The radioactive label was displaced from the receptor when the binding reaction with 125I-AsaIns(1,3,4,5)P4 was carried out in the presence of 5 microM-Ins(1,3,4,5)P4.

biochemical journal

A high-affinity inositol 1,3,4,5-tetrakisphosphate receptor protein from brain is specifically labelled by a newly synthesized photoaffinity analogue, <i>N</i>-(4-azidosalicyl)aminoethanol(1)-1-phospho-<scp>d</scp>-<i>myo</i>-inositol 3,4,5-trisphosphate

A high-affinity inositol 1,3,4,5-tetrakisphosphate receptor protein from brain is specifically labelled by a newly synthesized photoaffinity analogue, N-(4-azidosalicyl)aminoethanol(1)-1-phospho-d-myo-inositol 3,4,5-trisphosphate