2010 Fiscal Year Final Research Report
Structural and functional roles of Ca2+ in the light-harvesting 1 complex from thermophilic purple sulfur bacterium Thermochromatium tepidum
| Project/Area Number |
20770102
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Functional biochemistry
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| Research Institution | Kobe University |
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Principal Investigator |
KIMURA Yukihiro Kobe University, 自然科学系先端融合研究環重点研究部, 助教 (20321755)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 紅色光合成細菌 / 耐熱性 / カルシウム / ストロンチウム |
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| Research Abstract |
Ca ions are responsible for unique properties of the purple sulfur photosynthetic bacterium Thermochromatium tepidum which is a moderate thermophile grown at the highest temperature among purple bacteria and shows an unusual LH1 Q_y absorption. The present spectroscopic and thermodynamic analyses revealed that the Ca^<2+>-binding little affects secondary structures of the LH1 proteins but precisely modulates conformation of BChl a and thermal stability of the LH1-RC complex. Furthermore, we discovered that Sr ion is an alternative cofactor biofunctionally replaceable with Ca ion in this thermophilic organism.
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Research Products
(18 results)
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[Journal Article] Strontium ions are functionally replaceable with calcium ions in the light-harvesting 1 reaction center core complex from Thermophilic purple sulfur bacterium Thermochromatium tepidum
Author(s)
Kimura, Y., Inada, Y. Yu, L.-J., Ohno, T., Wang, Z.-Y.
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Journal Title
proceedings of 15^<th> International Congress on Photosynthesis, Beijing, Aug. in press
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[Journal Article] Calcium ions are involved in the thermostability and the unusual red-shift of LH1 Q transition of the core complex from Thermophilic purple sulfur bacterium Thermochromatium tepidum
Author(s)
Kimura, Y., Yu, L.-J., Hirano, Y., Suzuki, H., Wang, Z.-Y.
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Journal Title
proceedings of 15^<th> International Congress on Photosynthesis, Beijing, Aug. in press
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[Presentation] Structural and functional roles of metal cations in the Photosynthetic core complex from thermophilic purple sulfur bacterium Thermochromatium tepidum2010
Author(s)
Kimura, Y., Inada, Y., Hirano, Y., Yu, L.-J., Wang, Z.-Y, Ohno, T.
Organizer
The International Chemical Congress of Pacific Basin Societies
Place of Presentation
Honolulu, U.S.A
Year and Date
20100900
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[Presentation] Strontium Ions Are Functionally Replaceable with Calcium Ions in the Light-Harvesting 1 Reaction Center Core Complex from Thermophilic Purple Sulfur bacterium Thermochromatium tepidum2010
Author(s)
Kimura, Y., Inada, Y., Yu, L.-J., Ohno, T., Wang, Z.-Y.
Organizer
15^<th> International Congress on Photosynthesis
Place of Presentation
Beijing, China, Aug
Year and Date
20100800
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[Presentation] Calcium Ions Are Involved in the Thermostability and the Unusual Red-Shift of LH1 Q Transition of the Core Complex from Thermophilic Purple Sulfur Bacterium Thermochromatium tepidum.2010
Author(s)
Kimura, Y., Yu, L.-J., Hirano, Y, Suzuki, H., Wang, Z.-Y.
Organizer
15^<th> International Congress on Photosynthesis
Place of Presentation
Beijing, China
Year and Date
20100800
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