J Integr Plant Biol. ›› 2017, Vol. 59 ›› Issue (12): 851-865.DOI: 10.1111/jipb.12578

• Cell and Developmental Biology • Previous Articles     Next Articles

Arabidopsis EXO70A1 recruits Patellin3 to the cell membrane independent of its role as an exocyst subunit

Chengyun Wu1, Lu Tan1, Max van Hooren2, Xiaoyun Tan1, Feng Liu1, Yan Li1, Yanxue Zhao1, Bingxuan Li1, Qingchen Rui1, Teun Munnik2 and Yiqun Bao1*   

  1. 1College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
    2Department of Plant Cell Biology, Swammerdam Institute for Life Sciences (SILS), University of Amsterdam, 1098 XH, Amsterdam, The Netherlands
  • Received:2017-07-08 Accepted:2017-08-14 Published:2017-08-16
  • About author:*Correspondence: E-mail: Yiqun Bao (baoyiqun@njau.edu.cn)


The exocyst is a well-known complex which tethers vesicles at the cell membrane before fusion. Whether an individual subunit can execute a unique function is largely unknown. Using yeast-two-hybrid (Y2H) analysis, we found that EXO70A1 interacted with the GOLD domain of Patellin3 (PATL3). The direct EXO70A1-PATL3 interaction was supported by in vitro and in vivo experiments. In Arabidopsis, PATL3-GFP colocalized with EXO70A1 predominantly at the cell membrane, and PATL3 localization was insensitive to BFA and TryA23. Remarkably, in the exo70a1 mutant, PATL3 proteins accumulated as punctate structures within the cytosol, which did not colocalize with several endomembrane compartment markers, and was insensitive to BFA. Furthermore, PATL3 localization was not changed in the exo70e2, PRsec6 or exo84b mutants. These data suggested that EXO70A1, but not other exocyst subunits, was responsible for PATL3 localization, which is independent of its role in secretory/recycling vesicle-tethering/fusion. Both EXO70A1 and PATL3 were shown to bind PI4P and PI(4,5)P2 in vitro. Evidence was obtained that the other four members of the PATL family bound to EXO70A1 as well, and shared a similar localization pattern as PATL3. These findings offered new insights into exocyst subunit-specific function, and provided data and tools for further characterization of PATL family proteins.

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