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Dermatan 4-O-sulfotransferase 1 is pivotal in the formation of iduronic acid blocks in dermatan sulfate.
MedLine Citation:
PMID:  19661164     Owner:  NLM     Status:  In-Process    
Chondroitin/dermatan sulfate is a highly complex linear polysaccharide ubiquitously found in the extracellular matrix and at the cell surface. Several of its functions, such as binding to growth factors, are mediated by domains composed of alternating iduronic acid and 4-O-sulfated N-acetylgalactosamine residues, named 4-O-sulfated iduronic acid blocks. These domains are generated by the action of two DS-epimerases, which convert D-glucuronic acid into its epimer L-iduronic acid, in close connection with 4-O-sulfation. In this study, dermatan sulfate structure was evaluated after downregulating or increasing dermatan 4-O-sulfotransferase 1 (D4ST-1) expression. siRNA-mediated downregulation of D4ST-1 in primary human lung fibroblasts led to a drastic specific reduction of iduronic acid blocks. No change of epimerase activity was found, indicating that the influence of D4ST-1 on epimerization is not due to an altered expression level of the DS-epimerases. Analysis of the dermatan sulfate chains showed that D4ST-1 is essential for the biosynthesis of the disulfated structure iduronic acid-2-O-sulfate-N-acetylgalactosamine-4-O-sulfate, thus confirmed to be strictly connected with the iduronic acid blocks. Also the biologically important residue hexuronic acid-N-acetylgalactosamine-4,6-O-disulfate considerably decreased after D4ST-1 downregulation. In conclusion, D4ST-1 is a key enzyme and is indispensable in the formation of important functional domains in dermatan sulfate and cannot be compensated by other 4-O-sulfotransferases.
Benny Pacheco; Marco Maccarana; Anders Malmström
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-08-06
Journal Detail:
Title:  Glycobiology     Volume:  19     ISSN:  1460-2423     ISO Abbreviation:  Glycobiology     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-10-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9104124     Medline TA:  Glycobiology     Country:  England    
Other Details:
Languages:  eng     Pagination:  1197-203     Citation Subset:  IM    
Department of Experimental Medical Science, Lund University, Lund, Sweden.
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