Dermatan Sulfate Epimerases (DSE, DSEL)

Reference work entry


Chondroitin/dermatan sulfate (CS/DS) chains are polysaccharides that are attached to approximately 30 different core proteins, thus giving rise to different CS/DS proteoglycans. The polysaccharide chain is composed of a repeating disaccharide unit [glucuronic (GlcA) or iduronic acid (IdoA) – N-acetyl-galactosamine (GalNAc)]n, where n varies in most cases between 20 and 100 (Fig. 83.1). Dermatan sulfate epimerase 1 and 2 epimerize glucuronic acid to iduronic acid (Maccarana et al. 2006; Pacheco et al. 2009c). This conversion in most cases is not quantitative, meaning that not all available glucuronic acids in a chain are converted. Therefore, a chain has a mixed content of glucuronic and iduronic acid. In the literature a single iduronic acid is sufficient to name the chain DS. To identify the hybrid nature of the GlcA/IdoA chain the term CS/DS is preferred. After epimerization of the chain, the C2 hydroxyl group of GlcA/IdoA and the C4 and/or C6 hydroxyl group of GalNAc can be sulfated, giving rise to seven different disaccharide structures (Kusche-Gullberg and Kjellen 2003). The combination of these disaccharides forms different protein-binding domains, which are generally 2–4 disaccharides long. It is evident that the structural variability of the chain makes CS/DS an informational rich molecule, and it has diverse biological functions (Trowbridge and Gallo 2002; Malmstrom et al. 2012). Iduronic acid in CS/DS is present in vertebrates, e.g., Xenopus (Yamada et al. 2009) and mammals, as well as in some invertebrate phyla of lower organisms such as Echinodermata, e.g., sea urchin and sea cucumber; Tunicata, e.g., ascidian; and Mollusca, e.g., squid (Yamada et al. 2011). It is absent in C. elegans and the fruit fly. DS-epi1 and 2 are expressed in vertebrates.


Hepatocyte Growth Factor Glucuronic Acid Dermatan Sulfate Tritiated Water Squamous Cell Carcinoma Cell Line 
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Copyright information

© Springer Japan 2014

Authors and Affiliations

  1. 1.Department of Experimental Medical ScienceLund UniversityLundSweden

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