We report a method for efficient mutagenesis of DNA in large vectors without subcloning. Two segments of the target DNA sequence, one having a mutation introduced via a mutant primer, were amplified by PCR and then the purified fragments were ligated to a vector. The mutation efficiency was nearly 100%.
Supramolecular Biology, International Graduate School of Arts and Sciences, Yokohama City University, Suehiro-cho 1-7-29, Tsurumi-ku, Yokohama 230-0045, Japan.