Edwardsiella tarda에 대한 계란난황항체의분리와 정제
Isolation and purification of chicken egg yolk immunoglobulin against Edwardsiella tarda
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초록
Edwardsiella tarda로 면역한 닭의 난황항체 (IgY) 정제 방법을 비교하였다. Anti-E. tarda IgY의 정제는 PEG법, chloroform-PEG법, ammonium sulfate법과 정제 kit를 사용한 4가지 다른 방법으로 실시하였다. 정제된 IgY는 64 kDa의 heavy chain과 27 kDa의 light chain을 나타내었다. E. tarda로 면역된 IgY는 면역되지 않은 대조 IgY 보다 높은 ELISA가와 응집항체가를 나타내었으며, 정제된 IgY는 western blotting에서 anti-E. tarda 토끼혈청과 유사한 E. tarda 단백질을 인식하였다. PEG법과 ammonium sulfate법에 의해 정제된 IgY는 응집항체가가 1:512, chloroform-PEG법과 정제 kit에 의해 정제된 IgY는 1:128을 나타내었으며, PEG법이 IgY를 정제하기 위한 가장 빠른 방법이었다. 이 연구의 결과로 PEG법이 IgY의 생물학적 활성을 유지함과 더불어 신속하고 효과적인 정제방법임을 알 수 있었다.
Abstract
The present study compared purification methods of hen egg yolk immunoglobulin (IgY) from the hen immunized with Edwardsiella tarda. The purification of anti-E. tarda IgY was performed by four different methods, polyethylene glycol (PEG), chloroform polyethylene glycol (Chloroform-PEG), ammonium sulfate and purification kit. Purified IgY had heavy chain of 64 kDa and light chain of 27 kDa size. IgY purified from the hen immunized with E. tarda showed higher ELISA values and agglutination titers than those with IgY purified from the non-immunized hen as a negative control. In addition, purified IgY recognized similar E. tarda proteins to those with anti-E. tarda rabbit serum by western blotting. Purified IgY had an agglutination titer of 1:512 by PEG method and ammonium sulfate method, and 1:128 by chloroform-PEG method and purification kit. Moreover, PEG method was the most rapid method among the four different IgY purification methods. These results indicate that PEG method is effective purification method maintaining biological activity of the IgY.
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