Biotin-XX Tyramide Reagent

Biotin-XX-tyramide (biotin-XX-phenol; BxxP) is a membrane-impermeant variant of the proximity labeling probe biotin-tyramide (biotin-phenol; BP) th at corresponds to BP with a long and polar polyamide linker. Similary to BP, BxxP gives robust biotinylation with HRP and H2O2, but unlike BP, BxxP no longer enters cells, yielding selective labeling of cell surface, but not intracellular, proteins.