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Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Review
Metalloglycomics.
Metal Ions in Life Sciences 2018 Februrary 6
Glycosaminoglycans (GAGs) such as heparin and heparan sulfate (HS) are large complex carbohydrate molecules that bind to a wide variety of proteins and exercise important physiological and pathological processes. This chapter focuses on the concept of metalloglycomics and reviews the structure and conformation of GAGs and the role of various metal ions during the interaction of GAGs with their biological partners such as proteins and enzymes. The use of metal complexes in heparin analysis is discussed. Cleavage of heparan sulfate proteoglycans (HSPGs) by the enzyme heparanase modulates tumor-related events including angiogenesis, cell invasion, metastasis, and inflammation. HS is identified as a ligand receptor for polynuclear platinum complexes (PPCs) defining a new mechanism of cellular accumulation for platinum drugs with implications for tumor selectivity. The covalent and noncovalent interaction of PPCs with GAGs and the functional consequences of strong binding with HS are explained in detail. Sulfate cluster anchoring shields the sulfates from recognition by charged protein residues preventing the exercise of the HS-enzyme/protein function, such as growth factor recognition and the activity of heparanase on HS. The cellular consequences are inhibition of invasion and angiogenesis. Metalloglycomics is a potentially rich new area of endeavor for bioinorganic chemists to study the relevance of intrinsic metal ions in heparin/ HS-protein interactions and for development of new compounds for therapeutic, analytical, and imaging applications.
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