A molecular framework for coupling cellular volume and osmotic solute transport control

Eukaryotic cells expand using vesicle traffic to increase membrane surface area. Expansion in walled eukaryotes is driven by turgor pressure which depends fundamentally on the uptake and accumulation of inorganic ions. Thus, ion uptake and vesicle traffic must be controlled coordinately for growth....

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Bibliographic Details
Published in:Journal of experimental botany 2011-04, Vol.62 (7), p.2363-2370
Main Authors: Honsbein, Annegret, Blatt, Michael R., Grefen, Christopher
Format: Article
Language:English
Subjects:
Arabidopsis - cytology
Arabidopsis - genetics
Arabidopsis - metabolism
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Biological Transport
Biology
Cell membranes
Cell Size
Guard cells
Ion transport
Ions - metabolism
OPINION PAPER
Osmosis
Plants
Proteins
SNARE proteins
Surface areas
Yeasts
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Summary:Eukaryotic cells expand using vesicle traffic to increase membrane surface area. Expansion in walled eukaryotes is driven by turgor pressure which depends fundamentally on the uptake and accumulation of inorganic ions. Thus, ion uptake and vesicle traffic must be controlled coordinately for growth. How this coordination is achieved is still poorly understood, yet is so elemental to life that resolving the underlying mechanisms will have profound implications for our understanding of cell proliferation, development, and pathogenesis, and will find applications in addressing the mineral and water use by plants in the face of global environmental change. Recent discoveries of interactions between trafficking and ion transport proteins now open the door to an entirely new approach to understanding this coordination. Some of the advances to date in identifying key protein partners in the model plant Arabidopsis and in yeast at membranes vital for cell volume and turgor control are outlined here. Additionally, new evidence is provided of a wider participation among Arabidopsis Kv-like K + channels in selective interaction with the vesicle-trafficking protein SYP121. These advances suggest some common paradigms that will help guide further exploration of the underlying connection between ion transport and membrane traffic and should transform our understanding of cellular homeostasis in eukaryotes.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/erq386