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Monitoring mammalian macroautophagic/autophagic flux is necessary in most autophagy studies but has generally been difficult to do. Here, we discuss our recent report of a HaloTag-based processing method that offers a straightforward readout for autophagic flux. We found that the self-labeling protein HaloTag becomes resistant to proteolysis when labeled with its ligand. Fusing HaloTag to an autophagy protein such as LC3 results in a reporter that is completely degraded when delivered into lysosomes but, when pulse-labeled with HaloTag ligand, releases free HaloTag ligand  when processed by lysosomal enzymes. The quantifiable amount of free HaloTag ligand , observed by immunoblotting or in-gel fluorescence detection, reflects autophagic flux. Besides being compatible with fluorescence microscopy and flow cytometry applications, this quantitative assay can be readily adapted to monitor most autophagy pathways or the autophagic degradation of a protein of interest.

A HaloTag-based reporter processing assay to monitor autophagic flux