Ca2+ pulsation in BY-2 cells and evidence for control of mechanosensory Ca2+ -selective channels by the plasmalemmal reticulum

Functional Plant Biology : FPB
Barbara G Pickard, Masaaki Fujiki

Abstract

A previously unknown cytoskeletal structure, now named the plasmalemmal reticulum (Gens et al. 2000, Protoplasma 212, 115-134), was found in cultured BY-2 tobacco cells during a search for a force-focusing mechanism that might enhance signal transduction by the cells' mechanosensory Ca2+-selective cation channels (MCaCs). This polyhedral structure, which links cell wall, plasma membrane, and internal cytoplasm, prominently contains arabinogalactan protein (AGP). To check for reticulum-promoted Ca2+ elevation, the AGP-binding reagent (β-d-glucosyl)3 Yariv phenylglycoside has been applied to BY-2 cells expressing a free cameleon Ca2+ reporter. Ca2+ elevation was substantial and prolonged. Moreover it occurred in the nucleus as well as the cytoplasm. Cells treated with non-binding mannosyl Yariv reagent could not be discriminated from untreated controls or those treated with carrier solution alone. Supply of the MCaC inhibiter Gd3+ just before treatment with Yariv reagent prevented Ca2+ rise. These data strongly support the hypothesis that the plasmalemmal reticulum controls MCaC activity. The massive inward spread of Ca2+ suggested that entry of the ion through the channels initiated a wave of release from the ER, and YCX in the ...Continue Reading

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Citations

Nov 28, 2012·The New Phytologist·Barbara G Pickard
Jan 15, 2013·The Plant Journal : for Cell and Molecular Biology·Peter Nick
Jan 5, 2007·Annual Review of Plant Biology·Georg J Seifert, Keith Roberts
Aug 4, 2007·The Plant Journal : for Cell and Molecular Biology·Eric Nguema-OnaAzeddine Driouich
Dec 4, 2014·Journal of Experimental Botany·Marek MarzecMichael Melzer
Dec 1, 2008·American Journal of Botany·Azeddine Driouich, Tobias I Baskin
Apr 16, 2021·Plant Signaling & Behavior·František BaluškaElizabeth Van Volkenburgh
Feb 16, 2010·Plant Physiology·Georg J Seifert, Claudia Blaukopf

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transgenically
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