HSP90 regulates temperature-dependent seedling growth in Arabidopsis by stabilizing the auxin co-receptor F-box protein TIR1

Renhou Wang, Yi Zhang, Martin Kieffer, Hong Yu, Stefan Kepinski and Mark Estelle ()
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Renhou Wang: Section of Cell and Developmental Biology, University of San Diego California, Howard Hughes Medical Institute
Yi Zhang: Section of Cell and Developmental Biology, University of San Diego California, Howard Hughes Medical Institute
Martin Kieffer: Centre for Plant Sciences, Faculty of Biological Sciences, University of Leeds
Hong Yu: Section of Cell and Developmental Biology, University of San Diego California, Howard Hughes Medical Institute
Stefan Kepinski: Centre for Plant Sciences, Faculty of Biological Sciences, University of Leeds
Mark Estelle: Section of Cell and Developmental Biology, University of San Diego California, Howard Hughes Medical Institute

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract Recent studies have revealed that a mild increase in environmental temperature stimulates the growth of Arabidopsis seedlings by promoting biosynthesis of the plant hormone auxin. However, little is known about the role of other factors in this process. In this report, we show that increased temperature promotes rapid accumulation of the TIR1 auxin co-receptor, an effect that is dependent on the molecular chaperone HSP90. In addition, we show that HSP90 and the co-chaperone SGT1 each interact with TIR1, confirming that TIR1 is an HSP90 client. Inhibition of HSP90 activity results in degradation of TIR1 and interestingly, defects in a range of auxin-mediated growth processes at lower as well as higher temperatures. Our results indicate that HSP90 and SGT1 integrate temperature and auxin signalling in order to regulate plant growth in a changing environment.

Date: 2016
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DOI: 10.1038/ncomms10269

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