Methods and compositions for detecting and modulating O-glycosylation
First Claim
1. An isolated molecule comprising a cleavable detectably labeled polypeptide substrate havinga) an O-glycosylation site andb) a specific protease cleavage site positioned in the polypeptide such that the rate of cleavage by a specific protease at the specific protease cleavage site is different when the polypeptide is glycosylated at the O-glycosylation site than when the polypeptide is not glycosylated at the O-glycosylation site, wherein the detectable label is positioned in the polypeptide such that a change in the detectable label identifies cleavage of the polypeptide by the specific protease at the specific protease cleavage site.
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Abstract
The invention relates to methods and products for modulating glycosylation of proteins. The invention is useful for identifying therapeutic compounds to treat glycosylation-associated disorders such as neurodegeneration, diabetes, including complications of diabetes such as insulin resistance, nephropathy, microvascular damage, and endothelial dysfunction. The invention is also useful for identifying therapeutic compounds to treat de-glycosylation-associated disorders such as ischemic damage and traumatic injury. The invention also relates in part to assays that are useful for identifying and testing candidate compounds for modulating glycosylation of proteins and also relates in part to compounds to treat glycosylation-associated diseases and disorders.
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19 Claims
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1. An isolated molecule comprising a cleavable detectably labeled polypeptide substrate having
a) an O-glycosylation site and b) a specific protease cleavage site positioned in the polypeptide such that the rate of cleavage by a specific protease at the specific protease cleavage site is different when the polypeptide is glycosylated at the O-glycosylation site than when the polypeptide is not glycosylated at the O-glycosylation site, wherein the detectable label is positioned in the polypeptide such that a change in the detectable label identifies cleavage of the polypeptide by the specific protease at the specific protease cleavage site.
Specification