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Synechococcus PCC7002의 세포 및 틸라코이드 막의 Polyvinylalcohol 고정화에 의한 광합성 특성
윤지은,전현식,이혜주,엄경일,선우양일,박인호,이진범 동의대학교 기초과학연구소 1994 基礎科學硏究論文集 Vol.4 No.1
Highly stable O₂-evolving cells and thylakoid membranes have been obtained from the cyanobacterium, Synechococcus PCC7002, by immobilization with polyvinylalcohol(PVA). The absorption peak showed the blue-shift to about 3 nm after immobilization of intact cells and thylakoid membranes as well as isolation of thylakoid membranes. Photosynthetic electron transport activities, especially PS Ⅱ activity showed greater stability in the PVA-immobilized cells and thylakoid membranes when stored at 4℃ than in those at 25℃. When the cells were threated at higher temperature, the level of Fo and Fv increased. After immobilization, however, Fo showed no changed. This suggests that the immobilization can protect against the damages of PS Ⅱ complex, especially a water-spiliting system, by heat treatment.
Polyvinylalcohol에 고정한 시금치 엽록체와 백금 촉매를 이용한 광수소 발생
朴仁虎,沈恩貞,李鎭範,李蕙珠,嚴慶一,鮮于洋一 동의대학교 기초과학연구소 1994 基礎科學硏究論文集 Vol.4 No.1
Photoproduction of hydrogen by free and polyvinylalcohol (PVA)-immobilized spinach chloroplasts was investigated. Immobilization of chloroplast with PVA increased the functional stability of the chloroplast during storage. PVA-immobilized chloroplasts preserved photosynthetic electron transport activity much better than free chloroplasts. The hydrogen production of free chloroplast decreased to 17% of initial activity after storage of six days. The hydrogen production of the PVA-immobilized chloroplasts, however, showed 44% of initial activity after storage of 15 days. The maximal rate of hydrogen production was accomplished at 27℃ under the light intensity above 116 μE·m^-2 · s^-1. The amount of hydrogen produced was proportional to the chlorophyll concentration. The hydrogen production was inhibited by DCMU treatment, indicating hydrogen production is dependent on photosynthetic electron transport. These results suggest that PVA is a good candidate for the immobilization matrix of chloroplasts for the photoproduction of hydrogen.
Synechococcus PCC7002의 세포 및 틸라코이드 막의 Polyvinylalcohol 고정화에 의한 광합성 특성
박인호,선우 양일,이혜주,엄경일,이진범,전현식,윤지은 東亞大學校附設基礎科學硏究所 1993 基礎科學硏究論文集 Vol.10 No.1
산소발생능에 있어 오랜 기간 안정성을 유지하는 세포와 분리 틸라코이드 막을 단세포성 남조류인 Synechococcus PCC7002로보터 PVA로 고정화하여 구할 수 있었다. 분리 틸라코이드 막 및 고정화한 세포나 틸라코이드 막의 흡수스펙트럼의 굽대가 청색 쪽이로 3㎚ 정도 전이하였다. PVA에 고정화한 세포나 틸라코이드 막은 4°C 에 보관할 경우 광합성에 의한 전자전달 활성, 특히 광계 2의 활성을 오랜기간 보존할 수 있었다. 세포를 고온헤 처리하였을 때 Fo와 Fv가 증가하였으나 고정화한 후에는 Fo의 변화가 거의 없었다. 이 결과는 고정화가 열처리에 의한 광계 2 복합체의 손상 특히 물분해기구의 손상에 대해 보호작용을 할 수 있음을 시사한다. Highly stable O₂-evolving cells and thylakoid membranes have been obtained from the cyanobacterium, Synechococcus PCC7002, by immobilization with polyvinylalcohol(PVA). The absorption peak showed the blue-shift of about 3 nm after immobilization of intact cells and thylakoid membranes as well as isolation of thylakoid membranes. Photosynthetic electron transport activities, especially PS Ⅱ activity showed greater stability in the PVA-immobilized cells and thylakoid membranes when stored at 4°C than in those at 25°C. When the cells were threated at higher temperature, the level of Fo and Fv increased. After immobilization, however, Fo showed no change. This suggests that the immobilization can protect against the damages of PS Ⅱ complex, especially a water-spiliting system, by heat treatment. Key words : immobilization, cyanobacterium, Synechococcus PC7002, oxygen evolution, photosynthesis polyvinylalcohol, fluorescence. Abbreviations : PS, photosystem ; PBQ, phenyl-p-benzoquinone ; Chl, chloropyll ; PVA, polyvinyl-alcohol ; Fo, initial fluorescence ; Fv, variable fluorescence ; Fm, maximum fluorescence ; DCPIP, 2, 6-dichlorophenolindophenol ; Asco, ascorbic acid ; HEPES, N-2-hydroxyethylpiperazine-N'-2-ethanesul-fonic acid ; Tricine, N-tris [hydroxymethyl]-methylglycine ; MES, 2-[N-morpholino] ethanesulfonic acid ; MV, methylviologen.