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Related Experiment Videos

Carbon dioxide binding to human hemoglobin cross-linked between the alpha chains.

K D Vandegriff1, L Benazzi, M Ripamonti

  • 1Division of Blood Research, Letterman Army Institute of Research, Presidio of San Francisco, California 94129-6800.

The Journal of Biological Chemistry
|February 15, 1991
PubMed
Summary

Cross-linking human hemoglobin (Hb) between Lys alpha 99 residues reduces carbon dioxide (CO2) binding capacity and affinity. This modification specifically hinders CO2 interaction with the alpha-subunit N-termini.

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Area of Science:

  • Biochemistry
  • Physiological Chemistry

Background:

  • Human hemoglobin (Hb) exhibits distinct binding sites for carbon dioxide (CO2), involving amino-terminal valines of alpha and beta chains.
  • Understanding CO2 binding to Hb is crucial for studying respiratory gas transport and physiological pH regulation.

Purpose of the Study:

  • To investigate the effect of cross-linking human hemoglobin between Lys alpha 99 residues on carbon dioxide binding.
  • To determine how this cross-linking modification alters CO2 affinity and the ligand-linked effect.

Main Methods:

  • Manometric techniques were employed to measure carbon dioxide binding to unmodified and cross-linked human hemoglobin.
  • Data were analyzed using binding models to quantify affinity constants and site capacities.

Main Results:

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  • Cross-linked hemoglobin demonstrated reduced CO2 binding compared to native Hb across all CO2 concentrations and ligand states.
  • The ligand-linked effect on CO2 binding was diminished in the cross-linked Hb.
  • Analysis indicated that cross-linking at Lys alpha 99 prevents CO2 binding at the alpha-subunit NH2 termini, reducing overall CO2 saturation.

Conclusions:

  • Cross-linking human hemoglobin at Lys alpha 99 significantly impairs CO2 binding, particularly at the alpha-subunit N-termini.
  • This modification alters the affinity and capacity of hemoglobin for carbon dioxide, impacting its physiological role in gas transport.