Recombinant bovine leukemia virus receptor, BLVRcp1, possessed the unusual property of binding plastic plates after blocking nonspecific binding sites. Adhesiveness of BLVRcp1 to blocked plates hindered development of an antigen capture and receptor binding assay with this protein. Unexpectedly, non-specific adsorption of BLVRcp1 was dramatically influenced by temperature. Optimizing incubation temperature and antigen capture at 4°C instead of 37°C and the use of milk as blocking solution removed nonspecific binding of BLVRcp1 allowing development of a functional immunoassay. Thus, the temperature used for antigen capture can be a critical factor that influences performance of the immunoassay.
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