Identification of Specific Restriction Fragments Associated with a Membrane Subparticle from Bacillus Subtilis
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When lysates of Bacillus subtilis were treated with restriction endonucleases EcoRI or HindIII, almost all of the DNA was released from the major plasma membrane fraction that was sedimentable at low speed. However, a very small part of the released DNA, when centrifuged at high speed, appeared to be bound to small membrane fragments. On agarose gels, this material, prepared with either enzyme, contained only a small number of restriction fragments, and the DNA in the sample hybridized with 11 to 12 EcoRI or HindIII fragments of chromosomal DNA. This DNA was used after nick-translation to screen Charon 4A clone banks for phages containing membrane-bound fragments. One of these was studied in detail. Only a part (about 5 kilobases) of the region present in this clone is important in binding the DNA to the membrane subparticle.
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