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Related Experiment Video

Updated: Jul 20, 2026

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
11:04

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Human serum gamma-globulin binds copper cations.

E E Babaeva1, U A Vorobyova, M S Zharkova

  • 1Laboratory of Cell-to-Cell Interactions, N F Gamaleya Institute of Epidemiology and Microbiology.

Bulletin of Experimental Biology and Medicine
|August 26, 2006
PubMed
Summary

This study investigated copper cation binding to human serum gamma-globulin. Results show multiple binding sites on the gamma-globulin molecule with varying affinities for copper.

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Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of Gold(III)

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Area of Science:

  • Biochemistry
  • Biophysical Chemistry

Background:

  • Human serum gamma-globulin is a key protein in the immune system.
  • Understanding metal-protein interactions is crucial for biological and medical research.

Purpose of the Study:

  • To investigate the binding characteristics of copper cations to human serum gamma-globulin.
  • To determine the number and affinity of copper-binding sites on the gamma-globulin molecule.

Main Methods:

  • Molecular ultrafiltration was employed to separate free and bound copper.
  • Sodium diethyldithiocarbamate reaction was used to quantify free copper ions.
  • UV spectrophotometry was utilized to assess protein conformational changes.

Main Results:

  • Human serum gamma-globulin exhibits multiple copper-binding sites.
  • These sites possess distinct binding constants, indicating differential affinities for copper.
  • Binding occurs sequentially as copper concentration increases, filling sites one by one.

Conclusions:

  • The human serum gamma-globulin molecule possesses a heterogeneous population of copper-binding sites.
  • The sequential filling of these sites suggests a cooperative or ordered binding mechanism.
  • This interaction influences the conformation and function of gamma-globulin.