Wang, Bangjun; Bailly, Aurélien; Zwiewk, Marta; Henrichs, Sina; Azzarello, Elisa; Mancuso, Stefano; Maeshima, Masayoshi; Friml, JiríIST Austria ; Schulz, Alexander; Geisler, Markus
Plant architecture is influenced by the polar, cell-to-cell transport of auxin that is primarily provided and regulated by plasma membrane efflux catalysts of the PIN-FORMED and B family of ABC transporter (ABCB) classes. The latter were shown to require the functionality of the FK506 binding protein42 TWISTED DWARF1 (TWD1), although underlying mechanisms are unclear. By genetic manipulation of TWD1 expression, we show here that TWD1 affects shootward root auxin reflux and, thus, downstream developmental traits, such as epidermal twisting and gravitropism of the root. Using immunological assays, we demonstrate a predominant lateral, mainly outward-facing, plasma membrane location for TWD1 in the root epidermis characterized by the lateral marker ABC transporter G36/PLEIOTROPIC DRUG-RESISTANCE8/PENETRATION3. At these epidermal plasma membrane domains, TWD1 colocalizes with nonpolar ABCB1. In planta bioluminescence resonance energy transfer analysis was used to verify specific ABC transporter B1 (ABCB1)-TWD1 interaction. Our data support a model in which TWD1 promotes lateral ABCB-mediated auxin efflux via protein-protein interaction at the plasma membrane, minimizing reflux from the root apoplast into the cytoplasm.
We would thank Vincent Vincenzetti and Laurence Charrier for excellent technical assistance, A. von Arnim for the donation of BRET vectors, E. Spalding for TWD1-CFP, TWD1-CFP/29-1-GFP/ER-YFP, and ABCB4-GFP lines, M. Palmgren for discussion and support, and E. Martinoia for TT12 cDNA, support, and mentorship. Imaging data were partially collected at the Center for Advanced Bioimaging, University of Copenhagen, Denmark. This work was supported by grants from the Novartis Foundation (to M.G.), from the Danish Research School for Biotechnology (to M.G. and A.S.), from the Forschungskredit of the University of Zurich (to A.B.), from the Pool de Recherche of the University of Fribourg (to M.G.), and from the Swiss National Funds (to M.G.). M.G. dedicates this work to his father, who passed away during the resubmission process.
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Wang B, Bailly A, Zwiewk M, et al. Arabidopsis TWISTED DWARF1 functionally interacts with auxin exporter ABCB1 on the root plasma membrane. Plant Cell. 2013;25(1):202-214. doi:10.1105/tpc.112.105999
Wang, B., Bailly, A., Zwiewk, M., Henrichs, S., Azzarello, E., Mancuso, S., … Geisler, M. (2013). Arabidopsis TWISTED DWARF1 functionally interacts with auxin exporter ABCB1 on the root plasma membrane. Plant Cell. American Society of Plant Biologists. https://doi.org/10.1105/tpc.112.105999
Wang, Bangjun, Aurélien Bailly, Marta Zwiewk, Sina Henrichs, Elisa Azzarello, Stefano Mancuso, Masayoshi Maeshima, Jiří Friml, Alexander Schulz, and Markus Geisler. “Arabidopsis TWISTED DWARF1 Functionally Interacts with Auxin Exporter ABCB1 on the Root Plasma Membrane.” Plant Cell. American Society of Plant Biologists, 2013. https://doi.org/10.1105/tpc.112.105999.
B. Wang et al., “Arabidopsis TWISTED DWARF1 functionally interacts with auxin exporter ABCB1 on the root plasma membrane,” Plant Cell, vol. 25, no. 1. American Society of Plant Biologists, pp. 202–214, 2013.
Wang B, Bailly A, Zwiewk M, Henrichs S, Azzarello E, Mancuso S, Maeshima M, Friml J, Schulz A, Geisler M. 2013. Arabidopsis TWISTED DWARF1 functionally interacts with auxin exporter ABCB1 on the root plasma membrane. Plant Cell. 25(1), 202–214.
Wang, Bangjun, et al. “Arabidopsis TWISTED DWARF1 Functionally Interacts with Auxin Exporter ABCB1 on the Root Plasma Membrane.” Plant Cell, vol. 25, no. 1, American Society of Plant Biologists, 2013, pp. 202–14, doi:10.1105/tpc.112.105999.
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