The cleavage of polyoma virus DNA by restriction enzymes KpnI and PstI

The action of two restriction endonucleases on polyoma virus DNA has been examined and the sites at which they cleave the DNA located. One of the enzymes, KpnI from Klebsiella pneumoniae OK8, cleaves polyoma DNA twice at about 11-6 and 59-2% from the EcoRI site. The other enzyme, PstI from Providencia stuartii 164, cleaves polyoma DNA five times at about 14-8, 16-5, 32-6, 50-3 and 80-0% from the EcoRI site. Some of the cleavages produced by these enzymes alone, or in conjunction with other endonucleases, may be of use in the isolation of regions of particular interest from the virus DNA.