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Arabidopsis nitrate reductase activity is stimulated by the E3 SUMO ligase AtSIZ1

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  • Bong Soo Park

    (Research Institute for Agriculture and Life Sciences, Seoul National University
    Plant Genomics and Breeding Institute, Seoul National University)

  • Jong Tae Song

    (School of Applied Biosciences, Kyungpook National University)

  • Hak Soo Seo

    (Research Institute for Agriculture and Life Sciences, Seoul National University
    Plant Genomics and Breeding Institute, Seoul National University
    Bio-MAX Institute, Seoul National University)

Abstract

Small ubiquitin-related modifier (SUMO) is a small polypeptide that modulates protein activity and regulates hormone signalling, abiotic and biotic responses in plants. Here we show that AtSIZ regulates nitrogen assimilation in Arabidopsis through its E3 SUMO ligase function. Dwarf plants of siz1-2 flower early, show abnormal seed development and have high salicylic acid content and enhanced resistance to bacterial pathogens. These mutant phenotypes are reverted to wild-type phenotypes by exogenous ammonium but not by nitrate, phosphate or potassium. Decreased nitrate reductase activity in siz1-2 plants resulted in low nitrogen concentrations, low nitric oxide production and high nitrate content in comparison with wild-type plants. The nitrate reductases, NIA1 and NIA2, are sumoylated by AtSIZ1, which dramatically increases their activity. Both sumoylated and non-sumoylated NIA1 and NIA2 can form dimers. Our results indicate that AtSIZ1 positively controls nitrogen assimilation by promoting sumoylation of NRs in Arabidopsis.

Suggested Citation

  • Bong Soo Park & Jong Tae Song & Hak Soo Seo, 2011. "Arabidopsis nitrate reductase activity is stimulated by the E3 SUMO ligase AtSIZ1," Nature Communications, Nature, vol. 2(1), pages 1-10, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1408
    DOI: 10.1038/ncomms1408
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    Cited by:

    1. Deng, Jun & Liu, Ke & Xiong, Xin & Hussain, Tajamul & Huang, Liying & de Voil, Peter & Harrison, Matthew Tom & Tian, Xiaohai & Zhang, Yunbo, 2024. "Achieving sustainable rice production through nitrogen-potassium harmony for enhanced economic and environmental gains," Agricultural Water Management, Elsevier, vol. 301(C).

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