De-mannosylation of phosphorylated N-glycans
First Claim
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1. A method for demannosylating phosphorylated N-glycans on a glycoprotein, said method comprising contacting in vitro a recombinant glycoprotein comprising a terminal alpha-1,2 mannose linkage in which the underlying mannose is phosphorylated with a mannosidase that hydrolyzes a terminal alpha-1,2 mannose linkage when the underlying mannose is phosphorylated, wherein the contacting results in hydrolysis of the terminal alpha-1,2 mannose linkage, to produce a demannosylated glycoprotein, wherein the mannosidase is:
- (a) a wild-type glycoside hydrolase (GH)92 family polypeptide or a wild-type GH47 family polypeptide;
(b) a deletion variant that is the polypeptide of (a) but lacks up to twenty amino acid segments, each segment consisting of two amino acids;
(c) a deletion variant that is the polypeptide of (a) or the variant of (b) but lacks up to twenty single, non-contiguous amino acids of the polypeptide of (a) or the variant of (b);
or(d) a substitution variant that is the polypeptide of (a), the variant of (b), or the variant of (c), but with no more than 10 conservative substitutions.
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Abstract
Methods for demannosylating phosphorylated N-glycans on a glycoprotein are described that use a mannosidase capable of hydrolyzing a terminal alpha-1,2 mannose linkage when the underlying mannose is phosphorylated.
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13 Claims
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1. A method for demannosylating phosphorylated N-glycans on a glycoprotein, said method comprising contacting in vitro a recombinant glycoprotein comprising a terminal alpha-1,2 mannose linkage in which the underlying mannose is phosphorylated with a mannosidase that hydrolyzes a terminal alpha-1,2 mannose linkage when the underlying mannose is phosphorylated, wherein the contacting results in hydrolysis of the terminal alpha-1,2 mannose linkage, to produce a demannosylated glycoprotein, wherein the mannosidase is:
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(a) a wild-type glycoside hydrolase (GH)92 family polypeptide or a wild-type GH47 family polypeptide; (b) a deletion variant that is the polypeptide of (a) but lacks up to twenty amino acid segments, each segment consisting of two amino acids; (c) a deletion variant that is the polypeptide of (a) or the variant of (b) but lacks up to twenty single, non-contiguous amino acids of the polypeptide of (a) or the variant of (b);
or(d) a substitution variant that is the polypeptide of (a), the variant of (b), or the variant of (c), but with no more than 10 conservative substitutions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification