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Pin1At regulates PIN1 polar localization and root gravitropism

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  • Wanyan Xi

    (Faculty of Science, National University of Singapore
    Present address: Department of Molecular Biology, Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany.)

  • Ximing Gong

    (Faculty of Science, National University of Singapore)

  • Qiaoyun Yang

    (Faculty of Science, National University of Singapore)

  • Hao Yu

    (Faculty of Science, National University of Singapore
    Temasek Life Sciences Laboratory, National University of Singapore)

  • Yih-Cherng Liou

    (Faculty of Science, National University of Singapore
    Graduate School for Integrative Sciences and Engineering, National University of Singapore)

Abstract

Root gravitropism allows plants to establish root systems and its regulation depends on polar auxin transport mediated by PIN-FORMED (PIN) auxin transporters. PINOID (PID) and PROTEIN PHOSPHATASE 2A (PP2A) act antagonistically on reversible phosphorylation of PINs. This regulates polar PIN distribution and auxin transport. Here we show that a peptidyl-prolyl cis/trans isomerase Pin1At regulates root gravitropism. Downregulation of Pin1At suppresses root agravitropic phenotypes of pp2aa and 35S:PID, while overexpression of Pin1At affects root gravitropic responses and enhances the pp2aa agravitropic phenotype. Pin1At also affects auxin transport and polar localization of PIN1 in stele cells, which is mediated by PID and PP2A. Furthermore, Pin1At catalyses the conformational change of the phosphorylated Ser/Thr-Pro motifs of PIN1. Thus, Pin1At mediates the conformational dynamics of PIN1 and affects PID- and PP2A-mediated regulation of PIN1 polar localization, which correlates with the regulation of root gravitropism.

Suggested Citation

  • Wanyan Xi & Ximing Gong & Qiaoyun Yang & Hao Yu & Yih-Cherng Liou, 2016. "Pin1At regulates PIN1 polar localization and root gravitropism," Nature Communications, Nature, vol. 7(1), pages 1-10, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10430
    DOI: 10.1038/ncomms10430
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    Cited by:

    1. Huaiguo Shang & Na Zhang & Zhouli Xie & Siyu Deng & Licong Yi & Xing Huang, 2021. "Genome-Wide Identification and Expression of the PIN Auxin Efflux Carrier Gene Family in Watermelon ( Citrullus lanatus )," Agriculture, MDPI, vol. 11(5), pages 1-11, May.

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