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Cooperative Allosteric Transitions01:58

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
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Allosteric transitions in hemoglobin revisited.

Naoya Shibayama1

  • 1Division of Biophysics, Department of Physiology, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi 329-0498, Japan.

Biochimica Et Biophysica Acta. General Subjects
|April 6, 2019
PubMed
Summary

Human hemoglobin allostery is more complex than the simple two-state model. Recent studies reveal multiple conformers and intermediate forms, impacting oxygen affinity and protein regulation.

Keywords:
Allosteric regulationAllosteryConformational changeHemoglobinProtein functionX-ray crystallography

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Dynamics

Background:

  • Human hemoglobin is an allosteric protein controlling ligand binding via conformational changes.
  • The traditional two-state model simplifies hemoglobin allostery, but recent findings reveal greater complexity.
  • Environmental factors trigger conformational transitions in hemoglobin.

Purpose of the Study:

  • To review current understanding of hemoglobin structure-function relationships.
  • To elucidate the detailed conformational transition pathway of hemoglobin.
  • To discuss the role of single-molecule techniques in studying hemoglobin.

Main Methods:

  • Analysis of a unique single crystal containing multiple quaternary structures.
  • Crystallographic approaches to study hemoglobin conformers.
  • Examination of single-molecule techniques for protein analysis.

Main Results:

  • Hemoglobin allosteric transition involves shifts among multiple quaternary conformers, not a simple two-state switch.
  • Intermediate forms exist in the hemoglobin transition pathway.
  • Coexisting conformers disproportionately affect oxygen affinity.

Conclusions:

  • Hemoglobin allostery is more complex than previously described, involving conformational distributions.
  • Understanding these distributions is key to regulating allosteric protein function.
  • Recent discoveries refine our view of hemoglobin's intricate allosteric mechanism.