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
- Donald Danforth Plant Science Center, St. Louis, MO (United States); DOE/OSTI
- Michigan State Univ., East Lansing, MI (United States). Dept. of Plant Biology
- Donald Danforth Plant Science Center, St. Louis, MO (United States); Washington Univ., St. Louis, MO (United States). School of Medicine. Dept. of Biology
- Donald Danforth Plant Science Center, St. Louis, MO (United States)
- 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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