J Integr Plant Biol. ›› 2022, Vol. 64 ›› Issue (7): 1297-1302.DOI: 10.1111/jipb.13273

• Breakthrough Report •     Next Articles

UBA domain protein SUF1 interacts with NatA-complex subunit NAA15 to regulate thermotolerance in Arabidopsis

Ze‐Ting Song1,3, Xiao‐Jie Chen2, Ling Luo3, Feifei Yu4, Jian‐Xiang Liu1* and Jia‐Jia Han1,2,3*   

  1. 1 State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310027, China
    2 Yunnan Key Laboratory of Plant Reproductive Adaptation and Evolutionary Ecology, Institute of Biodiversity, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China
    3 Laboratory of Ecology and Evolutionary Biology, State Key Laboratory for Conservation and Utilization of Bio‐Resources in Yunnan, Yunnan University, Kunming 650500, China
    4 College of Grassland Science and Technology, China Agricultural University, Beijing 100083, China

    *Correspondences: Jian‐Xiang Liu (jianxiangliu@zju.edu.cn); Jia‐Jia Han (hanjiajia@ynu.edu.cn, Dr. Han is responsible for the distribution of materials associated with this article)
  • Received:2022-04-20 Accepted:2022-05-05 Online:2022-06-07 Published:2022-07-01

Abstract: During recovery from heat stress, plants clear away the heat-stress-induced misfolded proteins through the ubiquitin-proteasome system (UPS). In the UPS, the recognition of substrate proteins by E3 ligase can be regulated by the N-terminal acetyltransferase A (NatA) complex. Here, we determined that Arabidopsis STRESS-RELATED UBIQUITIN-ASSOCIATED-DOMAIN PROTEIN FACTOR 1 (SUF1) interacts with the NatA complex core subunit NAA15 and positively regulates NAA15. The suf1 and naa15 mutants are sensitive to heat stress; the NatA substrate NSNC1 is stabilized in suf1 mutant plants during heat stress recovery. Therefore, SUF1 and its interactor NAA15 play important roles in basal thermotolerance in Arabidopsis.

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