Autophagosome content profiling using proximity biotinylation proteomics coupled to protease digestion in mammalian cells.

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The ascorbate peroxidase APEX2 is commonly used to study the neighborhood of a protein of interest by proximity-dependent biotinylation. Here, we describe a protocol for sample processing compatible with immunoblotting and mass spectrometry that is suitable to specifically map the content of autophagosomes and potentially other transient vesicles without the need of subcellular fractionation. By combining live-cell biotinylation with proteinase K digestion of cell homogenates, proteins enriched ...