Characterization of the nuclear- and plastid-encoded secA-homologous genes in the unicellular red alga Cyanidioschyzon merolae |
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Authors: | Koyama Yosuke Takimoto Koji Kojima Asuka Asai Kei Matsuoka Satoshi Mitsui Toshiaki Matsumoto Kouji Hara Hiroshi Ohta Niji |
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Institution: | Department of Biochemistry and Molecular Biology, Graduate School of Science and Engineering, Saitama University, Saitama, Japan. |
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Abstract: | SecA is an ATP-driven motor for protein translocation in bacteria and plants. Mycobacteria and listeria were recently found to possess two functionally distinct secA genes. In this study, we found that Cyanidioschyzon merolae, a unicellular red alga, possessed two distinct secA-homologous genes; one encoded in the cell nucleus and the other in the plastid genome. We found that the plastid-encoded SecA homolog showed significant ATPase activity at low temperature, and that the ATPase activity of the nuclear-encoded SecA homolog showed significant activity at high temperature. We propose that the two SecA homologs play different roles in protein translocation. |
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