Overexpression of rice OsREX1-S, encoding a putative component of the core general transcription and DNA repair factor IIH, renders plant cells tolerant to cadmium- and UV-induced damage by enhancing DNA excision repair

Shuta Kunihiro, Hikaru Kowata, Youichi Kondou, Shinya Takahashi, Minami Matsui, Thomas Berberich, Shohab Youssefian, Jun Hidema, Tomonobu Kusano

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Screening of 40,000 Arabidopsis FOX (Full-length cDNA Over-eXpressor gene hunting system) lines expressing rice full-length cDNAs brings us to identify four cadmium (Cd)-tolerant lines, one of which carried OsREX1-S as a transgene. OsREX1-S shows the highest levels of identity to Chlamydomonas reinhardtii REX1-S (referred to as CrREX1-S, in which REX denotes Required for Excision) and to yeast and human TFB5s (RNA polymerase II transcription factor B5), both of which are components of the general transcription and DNA repair factor, TFIIH. Transient expression of OsREX1-S consistently localized the protein to the nucleus of onion cells. The newly generated transgenic Arabidopsis plants expressing OsREX1-S reproducibly displayed enhanced Cd tolerance, confirming that the Cd-tolerance of the initial identified line was conferred solely by OsREX1-S expression. Furthermore, transgenic Arabidopsis plants expressing OsREX1-S exhibited ultraviolet-B (UVB) tolerance by reducing the amounts of cyclobutane pyrimidine dimers produced by UVB radiation. Moreover, those transgenic OsREX1-S Arabidopsis plants became resistant to bleomycin (an inducer of DNA strand break) and mitomycin C (DNA intercalating activity), compared to wild type. Our results indicate that OsREX1-S renders host plants tolerant to Cd, UVB radiation, bleomycin and mitomycin C through the enhanced DNA excision repair.

    Original languageEnglish
    Pages (from-to)1101-1111
    Number of pages11
    JournalPlanta
    Volume239
    Issue number5
    DOIs
    Publication statusPublished - 2014 Jan 1

    Keywords

    • Arabidopsis
    • Cd-tolerance
    • DNA excision repair
    • FOX-hunting system
    • Rice cDNA
    • UVB tolerance

    ASJC Scopus subject areas

    • Genetics
    • Plant Science

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