METHODS TO MUTATE CIRCULAR DEOXYRIBONUCLEOTIDES

摘要

The invention provides improved mutagenic plasmids and a method for making and using them. In one embodiment a cyclic mutagenic nucleic acid is replicated to form interlocking, digestibly separable duplex or simplex rings; and then one or more of the interlocked rings are cleaved selectively by means of a restriction enzyme to liberate an intact duplex or simplex ring. The mutagenic plasmids show substantially improved efficiencies in transforming cellular microorganism that are exposed to them.