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[Human hemoglobin structure and respiratory transport]

T Imamura1

  • 1Department of Human Genetics, National Institute of Genetics.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|September 1, 1996
PubMed
Summary

Hemoglobin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Structure

Context:

  • Hemoglobin's crucial role in oxygen and carbon dioxide transport.
  • Allostery theory explaining protein conformational changes.
  • Hemoglobin structure: tetramer of alpha and beta polypeptide chains.

Purpose:

  • To elucidate the structural mechanisms of hemoglobin's oxygen transport function.
  • To describe the T (tense) and R (relaxed) states of hemoglobin.
  • To explain the allosteric transition between T and R states.

Summary:

  • Hemoglobin exists in two states: T (tense) and R (relaxed), dictated by allostery.
  • The T state has clamped pockets hindering oxygen binding, while the R state has open pockets.
  • Oxygen binding induces a transition from T to R, facilitating oxygen uptake, while oxygen release promotes the T state.

Impact:

  • Understanding hemoglobin's structure-function relationship.
  • Insights into protein allostery and conformational dynamics.
  • Foundation for research on hemoglobinopathies and oxygen-carrying therapeutics.

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