Data-driven modeling of intracellular auxin fluxes indicates a dominant role of the ER in controlling nuclear auxin uptake
In plants, the phytohormone auxin acts as a master regulator of developmental processes and environmental responses. The best characterized process in the auxin regulatory network occurs at the subcellular scale, wherein auxin mediates signal transduction into transcriptional programs by triggering...
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
March 13, 2018
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| In: |
Cell reports
Year: 2018, Volume: 22, Issue: 11, Pages: 3044-3057 |
| ISSN: | 2211-1247 |
| DOI: | 10.1016/j.celrep.2018.02.074 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.celrep.2018.02.074
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| Author Notes: | Alistair M. Middleton, Cristina Dal Bosco, Phillip Chlap, Robert Bensch, Hartmann Harz, Fugang Ren, Stefan Bergmann, Sabrina Wend, Wilfried Weber, Ken-Ichiro Hayashi, Matias D. Zurbriggen, Rainer Uhl, Olaf Ronneberger, Klaus Palme, Christian Fleck, Alexander Dovzhenko |
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| 520 | |a In plants, the phytohormone auxin acts as a master regulator of developmental processes and environmental responses. The best characterized process in the auxin regulatory network occurs at the subcellular scale, wherein auxin mediates signal transduction into transcriptional programs by triggering the degradation of Aux/IAA transcriptional repressor proteins in the nucleus. However, whether and how auxin movement between the nucleus and the surrounding compartments is regulated remain elusive. Using a fluorescent auxin analog, we show that its diffusion into the nucleus is restricted. By combining mathematical modeling with time course assays on auxin-mediated nuclear signaling and quantitative phenotyping in single plant cell systems, we show that ER-to-nucleus auxin flux represents a major subcellular pathway to directly control nuclear auxin levels. Our findings propose that the homeostatically regulated auxin pool in the ER and ER-to-nucleus auxin fluxes underpin auxin-mediated downstream responses in plant cells. | ||
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