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Evolutionary Changes in Chlorophyllide a Oxygenase (CAO) Structure Contribute to the Acquisition of a New Light-harvesting Complex in Micromonas

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/53278

Title: Evolutionary Changes in Chlorophyllide a Oxygenase (CAO) Structure Contribute to the Acquisition of a New Light-harvesting Complex in Micromonas
Authors: Kunugi, Motoshi Browse this author
Takabayashi, Atsushi Browse this author →KAKEN DB
Tanaka, Ayumi Browse this author
Issue Date: 5-Jul-2013
Publisher: American Society for Biochemistry and Molecular Biology
Journal Title: Journal of Biological Chemistry
Volume: 288
Issue: 27
Start Page: 19330
End Page: 19341
Publisher DOI: 10.1074/jbc.M113.462663
Abstract: Chlorophyll b is found in photosynthetic prokaryotes and primary and secondary endosymbionts, although their light-harvesting systems are quite different. Chlorophyll b is synthesized from chlorophyll a by chlorophyllide a oxygenase (CAO), which is a Rieske-mononuclear iron oxygenase. Comparison of the amino acid sequences of CAO among photosynthetic organisms elucidated changes in the domain structures of CAO during evolution. However, the evolutionary relationship between the light-harvesting system and the domain structure of CAO remains unclear. To elucidate this relationship, we investigated the CAO structure and the pigment composition of chlorophyll-protein complexes in the prasinophyte Micromonas. The Micromonas CAO is composed of two genes, MpCAO1 and MpCAO2, that possess Rieske and mononuclear iron-binding motifs, respectively. Only when both genes were introduced into the chlorophyll b-less Arabidopsis mutant (ch1-1) was chlorophyll b accumulated, indicating that cooperation between the two subunits is required to synthesize chlorophyll b. Although Micromonas has a characteristic light-harvesting system in which chlorophyll b is incorporated into the core antennas of reaction centers, chlorophyll b was also incorporated into the core antennas of reaction centers of the Arabidopsis transformants that contained the two Micromonas CAO proteins. Based on these results, we discuss the evolutionary relationship between the structures of CAO and light-harvesting systems.
Rights: This research was originally published in Journal of Biological Chemistry. Motoshi Kunugi, Atsushi Takabayashi, and Ayumi Tanaka. Evolutionary changes in chlorophyllide a oxygenase (CAO) structure contribute to the acquisition of a new light-harvesting complex in Micromonas. Journal of Biological Chemistry. 2013; Vol288(27):pp19330-19341. © the American Society for Biochemistry and Molecular Biology.
Type: article (author version)
URI: http://hdl.handle.net/2115/53278
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高林 厚史

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