Supramolecular structure of a new family of circular proteoglycans mediating cell adhesion in sponges

Jarchow J, Fritz J, Anselmetti D, Calabro A, Hascall VC, Gerosa D, Burger MM, Fernandez-Busquets X (2000)
Journal of structural biology 132(2): 95-105.

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Aggregation factors are the molecules responsible for species-specific cell adhesion in sponges. Here, we present the structure of the aggregation factor from the marine sponge Microciona prolifera, which constitutes the first description of a circular proteoglycan. We have analyzed chemically dissociated and enzymatically digested aggregation factor with atomic force microscopy, agarose gel electrophoresis, and Western blots using antibodies against the protein and carbohydrate moieties. Twenty units from each of two N-glycosylated proteins, MAFp3 and MAFp4, form the central ring and radiating arms, respectively, stabilized by a hyaluronidase-sensitive component. MAFp3 carries a 200-kDa glycan involved in homologous self-interactions between aggregation factor molecules, whereas MAFp4 carries a 6-kDa glycan that binds cell surface receptors. A 68-kDa lectin found in cell membranes of several sponge species binds the aggregation factor and its protein-free glycans, as well as chondroitin sulfate and hyaluronan. Here, we show that despite their lack of clear sequence homologies with other known proteoglycan structures, the protein and carbohydrate components of sponge aggregation factors assemble to form a supramolecular complex remarkably similar to classical proteoglycans.
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Jarchow J, Fritz J, Anselmetti D, et al. Supramolecular structure of a new family of circular proteoglycans mediating cell adhesion in sponges. Journal of structural biology. 2000;132(2):95-105.
Jarchow, J., Fritz, J., Anselmetti, D., Calabro, A., Hascall, V. C., Gerosa, D., Burger, M. M., et al. (2000). Supramolecular structure of a new family of circular proteoglycans mediating cell adhesion in sponges. Journal of structural biology, 132(2), 95-105.
Jarchow, J., Fritz, J., Anselmetti, D., Calabro, A., Hascall, V. C., Gerosa, D., Burger, M. M., and Fernandez-Busquets, X. (2000). Supramolecular structure of a new family of circular proteoglycans mediating cell adhesion in sponges. Journal of structural biology 132, 95-105.
Jarchow, J., et al., 2000. Supramolecular structure of a new family of circular proteoglycans mediating cell adhesion in sponges. Journal of structural biology, 132(2), p 95-105.
J. Jarchow, et al., “Supramolecular structure of a new family of circular proteoglycans mediating cell adhesion in sponges”, Journal of structural biology, vol. 132, 2000, pp. 95-105.
Jarchow, J., Fritz, J., Anselmetti, D., Calabro, A., Hascall, V.C., Gerosa, D., Burger, M.M., Fernandez-Busquets, X.: Supramolecular structure of a new family of circular proteoglycans mediating cell adhesion in sponges. Journal of structural biology. 132, 95-105 (2000).
Jarchow, Janina, Fritz, Jürgen, Anselmetti, Dario, Calabro, Anthony, Hascall, Vincent C., Gerosa, Daniela, Burger, Max M., and Fernandez-Busquets, Xavier. “Supramolecular structure of a new family of circular proteoglycans mediating cell adhesion in sponges”. Journal of structural biology 132.2 (2000): 95-105.
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