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Increased oxygen affinity with normal heterotropic effects in hemoglobin Loire [alpha 88(F9)Ala----Ser]
F Baklouti1, V Baudin-Chich, J Kister
1CNRS UA 1171, Faculté de Médecine Grange Blanche, Lyon, France.
European Journal of Biochemistry
|November 1, 1988
Summary
Hemoglobin Loire exhibits enhanced oxygen binding due to an alanine to serine substitution, improving oxygen affinity. This mutation does not affect Bohr effect or 2,3-BPG regulation, suggesting subtle structural changes.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Background:
- Hemoglobin (Hb) is crucial for oxygen transport.
- Allosteric regulation of Hb is vital for efficient oxygen delivery.
- Mutations can alter Hb function, impacting oxygen transport.
Observation:
- Hemoglobin Loire (alpha 88 Ala to Ser substitution) displays increased homotropic allosteric effect.
- Oxygen binding curves and kinetic studies were performed on Hb Loire.
- Normal heterotropic effects, including Bohr effect and 2,3-bisphosphoglycerate regulation, were maintained.
Findings:
- The alpha 88(F9) Ala to Ser substitution in Hb Loire increases oxygen affinity.
- A decreased n50 value was observed, indicating enhanced cooperativity.
- Bezafibrate binding to Hb Loire mirrors that of normal adult hemoglobin (Hb A).
Implications:
- Hb Loire's altered functional properties suggest a destabilization of the T (tense) state.
- The C-terminal region of the alpha chain may undergo slight displacement.
- Understanding these structural-functional relationships aids in studying hemoglobinopathies and oxygen transport mechanisms.