Isolation and characterization of the glycosaminoglycan component of rabbit thrombomodulin proteoglycan

Previous studies on rabbit thrombomodulin (TM) revealed that certain anticoagulant activities expressed by TM depend on the presence of an acidic domain tentatively identified as a sulfated galactosaminoglycan (Bourin, M.-C., Ohlin, A.-K., Lane, D., Stenflo, J., and Lindahl, U. (1988) J. Biol. Chem....

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Veröffentlicht in:The Journal of biological chemistry 1990-09, Vol.265 (26), p.15424-15431
Hauptverfasser: Bourin, M-C, Lundgren-Aakerlund, E, Lindahl, U
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creator Bourin, M-C
Lundgren-Aakerlund, E
Lindahl, U
description Previous studies on rabbit thrombomodulin (TM) revealed that certain anticoagulant activities expressed by TM depend on the presence of an acidic domain tentatively identified as a sulfated galactosaminoglycan (Bourin, M.-C., Ohlin, A.-K., Lane, D., Stenflo, J., and Lindahl, U. (1988) J. Biol. Chem. 263, 8044-8052). The glycan was released by alkaline beta-elimination, isolated by ion-exchange chromatography, and radiolabeled by partial N-deacetylation (hydrazinolysis) followed by re-N-[3H]acetylation. The labeled product behaved like standard chondroitin sulfate on ion-exchange chromatography, exhibited a Mr of 10-12 x 10(3) on gel chromatography, and was susceptible to degradation by chondroitinase and testicular hyaluronidase. The major labeled degradation products following digestion of the glycosaminoglycan with chondroitinase were identified, depending on the incubation conditions, either as 4/6-mono-O-sulfated, 4,5-unsaturated disaccharides (delta HexA-GalNAc(S] and N-acetylgalactosamine 4,6-di-O-sulfate (GalcNAc (diS], the latter component accounting for approximately 25% of the total label, or as a major fraction of labeled trisaccharide, with the predominant structure GalNAc(diS)-GlcA-GalNAc(diS). The terminal GalNAc(diS) unit (not substituted at C3) was shown to be more susceptible to N-deacetylation during hydrazinolysis than were the internal GalNAc units (substituted at C3), and thus was more extensively labeled, resulting in over-representation of this unit. It is concluded that rabbit TM is a chondroitin sulfate proteoglycan, which carries a single glycan side chain characterized by an unusual accumulation of sulfate groups at the nonreducing terminus. Metabolically 35S-labeled TM was isolated from cultured rabbit heart endothelial cells and characterized as a chondroitin sulfate proteoglycan which accounted for 1-2% of the total 35S-labeled cell-associated macromolecules. The isolated chondroitin sulfate showed weaker antithrombin-dependent anticoagulant activity, on a molar basis, than the intact TM proteoglycan. The anticoagulant action of TM thus depends on a unique form of functional collaboration between the different constituents of a glycoconjugate.
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(1988) J. Biol. Chem. 263, 8044-8052). The glycan was released by alkaline beta-elimination, isolated by ion-exchange chromatography, and radiolabeled by partial N-deacetylation (hydrazinolysis) followed by re-N-[3H]acetylation. The labeled product behaved like standard chondroitin sulfate on ion-exchange chromatography, exhibited a Mr of 10-12 x 10(3) on gel chromatography, and was susceptible to degradation by chondroitinase and testicular hyaluronidase. The major labeled degradation products following digestion of the glycosaminoglycan with chondroitinase were identified, depending on the incubation conditions, either as 4/6-mono-O-sulfated, 4,5-unsaturated disaccharides (delta HexA-GalNAc(S] and N-acetylgalactosamine 4,6-di-O-sulfate (GalcNAc (diS], the latter component accounting for approximately 25% of the total label, or as a major fraction of labeled trisaccharide, with the predominant structure GalNAc(diS)-GlcA-GalNAc(diS). The terminal GalNAc(diS) unit (not substituted at C3) was shown to be more susceptible to N-deacetylation during hydrazinolysis than were the internal GalNAc units (substituted at C3), and thus was more extensively labeled, resulting in over-representation of this unit. It is concluded that rabbit TM is a chondroitin sulfate proteoglycan, which carries a single glycan side chain characterized by an unusual accumulation of sulfate groups at the nonreducing terminus. Metabolically 35S-labeled TM was isolated from cultured rabbit heart endothelial cells and characterized as a chondroitin sulfate proteoglycan which accounted for 1-2% of the total 35S-labeled cell-associated macromolecules. The isolated chondroitin sulfate showed weaker antithrombin-dependent anticoagulant activity, on a molar basis, than the intact TM proteoglycan. 