Novel nuclear and cytoplasmic proteins detected by anti-Zoothamnium arbuscula (protozoa) spasmin 1 antibody in mammalian cells are dependent on the cell cycle

Takeshi Itabashi, Takeo Terasaki, Hiroshi Asai

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Spasmin is a calcium-binding protein that is the major component of calcium-induced contractile filaments, called spasmoneme, found in vorticellid ciliates. Such filaments have not been observed in any organisms other than green algae. To determine whether calcium-induced contractile filaments resembling spasmoneme are present in higher eukaryotes, we performed immunofluorescence imaging of an anti-Zoothamnium arbuscula (protozoa, ciliophora) spasmin 1 polyclonal antibody in HeLa cells. In the cytoplasm, ubiquitous antigens seemed to be co-localized with microtubules at interphase, but not throughout mitosis. In the nucleus, areas linked to the nuclear envelope contained a number of hot spots. These regions were unclear during condensation of the replicated chromosomes, but became clearly visible again at cytokinesis. Immunoblotting analysis identified localized antigens during different phases of the cell cycle, including a 68/71 kDa cytoplasmic protein and a 55 kDa nuclear protein in interphase, and a 55/70 kDa protein in mitosis. The anti-spasmin 1 antibody recognized antigens in both hamster kidney BHK21 cells and Human lung cancer A-549 cells. These results suggest that novel spasmin-like proteins could be common in mammalian cells.

    Original languageEnglish
    Pages (from-to)651-657
    Number of pages7
    JournalJournal of Biochemistry
    Volume136
    Issue number5
    DOIs
    Publication statusPublished - 2004 Nov

    Fingerprint

    Protozoa
    Nuclear Proteins
    Cell Cycle
    Cells
    Antibodies
    Interphase
    Mitosis
    Antigens
    Proteins
    Ciliophora
    Calcium
    Chlorophyta
    Calcium-Binding Proteins
    Cytokinesis
    Nuclear Envelope
    Algae
    Chromosomes
    Eukaryota
    HeLa Cells
    Immunoblotting

    Keywords

    • Calcium-induced contractile filaments
    • Cell cycle
    • Centrin
    • Nucleus
    • Spasmin
    • Tubulin

    ASJC Scopus subject areas

    • Biochemistry

    Cite this

    Novel nuclear and cytoplasmic proteins detected by anti-Zoothamnium arbuscula (protozoa) spasmin 1 antibody in mammalian cells are dependent on the cell cycle. / Itabashi, Takeshi; Terasaki, Takeo; Asai, Hiroshi.

    In: Journal of Biochemistry, Vol. 136, No. 5, 11.2004, p. 651-657.

    Research output: Contribution to journalArticle

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