Purification and partial characterization of a ...

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Title Purification and partial characterization of a cadmium-binding protein from the liver of rainbow trout (Onchorynchus mykiss)
Author(s) J. E. Mullins, R. A. Fredrickson, I. C. Fuentealba, R. J. Frederick Markham
Journal Canadian Journal of Veterinary Research = Revue Canadienne de Recherche Veterinaire
Date 1999
Volume 63
Issue 4
Start page 225
End page 229
Abstract This study describes the isolation and partial characterization of a low molecular weight (approximately 14 kDa), cadmium-binding protein from rainbow trout (Onchorynchus mykiss) liver. Rainbow trout were injected intraperitoneally with 3.5 mg/kg cadmium chloride (total body dose) twice weekly for 3 wk. Livers were removed and a cadmium-binding protein was isolated. Monoclonal antibodies produced against this protein were used in the affinity purification process. Amino acid analysis showed the protein contained 3.8 mol% cysteine, 3.5 mol% phenylalanine, 2.2 mol% tyrosine and 1.9 mol% histidine. The low cysteine content suggests that it was distinct from metallothionein. The monoclonal antibodies were also used to identify the protein in liver homogenates from both cadmium-exposed and control fish and in the testes of cadmium-exposed mice lacking the gene for both metallothionein-1 and metallothionein-II. The compound identified in this study represents a non-metallothionein cadmium-binding protein that appears to be highly conserved.

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