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A role for the RabA4b effector protein PI-4Kβ1 in polarized expansion of root hair cells in Arabidopsis thaliana

Journal Article · · Journal of Cell Biology
 [1];  [2];  [3];  [4];  [5];  [3]
  1. Donald Danforth Plant Science Center, St. Louis, MO (United States); DOE/OSTI
  2. Michigan State Univ., East Lansing, MI (United States). Dept. of Plant Biology
  3. Donald Danforth Plant Science Center, St. Louis, MO (United States); Washington Univ., St. Louis, MO (United States). School of Medicine. Dept. of Biology
  4. Donald Danforth Plant Science Center, St. Louis, MO (United States)
  5. Univ. of Wisconsin, Madison, WI (United States). Dept. of Botany
The RabA4b GTPase labels a novel, trans-Golgi network compartment displaying a developmentally regulated polar distribution in growing Arabidopsis thaliana root hair cells. GTP bound RabA4b selectively recruits the plant phosphatidylinositol 4-OH kinase, PI-4Kβ1, but not members of other PI-4K families. PI-4Kβ1 colocalizes with RabA4b on tip-localized membranes in growing root hairs, and mutant plants in which both the PI-4Kβ1 and -4Kβ2 genes are disrupted display aberrant root hair morphologies. PI-4Kβ1 interacts with RabA4b through a novel homology domain, specific to eukaryotic type IIIβ PI-4Ks, and PI-4Kβ1 also interacts with a Ca2+ sensor, AtCBL1, through its NH2 terminus. We propose that RabA4b recruitment of PI-4Kβ1 results in Ca2+-dependent generation of PI-4P on this compartment, providing a link between Ca2+ and PI-4,5P2–dependent signals during the polarized secretion of cell wall components in tip-growing root hair cells.
Research Organization:
Donald Danforth Plant Science Center, St. Louis, MO (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); USDA; USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
FG02-03ER15412
OSTI ID:
1625136
Journal Information:
Journal of Cell Biology, Journal Name: Journal of Cell Biology Journal Issue: 7 Vol. 172; ISSN 0021-9525
Publisher:
Rockefeller University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Polar Expansion Dynamics in the Plant Kingdom: A Diverse and Multifunctional Journey on the Path to Pollen Tubes journal March 2013
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An auxin regulated positive feedback loop integrates Rho modulated cell polarity with pattern formation journal June 2010
EGG CELL 1 function and stability during double fertilization in Arabidopsis thaliana text January 2012
Regulation of cell polarity and double fertilization in Arabidopsis thaliana text January 2016
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Phosphoinositide Signaling in Root Hair Tip Growth book September 2014
Male functions and malfunctions: the impact of phosphoinositides on pollen development and pollen tube growth journal December 2015
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The song of lipids and proteins: dynamic lipid-protein interfaces in the regulation of plant cell polarity at different scales journal February 2015
Arabidopsis Type-III Phosphatidylinositol 4-Kinases β1 and β2 are Upstream of the Phospholipase C Pathway Triggered by Cold Exposure journal March 2012
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Cinderella story: PI4P goes from precursor to key signaling molecule journal October 2013
Arabidopsis TRAPPII is functionally linked to Rab-A, but not Rab-D in polar protein trafficking in trans -Golgi network journal November 2011

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