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J Behlke1, W Scheler

  • 1Institut für Pharmakologie und Toxikologie der Universität, Greifswald, DDR

FEBS Letters
|April 2, 1970
PubMed
Summary

Lampetra fluviatilis hemoglobin exists as single polypeptide chains in alkaline conditions but forms dimers and oligomers in acidic environments. These pH-dependent transitions reveal distinct aggregation behaviors for deoxyhemoglobin and its oxygenated or carbonylated forms.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Comparative Physiology

Background:

  • Hemoglobin (Hb) structure and function are critical for oxygen transport in vertebrates.
  • Lampetra fluviatilis, an ancient vertebrate lineage, provides insights into hemoglobin evolution.
  • Understanding hemoglobin's quaternary structure transitions is key to elucidating its physiological roles.

Purpose of the Study:

  • To characterize the aggregation state and sedimentation behavior of Lampetra fluviatilis hemoglobin under varying pH conditions.
  • To determine the molecular weight and subunit composition of Lampetra fluviatilis hemoglobin.
  • To investigate the pH-dependent monomer-oligomer transitions of deoxyhemoglobin, oxyhemoglobin, and carbonmonoxyhemoglobin.

Main Methods:

  • Sedimentation analysis in alkaline aqueous solutions to determine sedimentation coefficients and molecular weights.
  • Investigation of hemoglobin behavior in weak acidic conditions to observe monomer-oligomer transitions.
  • Determination of pH(0.5) values for deoxyhemoglobin, oxyhemoglobin, and carbonmonoxyhemoglobin.

Main Results:

  • In alkaline solutions, Lampetra fluviatilis hemoglobin exhibits a sedimentation coefficient of 1.9 ± 0.1 S, indicating a molecular weight of approximately 17,000, consistent with a single haem polypeptide chain.
  • In weak acidic conditions, both non-liganded (DeoxyHb) and liganded forms (HbO2, HbCO) associate into dimers and oligomers.
  • The monomer-oligomer transitions occur at different pH values: approximately 6.7 for DeoxyHb and 5.9 for HbO2 and HbCO, suggesting distinct aggregation mechanisms.

Conclusions:

  • Lampetra fluviatilis hemoglobin exists as monomers in alkaline conditions and undergoes pH-dependent oligomerization in acidic environments.
  • The observed differences in transition pH values highlight distinct aggregation properties between liganded and non-liganded hemoglobin states.
  • The preferred association equilibrium appears to follow a pathway involving dimers and tetramers (4 Hb ⇌ 2 Hb₂ ⇌ Hb₄).

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