Abstract
Heparin was degraded to oligosaccharides by an endoglycosidase present in rat liver lysosomes. Inorganic sulfate equivalent to approximately one sulfamide bond cleaved per heparin chain was also released in incubations of N-[ 35S]heparin with crude lysosomal preparations. There was no evidence of exoglycosidase or further sulfamidase activity although oligosaccharides approaching the size of tetrasaccharide were produced. The endoglycosidase has a broad pH-dependence with optimum activity observed at pH 4.4 and intermediate activity at pH 5.5 and 3.8.
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