Abstract：Lysostaphin is a single chain protease containing zinc which can kill staphylococcus aureus effectively. Endolysin which is the peculiar of the double-stranded DNA bacteriophages is a murein hydrolytic enzyme, it has a wide range of antibacterial effect. Lysostaphin and Endolysin have the high synergistic effect. In this study, the vectors pBC1-seq2+seq3-EGFP-neo containing Endolysin and Lysostaphin genes and two other marker genes of enhenced green fluorescent protein(EGFP) and neomycin(neo) were transfected into bovine(Bos taurus) fetal fibroblast by electroporation and nucleofector of AMAXA. Stable transfected monoclonal cells which were identified to be the positive-cells in the way of PCR technique were obtained through fluorescence and G418 selection. Using transfected cells as the donor, transfected embryos were produced with somatic cell nuclear transfer. we used different conditions of AMAXA nuleofecor(A-023,V-013,V-023 and T-016) to transfect bovine fetal fibroblast, the results showed the suitable program was T-016. There were 5 times transfection efficient of AMAXA nuleofecor (20.11%) than it of electroporation. The blastocyst developed normally and the rate was of it 20.08%. In our study, we built up bovine fetal fibroblast cell line, sought out transfection parameter of high transfection efficiency, and acquired transgenic cell lines and transgenic blastocyst containing Lysostaphin and Endolysin genes. In conclusion, the results can provide technology supporting for producing anti-mastitis transgenic bovine and searching the new therapy way of mastitis.
