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Mol Plant. 2014 Jun;7(6):1026-1040. doi: 10.1093/mp/ssu019. Epub 2014 Feb 25.

Homotypic vacuole fusion requires VTI11 and is regulated by phosphoinositides.

Author information

1
Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC 27695, USA.
2
Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC 27695, USA. Electronic address: mrojasp@ncsu.edu.

Abstract

Most plant cells contain a large central vacuole that is essential to maintain cellular turgor. We report a new mutant allele of VTI11 that implicates the SNARE protein VTI11 in homotypic fusion of protein storage and lytic vacuoles. Fusion of the multiple vacuoles present in vti11 mutants could be induced by treatment with Wortmannin and LY294002, which are inhibitors of Phosphatidylinositol 3-Kinase (PI3K). We provide evidence that Phosphatidylinositol 3-Phosphate (PtdIns(3)P) regulates vacuole fusion in vti11 mutants, and that fusion of these vacuoles requires intact microtubules and actin filaments. Finally, we show that Wortmannin also induced the fusion of guard cell vacuoles in fava beans, where vacuoles are naturally fragmented after ABA-induced stomata closure. These results suggest a ubiquitous role of phosphoinositides in vacuole fusion, both during the development of the large central vacuole and during the dynamic vacuole remodeling that occurs as part of stomata movements.

KEYWORDS:

SNARE; Wortmannin.; membrane fusion; phosphoinositides; vacuole

PMID:
24569132
DOI:
10.1093/mp/ssu019
[Indexed for MEDLINE]
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