By A.H. Rose (ed.), D.W. Tempest (ed.)
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Extra info for Advances in Microbial Physiology, Vol. 10
Osmotic lysis, the gentlest method so far devised for the isolation of mycoplasma membranes, does not always work because the organisms’ sensitivity t o osmotic shock varies with the age of the culture (Razin, 1964) and the species (Razin, 1963). While Acholeplasma strains are usually highly sensitive, the sterol-requiring Mycoplasma strains frequently resist osmotic lysis. Other techniques have therefore been resorted to, such as alternate freezing and thawing (Hollingdale and Lemcke, 1969 ; Williams and Taylor-Robinson, 1967) or ultrasonic treatment (Argaman and Razin, 1969; Hollingdale and Lemcke, 1969).
I n light of the results of Gourlay and Wyld, however, these differences may not weigh too heavily, and it seems, perhaps, premature to assign new names to the viruses isolated by Liss and Maniloff (1971). The extensive studies of Gourlay’s group (Gourlay, 1972a) and of Liss and Maniloff (1971) show that MV-L1 and MV-L2 can infect only A . laidlawii strains. Viruses infecting A . laidlawii and resembling MV-L1 in their biological properties were, however, also isolated from cultures ofA. granularum (Gourlay, 1972a), a goat mycoplasma (Liss and Maniloff, 1971) and a variety of other mycoplasma species (Maniloff, 1972).
Sodium deoxycholate occupying an intermediate position. , 1971). , 1971 ; Morowitz and Terry, 1969). It appears that, during membrane solubilization by detergents, two antagonistic processes take place simultaneously, namely the activation or unmasking of some enzymic activities and the denaturation and consequent inactivation of the solubilized enzymes. g. , 1970) and may be ascribed t,o the exposure of sterically hindered catalytic sites in the course of membrane solubilization. 3. Fractionation of Membrane Proteins Solubilization of the hydrophobic membrane proteins is only the first step in their characterization.
Advances in Microbial Physiology, Vol. 10 by A.H. Rose (ed.), D.W. Tempest (ed.)