Müller WE, Zahn RK, Arendes J, Kurelec B, Steffen R, Müller I. Aggregation of sponge cells. XX. Self-aggregation of the circular proteid particle.
BIOCHIMICA ET BIOPHYSICA ACTA 1979;
551:363-7. [PMID:
420839 DOI:
10.1016/0005-2736(89)90012-6]
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Abstract
In the extracellular space of the tissue of the sponge Geodia cydonium, circular proteid particles are found which carry as subunits the aggregation factor and a series of glycosyltransferases. Using the technique of velocity sucrose gradient centrifugation, the sedimentation coefficient (S020,w) of the particle-monosomes was determined to be 90. By means of the Svedberg equation a molecular weight of 1.3 . 10(8) daltons could be estimated. The monosomes aggregate in the presence of Ca2+ to higher complexes via disomes, trisomes, and pentasomes. The complexes can be redissociated by dodecyl sulfate but not by EDTA. During the Ca2+-mediated self-aggregation, the particles lose their biological activity with respect to their aggregation promoting function.
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