ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (7): 1208-1214.doi: 10.11843/j.issn.0366-6964.2015.07.018

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Comparison and Analysis of the Biological Activity of Antiserum after Immunizing with Expressed Different Domains of Staphylococus aureus Adhesin FnBPA Isolated from Bovine Milk

SHAO Jun-gao,ZHANG Bao-jiang,LI Shan-chun,WANG Cai-die,WANG Guo-qin,SU Yan*   

  1. (Veterinary Medicine College of Xinjiang Agricultural University,Urumqi 830052,China)
  • Received:2014-10-28 Online:2015-07-23 Published:2015-07-23

Abstract:

The aim of this study was to express FnBPA-A(A domain of fibrinogen-binding region A)and FnBPA-BCD (BCD domain of fibrinogen-binding region A different domains of FnBPA) of Staphylococcus aureus,and compare the adhesion inhibition activities of their antiserum for prevention of bovine mastitis caused by S.aureus.FnBPA-A and FnBPA-BCD encoding genes were cloned and inserted into pET-28a vector.Then the recombinant proteins were expressed and purified to immune Newzeland rabbits and mice.The adhesin binding ability,adhesion inhibition activity of their serum antibody and challenge protection ability were tested.The results showed that the antibody level,the binding ability to Fg and Fn and adhesion inhibition activity of FnBPA-A and FnBPA-BCD co-immunization group were better than that of single immunization groups.The mice antibody level of FnBPA-A immunization group and co-immunization group were better than that of FnBPA-BCD immunization group.In addition,FnBPA-A and co-immunization group showed better adhesion inhibition activity to Fg,FnBPA-BCD and co-immunization group showed better adhesion inhibition activity to Fn.The immunological protection result showed that each group had good protective effect and FnBPA-A immunization group was the best one.The results of this study may provide the basis for design of new vaccines of bovine mastitis caused by S.aureus.

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