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Appl Environ Microbiol. 1993 January; 59(1): 97-100

Characterization of the genome of the Rhodococcus rhodochrous bacteriophage NJL.

Department of Applied Biological Science, College of Agriculture and Veterinary Science, Nihon University, Kanagawa, Japan.

ABSTRACT

Temperate bacteriophage NJL of Rhodococcus rhodochrous has a 49-kb linear double-stranded DNA with cohesive ends (cos). NJL DNA has unique target sites for HindIII and SspI, two target sites each for NheI and ScaI, and no cleavage site for AxyI, DraI, EcoRI, SacI, and SphI. The single-stranded regions of cos ends were ligated to each other with T4 DNA ligase, removed with mung bean nuclease, or blunted with the Klenow large fragment of DNA polymerase I; then the sequences of the cos ends were determined. Comparison of these sequences revealed that the single-stranded regions are complementary and 18 bases long and protrude at the 3' ends; they have the following sequences: 5'-TTGGCACCGTGGGAGGAG-3' and 3'-AACCGTGGCAC CCTCCTC-5'. A physical map of NJL was constructed by a cos mapping method based on information about the structure of the cohesive ends and multiple digestions with restriction endonucleases.