Change in the calcium-binding capacity of sea urchin egg homogenate caused by treatment with ATP and magnesium ions

M. Nakamura, I. Yasumasu

    研究成果: Article

    抄録

    The dissociation constant of the calcium and calcium-binding substance complex in sea urchin egg homogenate increased during incubation of the homogenate with CaCl2 at concentrations greater than 0.5 mM to the same value as that found in the fertilized egg homogenate. The dissociation constant of the calcium-binding substance in the unfertilized egg homogenate (pre-incubated with CaCl2), as well as the homogenate of the fertilized egg, was found to decrease to the value found in the unfertilized egg homogenate on treatment with 5 mM ATP and 5 mM MgCl2. It was found that a calcium-binding substance of the 'unfertilized egg type' was easily transformed to a 'fertilized egg type' by calcium ions and the fertilized egg type substance reversibly became an unfertilized egg type on treatment with ATP and Mg ions. This substance is therefore thought to play an important role in the regulation of the intracellular concentration of calcium.

    元の言語English
    ページ(範囲)121-126
    ページ数6
    ジャーナルExperimental Cell Research
    88
    発行部数1
    DOI
    出版物ステータスPublished - 1974

    Fingerprint

    Sea Urchins
    Magnesium
    Ovum
    Adenosine Triphosphate
    Zygote
    Ions
    Calcium
    Magnesium Chloride

    ASJC Scopus subject areas

    • Cell Biology

    これを引用

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    abstract = "The dissociation constant of the calcium and calcium-binding substance complex in sea urchin egg homogenate increased during incubation of the homogenate with CaCl2 at concentrations greater than 0.5 mM to the same value as that found in the fertilized egg homogenate. The dissociation constant of the calcium-binding substance in the unfertilized egg homogenate (pre-incubated with CaCl2), as well as the homogenate of the fertilized egg, was found to decrease to the value found in the unfertilized egg homogenate on treatment with 5 mM ATP and 5 mM MgCl2. It was found that a calcium-binding substance of the 'unfertilized egg type' was easily transformed to a 'fertilized egg type' by calcium ions and the fertilized egg type substance reversibly became an unfertilized egg type on treatment with ATP and Mg ions. This substance is therefore thought to play an important role in the regulation of the intracellular concentration of calcium.",
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    N2 - The dissociation constant of the calcium and calcium-binding substance complex in sea urchin egg homogenate increased during incubation of the homogenate with CaCl2 at concentrations greater than 0.5 mM to the same value as that found in the fertilized egg homogenate. The dissociation constant of the calcium-binding substance in the unfertilized egg homogenate (pre-incubated with CaCl2), as well as the homogenate of the fertilized egg, was found to decrease to the value found in the unfertilized egg homogenate on treatment with 5 mM ATP and 5 mM MgCl2. It was found that a calcium-binding substance of the 'unfertilized egg type' was easily transformed to a 'fertilized egg type' by calcium ions and the fertilized egg type substance reversibly became an unfertilized egg type on treatment with ATP and Mg ions. This substance is therefore thought to play an important role in the regulation of the intracellular concentration of calcium.

    AB - The dissociation constant of the calcium and calcium-binding substance complex in sea urchin egg homogenate increased during incubation of the homogenate with CaCl2 at concentrations greater than 0.5 mM to the same value as that found in the fertilized egg homogenate. The dissociation constant of the calcium-binding substance in the unfertilized egg homogenate (pre-incubated with CaCl2), as well as the homogenate of the fertilized egg, was found to decrease to the value found in the unfertilized egg homogenate on treatment with 5 mM ATP and 5 mM MgCl2. It was found that a calcium-binding substance of the 'unfertilized egg type' was easily transformed to a 'fertilized egg type' by calcium ions and the fertilized egg type substance reversibly became an unfertilized egg type on treatment with ATP and Mg ions. This substance is therefore thought to play an important role in the regulation of the intracellular concentration of calcium.

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