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J Bacteriol. 1968 June; 95(6): 2374-2392
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Fine Structure of Ectothiorhodospira mobilis Pelsh¹

^a Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543

ABSTRACT

The cell wall structure, arrangement of photosynthetic membranes, and the attachment of flagella of Ectothiorhodospira mobilis strain 8112 were examined by using freeze-etching and conventional electron microscopic techniques. The outer coat of the multilayered cell wall is comprised of 50 A repeating subunits, arranged in a regular array. The photosynthetic membranes, which originate from and are attached to the plasma membrane, are arranged in a more complex pattern than previously seen in other bacteria. The tuft of flagella in E. mobilis is inserted into a polar organelle. The relationship of this organelle to the polar membrane and the mechanism of attachment of the flagella to the polar organelle is discussed.

¹ Contribution no. 1899 from the Woods Hole Oceanographic Institution.

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