research highlights POLLEN Science 360, 533–536 (2018) channels. A few of them could regulate calcium homeostasis in pollen by redirecting the ion away from the cytosol and into intracellular reservoirs, which implies specific subcellular localizations. Using analogy with animal systems, the authors focused on the CORNICHON (CNIH) family of proteins needed for trafficking of GLRs in vertebrates. Indeed, in a double cnih mutant, GLRs — but not other similarly targeted proteins, indicating some specificity — are not correctly sorted and end up trapped in the endomembrane Credit: Heiti Paves / Alamy Stock Photo network. Furthermore, the presence of CNIH proteins increases the GLR ion Glutamate is an important neurotransmitter channel activity, even without its ligand, in in vertebrates. Its perception across synapses electrophysiology assays. is mediated by transmembrane receptors. This study shows that understanding Plants also contain glutamate receptor-like biological functions is a fascinating never- (GLR) proteins, which function as non- ending game of molecular Russian nesting specific channels with calcium permeability dolls, with many layers of complexity adding and have been involved in many biological on top of each other: calcium is a necessary processes, from immunity to metabolism. signal for pollination, GLRs modulate José Feijó and colleagues have identified calcium fluxes, CNIH controls GLR molecular partners that are needed for localization and activity. Now may be proper function and subcellular localization the time to address how CNIH proteins of GLRs during pollen tube growth. are regulated. Arabidopsis contains 20 GLRs. A close Guillaume Tena inspection of individual and higher- order mutants for pollen-expressed GLRs suggested that their role is more complex Published online: 4 June 2018 than simple plasma membrane calcium https://doi.org/10.1038/s41477-018-0184-z NaturE PLaNts | VOL 4 | JUNE 2018 | 318 | www.nature.com/natureplants © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
Nature Plants – Springer Journals
Published: Jun 4, 2018
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