1996 Fiscal Year Final Research Report Summary
MECHANISM AND STRUCTURE OF PHOTOSYNTHETIC REACTION AND APPRATUS FOR APPLICATION OF ITS MECHANISM TO ENERGY PRODUCING BIOMEMBRANE
| Project/Area Number |
07455437
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生物・生体工学
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
NOZAWA Tsunenori TOHOKU UNIVERSITY,FACULTY OF ENGINEERING,PROFESSOR, 工学部, 教授 (10006322)
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| Co-Investigator(Kenkyū-buntansha) |
SHIKAMA Yuko TOHOKU UNIVERSITY,FACULTY OF ENGINEERING,RESEARCH ASSOCIATE, 工学部, 助手 (80250710)
KOBAYASHI Masayuki TOHOKU UNIVERSITY,FACULTY OF ENGINEERING,RESEARCH ASSOCIATE, 工学部, 助手 (70271864)
WANG Zheng TOHOKU UNIVERSITY,FACULTY OF ENGINEERING,ASSOCIATE PROFESSOR, 工学部, 助教授 (10213612)
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| Project Period (FY) |
1995 – 1996
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| Keywords | PHOTOSYNTHETIC MEMBRANE / REACTION CENTER COMPLEX / MEMBRANE ANTENNA / CHLOROSOME ANTENNA / SOLID STATE NMR / X-RAY DIFFRACTION SPECTROSCOPY / ATP SYNTHESIS / P-31 NMR |
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| Research Abstract |
Bio-membranes play key roles in many vital processes in life, especially energy production, and information transfer. In this project we have investigate the energy conversion processes in photosynthesis with an intention to apply its mechanism for construction of semi-synthetic artificial solar energy conversion. Photosynthetic living convert light energy to chemical energy by (1) capturing light energy and conversing it to excitation energy in antenna complex, (2) changing the excitation energy to electro-chemical energy in reaction center and electron transfer complexes, and (3) making the chemical energy ATP (adenosine tri-phosphate) in ATP ase. We have clarified the light capturing mechanism of antenna both on chlorosome and membrane antenna. The primary structures of the reaction center for a novel thermo-philic photosynthetic bacteria have been determined for the first time. The fine structures which modulate the electron transfer ability of reaction center have been clarified by electric and spectroscopic methods. Organization of pigments have been elucidated by magnetic circular dichroism methods for the antenna and photosynthetic membranes. Photosynthetic membrane vehicles (chromatophore) which contain antenna, reaction exenter, electron transfer protein and ATP ase have been studied with respect to its size distribution and photo-phosphorylation activity.
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