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J Virol. 1982 August; 43(2): 566-573

New physical map of bacteriophage T5 DNA.

ABSTRACT

The locations of 103 cleavage sites, produced by 13 restriction endonucleases, were mapped on the DNA of bacteriophage T5. Single- and double-digest fragment sizes were determined by agarose gel electrophoresis, using restriction fragments of phi X174 DNA and lambda DNA as molecular weight standards. Map coordinates were determined by a computer-based least-squares procedures (J. Schroeder and F. Blattner, Gene [Amst] 4:167-174, 1978). The fragment sizes predicted by the final map are all within 2% of the measured values. Based on this analysis, T5st(+) DNA contains 121,300 base pairs (Mr, 80.3 X 10(6) and has a terminal repetition of 10,160 base pairs (Mr, 6.7 X 10(6)). Restriction endonuclease analysis after treatment with exonuclease III and a single-strand-specific endonuclease allowed precise localization of five of the natural single-chain interruptions in T5 DNA. Revised locations for several T5 deletions were also determined.

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