Identification of a Novel Vinyl Reductase Gene Essential for the Biosynthesis of Monovinyl Chlorophyll in Synechocystis sp. PCC6803
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概要
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The vast majority of oxygenic photosynthetic organisms use monovinyl chlorophyll for their photosynthetic reactions. For the biosynthesis of this type of chlorophyll, the reduction of the 8-vinyl group that is located on the B ring of the macrocycle is essential. Previously, we identified the gene encoding 8-vinyl reductase responsible for thisreaction in higher plants, and termed it DVR. Among the sequenced genomes of cyanobacteria, only several Synechococcus species contain DVR homologues. Therefore, it has been hypothesized that many other cyanobacteria producing monovinyl chlorophyll should contain a vinyl reductase which is unrelated to the higher-plant DVR.In order to identify the cyanobacterial gene that is responsible for monovinyl chlorophyll synthesis, we developed a bioinformatics tool, CCCT (Correlation Coefficient Calculation Tool), which calculates the correlation coefficient between the distributions of a certain phenotype and genes among a group of organisms. The program indicated that the distribution of a gene encoding a putative dehydrogenase-protein is best correlated with the distribution of the DVR-less cyanobacteria. We subsequently knocked out the corresponding gene (Slr1923) in Synechocystis sp. PCC6803 and characterized the mutant. The knock-out mutant lost its ability to synthesize monovinyl chlorophyll and, accumulated 3,8-divinyl chlorophyll instead. We concluded that Slr1923 encodes the vinyl reductase or a subunit essential for monovinyl chlorophyll synthesis. The function and evolution of 8-vinyl reductase genes are discussed.
- 2008-04-04
著者
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田中 歩
北海道大学低温科学研究所
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Yokono Makio
Molecular Photoscience Research Center, Kobe University
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Tanaka Ryouichi
Hokkaido Univ. Sapporo Jpn
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Yokono Makio
Molecular Photoscience Research Center Kobe University
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Tanaka Ayumi
Institute Of Low Temperature Science Hokkaido University
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Tanaka Ayumi
Institute Of Low Temperatue Science Hokkaido University
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Tanaka Ryouichi
Institute Of Low Temperature Science Hokkaido University
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田中 歩
Hokkaido Univ. Sapporo Jpn
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