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• W602854908 abstract "In the extracellular space, many specialized proteins are located to support cells and to mediate cell-cell signalling. One class of such molecules is heparan sulfate (HS) proteoglycans, which are proteins with different properties and locations but all of them decorated with long unbranched HS polysaccharide chains. During biosynthesis the HS chains are modified by sulfation and a C5-epimerase converts some glucuronic acid residues to iduronic acid. The patterns of the modifications vary distinctly between tissues and developing stages and give HS chains different affinity for biologically important proteins. Thus, the regulation of HS biosynthesis is likely to influence a wide variety of biological events.This thesis focuses on the biosynthesis of HS in animals with targeted disruptions in genes important for HS production. The N-deacetylase N-sulfotransferase (NDST) is a key enzyme in HS biosynthesis, directing other modifications. We show that NDST isoforms have very different roles in HS biosynthesis. Inactivation of NDST1 affects HS biosynthesis in all tissues. In embryonic liver HS from NDST1-/- mice the N-sulfation was decresed with twothirds, while the absence of NDST2 did not affect HS structure. In the absence of NDST1 in the liver, however, NDST2 is active in HS N-sulfation. In a study of embryonic stem cells lacking both NDST1 and NDST2, no N-sulfate groups could be detected. 6-O-sulfate groups were, however, still present at half of its normal level. This was an unexpected finding since 6-O-sulfotransferases have been thought to be strictly dependent on N-sulfate groups for substrate recognition.By adapting an automated method for HS analysis to mammalian tissues, we could extend our analyses to more tissues and other transgene models. We also developed a protocol to create a sensitive “fingerprint” of HS structure. With these methods we could determine the individual HS structure of different mouse tissues." @default.
• W602854908 created "2016-06-24" @default.
• W602854908 creator A5040775381 @default.
• W602854908 date "2004-01-01" @default.
• W602854908 modified "2023-09-24" @default.
• W602854908 title "Heparan Sulfate Biosynthesis – Clues from Knockout Mice" @default.
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