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- W2007164958 abstract "Induction of specific immunological unresponsiveness by oral autoantigens such as glutamic acid decarboxylase 65 (GAD65) is termed oral tolerance and may be a potential therapy for autoimmune diabetes. However, the requirement for large amounts of protein will limit clinical testing of autoantigens, which are difficult to produce. Mucosal adjuvants such as cholera toxin B subunit (CTB) may lower the level of autoantigens required. Here we describe cloning, expression, purification and identification study of the CTB and triple GAD(531-545) epitopes fusion gene. The fusion gene was ligated via a flexible hinge tetrapeptide and expressed as a soluble protein in Escherichia coli BL21 (DE3) driven by the T7 promoter. We purified the recombination protein from the cell lysate and obtained approximately 2.5mg of CTB-GAD((531-545)3) per liter of culture with greater than 90% purity by a Ni-NTA resin column. The bacteria produced this protein as the pentameric form, which retained the GM1-ganglioside binding affinity and the native antigenicity of CTB and GAD65. Further studies revealed that oral administration of bacterial CTB-GAD((531-545)3) fusion protein showed the prominent reduction in pancreatic islet inflammation in non-obese diabetic mice. The results presented here demonstrate that the bacteria bioreactor is an ideal production system for an oral protein vaccine designed to develop immunological tolerance against autoimmune diabetes." @default.
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- W2007164958 date "2009-08-01" @default.
- W2007164958 modified "2023-10-17" @default.
- W2007164958 title "Cloning, expression, purification and characterization of the cholera toxin B subunit and triple glutamic acid decarboxylase epitopes fusion protein in Escherichia coli" @default.
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- W2007164958 doi "https://doi.org/10.1016/j.pep.2009.04.002" @default.
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