Aspects on dermatan sulfate metabolism

Research output: ThesisDoctoral Thesis (compilation)

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Aspects on dermatan sulfate metabolism. / Eklund, Erik.

2001. 180 p.

Research output: ThesisDoctoral Thesis (compilation)

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Eklund, E 2001, 'Aspects on dermatan sulfate metabolism', Doctor, Department of Experimental Medical Science.

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TY - THES

T1 - Aspects on dermatan sulfate metabolism

AU - Eklund, Erik

N1 - Defence details Date: 2001-10-12 Time: 09:00 Place: GK-salen, BMC, Sölvegatan 19, Lund External reviewer(s) Name: Lindahl, Ulf Title: Professor Affiliation: Uppsala, Sweden --- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Cell and Matrix Biology (LUR000002), Matrix biology (013212025)

PY - 2001

Y1 - 2001

N2 - The functions of proteoglycans often depend on the fine structure of the covalently attached glycosaminoglycan (GAG) side-chains. The process leading to the mature GAG is complex and involves a multitude of different enzymatic steps. GAG synthesis is initiated on serine residues, where a xylose residue is transferred to the protein core, a reaction catalyzed by a xylosyltransferase (XT). It thereafter continues with the additions of two galactose residues and one glucuronic acid. These four sugar units comprise the so called link region on which either chondroitin sulfate/dermatan sulfate (CS/DS) or heparan sulfate/heparin are synthesized. This thesis focuses on the metabolism of (CS/DS). In three of the papers different aspects of the biosynthesis are investigated. The first one deals with questions concerning the initiation of GAG synthesis and the role of the core protein thereof. The second paper address questions concerning the regulation of the enzyme responsible for DS formation, the C-5 epimerase. The effect of different cytokines/growth factors on the enzyme activity was investigated and correlations to the structure of the GAG chain are made. In the third paper the delicate interplay of 4-O-sulfation and epimerization was thoroughly investigated and it is suggested that epimerization enhance the possibilities to 4-O-sulfation. Another way to regulate the functions of GAG chains in the tissues is to control their degradation. In the last paper a novel CS/DS degrading enzyme, functioning in the extracellular environment, is described.

AB - The functions of proteoglycans often depend on the fine structure of the covalently attached glycosaminoglycan (GAG) side-chains. The process leading to the mature GAG is complex and involves a multitude of different enzymatic steps. GAG synthesis is initiated on serine residues, where a xylose residue is transferred to the protein core, a reaction catalyzed by a xylosyltransferase (XT). It thereafter continues with the additions of two galactose residues and one glucuronic acid. These four sugar units comprise the so called link region on which either chondroitin sulfate/dermatan sulfate (CS/DS) or heparan sulfate/heparin are synthesized. This thesis focuses on the metabolism of (CS/DS). In three of the papers different aspects of the biosynthesis are investigated. The first one deals with questions concerning the initiation of GAG synthesis and the role of the core protein thereof. The second paper address questions concerning the regulation of the enzyme responsible for DS formation, the C-5 epimerase. The effect of different cytokines/growth factors on the enzyme activity was investigated and correlations to the structure of the GAG chain are made. In the third paper the delicate interplay of 4-O-sulfation and epimerization was thoroughly investigated and it is suggested that epimerization enhance the possibilities to 4-O-sulfation. Another way to regulate the functions of GAG chains in the tissues is to control their degradation. In the last paper a novel CS/DS degrading enzyme, functioning in the extracellular environment, is described.

KW - Klinisk biologi

KW - Clinical biology

KW - iduronic acid

KW - galactosaminoglycan

KW - Dermatan sulfate

KW - biosynthesis

M3 - Doctoral Thesis (compilation)

SN - 91-628-4947-6

ER -