Rxivist logo

Auxin-induced nanoclustering of membrane signaling complexes underlies cell polarity establishment in Arabidopsis

By Xue Pan, Linjing Fang, Jianfeng Liu, Betul Senay-Aras, Wenwei Lin, Shuan Zheng, Tong Zhang, Uri Manor, Weitao Chen, Zhenbiao Yang

Posted 13 Aug 2019
bioRxiv DOI: 10.1101/734665

Cell polarity is fundamental to the development of both eukaryotic and prokaryotic organisms, yet the mechanism of its establishment remains poorly understood. Here we show that signal-activated nanoclustering of membrane proteins and a cytoskeleton-based feedback loop provide an important mechanism for the establishment of cell polarity. The phytohormone auxin promoted sterol-dependent nanoclustering of cell surface transmembrane receptor-like kinase 1 (TMK1) to initiate cell polarity during the morphogenesis of Arabidopsis puzzle piece-shaped leaf pavement cells (PC). Auxin-triggered nanoclustering of TMK1 stabilized flotillin-associated ordered nanodomains, which were essential for auxin-mediated formation of ROP6 GTPase nanoclusters that act downstream TMK1 to promote cortical microtubule ordering. Mathematical modeling further demonstrated the essential role of this auxin-mediated stabilization of TMK1 and ROP6 nanoclusters, and predicted the additional requirement of ROP6-dependent cortical microtubules for further stabilization of TMK1-sterol nanodomains and the polarization of PC. This prediction was experimentally validated by genetic and biochemical data. Our studies reveal a new paradigm for polarity establishment: A diffusive signal triggers cell polarization by activating cell surface receptor-mediated lateral segregation of signaling components and a cytoskeleton-mediated positive feedback loop of nanodomain stabilization. Highlights

Download data

  • Downloaded 837 times
  • Download rankings, all-time:
    • Site-wide: 14,263 out of 84,910
    • In cell biology: 592 out of 4,311
  • Year to date:
    • Site-wide: 7,277 out of 84,910
  • Since beginning of last month:
    • Site-wide: 5,966 out of 84,910

Altmetric data

Downloads over time

Distribution of downloads per paper, site-wide


Sign up for the Rxivist weekly newsletter! (Click here for more details.)