The pIEx/BacTM-4 Ek/LIC vector has an N-terminal GST-Tag™ coding sequence followed by a recognition site for enterokinase. The Ek/LIC cloning site is followed by an optional C-terminal His•Tag® coding sequence. This Ek/LIC vector is ready for rapid, directional cloning of PCR-amplified DNA, without restriction enzyme digestion or ligation. The pIEx/Bac vectors are dual-purpose vectors that offer unique flexibility for cloning and expression of proteins in Spodoptera-derived insect cells. These vectors contain the Autographa californica nuclear polyhedrosis virus (AcNPV) enhancer/immediate early promoter combination (hr5/ie1) for plasmid-mediated and early baculovirus expression, and the AcNPV p10 very late promoter for robust baculovirus-mediated expression. All pIEx/Bac plasmids carry AcNPV-derived virus regions to mediate recombination at the polh locus.