Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5544688 | Veterinary Immunology and Immunopathology | 2017 | 23 Pages |
Abstract
Chicken egg yolk immunoglobulin (IgY) is a superior alternative to mammalian immunoglobulin, but its practical application is limited due to the complex purification procedure. In this study, the C2 domain of streptococcal protein G (SPG) with the binding affinity for chicken IgY was expressed in E. coli as an elastin-like polypeptide (ELP) fusion protein, and purified to a high purity by inverse transition cycling (ITC). Binding experiments showed that chicken IgY could bind to and eluted off the ELP-C2 fusion protein in pH-, temperature- and/or time-dependent manners. By using the ELP-C2 protein, a simple chicken IgY purification method was developed, and its purification performance was compared with that of ammonium sulfate precipitation and ethanol fractionation. Quantitative SDS-PAGE analysis showed that the ELP-C2 binding capture method provided a chicken IgY purity of 96.3% and a recovery of 64%, both of which were significantly higher than that of the two traditional methods The ELP-C2 binding capture method could be accomplished within 3Â h, in contrast to 30.3Â h for ammonium sulfate precipitation or 4.3Â h for ethanol fractionation. These data suggest that the ELP-C2 binding capture was a simple, efficient and cost-effective method for purification of chicken IgY.
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Authors
Wenlong Xia, Huipeng Lu, Yangyang Li, Jun Cao, Xiaohui Zhou, Xinyu Zhang, Xiaoli Xia, Huaichang Sun,