Phosphorylation of
[3H]Ins(1,4,5)P3 and
[3H]Ins(1,3,4,5)P4 by mIPMK.
(A) HPLC analysis of assays containing 10 ng of mIPMK
incubated with
[3H]Ins(1,4,5)P3 for 0, 10,
30, or 120 min. (B) HPLC analysis of assays containing
10 ng of mIPMK incubated with
[3H]Ins(1,3,4,5)P4 for 0, 10,
30, or 120 min. The tritium HPLC standards used to identify the
products are: (a) Ins(1,4)P2; (b)
Ins(1,4,5)P3; (c)
Ins(1,3,4,5)P4; (d)
Ins(1,3,4,5,6)P5; (e)
PP-InsP4; (f)
InsP6. These data are representative of
three experiments.