ArticleThe Plant cell2025
Novel repetitive elements in plant-specific tails of Gγ proteins as the functional unit in G-protein signaling in crops.
Article in The Plant cell, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Plant G proteins: Versatile signaling hubs for synergistic improvement of agronomic traits.Journal of integrative plant biology · 2026Review
- A leucine-rich-repeat receptor-like kinase SERL1 phosphorylates and stabilizes OsALDH2B1 to promote alkaline tolerance and grain size in rice.Journal of integrative plant biology · 2026Article
- Like white on rice: G proteins impact the Hippo pathway to regulate rice grain size.The Plant cell · 2026Article
- Focus on Translational Research from Arabidopsis to Crop Plants and Beyond.The Plant cell · 2025Article
- Using chimeric rice proteins to make heads or tails of the function of repetitive elements in Gγ subunits.The Plant cell · 2025Article
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Authors and funding
14 authors.
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Abstract
Heterotrimeric G-proteins act as molecular switches in signal transduction in response to stimuli in all eukaryotes. However, what specifies G-protein signaling in plants and how the mechanism evolved and diverged remain unsolved. Here, we found that the recently evolved tails of three Gγ subunits, Dense and erect panicle 1 (DEP1), G-protein gamma subunit 2 of type C (GGC2), and Grain size 3 (GS3), determine their distinct functions and specify grain size in rice (Oryza sativa L.). These Gγ subunits originated and expanded by an ancestral σ duplication ∼130 million years ago (mya) and a pancereal ρ duplication ∼70 mya in monocots, increasing genome complexity and inspiring functional innovations. In particular, through the comprehensive creation of artificial chimeric Gγ proteins, we found that this signaling selectivity is driven by repetitive elements and a link region hidden in plant-specific Gγ tails, allowing crops to switch from positive regulation to negative control. Unlike the tails, the conserved Gγ heads did not bias the signaling specificity; however, the change in the interaction between the mutated Gβ and Gγ affected the subsequent downstream signal transduction and grain size. Manipulating G-protein signaling also affects organ size in maize (Zea mays) and is expected to constitute a general mechanism for crop improvement. Collectively, these findings reveal that plant-specific Gγ tails drive signaling selectivity and serve as valuable targets for optimizing crop traits through G-protein manipulation.
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