Quinlan DC, Maniloff J. Membrane association of the deoxyribonucleic acid growing-point region in Mycoplasma gallisepticum.
J Bacteriol 1972;
112:1375-9. [PMID:
4264449 PMCID:
PMC251573 DOI:
10.1128/jb.112.3.1375-1379.1972]
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Abstract
Newly replicated deoxyribonucleic acid (DNA) in Mycoplasma gallisepticum A5969 is membrane associated. Cells pulse-labeled 1 to 3 min with (3)H-thymidine are lysed by a freeze-thaw procedure. After brief sonic treatment to shear the DNA, differential centrifugation gives a cell fraction (P2) that is enriched sevenfold for pulse-labeled DNA. P2 contains 80% of the total adenosine triphosphatase activity, 65% of the total cholesterol, and morphologically intact terminal bleb structures. Three to four minutes are needed to fully label the DNA growing-point region, whereas 7 to 8 min are required to "chase" 50% of the (3)H-labeled DNA. This pulse-chase removes 80 to 85% of the nascent DNA from the P2 fraction.
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