Inositol phospholipids activate plasma membrane ATPase in plants.
Phosphatidylinositol-4-monophosphate and phosphatidylinositol-4,5-bisphosphate increased the activity of the vanadate-sensitive ATPase associated with plasma membranes isolated from both sunflower hypocotyls and carrot suspension culture cells. The response was not due to the metabolism of the polyphosphoinositides since diacylglycerol, inositol-1,4-bisphosphate, inositol-1,4,5-trisphosphate, glycerophosphoinositol monophosphate and glycerophosphoinositol bisphosphate had no effect. These data suggest that activation of the inositol phospholipid kinases could be a critical step in signal transduction in plants.
Memon
A R
AR
Department of Biology, Middle East Technical University, Ankara, Turkey.
Chen
Q Y
QY
Boss
W F
WF
D019870:1-Phosphatidylinositol 4-Kinase; D000251:Adenosine Triphosphatases / Q000378:metabolism*; D002462:Cell Membrane / Q000201:enzymology; D004789:Enzyme Activation / Q000187:drug effects; D007295:Inositol Phosphates / Q000494:pharmacology; D010716:Phosphatidylinositols / Q000494:pharmacology*; D010770:Phosphotransferases / Q000378:metabolism; D010944:Plants / Q000201:enzymology*
D007295:Inositol Phosphates; D010716:Phosphatidylinositols; D010770:Phosphotransferases; D019870:1-Phosphatidylinositol 4-Kinase; D000251:Adenosine Triphosphatases