2014 Fiscal Year Final Research Report
A variety of glycolipids in green photosynthetic bacteria: cyclopropane-ring formation in the acyl groups of glycolipids is crucial for acid and thermal resistance of antenna systems
| Project/Area Number |
24550065
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Organic chemistry
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 糖脂質 / 脂肪酸 / 光合成 / クロロフィル / 精密計測 / 光合成細菌 |
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| Outline of Final Research Achievements |
Green photosynthetic bacteria have unique antenna systems called chlorosomes. A themophilic bacterium Chlorobaculum tepidum strain biosynthesized MGDG and RGDG possessing a methylene-bridged palmitoleyl group characterized by a cis-substituted cyclopropane ring. The formation of the cyclopropane ring was chemically inhibited. The ring-formation represented direct and post-synthetic modifications of chlorosome membrane properties and was tolerant of acidic environments.
The glycolipids in various green bacteria were investigated. Dependence of the molecular structures including the chain-length of their acyl groups upon bacterial cultivation temperatures was clearly observed. The organisms with their optimal temperatures of 30, 45, and 55 ℃ dominantly accumulated glycolipids with the acyl chains in the range of C15-C16, C16-C17, and C18-C20, respectively. Based on the detailed of glycolipids, a survival strategy of green bacteria grown in the wide range of temperatures is proposed.
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| Free Research Field |
光合成機能性分子の精密計測
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