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(1988) J. Biol. Chem. 263, 8044-8052). The glycan was released by alkaline beta-elimination, isolated by ion-exchange chromatography, and radiolabeled by partial N-deacetylation (hydrazinolysis) followed by re-N-[3H]acetylation. The labeled product behaved like standard chondroitin sulfate on ion-exchange chromatography, exhibited a Mr of 10-12 x 10(3) on gel chromatography, and was susceptible to degradation by chondroitinase and testicular hyaluronidase. The major labeled degradation products following digestion of the glycosaminoglycan with chondroitinase were identified, depending on the incubation conditions, either as 4/6-mono-O-sulfated, 4,5-unsaturated disaccharides (delta HexA-GalNAc(S] and N-acetylgalactosamine 4,6-di-O-sulfate (GalcNAc (diS], the latter component accounting for approximately 25% of the total label, or as a major fraction of labeled trisaccharide, with the predominant structure GalNAc(diS)-GlcA-GalNAc(diS). The terminal GalNAc(diS) unit (not substituted at C3) was shown to be more susceptible to N-deacetylation during hydrazinolysis than were the internal GalNAc units (substituted at C3), and thus was more extensively labeled, resulting in over-representation of this unit. It is concluded that rabbit TM is a chondroitin sulfate proteoglycan, which carries a single glycan side chain characterized by an unusual accumulation of sulfate groups at the nonreducing terminus. Metabolically 35S-labeled TM was isolated from cultured rabbit heart endothelial cells and characterized as a chondroitin sulfate proteoglycan which accounted for 1-2% of the total 35S-labeled cell-associated macromolecules. The isolated chondroitin sulfate showed weaker antithrombin-dependent anticoagulant activity, on a molar basis, than the intact TM proteoglycan. 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Psychology</topic><topic>GLYCOPROTEINS</topic><topic>Glycosaminoglycans - biosynthesis</topic><topic>Glycosaminoglycans - isolation &amp; purification</topic><topic>Glycosaminoglycans - metabolism</topic><topic>ION EXCHANGE CHROMATOGRAPHY</topic><topic>ISOTOPE APPLICATIONS</topic><topic>ISOTOPE DILUTION</topic><topic>ISOTOPES</topic><topic>LIGHT NUCLEI</topic><topic>LYASES</topic><topic>MAMMALS</topic><topic>NUCLEI</topic><topic>ORGANIC COMPOUNDS</topic><topic>OXYGEN COMPOUNDS</topic><topic>PROTEINS</topic><topic>proteoglycans</topic><topic>RABBITS</topic><topic>Radioisotope Dilution Technique</topic><topic>RADIOISOTOPES</topic><topic>Receptors, Cell Surface - biosynthesis</topic><topic>Receptors, Cell Surface - isolation &amp; purification</topic><topic>Receptors, Cell Surface - metabolism</topic><topic>Receptors, Thrombin</topic><topic>SEPARATION PROCESSES</topic><topic>SULFATES</topic><topic>Sulfates - metabolism</topic><topic>SULFUR 35</topic><topic>SULFUR COMPOUNDS</topic><topic>SULFUR ISOTOPES</topic><topic>Sulfur Radioisotopes</topic><topic>Thrombin - metabolism</topic><topic>TISSUES</topic><topic>TRACER TECHNIQUES</topic><topic>Tritium</topic><topic>VERTEBRATES</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bourin, M-C</creatorcontrib><creatorcontrib>Lundgren-Aakerlund, E</creatorcontrib><creatorcontrib>Lindahl, U</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biochemistry Abstracts 3</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>MEDLINE - Academic</collection><collection>OSTI.GOV</collection><jtitle>The Journal of biological chemistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bourin, M-C</au><au>Lundgren-Aakerlund, E</au><au>Lindahl, U</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Isolation and characterization of the glycosaminoglycan component of rabbit thrombomodulin proteoglycan</atitle><jtitle>The Journal of biological chemistry</jtitle><addtitle>J Biol Chem</addtitle><date>1990-09-15</date><risdate>1990</risdate><volume>265</volume><issue>26</issue><spage>15424</spage><epage>15431</epage><pages>15424-15431</pages><issn>0021-9258</issn><eissn>1083-351X</eissn><coden>JBCHA3</coden><abstract>Previous studies on rabbit thrombomodulin (TM) revealed that certain anticoagulant activities expressed by TM depend on the presence of an acidic domain tentatively identified as a sulfated galactosaminoglycan (Bourin, M.