Generalized and mobilizable positive-selection cloning vectors.

We have modified the positive-selection cloning vector pUN121 to expand the numbers of unique cloning sites by insertion of a multiple cloning site into the lambda cI gene without disrupting its repressor function, resulting in plasmid pSKM10. Plasmid pSKM10 has seven restriction enzyme sites suitable for general cloning purposes. A mobilizable version (pSKM11) of pSKM10 was constructed by insertion of the IncP mob sequence which permitted mobilization of the plasmid into a wide variety of Gram- bacteria.