Tropomyosin induces the synthesis of magnesian calcite in sea urchin spines

Yugo Kato, Woosuk Ha, Zehua Zheng, Lumi Negishi, Jun Kawano, Yoshihisa Kurita, Hitoshi Kurumizaka, Michio Suzuki

研究成果: ジャーナルへの寄稿学術誌査読

抄録

Calcium carbonate is present in many biominerals, including in the exoskeletons of crustaceans and shells of mollusks. High Mg-containing calcium carbonate was synthesized by high temperatures, high pressures or high molecular organic matter. For example, biogenic high Mg-containing calcite is synthesized under strictly controlled Mg concentration at ambient temperature and pressure. The spines of sea urchins consist of calcite, which contain a high percentage of magnesium. In this study, we investigated the factors that increase the magnesium content in calcite from the spines of the sea urchin, Heliocidaris crassispina. X-ray diffraction and inductively coupled plasma mass spectrometry analyses showed that sea urchin spines contain about 4.8% Mg. The organic matrix extracted from the H. crassispina spines induced the crystallization of amorphous phase and synthesis of magnesium-containing calcite, while amorphous was synthesized without SUE (sea urchin extract). In addition, aragonite was synthesized by SUE treated with protease-K. HC tropomyosin was specifically incorporated into Mg precipitates. Recombinant HC-tropomyosin induced calcite contained 0.1–2.5% Mg synthesis. Western blotting of sea urchin spine extracts confirmed that HC tropomyosin was present in the purple sea urchin spines at a protein weight ratio of 1.5%. These results show that HC tropomyosin is one factor that increases the magnesium concentration in the calcite of H. crassispina spines.

本文言語英語
論文番号108074
ジャーナルJournal of structural biology
216
2
DOI
出版ステータス出版済み - 6月 2024

!!!All Science Journal Classification (ASJC) codes

  • 構造生物学

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