Photocontrol of Elicitor Activity of PIP-1 to Investigate Temporal Factors Involved in Phytoalexin Biosynthesis

Yonghyun Kim, Masahiro Miyashita, Hisashi Miyagawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The peptide elicitor PIP-1 can induce various immune responses in tobacco cells. Previously, we showed that types of responses induced by PIP-1 are different depending on its stimulation periods; short-term stimulation induces weak responses, whereas long-term stimulation leads to strong responses including production of the phytoalexin capsidiol. However, key components that directly regulate the initiation of capsidiol biosynthesis in response to continuous stimulation with PIP-1 remain unclear. In this study, we designed a photocleavable PIP-1 analog containing 3-amino-3-(2-nitrophenyl)propionic acid as a photocleavable residue. The activity of the analog can be "switched off" using ultraviolet (UV) irradiation without undesired side effects. This analog induced a significant level of capsidiol production unless UV-irradiated, whereas no capsidiol production was observed when tobacco cells were UV-irradiated 1 h after treatment. Using this analog, we found that the elicitor-inducible 3-hydroxy-3-methylglutaryl-CoA reductase activity is regulated based on the duration of the stimulation with PIP-1, which could be associated with the initiation of capsidiol biosynthesis.

Original languageEnglish
Pages (from-to)5894-5901
Number of pages8
JournalJournal of Agricultural and Food Chemistry
Issue number25
Publication statusPublished - 2015 Jul 1
Externally publishedYes


  • MAP kinase
  • peptide
  • photocleavable analog
  • phytoalexin
  • plant immunity

ASJC Scopus subject areas

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)


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