Comments: Bacterial cell-based two-hybrid (B2H) reporter vector. Use 12.5 ug/ml chloramphenicol for growth.

The pBAC-lacZ plasmid is a mini-F' that can be replicated in standard E. coli strains, but because it is maintained as a single copy episome, it gives low DNA yields. pBAC-lacZ also contains a second, higher copy number origin of replication (oriV) that is only active in the presence of a trans-acting factor encoded by the trfA gene. Transformax EPI300 cells express trfA from an inducible promoter that we have found is inducible with arabinose. When the trfA gene is induced in Transformax EPI300 cells, the copy number of pBAC-lacZ plasmid is increased in the cells and reasonable yields of plasmid can be obtained using a standard miniprep procedure.

Addgene has sequenced a portion of this plasmid for verification. Click here for the sequencing result.