Molecular phylogeny and evolution of the plastid and nuclear encoded cbbX genes in the unicellular red alga Cyanidioschyzon merolae

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概要

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• The cbbX gene is generally encoded in proteobacterial genomes and red-algal plastid genomes. In this study, we found two distinct cbbX genes of Cyanidioschyzon merolae, a unicellular red alga, one encoded in the plastid genome and the other encoded in the cell nucleus. The phylogenetic tree inferred from cbbX genes and strongly conserved gene organization (rbcLS-cbbX) suggests that the plastid-encoded cbbX gene of C. merolae came from an ancestral proteobacterium by horizontal gene transfer. On the other hand, the nuclear-encoded cbbX gene of C. merolae was classified in another cluster together with the nucleomorph-encoded cbbX gene of Guillardia theta. Furthermore, expression of the two cbbX genes were regulated differently in response to extracellular CO2 concentration. Our results imply that cbbX gene in the plastid genome was copied and transferred to the cell nucleus after horizontal gene transfer of RuBisCo operon from ancestral β-proteobacteria at comparatively early stage, and that each cbbX evolved in different ways.

• 日本遺伝学会の論文
• 2008-04-25

著者

• Tanaka Kan

  Institute of Molecular and Cellular Biosciences, The University of Tokyo

• FUJITA Kiyohito

  Department of Molecular Biology, Faculty of Science, Saitama University

• OHTA Niji

  Department of Molecular Biology, Faculty of Science, Saitama University

• EHIRA Shigeki

  Department of Molecular Biology, Faculty of Science, Saitama University

• ASAI Kei

  Department of Molecular Biology, Faculty of Science, Saitama University

• Tanaka Kan

  Institute Of Applied Microbiology The University Of Tokyo

• Asai Kei

  Department Of Biochemistry And Molecular Biology Faculty Of Science Saitama University

• Asai Kei

  Department Of Molecular Biology Faculty Of Science Saitama University

• Ohta Niji

  Department Of Molecular Biology Faculty Of Science Saitama University

• Ehira Shigeki

  Department Of Molecular Biology Faculty Of Science Saitama University

• Ehira Shigeki

  Department Of Biochemistry And Molecular Biology Faculty Of Science Saitama University

• Fujita Kiyohito

  Department Of Molecular Biology Faculty Of Science Saitama University

• Asai Kei

  Department Of Biochemistry And Molecular Biology Faculty Of Science

• Ohta Niji

  Department Of Biochemistry And Molecular Biology Graduate School Of Science And Engineering Saitama

• Asai Kei

  Departement of Biochemistry and Molecular Biology, Faculty of Science, Saitama University

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