The major soluble 19.6 kDa protein of the organic shell matrix of the freshwater snail Biomphalaria glabrata is an N-glycosylated dermatopontin

The major Biomphalaria glabrata shell matrix protein of 19.6 kDa was isolated by preparative electrophoresis and sequenced. The sequence of 148 amino acids showed 32% sequence identity to mammalian dermatopontin sequences and 34–37% identity to two invertebrate dermatopontins described previously. A...

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Veröffentlicht in:Biochimica et biophysica acta 2003-08, Vol.1650 (1), p.92-98
Hauptverfasser: Marxen, Julia C., Nimtz, Manfred, Becker, Wilhelm, Mann, Karlheinz
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Nimtz, Manfred
Becker, Wilhelm
Mann, Karlheinz
description The major Biomphalaria glabrata shell matrix protein of 19.6 kDa was isolated by preparative electrophoresis and sequenced. The sequence of 148 amino acids showed 32% sequence identity to mammalian dermatopontin sequences and 34–37% identity to two invertebrate dermatopontins described previously. A unique feature of the shell matrix dermatopontin was the presence of a single N-glycosylation consensus sequence, the asparagine of which was completely modified with a pentasaccharide. Sequence analysis of this short N-glycan by mass spectrometry and carbohydrate composition analysis indicated that it was the ubiquitous N-glycan core oligosaccharide with the exception that the terminal mannoses were 3- O-methylated. Dermatopontin is widespread in mammalian extracellular matrices, including the matrix of biominerals such as bone and teeth. Its occurrence in an invertebrate biomineral indicates that such phylogenetically distant biomineral-forming systems as vertebrate bone and mollusk shell share components which have undergone surprisingly few changes during a long evolution.
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Amino Acid Sequence
Animals
Biomineralization
Biomphalaria - metabolism
Carrier Proteins - isolation & purification
Carrier Proteins - metabolism
Cell Adhesion Molecules - isolation & purification
Cell Adhesion Molecules - metabolism
Chondroitin Sulfate Proteoglycans
Dermatopontin
Electrophoresis, Polyacrylamide Gel
Extracellular Matrix Proteins
Freshwater
Glycosylation
Humans
Molecular Sequence Data
Mollusk shell
N-glycan
title The major soluble 19.6 kDa protein of the organic shell matrix of the freshwater snail Biomphalaria glabrata is an N-glycosylated dermatopontin
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