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Collagen in the Spicule Organic Matrix of the Gorgonian Leptogorgia virgulata
Roni J. Kingsley, Mari Tsuzaki, Norimitsu Watabe and Gerald L. Mechanic
Vol. 179, No. 2 (Oct., 1990), pp. 207-213
Published by: Marine Biological Laboratory
Stable URL: http://www.jstor.org/stable/1541771
Page Count: 7
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Decalcification of the calcareous spicules from the gorgonian Leptogorgia virgulata reveals an organic matrix that may be divided into water insoluble and soluble fractions. The insoluble fraction displays characteristics typical of collagen, which is an unusual component of an invertebrate calcium carbonate structure. This matrix fraction exhibits a collagenous amino acid profile and behavior upon SDS-PAGE. Furthermore, the reducible crosslink, dihydroxylysinonorleucine (DHLNL), is detected in this fraction. The composition of the matrix varies seasonally; i.e., the collagenous composition is most prevalent in the summer. These results indicate that the insoluble matrix is a dynamic structure. Potential roles of this matrix in spicule calcification are discussed.
Biological Bulletin © 1990 Marine Biological Laboratory