Protocol for detecting LDLR on the cell surface of primary mouse hepatocytes using cell-surface biotinylation

Here, we present a protocol for selective biotinylation, solubilization, and enrichment of plasma membrane proteins from primary mouse hepatocytes. We describe steps for injecting C57/BL6 mice via the tail vein with adeno-associated virus subtype 8 (AAV8) to specifically knock down the target gene in hepatocytes. We then detail procedures for labeling surface proteins with EZ-LINK Sulfo-NHS-LC-Biotin and enriching low-density lipoprotein receptor (LDLR) with immunoprecipitation. Finally, we outline procedures for assessing surface LDLR with streptavidin-HRP. For complete details on the use and execution of this protocol, please refer to Ma et al.¹