Adenylate cyclase activity of TIR1/AFB auxin receptors in plants
Qi L, Kwiatkowski M, Chen H, Hörmayer L, Sinclair SA, Zou M, del Genio CI, Kubeš MF, Napier R, Jaworski K, Friml J. 2022. Adenylate cyclase activity of TIR1/AFB auxin receptors in plants. Nature. 611(7934), 133–138.
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Author
Qi, LinlinISTA 
;
Kwiatkowski, Mateusz;
Chen, HuihuangISTA;
Hörmayer, LukasISTA ;
Sinclair, Scott AISTA ;
Zou, MinxiaISTA;
del Genio, Charo I.;
Kubeš, Martin F.;
Napier, Richard;
Jaworski, Krzysztof;
Friml, JiríISTA
;
Kwiatkowski, Mateusz;
Chen, HuihuangISTA;
Hörmayer, LukasISTA ;
Sinclair, Scott AISTA ;
Zou, MinxiaISTA;
del Genio, Charo I.;
Kubeš, Martin F.;
Napier, Richard;
Jaworski, Krzysztof;
Friml, JiríISTA Corresponding author has ISTA affiliation
Department
Abstract
The phytohormone auxin is the major coordinative signal in plant development1, mediating transcriptional reprogramming by a well-established canonical signalling pathway. TRANSPORT INHIBITOR RESPONSE 1 (TIR1)/AUXIN-SIGNALING F-BOX (AFB) auxin receptors are F-box subunits of ubiquitin ligase complexes. In response to auxin, they associate with Aux/IAA transcriptional repressors and target them for degradation via ubiquitination2,3. Here we identify adenylate cyclase (AC) activity as an additional function of TIR1/AFB receptors across land plants. Auxin, together with Aux/IAAs, stimulates cAMP production. Three separate mutations in the AC motif of the TIR1 C-terminal region, all of which abolish the AC activity, each render TIR1 ineffective in mediating gravitropism and sustained auxin-induced root growth inhibition, and also affect auxin-induced transcriptional regulation. These results highlight the importance of TIR1/AFB AC activity in canonical auxin signalling. They also identify a unique phytohormone receptor cassette combining F-box and AC motifs, and the role of cAMP as a second messenger in plants.
Publishing Year
Date Published
2022-11-03
Journal Title
Nature
Publisher
Springer Nature
Acknowledgement
This research was supported by the Lab Support Facility (LSF) and the Imaging and Optics Facility (IOF) of IST Austria. We thank C. Gehring for suggestions and advice; and K. U. Torii and G. Stacey for seeds and plasmids. This project was funded by a European Research Council Advanced Grant (ETAP-742985). M.F.K. and R.N. acknowledge the support of the EU MSCA-IF project CrysPINs (792329). M.K. was supported by the project POWR.03.05.00-00-Z302/17 Universitas Copernicana Thoruniensis in Futuro–IDS “Academia Copernicana”. CIDG acknowledges support from UKRI under Future Leaders Fellowship grant number MR/T020652/1.
Acknowledged SSUs
Volume
611
Issue
7934
Page
133-138
ISSN
eISSN
IST-REx-ID
Cite this
Qi L, Kwiatkowski M, Chen H, et al. Adenylate cyclase activity of TIR1/AFB auxin receptors in plants. Nature. 2022;611(7934):133-138. doi:10.1038/s41586-022-05369-7
Qi, L., Kwiatkowski, M., Chen, H., Hörmayer, L., Sinclair, S. A., Zou, M., … Friml, J. (2022). Adenylate cyclase activity of TIR1/AFB auxin receptors in plants. Nature. Springer Nature. https://doi.org/10.1038/s41586-022-05369-7
Qi, Linlin, Mateusz Kwiatkowski, Huihuang Chen, Lukas Hörmayer, Scott A Sinclair, Minxia Zou, Charo I. del Genio, et al. “Adenylate Cyclase Activity of TIR1/AFB Auxin Receptors in Plants.” Nature. Springer Nature, 2022. https://doi.org/10.1038/s41586-022-05369-7.
L. Qi et al., “Adenylate cyclase activity of TIR1/AFB auxin receptors in plants,” Nature, vol. 611, no. 7934. Springer Nature, pp. 133–138, 2022.
Qi L, Kwiatkowski M, Chen H, Hörmayer L, Sinclair SA, Zou M, del Genio CI, Kubeš MF, Napier R, Jaworski K, Friml J. 2022. Adenylate cyclase activity of TIR1/AFB auxin receptors in plants. Nature. 611(7934), 133–138.
Qi, Linlin, et al. “Adenylate Cyclase Activity of TIR1/AFB Auxin Receptors in Plants.” Nature, vol. 611, no. 7934, Springer Nature, 2022, pp. 133–38, doi:10.1038/s41586-022-05369-7.
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