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Antibacterial Activity of Recombinant Porcine β-Defensin 2
Kuohai Fan1,§, Yina An1,§, Zhirui Wang2, Wei Yin1, Na Sun1, Yaogui Sun1, Ajab Khan1 and Hongquan Li1,*
1College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi030801, P.R. China
2Center for Transplantation Sciences, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
*Corresponding author:


To express and purify the recombinant porcine β-defensin 2 (rpBD-2) using yeast Pichia Pastoris expression system and in vitro characterization of it’s antibacterial activity. rpBD-2 was expressed and then purified using methylotrophic yeast Pichia Pastoris expression system. To assess its antimicrobial activity against Escherichia coli, Salmonella paratyphi A, Pseudomonas aeruginosa, Staphylococcus epidermidis, Staphylococcus aureus, Bacillus pumilus, and Bacillus subtilis, liquid growth inhibition assay was used. The antibacterial activity was further kinetically evaluated against representative bacterial strains E. coli and S. aureus. The hemolysis activity of rpBD-2 was also checked against porcine erythrocytes. rpBD-2 was expressed and purified successfully using yeast Pichia Pastoris expression system. The yield of final product was 9 mg per liter of the harvested supernatant. rpBD-2 possessed antimicrobial activity against E. coli, S. aureus, S. epidermidis, B. subtilis, and B. pumilus at 33.3-66.6 μM and killed all E. coli and S. aureus within 30 min. Negligible hemolytic activity was observed against porcine erythrocytes. We have successfully developed rpBD-2 as an effective antibacterial peptide against both gram-positive and negative bacteria. rpBD-2 will be a potential novel therapeutic agent against bacterial infection.

To Cite This Article: Fan K, An Y, Wang Z, Yin W, Sun N, Sun Y, Khan A and Li H, 2019. Antibacterial activity of recombinant porcine β-defensin 2. Pak Vet J, 39(3): 411-415.


ISSN 0253-8318 (Print)
ISSN 2074-7764 (Online)