The lipid code-dependent phosphoswitch PDK1–D6PK activates PIN-mediated auxin efflux in Arabidopsis

S. Tan, X. Zhang, W. Kong, X.-L. Yang, G. Molnar, Z. Vondráková, R. Filepová, J. Petrášek, J. Friml, H.-W. Xue, Nature Plants 6 (2020) 556–569.


Journal Article | Published | English
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Abstract
Directional intercellular transport of the phytohormone auxin mediated by PIN FORMED (PIN) efflux carriers plays essential roles in both coordinating patterning processes and integrating multiple external cues by rapidly redirecting auxin fluxes. Multilevel regulations of PIN activity under internal and external cues are complicated; however, the underlying molecular mechanism remains elusive. Here we demonstrate that 3’-Phosphoinositide-Dependent Protein Kinase1 (PDK1), which is conserved in plants and mammals, functions as a molecular hub integrating the upstream lipid signalling and the downstream substrate activity through phosphorylation. Genetic analysis uncovers that loss-of-function Arabidopsis mutant pdk1.1 pdk1.2 exhibits a plethora of abnormalities in organogenesis and growth, due to the defective PIN-dependent auxin transport. Further cellular and biochemical analyses reveal that PDK1 phosphorylates D6 Protein Kinase to facilitate its activity towards PIN proteins. Our studies establish a lipid-dependent phosphorylation cascade connecting membrane composition-based cellular signalling with plant growth and patterning by regulating morphogenetic auxin fluxes.
Publishing Year
Date Published
2020-05-01
Journal Title
Nature Plants
Volume
6
Page
556-569
eISSN
IST-REx-ID

Cite this

Tan S, Zhang X, Kong W, et al. The lipid code-dependent phosphoswitch PDK1–D6PK activates PIN-mediated auxin efflux in Arabidopsis. Nature Plants. 2020;6:556-569. doi:10.1038/s41477-020-0648-9
Tan, S., Zhang, X., Kong, W., Yang, X.-L., Molnar, G., Vondráková, Z., … Xue, H.-W. (2020). The lipid code-dependent phosphoswitch PDK1–D6PK activates PIN-mediated auxin efflux in Arabidopsis. Nature Plants, 6, 556–569. https://doi.org/10.1038/s41477-020-0648-9
Tan, Shutang, Xixi Zhang, Wei Kong, Xiao-Li Yang, Gergely Molnar, Zuzana Vondráková, Roberta Filepová, Jan Petrášek, Jiří Friml, and Hong-Wei Xue. “The Lipid Code-Dependent Phosphoswitch PDK1–D6PK Activates PIN-Mediated Auxin Efflux in Arabidopsis.” Nature Plants 6 (2020): 556–69. https://doi.org/10.1038/s41477-020-0648-9.
S. Tan et al., “The lipid code-dependent phosphoswitch PDK1–D6PK activates PIN-mediated auxin efflux in Arabidopsis,” Nature Plants, vol. 6, pp. 556–569, 2020.
Tan S, Zhang X, Kong W, Yang X-L, Molnar G, Vondráková Z, Filepová R, Petrášek J, Friml J, Xue H-W. 2020. The lipid code-dependent phosphoswitch PDK1–D6PK activates PIN-mediated auxin efflux in Arabidopsis. Nature Plants. 6, 556–569.
Tan, Shutang, et al. “The Lipid Code-Dependent Phosphoswitch PDK1–D6PK Activates PIN-Mediated Auxin Efflux in Arabidopsis.” Nature Plants, vol. 6, Springer Nature, 2020, pp. 556–69, doi:10.1038/s41477-020-0648-9.

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PMID: 32393881
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