| Autor: |
Brandt, Peter, Eichenberger, Waldemar |
| Předmět: |
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| Zdroj: |
Physiologia Plantarum; Aug91, Vol. 82 Issue 4, p594-598, 5p |
| Abstrakt: |
The thylakoid membranes of isolated Euglena chloroplasts were separated into two fractions (appressed and non-appressed membranes) by aqueous two-phase partitioning (mixture of dextran 500 and polyethylene glycol 4 000) following press disruption. The lipid composition of these two fractions differ in many respects during most of the cell cycle of this alga in comparison with the thylakoid characteristics of higher plants or green algae. The monogalactosyldiglyceride to digalactosyldiglyceride ratio changes during the cell cycle and the vesicles originating from appressed and nonappressed .thylakoid membranes, respectively, differ in this property at the beginning, but tend to be equal at the end of the cell cycle. The levels of sulfoquinovosyldiglyceride and phosphatidylglycerol are highest in appressed membrane regions at about the 6th hour of the cell cycle but are highest in non-appressed membranes near the end of the cell cycle. The insertion and/or assembly of synthesized LHCII is correlated with a high monogalactosyldiglyceride to digalactosyldiglyceride ratio in appressed membrane regions. The heterogeneity of the lipid composition is discussed in relation to the stage-specific development of structure and function of Euglena chloroplasts. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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