Glycosaminoglycan Degradation Enzymes

Glycosaminoglycan (GAG) degradation enzymes are a group of lysosomal hydrolases and lyases responsible for the stepwise breakdown of glycosaminoglycans—long, linear, negatively charged polysaccharides found in the extracellular matrix and on cell surfaces. GAGs include heparan sulfate, heparin, chondroitin sulfate, dermatan sulfate, keratan sulfate, and hyaluronan. These enzymes are essential for normal cellular turnover of GAGs and play critical roles in tissue remodeling, signaling regulation, and homeostasis. Degradation primarily occurs in lysosomes after endocytosis or phagocytosis of proteoglycans/GAGs. Inherited defects in these enzymes result in mucopolysaccharidoses—a group of lysosomal storage disorders characterized by accumulation of undegraded GAG fragments. Understanding these enzymes' activity is vital not only for basic biology but also for therapeutic strategies targeting lysosomal storage diseases or modulating tissue repair/regeneration through controlled ECM remodeling.

Hydrolytic or eliminative cleavage of glycosaminoglycans