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Cadmium binding components of scallop pecten maximus digestive gland partial purification and characterization


Cadmium binding components of scallop pecten maximus digestive gland partial purification and characterization



Comparative Biochemistry and Physiology C Pharmacology Toxicology and Endocrinology 85(2): 259-268



DOI: 10.1016/0742-8413(86)90192-1

The scallop Pecten maximus contains a high concentration of cadmium in its digestive gland (approx. 100 ppm wet wt) when caught from apparently unpolluted water, and of this cadmium approximately 60% is soluble. The soluble cadmium is distributed mainly between three weight classes: greater than 150,000 mol. wt, approx. 55,000 mol. wt and approx. 10,000 mol. wt; which contain approx. 15, 60 and 15%, respectively of the soluble cadmium. The fraction of molecular weight greater than 150,000 contains at least three components. The 55,000 mol. wt component binds cadmium through cysteine thiolate groups. The strength of binding of cadmium to this component is less than that to metallothionein. The 10,000 mol. wt component is also a cadmium thiolate protein and appeared similar to some metallothionein-like proteins that have recently been described from other mollusc species. Its Cys content is lower than that of mammalian metallothionein.

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Accession: 004864829

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