Purification and characterization of a 1,3-β-D-glucan recognition protein from Antheraea pernyi larve that is regulated after a specific immune challenge
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Pattern recognition receptors are known to participate in the activation of Prophenoloxidase system. In this study, a 1,3-β-D-glucan recognition protein was detected for the first time in Antheraea pernyi larvae (Ap-βGRP). Ap-βGRP was purified to 99.9% homogeneity from the hemolymph using traditional chromatographic methods. Ap-βGRP specifically bind 1,3-β-D-glucan and yeast, but not E. coli or M. luteus. The 1,3-β-D-glucan dependent phenoloxidase (PO) activity of the hemolymph inhibited by anti-Ap-βGRP antibody could be recovered by addition of purified Ap-βGRP. These results demonstrate that Ap-βGRP acts as a biosensor of 1,3-β-Dglucan to trigger the Prophenoloxidase system. A trace mount of 1,3-β-D-glucan or Ap-βGRP alone was unable to trigger the proPO system, but they both did. Ap-βGRP was specifically degraded following the activation of proPO with 1,3-β-Dglucan. These results indicate the variation in the amount of Ap-βGRP after specific immune challenge in A. pernyi hemolymph is an important regulation mechanism to immune response.
Abstract
Pattern recognition receptors are known to participate in the activation of Prophenoloxidase system. In this study, a 1,3-β-D-glucan recognition protein was detected for the first time in Antheraea pernyi larvae (Ap-βGRP). Ap-βGRP was purified to 99.9% homogeneity from the hemolymph using traditional chromatographic methods. Ap-βGRP specifically bind 1,3-β-D-glucan and yeast, but not E. coli or M. luteus. The 1,3-β-D-glucan dependent phenoloxidase (PO) activity of the hemolymph inhibited by anti-Ap-βGRP antibody could be recovered by addition of purified Ap-βGRP. These results demonstrate that Ap-βGRP acts as a biosensor of 1,3-β-Dglucan to trigger the Prophenoloxidase system. A trace mount of 1,3-β-D-glucan or Ap-βGRP alone was unable to trigger the proPO system, but they both did. Ap-βGRP was specifically degraded following the activation of proPO with 1,3-β-Dglucan. These results indicate the variation in the amount of Ap-βGRP after specific immune challenge in A. pernyi hemolymph is an important regulation mechanism to immune response.
참고문헌 (29)
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