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US 9,200,264 B2Granted
Manufacture of active highly phosphorylated human lysosomal sulfatase enzymes and uses thereof
AssigneeBiomarin Pharmaceutical Inc.
InventorsErno Pungor, Charles Hague, Zhi Chen
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Abstract
This invention provides compositions of active highly phosphorylated lysosomal sulfatase enzymes, their pharmaceutical compositions, methods of producing and purifying such lysosomal sulfatase enzymes and compositions and their use in the diagnosis, prophylaxis, or treatment of diseases and conditions, including particularly lysosomal storage diseases that are caused by, or associated with, a deficiency in the lysosomal sulfatase enzyme.
Claims12
A method for measuring the activity of a recombinant human lysosomal enzyme to degrade natural substrates, comprising:
- (a) culturing an isolated human cell deficient in the lysosomal enzyme under conditions in which natural substrates for the lysosomal enzyme accumulate;
- (b) contacting the cell with the lysosomal enzyme;
- (c) lysing the cell;
- (d) adding to the cell lysate an enzyme that (i) is specific for natural substrates and (ii) cleaves small oligosaccharides from the natural substrates;
- (e) labeling the small oligosaccharides with a detectable moiety;
- (f) optionally separating the labeled small oligosaccharides;
- (g) detecting the labeled small oligosaccharides;
- and
- (h) determining the activity of the lysosomal enzyme to degrade natural substrates by comparing (i) the amount of labeled small oligosaccharides from cells contacted with the lysosomal enzyme with (ii) the amount of labeled small oligosaccharides from cells not contacted with the lysosomal enzyme, wherein a reduction in (h)(i) as compared to (h)(ii) indicates the activity of the lysosomal enzyme to degrade natural substrates.
6 more elements
Dependencies are inferred from the claim text.