The tetrameric lysosomal enzyme beta-glucuronidase hydrolyses glucuronate from the HA tetrasaccharide (Oshima et al. 1987) resulting in the single sugars glucuronic acid and N-acetylglucosamine. These single sugars can exit the lysosome by an unknown mechanism. L-aspartic acid is an inhibitor of enzyme activity (Kreamer et al. 2001).
Kyle, JW, Gravel, RA, Powell, PP, Tropak, M, Sly, WS, Miller, RD, Grubb, JH, Oshima, A, Guise, KS, Hoffmann, JW
Siegel, FL, Kreamer, BL, Gourley, GR
beta-glucuronidase activity of GUSB tetramer [lysosomal lumen]
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