Biochemical characterization of the jasmonic acid methyltransferase gene from wasabi (Eutrema japonicum)

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  • Koeduka Takao
    Graduate School of Sciences and Technology for Innovation, Yamaguchi University
  • Suzuki Hideyuki
    Department of Research and Development, Kazusa DNA Research Institute
  • Taguchi Goro
    Department of Applied Biology, Faculty of Textile Science and Technology, Shinshu University
  • Matsui Kenji
    Graduate School of Sciences and Technology for Innovation, Yamaguchi University

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  • Biochemical characterization of the jasmonic acid methyltransferase gene from wasabi (<i>Eutrema japonicum</i>)

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<p>Methyl jasmonate and jasmonic acid play important roles as signaling molecules in regulating plant development and stress-related responses. Previous studies have shown that jasmonic acid carboxyl methyltransferase (JMT), which belongs to the SABATH methyltransferase gene family, catalyzes the transfer of methyl groups from S-adenosyl-L-methionine to the carboxyl groups of jasmonic acid. In the present study, we used RNA-seq analysis to identify a putative JMT gene, EujJMT, in wasabi (Eutrema japonicum). The EujJMT proteins showed the highest similarity (89% identity) to JMT proteins of Brassica rapa. Functional characterization of a recombinant EujJMT protein expressed in Escherichia coli showed the highest level of activity with jasmonic acid among the different carboxylic acids tested. The apparent Km value of EujJMT using jasmonic acid as substrate was 62.6 µM, which is comparable to the values of known JMTs. Phylogenetic analysis suggested that EujJMT shares a common ancestor with the JMTs of Arabidopsis and Brassica species and that the strict substrate specificity toward jasmonic acid is conserved among Brassicaceae JMTs.</p>

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