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An Auxin-Mediated Control of a Rapid Phosphoinositide Response in Isolated Plant Cell Membranes

  • B. Zbell

Abstract

In many types of animal cells the so-called phosphoinositide (PI) response is involved in the signal transduction of light, hormones or neurotransmitters [1], Extracellular signals are percepted by their specific receptors at the outside of the plasma membrane, and these informations are transduced across the membrane by the operation of high-affinity GTP-binding proteins (G proteins) [2]. The activated G proteins stimulate obviously the phosphoinositidase C on the cytoplasmic side of the plasma membrane, which hydrolyzes membrane-bound phosphatidyl (4,5) bisphosphate (PIP2) to membrane-bound diacylglycerol and soluble inositol (1,4,5) trisphosphate (IP3) [1]. The compounds act as second messengers for the stimulation of the protein kinase C and the release of Ca2+ from endomembrane stores, respectively [1,3]. The protein phosphorylation and the Ca2+ mobilization are suggested to cooperate as persistent and transient signals for the control of cellular processes, respectively [3]. The PI response is discussed now also for plants, since phosphatidylinositol (4) monophosphate (PIP) and PIP2 as lipids [4], their specific lipid kinases [5] as well as the phosphoinositidase C [6] were found to be localized at the plasma membrane, and high-affinity GTP binding proteins of as yet unknown function [7,8] were detected on membranes of plant cells. The phytohormone auxin was found to function as one putative signal for the initiation of the PI response in plants [8,9,10,11]. This report summarizes briefly some important aspects concerning the auxin action on microsomal membranes prepared from carrot suspension cells.

Keywords

Phosphatidic Acid Phosphatidic Acid Microsomal Membrane Inositol Trisphosphate Auxin Action 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Akadémiai Kiadó, Budapest 1989

Authors and Affiliations

  • B. Zbell
    • 1
  1. 1.Botanical InstituteRuprecht-Karls-UniversityHeidelbergGermany

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