Molluscs Littorina

The ot-L-fucosidase from the marine mollusc Littorina littorea has been purified only one form was detectable by isoelectric focusing at pH 5.4. L-Fucose was a competitive inhibitor and Hg + ion was a non-competitive inhibitor of the enzyme (mol. wt. 2.2 x 10 , pH optimum 6.5, Km 3.0 x 10 M and Fmax 2.6 (xmol mg min for 4-nitrophenyl a-L-fucopyranoside). The enzyme proved to be a glycoprotein containing D-glucose (7.4), D-galactose (2.2), D-mannose (1.8), and 2-amino-2-deoxy-D-hexose (2.2%). 

Ackman, R.G. and Hooper, S.N. (1973b) Non-methylene-interrupted fatty acids in lipids of shallow-water marine invertebrates a comparison of two molluscs Littorina littorea and Lunatia triseriata) with the sand shrimp (Crangon septemspinosus). Comp. Biochem. Physiol. 46B 153-165. 

An agarase has been isolated from the mollusc Littorina mandshurica by affinity chromatography on agarose. The preparation was free from endogenous cellulase and xylanase activities. 

The half-time persistence (Tb 1/2) of zinc in whole molluscs is extremely variable, and reported to range from 4 days in the common mussel (Mytilus edulis) to 650 days in the duck mussel (Anodonta nutalliana) intermediate values were 23 to 40 days in limpet (Littorina irroratea), 76 days in the California mussel (Mytilus californianus), and 300 days in the Pacific oyster (NAS 1979). Zinc persistence in selected organs also shows considerable variability and may be significantly different from Tb 1/2 values seen in whole animal. For example, the Tb 1/2 of zinc in... 

De Wolf, H., de Coen, W, Backeljau, T, Blust, R. (2001). Intersex and sterility in the periwinkle Littorina littorea (Molluscs Gastropoda) along the Western Scheldt estuary, the Netherlands. Marine Environmental Research, 52,249-255. 

A. I. Usov, M. D. Martynova, and N. K. Kochetkov, Discovery of agarase in molluscs of the genus Littorina, Dokl. Acad. Nauk SSSR, 194 (1970) 455-457. 

Livingstone DR (1985) Responses of the detoxication/toxica tion enzyme systems of molluscs to organic pollutants and xenobiotics. Mar Pollut Bull 16 158-164 Livingstone DR (1987a) Seasonal responses to diesel oil and subsequent recovery of the cytochrome P-450 monooxygenase system in the common mussel, Mytilus edulis L., and the periwinkle, Littorina littorea L. Sci Total Environ 65 3-20... 

Moore MN, Pipe RK, Farrar SV (1982) Lysosomal and microsomal responses to environmental factors in Littorina littorea from Sullom Voe. Mar Pollut Bull 13 340-345 Moore MN, Mayernik JA, Giam CS (1985) Lysosomal responses to a polynuclear aromatic hydrocarbon in a marine snail effects of exposure to phenanthrene and recovery. Mar Env Res 17 230-233 Moore MN, Livingstone DR, Widdows J, Lowe DM, Pipe RK (1987) Molecular, cellular and physiological effects of oil-derived hydrocarbons on molluscs and their use in impact assessment. Phil Trans R Soc Lond B 316 603-623... 

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