Construction of the eukaryotic recombinant vector and expression of the outer membrane protein LipL32 gene from Leptospira serovar Lai

AIM:To construct the eukaryotic experssion vector of LipL32 gene from Leptospira serovar Lai and express the recombinant plasmid in COS-7 cell.METHODS:The LipL32 gene was amplified from Leptospira strain 017 genomic DNA by PCR and cloned into pcDNA3.1,through restriction nuclease enzyme digestion.Then the recombinant plasmid was transformed into E.coli DH5α.After identified by nuclease digestion,PCR and sequencing analysis,the recombinant vector was transfected into COS-7 cell with lipsome.The expression of the target gene was detected by RT-PCR and Western blot.RESULTS:The eukaryotic experssion vector pcDNA3.1-LipL32 was successfully constructed and stably expressed in COS-7 cell.CONCLUSION:The eukaryotic recombinant vector of outer membrane protein LipL32 gene from Leptospira serovar Lai can be expressed in mammalian cell,which provides an experimental basis for the application of the Leptospira DNA vaccine.