Advances in Microbial Physiology, Vol. 10 by A.H. Rose (ed.), D.W. Tempest (ed.)

By A.H. Rose (ed.), D.W. Tempest (ed.)

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4. Ribosomal helices in sectioned cells of Mycoplasma gallisepticum. Taken from Bernstein-Ziv (1969). 24 SHMUEL RAZIN As inhibition of RNA or protein synthesis by specific inhibitors did not affect helix formation, the helices cannot be active polyribosomes. This view is re-inforced by the finding that ribosomal helices are also formed in E . They rather seem to be the result of some environmental perturbation-low pH value in the case of E . coli, centrifugation in the case of M . gallisepticum-but why they appear in M .

Kahane and Razin (196913) were unable to show turnover of polar lipids except in young cultures of A . laidlawii. While it would be precipitate to assume that polar lipids from A . Zaidlawii are metabolically stable under all conditions, it may be safely concluded from McElhaney and Tourtellotte’s findings that turnover of polar lipid is not obligatory for proper membrane function. 2. Glycolipids The glycolipids that form a major constituent of the poIar lipids of fermentative mycoplasmas are glycosyl diglycerides, acylated sugars and cholesteryl or carotenyl glycosides.

The fatty-acid combinations are indicated on the graphs. Taken from McElhaney et al. (1970). , 1966a). Similarly, the fatty-acid pairs required for growth of the goat mycoplasma strain Y (p. 44) may be needed to regulate the cohesion forces between the lipid molecules in the membrane, so that it should not become either too fluid or too condensed. Elaidic acid, being a trans fatty acid, may physically simulate a mixture of saturated and unsaturated acids and provide the right fluidity for the lipid region (Rodwell, 1968).

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