Abstract
Early in the infection with bacteriophage M13 the infecting parental DNA strand becomes attached to the host cell membrane. Using a gentle lysis procedure followed by sucrose gradient centrifugation, up to 80% of the parental DNA co-sediment with the bacterial membranes. The membrane fraction was deproteinized by phenol extraction and the solubilized DNA was further analysed by band sedimentation in neutral and alkaline CsCl gradients. Between 5′ and 15′ after infection at least half of the membrane bound parental DNA was found to be incorporated into replicative intermediates with viral strands of more than unit length.
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