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This review considers available data on the composition of the extracellular matrix (ECM) in echinoderms. The connective tissue in these animals has a rather complex organization. It includes a wide range of structural ECM proteins, as well as various proteases and their inhibitors. Members of almost all major groups of collagens, various glycoproteins, and proteoglycans have been found in echinoderms. There are enzymes for the synthesis of structural proteins and their modification by polysaccharides. However, the ECM of echinoderms substantially differs from that of vertebrates by the lack of elastin, fibronectins, tenascins, and some other glycoproteins and proteoglycans. Echinoderms have a wide variety of proteinases, with serine, cysteine, aspartic, and metal peptidases identified among them. Their active centers have a typical structure and can break down various ECM molecules. Echinoderms are also distinguished by a wide range of proteinase inhibitors. The complex ECM structure and the variety of intermolecular interactions evidently explain the complexity of the mechanisms responsible for variations in the mechanical properties of connective tissue in echinoderms. These mechanisms probably depend not only on the number of cross-links between the molecules, but also on the composition of ECM and the properties of its proteins.
collagen, glycoprotein, Extracellular Matrix Proteins, proteoglycan, QH301-705.5, echinoderms, Review, extracellular matrix (ECM), Extracellular Matrix, mutable collagenous tissue, Animals, Proteoglycans, Collagen, Biology (General), Echinodermata, Glycoproteins
collagen, glycoprotein, Extracellular Matrix Proteins, proteoglycan, QH301-705.5, echinoderms, Review, extracellular matrix (ECM), Extracellular Matrix, mutable collagenous tissue, Animals, Proteoglycans, Collagen, Biology (General), Echinodermata, Glycoproteins
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