ABLs and TMKs are co-receptors for extracellular auxin
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AbstractExtracellular perception of auxin, an essential phytohormone in plants, has been debated for decades. Auxin binding protein 1 (ABP1) physically interacts with quintessential transmembrane kinases (TMKs) and was proposed to act as an extracellular auxin receptor, but its role was disputed because abp1 knockout mutants lack obvious morphological phenotypes. Here, we identified two new auxin-binding proteins, ABL1 and ABL2, that are localized to the apoplast and directly interact with the extracellular domain of TMKs in an auxin-dependent manner. Furthermore, functionally redundant ABL1 and ABL2 genetically interact with TMKs and exhibit functions that overlap with those of ABP1 as well as being independent of ABP1. Importantly, the extracellular domain of TMK1 itself binds auxin and synergizes with either ABP1 or ABL1 in auxin binding. Thus, our findings discovered auxin receptors ABL1 and ABL2 having functions overlapping with but distinct from ABP1 and acting together with TMKs as co-receptors for extracellular auxin.
All Author(s) ListYongqiang Yu , Wenxin Tang , Wenwei Lin , Wei Li , Xiang Zhou , Ying Li , Rong Chen , Rui Zheng , Guochen Qin , Wenhan Cao , Patricio Pérez-Henríquez , Rongfeng Huang , Jun Ma , Qiqi Qiu , Ziwei Xu , Ailing Zou , Juncheng Lin , Liwen Jiang , Tongda Xu , Zhenbiao Yang
Journal nameCell
Year2023
Month12
Volume Number186
Issue Number25
PublisherElsevier
Pages5457 - 5471.e17
ISSN0092-8674
eISSN1097-4172
LanguagesEnglish-United States

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