Manganese and Iron Binding to Human Transferrin

Authors

  • A Badii
  • AA Moshtaghie
  • H Kharazi
  • M Fazilati
  • T Hassanzadeh
Abstract:

The characteristics of manganese and iron binding to human apotransferrin (apo-tf) have been investigated and compared in this study. Both metal ions were taken up by human apo-tf and formed complexes, with the maximum absorbances observed at 410 and 340 nm for manganese-transferrin (Mn-tf) and 465 nm for iron-transferrin (Fe-tf). Addition of manganese (1.5 µg/ml) to the reaction mixture containing iron and apo-tf, reduced Fe binding to apo-tf by 20 percent, in comparison to the control sample. The binding of both metals to apo-tf appears to be time and pH dependent processes. Using the equilibrium dialysis technique, the binding constant of manganese to apo-tf was also determined. The binding constatnt of Mn to apo-tf was calculated, using the Scatchard plot analysis. The calculated Ka was 3.1×109 M-1. The binding of manganese and iron to human apo-tf has been discussed and compared in this work, using different biochemical techniques.

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Journal title

volume Volume 6  issue Number 2

pages  101- 106

publication date 2010-11-20

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