Immunochemical evaluation of radioiodinated protein A

Abstract

The [ 125I]iodoprotein A iodinated by the chloramine-T method using carrier-free 125I − to various specific activities (0.02–2.0 125I/mole protein A) displayed 85% binding activity to excess solid-phase rabbit IgG. On storage, however, the solid-phase IgG binding activity of the high specific activity [ 125I]iodoprotein A (∼ 2 125 I/protein A) decreased rapidly while that of the low specific activity [ 125I]iodoprotein A (∼ 0.2 125 I/protein A) remained essentially unchanged. Analysis of aged high specific activity [ 125I]iodoprotein A by thin-layer chromatography revealed that free 125I − was released from the [ 125I]iodoprotein A during storage. Removal of the released 125I − was accomplished by using anion exchange resin. High specific activity [ 125I]iodoprotein A was found to be more sensitive than the low specific activity [ 125I]iodoprotein A in quantitating aggregated IgG while the latter was as useful as the former in hybridoma screening. When protein A was labeled with the Bolton-Hunter reagent, the [ 125I]iodoprotein A had an IgG binding property and stability similar to the [ 125I]iodoprotein A labeled with the chloramine-T method. Since the chloramine-T method can yield high specific activity [ 125I]iodoprotein A and repurification of the aged preparation can easily be achieved by using anion exchange resin, we concluded that chloramine-T is more efficient than Bolton-Hunter reagent and that both methods yield materials with comparable immunochemical properties.