Induction of oxidative stress by overexpression of α-zein cDNA with mutation in signal peptide in Arabidopsis

Jun Hyeok Kim, Ngoc Trinh Nguyen, Vu Van Kien, Nguyen Hoai Nguyen, Young Seok Jang, Hojoung Lee, Suk Whan Hong

Research output: Contribution to journalArticle

Abstract

Defective endosperm (De*)-B30 is a dominant maize mutation in the gene that encodes the storage protein, α-zein protein. The De*-B30 mutation results in a defective signal peptide in a 19-kD α-zein protein, which triggers endoplasmic reticulum (ER) stress, leading to up-regulation of genes associated with the unfolded protein response. To extend our knowledge of the physiological responses to constitutive ER stress in plants, transgenic Arabidopsis plants were constructed, in which De*-B30 transcripts were constitutively expressed under the control of the CaMV 35S promoter. Transgenic plants exhibited pale green leaves and growth retardation during the early vegetative stage. In addition, the growth rate of hypocotyl elongation was depressed in dark-grown transgenic seedlings. However, RNA blot analyses revealed no induction of the ER stress-inducible genes, including AtBiP1, AtCNX1, and AtCRT1 in transgenic Arabidopsis plants. Even though transgenic plants also were revealed to retain wild-type level of tunicamycin sensitivity, they showed an increase in hydrogen peroxide production. Higher levels of AtGST1 gene expression in transgenic plants were revealed. These findings suggest that reactive oxygen species are involved in the response to constitutive ER stress in Arabidopsis.

Original languageEnglish
Pages (from-to)575-581
Number of pages7
JournalJournal of the Korean Society for Applied Biological Chemistry
Volume56
Issue number5
DOIs
Publication statusPublished - 2013 Oct 1

Keywords

  • De-B30
  • endoplasmic reticulum
  • reactive oxygen species
  • transgenic plants
  • unfolded protein response
  • zein

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Organic Chemistry

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