Involvement of the membrane-localized ubiquitin ligase ATL8 in sugar starvation response in Arabidopsis

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<p>As major components of the ubiquitin system, ubiquitin ligases mediate the transfer of ubiquitin to specific target substrates, thereby playing important roles in regulating a wide range of cellular processes. The Arabidopsis Tóxicos en Levadura (ATL) family is a group of plant-specific RING-type ubiquitin ligases with N-terminal transmembrane-like domains. To date, 91 ATL isoforms have been identified in the Arabidopsis genome, with some reported to regulate plant responses to environmental stresses. However, the functions of most ATLs remain unclear. This study showed that <i>ATL8</i> is a sugar starvation response gene and that <i>ATL8</i> expression was significantly increased by sugar starvation conditions but repressed by exogenous sugar supply. The ATL8 protein was found to possess ubiquitin ligase activity in vitro and to localize to membrane-bound compartments in plant cells. In addition, Starch Synthase 4 was identified as a putative interactor with ATL8, suggesting that ATL8 may be involved in modulating starch accumulation in response to sugar availability. These findings suggest that ATL8 functions as a membrane-localized ubiquitin ligase likely to be involved in the adaptation of Arabidopsis plants to sugar starvation stress.</p>

収録刊行物

  • Plant Biotechnology

    Plant Biotechnology 36(2), 107-112, 2019

    日本植物細胞分子生物学会

各種コード

  • NII論文ID(NAID)
    130007672660
  • NII書誌ID(NCID)
    AA11250821
  • 本文言語コード
    ENG
  • ISSN
    1342-4580
  • NDL 記事登録ID
    030207585
  • NDL 請求記号
    Z54-J126
  • データ提供元
    NDL  J-STAGE 
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