Abstract
The ultrastructure of the cell wall and the thylakoid membranes of the thermophilic cyanobacterium Synechococcus lividus was studied by freezefracture electron microscopy after temperature shifts. Different fracture faces of the outer, the cytoplasmic and the thylakoid membranes were demonstrated when the preparation-temperature was in the range of the optimal growth temperature at 52°C or after fixation at 52°C. In the outer membrane of the cell wall two fracture faces with holes and 7.5 nm intramembrane particles were detected. On both the outer (EF) and inner (PF) leaflet of the cytoplasmic membrane randomly distributed particles were demonstrated. The particle density on the PF-face was approx. three times that of the EF-face. The EF-face of the thylakoid membrane exposed rows of particles with an average diameter of 10 nm. The spacing between the particle rows was 35–50 nm. This regular particle arrangement on the EF-face was demonstrated only in a few cases. Mostly the intramembrane particles were distributed randomly on the thylakoid fracture faces. The particle density of thylakoids with a random distribution was approx. in the same range both on the EF-and PF-face. The EF-particles fall into four groups of 9,10,11, and 12.5 nm. The main particle class was the 10 nm class. The PF-face exposed smaller particles with two maxima at 8.5–9 nm and 10 nm. When Synechococcus lividus OH-53s was chilled to temperatures below 30–35°C before the freeze-etch preparation a phase transition took place after the temperature shift. On the fracture faces of the thylakoid and cytoplasmic membranes particle depleted areas occurred. The size of the areas were different in both membranes and dependent on the velocity of cooling. Contrary to Synechococcus lividus OH-53s in the mesophilic Synechococcus strain 6910 the phase transition point was 15°C. The lower phase transition point may be due to a higher content of unsaturated fatty acids.
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Dedicated to Prof. D. Peters (Hamburg) on the occasion of the 65th anniversary of his birthday
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Golecki, J.R. Ultrastructure of cell wall and thylakoid membranes of the thermophilic cyanobacterium Synechococcus lividus under the influence of temperature shifts. Arch. Microbiol. 120, 125–133 (1979). https://doi.org/10.1007/BF00409098
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DOI: https://doi.org/10.1007/BF00409098