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We report here an improved method for analyzing protein surface expression utilizing a cold-adapted trypsin. Preservation of activity of the enzyme at 0-4°C permits modification of the protease method of surface analysis to temperatures at which trafficking of mammalian plasmalemmal proteins is blocked. This is an important advantage over established trypsin-cleavage protocols. Moreover, the method is less time-consuming than surface biotinylation.

Cold-adapted protease enables quantitation of surface proteins in the absence of membrane trafficking