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J Biol Chem, Vol. 273, Issue 29, 18040-18046, July 17, 1998
From the Inositol phospholipids regulate a variety of
cellular processes including proliferation, survival, vesicular
trafficking, and cytoskeletal organization. Recently, two novel
phosphoinositides, phosphatidylinositol-3,5-bisphosphate
(PtdIns-3,5-P2) and phosphatidylinositol- 5-phosphate
(PtdIns-5-P), have been shown to exist in cells.
PtdIns-3,5-P2, which is regulated by osmotic stress,
appears to be synthesized by phosphorylation of PtdIns-3-P at the D-5
position. No evidence yet exists for how PtdIns-5-P is produced in
cells. Understanding the regulation of synthesis of these molecules
will be important for identifying their function in cellular signaling.
To determine the pathway by which PtdIns-3,5-P2 and
Ptd-Ins-5-P might be synthesized, we tested the ability of the
recently cloned type I PtdIns-4-P 5-kinases (PIP5Ks)
Type I Phosphatidylinositol-4-phosphate 5-Kinases Synthesize the
Novel Lipids Phosphatidylinositol 3,5-Bisphosphate and
Phosphatidylinositol 5-Phosphate
§,
§,
,
,
§, and

Division of Signal Transduction,
Medicine,
Third Department of Internal Medicine,
University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan, and the
** Department of Medicinal Chemistry, University of Utah,
Salt Lake City, Utah 84112-5820
and
to
phosphorylate PtdIns-3-P and PtdIns at the D-5 position of the inositol
ring. We found that the type I PIP5Ks phosphorylate PtdIns-3-P to form
PtdIns-3,5-P2. The identity of the
PtdIns-3,5-P2 product was determined by anion exchange high
performance liquid chromatography analysis and periodate treatment.
PtdIns-3,4-P2 and PtdIns-3,4,5-P3 were also
produced from PtdIns-3-P phosphorylation by both isoforms. When
expressed in mammalian cells, PIP5K I
and PIP5K I
differed in
their ability to synthesize PtdIns-3,5-P2 relative to
PtdIns-3,4-P2. We also found that the type I PIP5Ks
phosphorylate PtdIns to produce PtdIns-5-P and phosphorylate
PtdIns-3,4-P2 to produce PtdIns-3,4,5-P3. Our findings suggest that type I PIP5Ks synthesize the novel phospholipids PtdIns-3,5-P2 and PtdIns-5-P. The ability of PIP5Ks to
produce multiple signaling molecules indicates that they may
participate in a variety of cellular processes.
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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