PUB4, a CERK1-Interacting Ubiquitin Ligase, Positively Regulates MAMP-Triggered Immunity in Arabidopsis

  • Yoshitake Desaki
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Shohei Takahashi
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Kenta Sato
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Kanako Maeda
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Saki Matsui
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Ikuya Yoshimi
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Takaki Miura
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Jun-Ichi Jumonji
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Jun Takeda
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Kohei Yashima
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Masaki Kohari
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Takayoshi Suenaga
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Hayato Terada
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Tomoko Narisawa
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Takeo Shimizu
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Emi Yumoto
    Advanced Instrumental Analysis Center, Teikyo University, Utsunomiya, Tochigi, Japan
  • Koji Miyamoto
    Department of Biosciences, Faculty of Science and Engineering, Teikyo University, Utsunomiya, Tochigi, Japan
  • Mari Narusaka
    Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries, Research Institute for Biological Sciences, Okayama, Japan
  • Yoshihiro Narusaka
    Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries, Research Institute for Biological Sciences, Okayama, Japan
  • Hanae Kaku
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan
  • Naoto Shibuya
    Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, Japan

抄録

<jats:title>Abstract</jats:title> <jats:p>Lysin motif (LysM) receptor-like kinase CERK1 is a co-receptor essential for plant immune responses against carbohydrate microbe-associated molecular patterns (MAMPs). Concerning the immediate downstream signaling components of CERK1, receptor-like cytoplasmic kinases such as PBL27 and other RLCK VII members have been reported to regulate immune responses positively. In this study, we report that a novel CERK1-interacting E3 ubiquitin ligase, PUB4, is also involved in the regulation of MAMP-triggered immune responses. Knockout of PUB4 resulted in the alteration of chitin-induced defense responses, indicating that PUB4 positively regulates reactive oxygen species generation and callose deposition but negatively regulates MAPK activation and defense gene expression. On the other hand, detailed analyses of a double knockout mutant of pub4 and sid2, a mutant of salicylic acid (SA) synthesis pathway, showed that the contradictory phenotype of the pub4 mutant was actually caused by abnormal accumulation of SA in this mutant and that PUB4 is a positive regulator of immune responses. The present and recent findings on the role of PUB4 indicate that PUB4 is a unique E3 ubiquitin ligase involved in the regulation of both plant immunity and growth/development.</jats:p>

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