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Differences in the architecture of cytoplasmic and intra cytoplasmic membranes of 3 chemotrophically and phototrophically grown species of the rhodospirillaceae


Journal of Bacteriology 144(2): 781-788
Differences in the architecture of cytoplasmic and intra cytoplasmic membranes of 3 chemotrophically and phototrophically grown species of the rhodospirillaceae
Freeze-fracture faces of membranes of either chemotrophically or phototrophically grown Rhodospirillum rubrum, R. tenue, Rhodopseudomonas sphaeroides were analyzed. All 3 spp. differed from each other with respect to size as well as numerical density (number per square micrometer) of intramembrane particles. In R. rubrum the number of particles on exoplasmic fracture facies of the cytoplasmic membrane stayed nearly constant (about 900 particles/.mu.m2), but on the plasmic fracture face there were 4700 and 6264 particles/.mu.m2, respectively, under chemotrophic and phototrophic conditions. The increase in number was largely a result of an enhanced occurrence of particles 10 nm in diameter. This diameter corresponds to the mean diameter of the predominant class of particles visible on the plasmic fracture faces of intracytoplasmic membranes formed under phototrophic conditions. In R. sphaeroides the number of particles of both of the fracture faces of cytoplasmic membranes stayed nearly constant. The mean diameter of particles appeared to be slightly increased under phototrophic conditions. Particles of cytoplasmic and intracytoplasmic membranes of phototrophically grown cells were of similar diameter. The number of particles on plasmic fracture faces of intracytoplasmic membranes (6674/.mu.m2) was significantly higher than that on cytoplasmic membranes (5708/.mu.m2). R. tenue which does not produce intracytoplasmic membranes showed on exoplasmic fracture faces 543 and 3765 particles/.mu.m2 under chemotrophic and phototrophic conditions, respectively, whereas the corresponding numerical densities of plasmic fracture faces were 4043 and 3711 particles/.mu.m2. The increased number of particles on exoplasmic fracture faces was mainly the result of an increased occurrence of particles with diameters .gtoreq. 10 nm. The results are interpreted to allow for the different modes of intracytoplasmic membrane development in R. rubrum and R. sphaeroides, respectively.


Accession: 005151086



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