-C., Ohlin, A.-K., Lane, D., Stenflo, J., and Lindahl, U. (1988) J. Biol. Chem. 263, 8044-8052). The glycan was released by alkaline beta-elimination, isolated by ion-exchange chromatography, and radiolabeled by partial N-deacetylation (hydrazinolysis) followed by re-N-[3H]acetylation. The labeled product behaved like standard chondroitin sulfate on ion-exchange chromatography, exhibited a Mr of 10-12 x 10(3) on gel chromatography, and was susceptible to degradation by chondroitinase and testicular hyaluronidase. The major labeled degradation products following digestion of the glycosaminoglycan with chondroitinase were identified, depending on the incubation conditions, either as 4/6-mono-O-sulfated, 4,5-unsaturated disaccharides (delta HexA-GalNAc(S] and N-acetylgalactosamine 4,6-di-O-sulfate (GalcNAc (diS], the latter component accounting for approximately 25% of the total label, or as a major fraction of labeled trisaccharide, with the predominant structure GalNAc(diS)-GlcA-GalNAc(diS). The terminal GalNAc(diS) unit (not substituted at C3) was shown to be more susceptible to N-deacetylation during hydrazinolysis than were the internal GalNAc units (substituted at C3), and thus was more extensively labeled, resulting in over-representation of this unit. It is concluded that rabbit TM is a chondroitin sulfate proteoglycan, which carries a single glycan side chain characterized by an unusual accumulation of sulfate groups at the nonreducing terminus. Metabolically 35S-labeled TM was isolated from cultured rabbit heart endothelial cells and characterized as a chondroitin sulfate proteoglycan which accounted for 1-2% of the total 35S-labeled cell-associated macromolecules. The isolated chondroitin sulfate showed weaker antithrombin-dependent anticoagulant activity, on a molar basis, than the intact TM proteoglycan. The anticoagulant action of TM thus depends on a unique form of functional collaboration between the different constituents of a glycoconjugate.</abstract><cop>Bethesda, MD</cop><pub>American Society for Biochemistry and Molecular Biology</pub><pmid>2168413</pmid><doi>10.1016/S0021-9258(18)55414-4</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record>
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subjects 550201 - Biochemistry- Tracer Techniques
ACETYLATION
ACYLATION
Analytical, structural and metabolic biochemistry
ANIMAL TISSUES
ANIMALS
BASIC BIOLOGICAL SCIENCES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
Biological and medical sciences
BODY
CELL CULTURES
Cells, Cultured
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
Chondroitin Lyases
chondroitin sulfate
CHROMATOGRAPHY
Chromatography, Gel
Chromatography, Ion Exchange
DAYS LIVING RADIOISOTOPES
Electrophoresis, Paper
ENDOTHELIUM
Endothelium - metabolism
ENZYMES
EVEN-ODD NUCLEI
Fundamental and applied biological sciences. Psychology
GLYCOPROTEINS
Glycosaminoglycans - biosynthesis
Glycosaminoglycans - isolation & purification
Glycosaminoglycans - metabolism
ION EXCHANGE CHROMATOGRAPHY
ISOTOPE APPLICATIONS
ISOTOPE DILUTION
ISOTOPES
LIGHT NUCLEI
LYASES
MAMMALS
NUCLEI
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PROTEINS
proteoglycans
RABBITS
Radioisotope Dilution Technique
RADIOISOTOPES
Receptors, Cell Surface - biosynthesis
Receptors, Cell Surface - isolation & purification
Receptors, Cell Surface - metabolism
Receptors, Thrombin
SEPARATION PROCESSES
SULFATES
Sulfates - metabolism
SULFUR 35
SULFUR COMPOUNDS
SULFUR ISOTOPES
Sulfur Radioisotopes
Thrombin - metabolism
TISSUES
TRACER TECHNIQUES
Tritium
VERTEBRATES
title Isolation and characterization of the glycosaminoglycan component of rabbit thrombomodulin proteoglycan
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