The lipBL gene was PCR-amplified from the pFP plasmid/vector using primers BL7SIF/BL7HdIIIR2 to introduce SacI and HindIII sites at the 59 and 39 ends of the gene, respectively. The PCR product and the pET28b+ plasmid were hydrolysed with SacI and HindIII restriction endonucleases,
followed by ligation, to yield the pET-LipBL expression vector. With this approach, the lipase gene coding sequence was fused, in-frame, to a coding sequence for a His6-tag, thereby allowing
overexpression of C-terminal His6-tagged LipBL. Gene expression in pET-LipBL was under the control of a T7 promoter regulated by IPTG-inducible T7 RNA polymerase.