Membrane Composition and Virus Susceptibility of Acholeplasma Laidlawii
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The membrane composition of 11 strains of Acholeplasma laidlawii, including three strains persistently infected with mycoplasmaviruses MVL51, MVL2, and MVL3, was studied and correlated with mycoplasmavirus sensitivity. Membranes of the strains had similiar sodium dodecyl sulfate-polyacrylamide gel electrophoresis patterns, and all strains were inhibited by an antiserum produced against membranes from one of the strains. The amounts of integral membrane proteins solubilized by the nonionic detergent Tween 20 differed considerably. Therefore, characteristic crossed immunoelectrophoresis patterns were obtained for each strain. Strains persistently infected with MVL2 and MVL3 were notably different from the noninfected host. The ability to propagate any of the viruses was not correlated with sodium dodecyl sulfate-polyacrylamide gel electrophoresis or crossed immunoelectrophoresis patterns. The persistently infected strains had a characteristic lipid composition. MVL51-resistant strains, including a resistant clone selected from a sensitive strain, were characterized by a large monoglucosyldiglyceride/diglucosyldiglyceride ratio and trace amounts of diphosphatidylglyceol (as opposed to the sensitive strains). Differences in lipid composition in A. laidlawii seem to affect the relationship between cells and viruses.
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