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Sheep ceruloplasmin: isolation and characterization.

L Calabrese, E Capuozzo, A Galtieri

Molecular and Cellular Biochemistry

|January 1, 1983

Summary

This summary is machine-generated.

Researchers isolated sheep ceruloplasmin, a protein similar to human and bovine forms but with lower copper content and higher enzyme activity. Its optimal activity occurs at pH 6.3 within a pH range of 5-8.

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Area of Science:

Biochemistry
Proteomics
Enzymology

Background:

Ceruloplasmin (Cp) is a key copper-binding protein involved in various physiological processes.
Previous studies have characterized human and bovine ceruloplasmin, highlighting their structural and functional properties.

Purpose of the Study:

To isolate and characterize ovine ceruloplasmin from sheep plasma.
To compare the biochemical and enzymatic properties of ovine ceruloplasmin with those of human and bovine ceruloplasmin.

Main Methods:

Isolation of ovine ceruloplasmin using a combination of ammonium sulfate fractionation and two chromatographic steps.
Analysis of amino acid composition, molecular weight, copper content, and enzyme activity.
Spectroscopic analysis to determine pH-dependent properties.

Main Results:

Ovine ceruloplasmin was successfully isolated, revealing a single polypeptide chain of approximately 125 kDa.
High homology in amino acid composition was observed between ovine, human, and bovine ceruloplasmin.
Ovine ceruloplasmin exhibited lower copper content but higher specific enzyme activity compared to human and bovine counterparts.
Optimal oxidase activity was identified at pH 6.3, with activity observed in the pH range of 5-8.

Conclusions:

Ovine ceruloplasmin shares significant structural similarities with other mammalian ceruloplasmins.
Distinct differences in copper content and specific enzyme activity suggest unique functional roles or regulatory mechanisms in sheep.
The pH-dependent activity profile provides insights into the optimal conditions for ceruloplasmin's enzymatic function.