155135 - The evolution of plant proton pump regulation.pdf (5.94 MB)
The evolution of plant proton pump regulation via the R domain may have facilitated plant terrestrialization
journal contributionposted on 2023-05-21, 16:05 authored by Steger, A, Hayashi, M, Lauritzen, EW, Herburger, K, Svetlana ShabalaSvetlana Shabala, Wang, C, Bendtsen, AK, Norrevang, AF, Madriz-Ordenana, K, Ren, S, Trinh, MDL, Thordal Christensen, H, Fuglsang, AT, Sergey ShabalaSergey Shabala, Osterberg, JT, Palmgren, M
Plasma membrane (PM) H+-ATPases are the electrogenic proton pumps that export H+ from plant and fungal cells to acidify the surroundings and generate a membrane potential. Plant PM H+-ATPases are equipped with a C‑terminal autoinhibitory regulatory (R) domain of about 100 amino acid residues, which could not be identified in the PM H+-ATPases of green algae but appeared fully developed in immediate streptophyte algal predecessors of land plants. To explore the physiological significance of this domain, we created in vivo C-terminal truncations of autoinhibited PM H+‑ATPase2 (AHA2), one of the two major isoforms in the land plant Arabidopsis thaliana. As more residues were deleted, the mutant plants became progressively more efficient in proton extrusion, concomitant with increased expansion growth and nutrient uptake. However, as the hyperactivated AHA2 also contributed to stomatal pore opening, which provides an exit pathway for water and an entrance pathway for pests, the mutant plants were more susceptible to biotic and abiotic stresses, pathogen invasion and water loss, respectively. Taken together, our results demonstrate that pump regulation through the R domain is crucial for land plant fitness and by controlling growth and nutrient uptake might have been necessary already for the successful water-to-land transition of plants.
Publication titleCommunications Biology
Department/SchoolTasmanian Institute of Agriculture (TIA)
PublisherNature Publishing Group
Place of publicationUnited Kingdom
Rights statement© The Author(s) 2022. This article is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License, https://creativecommons.org/licenses/by/4.0/ which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, and indicate if changes were made.