Polar recruitment of RLD by LAZY1-like protein during gravity signaling in root branch angle control

Masahiko Furutani, Yoshinori Hirano, Takeshi Nishimura, Moritaka Nakamura, Masatoshi Taniguchi, Kanako Suzuki, Ryuichiro Oshida, Chiemi Kondo, Song Sun, Kagayaki Kato, Yoichiro Fukao, Toshio Hakoshima and Miyo Terao Morita ()
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Masahiko Furutani: Fujian Agriculture and Forestry University
Yoshinori Hirano: Nara Institute of Science and Technology
Takeshi Nishimura: National Institute for Basic Biology
Moritaka Nakamura: National Institute for Basic Biology
Masatoshi Taniguchi: Nagoya University
Kanako Suzuki: Nagoya University
Ryuichiro Oshida: Nagoya University
Chiemi Kondo: Nagoya University
Song Sun: Fujian Agriculture and Forestry University
Kagayaki Kato: National Institute for Basic Biology
Yoichiro Fukao: Ritsumeikan University
Toshio Hakoshima: Nara Institute of Science and Technology
Miyo Terao Morita: National Institute for Basic Biology

Nature Communications, 2020, vol. 11, issue 1, 1-13

Abstract: Abstract In many plant species, roots maintain specific growth angles relative to the direction of gravity, known as gravitropic set point angles (GSAs). These contribute to the efficient acquisition of water and nutrients. AtLAZY1/LAZY1-LIKE (LZY) genes are involved in GSA control by regulating auxin flow toward the direction of gravity in Arabidopsis. Here, we demonstrate that RCC1-like domain (RLD) proteins, identified as LZY interactors, are essential regulators of polar auxin transport. We show that interaction of the CCL domain of LZY with the BRX domain of RLD is important for the recruitment of RLD from the cytoplasm to the plasma membrane by LZY. A structural analysis reveals the mode of the interaction as an intermolecular β-sheet in addition to the structure of the BRX domain. Our results offer a molecular framework in which gravity signal first emerges as polarized LZY3 localization in gravity-sensing cells, followed by polar RLD1 localization and PIN3 relocalization to modulate auxin flow.

Date: 2020
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DOI: 10.1038/s41467-019-13729-7

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