Distribution and Functions of Lipids in Thylakoid Membranes from a Thermophilic Cyanobacterium, Mastigocladus laminosus(Biological Chemistry)
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概要
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The lipid distribution and function in the thylakoid membranes from a thermophilic cyanobacterium, Mastigocladus laminosus, were investigated. The thylakoid membranes were treated with digitonin and separated on a DEAE-cellulose column into fractions enriched in photosystem I or II complex. Lipid analyses showed a specific distribution of anionic lipids among the fractions. A mild delipidation of the membranes with cholate indicates that monogalactosyl diacylglycerol (MGDG) and sulfoquinovosyl diacylglycerol (SQDG) are released rapidly, while the major parts of digalactosyl diacylglycerol (DGDG) and phosphatidylglycerol (PG) are tightly associated with membranes, suggesting a different distribution between the two groups of lipids. Measurements of fluorescence of delipidated and reconstituted thylakoids showed the contribution of lipids to energy transfer. MGDG enhanced all the original fluorescence of thylakoids, while acidic PG and SQDG stimulated fluorescence of photosystem I and antena chlorophyll-protein complexes. DGDG was less effective under the conditions tested.
- 社団法人日本農芸化学会の論文
- 1991-04-23
著者
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HIRAYAMA Osamu
Department of Agricultural Chemistry, Faculty of Agriculture, Shimane University
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INAMURA Takashi
Department of Physics, Tokyo Institute of Technology
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Inamura Takashi
Department Of Agricultural Chemistry Faculty Of Agriculture Shimane University
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Hirayama Osamu
Department Of Agricultural Chemistry Faculty Of Agriculture Shimane University
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