Heterotrimeric G-proteins in green algae. An early innovation in the evolution of the plant lineage

Plant Signaling & Behavior
Dieter Hackenberg, Sona Pandey

Abstract

Heterotrimeric G-proteins (G-proteins, hereafter) are important signaling components in all eukaryotes. The absence of these proteins in the sequenced genomes of Chlorophycean green algae has raised questions about their evolutionary origin and prevalence in the plant lineage. The existence of G-proteins has often been correlated with the acquisition of embryophytic life-cycle and/or terrestrial habitats of plants which occurred around 450 million years ago. Our discovery of functional G-proteins in Chara braunii, a representative of the Charophycean green algae, establishes the existence of this conserved signaling pathway in the most basal plants and dates it even further back to 1-1.5 billion years ago. We have now identified the sequence homologs of G-proteins in additional algal families and propose that green algae represent a model system for one of the most basal forms of G-protein signaling known to exist to date. Given the possible differences that exist between plant and metazoan G-protein signaling mechanisms, such basal organisms will serve as important resources to trace the evolutionary origin of proposed mechanistic differences between the systems as well as their plant-specific functions.

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Citations

Jan 15, 2015·Plant Biotechnology Journal·Jannatul FerdousBu-Jun Shi
Mar 26, 2015·Plant Science : an International Journal of Experimental Plant Biology·Rafael A Romero-CastilloSona Pandey
Apr 29, 2016·Plant Signaling & Behavior·Sona Pandey
Dec 23, 2016·Journal of Experimental Botany·Guan-Zhu Han
May 1, 2019·Annual Review of Plant Biology·Sona Pandey
Sep 15, 2018·Communicative & Integrative Biology·Sophie de VriesClaudio H Slamovits
Mar 28, 2018·Proceedings of the National Academy of Sciences of the United States of America·Jan de VriesJohn M Archibald
Apr 13, 2018·BMC Evolutionary Biology·A D LokitsP F Stadler
Sep 22, 2021·Annual Review of Genetics·James Umen, Matthew D Herron

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