PreprintCited by 112Plant Molecular Biology ResearchLight effects on plantsPlant nutrient uptake and metabolism

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ABLs and TMKs are co-receptors for extracellular auxin

Open access

Preprint — published as 10.1016/j.cell.2023.10.017

Abstract

SUMMARY: Extracellular 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 are overlapping with those of ABP1 as well as 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 new auxin receptors ABL1 and ABL2 having functions overlapping with but distinct from ABP1 and acting together with TMKs as co-receptors for extracellular auxin.

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Metadata

Authors
Yu, Y., Tang, W., Lin, W., Li, W., Zhou, X., Li, Y., Chen, R., Zheng, R., Qin, G., Cao, W., Perez, P., Huang, R., Ma, J., Lin, J., Jiang, L., Xu, T., & Yang, Z.
Affiliations
  • Chinese Academy of Sciences (CN)
  • Fujian Agriculture and Forestry University (CN)
  • Nanjing Agricultural University (CN)
  • Chinese University of Hong Kong (HK)
  • University of California, Riverside (US)
Corresponding author
  • Xu, Tongda
  • Yang, Zhenbiao
Venue
Cell
Publisher
openRxiv
Published
2022-11-28
Volume
186
Issue
25
Pages
5457-5471.e17
ISSN
0092-8674 (ISSN-L)
OpenAlex
W4388759124
Cited by
112
References
1
Citations by year
2026: 27 · 2025: 43 · 2024: 31 · 2023: 10 · 2022: 1
FWCI
17.44
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Cell (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Natural Science Foundation of China (32130010)
  • Chinese Academy of Sciences
  • Fujian Agriculture and Forestry University
  • National Institute of General Medical Sciences (R01GM100130, GM100130)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant nutrient uptake and metabolism
Keywords
auxin receptor, auxin-binding protein, c-Abl, ABL2, ABP1, co-receptors, apoplast, genetic interactions, plant hormone signaling
MeSH terms
Indoleacetic Acids, Plant Growth Regulators, Plant Proteins, Receptors, Cell Surface, Arabidopsis, Arabidopsis Proteins

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