N-acetylglucosamine-1-phosphotransferase subunits alpha/beta (GNPTAB)

Catalyzes the formation of mannose 6-phosphate (M6P) mark on high mannose type oligosaccharides from the Golgi apparatus. M6P residues are needed to bind to the M6P receptors (MPR), which mediate the vesicular transport of lysosomal enzymes to the endosomal/prelysosomal compartment.

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