After biotinylation, purified MHC-I monomers were tested for biotinylation efficiency. Purified monomers (2 μg) were incubated with 4 μg of Streptavidin-plus (ProZyme SA10) for 30 min at 4°C. After incubation, proteins were separated on 4 to 20% Mini-PROTEAN TGX Gel (Bio-Rad, 4561095) along with a PAGE ruler prestained protein ladder (Bio-Rad, 1610374) and stained with Coomassie (Bio-Rad, 161-0786).
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