---
_id: '13212'
abstract:
- lang: eng
text: Auxin is the major plant hormone regulating growth and development (Friml,
2022). Forward genetic approaches in the model plant Arabidopsis thaliana have
identified major components of auxin signalling and established the canonical
mechanism mediating transcriptional and thus developmental reprogramming. In this
textbook view, TRANSPORT INHIBITOR RESPONSE 1 (TIR1)/AUXIN-SIGNALING F-BOX (AFBs)
are auxin receptors, which act as F-box subunits determining the substrate specificity
of the Skp1-Cullin1-F box protein (SCF) type E3 ubiquitin ligase complex. Auxin
acts as a “molecular glue” increasing the affinity between TIR1/AFBs and the Aux/IAA
repressors. Subsequently, Aux/IAAs are ubiquitinated and degraded, thus releasing
auxin transcription factors from their repression making them free to mediate
transcription of auxin response genes (Yu et al., 2022). Nonetheless, accumulating
evidence suggests existence of rapid, non-transcriptional responses downstream
of TIR1/AFBs such as auxin-induced cytosolic calcium (Ca2+) transients, plasma
membrane depolarization and apoplast alkalinisation, all converging on the process
of root growth inhibition and root gravitropism (Li et al., 2022). Particularly,
these rapid responses are mostly contributed by predominantly cytosolic AFB1,
while the long-term growth responses are mediated by mainly nuclear TIR1 and AFB2-AFB5
(Li et al., 2021; Prigge et al., 2020; Serre et al., 2021). How AFB1 conducts
auxin-triggered rapid responses and how it is different from TIR1 and AFB2-AFB5
remains elusive. Here, we compare the roles of TIR1 and AFB1 in transcriptional
and rapid responses by modulating their subcellular localization in Arabidopsis
and by testing their ability to mediate transcriptional responses when part of
the minimal auxin circuit reconstituted in yeast.
acknowledged_ssus:
- _id: LifeSc
- _id: Bio
acknowledgement: We thank all the authors for sharing the published materials. This
research was supported by the Lab Support Facility and the Imaging and Optics Facility
of ISTA. We thank Lukáš Fiedler (ISTA) for critical reading of the manuscript. This
project was funded by the European Research Council Advanced Grant (ETAP-742985).
article_processing_charge: Yes (via OA deal)
article_type: letter_note
author:
- first_name: Huihuang
full_name: Chen, Huihuang
id: 83c96512-15b2-11ec-abd3-b7eede36184f
last_name: Chen
- first_name: Lanxin
full_name: Li, Lanxin
id: 367EF8FA-F248-11E8-B48F-1D18A9856A87
last_name: Li
orcid: 0000-0002-5607-272X
- first_name: Minxia
full_name: Zou, Minxia
id: 5c243f41-03f3-11ec-841c-96faf48a7ef9
last_name: Zou
- first_name: Linlin
full_name: Qi, Linlin
id: 44B04502-A9ED-11E9-B6FC-583AE6697425
last_name: Qi
orcid: 0000-0001-5187-8401
- first_name: Jiří
full_name: Friml, Jiří
id: 4159519E-F248-11E8-B48F-1D18A9856A87
last_name: Friml
orcid: 0000-0002-8302-7596
citation:
ama: Chen H, Li L, Zou M, Qi L, Friml J. Distinct functions of TIR1 and AFB1 receptors
in auxin signalling. Molecular Plant. 2023;16(7):1117-1119. doi:10.1016/j.molp.2023.06.007
apa: Chen, H., Li, L., Zou, M., Qi, L., & Friml, J. (2023). Distinct functions
of TIR1 and AFB1 receptors in auxin signalling. Molecular Plant. Elsevier
. https://doi.org/10.1016/j.molp.2023.06.007
chicago: Chen, Huihuang, Lanxin Li, Minxia Zou, Linlin Qi, and Jiří Friml. “Distinct
Functions of TIR1 and AFB1 Receptors in Auxin Signalling.” Molecular Plant.
Elsevier , 2023. https://doi.org/10.1016/j.molp.2023.06.007.
ieee: H. Chen, L. Li, M. Zou, L. Qi, and J. Friml, “Distinct functions of TIR1 and
AFB1 receptors in auxin signalling.,” Molecular Plant, vol. 16, no. 7.
Elsevier , pp. 1117–1119, 2023.
ista: Chen H, Li L, Zou M, Qi L, Friml J. 2023. Distinct functions of TIR1 and AFB1
receptors in auxin signalling. Molecular Plant. 16(7), 1117–1119.
mla: Chen, Huihuang, et al. “Distinct Functions of TIR1 and AFB1 Receptors in Auxin
Signalling.” Molecular Plant, vol. 16, no. 7, Elsevier , 2023, pp. 1117–19,
doi:10.1016/j.molp.2023.06.007.
short: H. Chen, L. Li, M. Zou, L. Qi, J. Friml, Molecular Plant 16 (2023) 1117–1119.
date_created: 2023-07-12T07:32:46Z
date_published: 2023-07-01T00:00:00Z
date_updated: 2024-01-29T10:38:57Z
day: '01'
ddc:
- '580'
department:
- _id: JiFr
doi: 10.1016/j.molp.2023.06.007
ec_funded: 1
external_id:
isi:
- '001044410900001'
pmid:
- '37393433'
file:
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checksum: 6012b7e4a2f680ee6c1f84001e2b945f
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creator: dernst
date_created: 2024-01-29T10:37:05Z
date_updated: 2024-01-29T10:37:05Z
file_id: '14894'
file_name: 2023_MolecularPlant_Chen.pdf
file_size: 1000871
relation: main_file
success: 1
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has_accepted_license: '1'
intvolume: ' 16'
isi: 1
issue: '7'
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc-nd/4.0/
month: '07'
oa: 1
oa_version: Published Version
page: 1117-1119
pmid: 1
project:
- _id: 261099A6-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '742985'
name: Tracing Evolution of Auxin Transport and Polarity in Plants
publication: Molecular Plant
publication_identifier:
eissn:
- 1674-2052
issn:
- 1752-9867
publication_status: published
publisher: 'Elsevier '
quality_controlled: '1'
scopus_import: '1'
status: public
title: Distinct functions of TIR1 and AFB1 receptors in auxin signalling.
tmp:
image: /images/cc_by_nc_nd.png
legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
(CC BY-NC-ND 4.0)
short: CC BY-NC-ND (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 16
year: '2023'
...