Screening of wound-responsive genes identifies an immediate-early expressed gene encoding a highly charged protein in mechanically wounded tobacco plants

Kojiro Hara, Mitsue Yagi, Nozomu Koizumi, Tomonobu Kusano, Hiroshi Sano

    Research output: Contribution to journalArticlepeer-review

    43 Citations (Scopus)

    Abstract

    In order to identify genes that are temporally and spatially regulated during wound response, a cDNA population in mechanically wounded tobacco leaves was screened by the fluorescence differential display method. Of 28 clones initially identified to have altered levels of transcripts within 3 h of wounding, eight were characterized. Although each clone showed a unique pattern of transcript accumulation, one distinct clone was further characterized because of its immediate-early response. Its transcripts began to accumulate 10 rain after wounding, reached a maximum level within 1 h and disappeared after 2 h. The response, which occurred repeatably and systemically, was observed by the treatment with propionic acid or erythrosin B, indicating that cytosolic acidification could be one of the signals for immediate-early response of this gene. The cDNA encodes a polypeptide of 513 amino acids with a relative molecular mass of 60,952. The putative polypeptlde is rich in lysine (K), glutamic acid (E) and aspartic acid (D), which constitute up to 70% of total amino acids, and was therefore designated as KED. The KED polypeptide is composed of a highly hydrophilic N-terminal region and a relatively hydrophobic C-terminal region, suggesting that KED may function through electrostatic interactions with cellular components.

    Original languageEnglish
    Pages (from-to)684-691
    Number of pages8
    JournalPlant and Cell Physiology
    Volume41
    Issue number6
    DOIs
    Publication statusPublished - 2000

    Keywords

    • Charged protein
    • Fluorescence differential display
    • Nicotiana tabacum
    • Systemic response
    • Wounding

    ASJC Scopus subject areas

    • Physiology
    • Plant Science
    • Cell Biology

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