Expression and Localization of Two SecA Homologs in the Unicellular Red Alga<i>Cyanidioschyzon merolae</i>

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  • KOYAMA Yosuke
    Department of Biochemistry and Molecular Biology, Graduate School of Science and Engineering, Saitama University
  • KANEKO Yasuko
    Department of Science Education, Faculty of Education, Saitama University
  • MATSUOKA Satoshi
    Department of Biochemistry and Molecular Biology, Graduate School of Science and Engineering, Saitama University
  • MATSUMOTO Kouji
    Department of Biochemistry and Molecular Biology, Graduate School of Science and Engineering, Saitama University
  • HARA Hiroshi
    Department of Biochemistry and Molecular Biology, Graduate School of Science and Engineering, Saitama University
  • OHTA Niji
    Department of Biochemistry and Molecular Biology, Graduate School of Science and Engineering, Saitama University

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  • Expression and Localization of Two SecA Homologs in the Unicellular Red Alga Cyanidioschyzon merolae

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SecA is an ATP-driven motor for Sec translocase that participates in bacterial protein export and thylakoidal import in plants. We have reported that Cyanidioschyzon merolae, a unicellular red alga, possesses a nuclear-encoded secA(nuc) and a plastid-encoded secA(pt) gene. In this study we found that the amount of SecA(nuc) protein almost quadrupled at high temperature, whereas that of the SecA(pt) protein increased far less. We were also able to determine the localization of both SecAs to the chloroplast by immunofluorescence and immunoelectron microscopy. We suggest that SecA(nuc) has an important role in the chloroplast at high temperatures.

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