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Structure and restriction enzyme maps of the circularly permuted DNA of staphylococcal bacteriophage phi 11

One restriction enzyme map of Staphylococcus aureus bacteriophage phi 11 DNA was established by reciprocal double digestions with the enzymes EcoRI, HaeII, and KpnI. The sequential order of the EcoRI fragments was thereafter established by a novel approach involving blotting of DNA partially cleaved with EcoRI and the probing the blots with nick-translated terminal fragments. A circular map of the phi 11 DNA was established, and the phage genome was circularly permuted based on the failure to end label mature viral DNA, restriction maps of replicating DNA, and finally, homoduplex analysis in the electron microscope. A restriction enzyme map of the prophage form of phi 11 DNA was obtained by analysis of chromosomal DNA from a lysogenic strain.