By A.H. Rose (ed.), D.W. Tempest (ed.)
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Extra resources for Advances in Microbial Physiology, Vol. 10
1972). , 1972). , 1972), has not been reported in any other species. , 1969). 38 SHMUEL RAZEN Presumably the mechanism of biosynthesis of phosphatidylglycerol and diphosphatidylglycerol is the same as in bacteria, although it has not been examined in any detail. Evidence presented by Plackett and Rodwell (1970) suggests that phosphatidylglycerol is synthesized from cytidine diphosphodiglyceride and sn-glycerol-3-phosphate. Phosphatidylglycerol may then be the precursor of diphosphatidylglycerol.
Mycoplasma gallinarum strain J is also capable of glycosylating cholesterol to cholesteryl glucoside (Smith, 1971b). Rodwell (1963),Argaman and Razin (1965) and Razin and Shafer (1969), however, found that labelled cholesterol incorporated by growing mycoplasmas of different species was neither esterified nor changed in any other way. When examining the binding of cholesterol to isolated mycoplasma. membranes in a buffer system containing cholesterol and Tween $0 (8. Razin, N. Gershfeld and M. Wormser, unpublished data), cholesterol appeared to be incorporated into the lipid region.
RIBOSOMAL HELICES Under certain conditions, especially when the cells are harvested by centrifugation without prior fixation, the ribosomes of M . gallisepticum, but not of any other mycoplasma examined so far, form helical corncob-like structures of over 50 ribosomes each (Fig. , 1970). Recent optical diffraction and rotational symmetry analyses of electron micrographs (Maniloff, 1971) have shown the structures to consist of a helix repeat of 10 ribosomes in three turns. The interaction of the 50 S ribosomal subunits seems to stabilize the helix since chloramphenicol and lincomycin, which are known t o bind to these subunits, inhibited helix formation, which remained unaffected by streptomycin and tetracycline, which in turn are known to bind to the 30 S subunits.