All E. coli recombinant strains grew well in LB medium, and the
lipases were expressed by induction with 0.2 mM IPTG. After 4 h
induction, the cells were harvested at an OD600nm of 3.0 (Fig. S2).
The soluble cell-free extracts of these strains were analyzed by
SDS–PAGE. As shown in Fig. 2, both CALB and TLL were clearly
expressed in E. coli (Calb/Tll) with one plasmid as well as E. coli
(Calb-Tll) with two plasmids.