Involvement of the membrane-localized ubiquitin ligase ATL8 in sugar starvation response in Arabidopsis
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- Luo Yongming
- Faculty of Science and Graduate School of Life Science, Hokkaido University
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- Aoyama Shoki
- Faculty of Science and Graduate School of Life Science, Hokkaido University
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- Fukao Yoichiro
- Department of Bioinformatics, College of Life Sciences, Ritsumeikan University
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- Chiba Yukako
- Faculty of Science and Graduate School of Life Science, Hokkaido University
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- Sato Takeo
- Faculty of Science and Graduate School of Life Science, Hokkaido University
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- Yamaguchi Junji
- Faculty of Science and Graduate School of Life Science, Hokkaido University
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Abstract
<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 ATL8 is a sugar starvation response gene and that ATL8 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>
Journal
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- Plant Biotechnology
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Plant Biotechnology 36 (2), 107-112, 2019-06-25
Japanese Society for Plant Biotechnology
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Details 詳細情報について
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- CRID
- 1390001288151480960
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- NII Article ID
- 130007672660
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- NII Book ID
- AA11250821
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- ISSN
- 13476114
- 13424580
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- NDL BIB ID
- 030207585
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed