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Related Concept Videos

Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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...
Multiple Allele Traits01:49

Multiple Allele Traits

The Concept of Multiple Allelism
Multiple Allele Traits01:49

Multiple Allele Traits

The Concept of Multiple Allelism
Hemoglobin01:24

Hemoglobin

Hemoglobin is a globular protein made up of four subunits. Two of these subunits are alpha chains, and the other two are beta chains. Each subunit contains a molecule of heme, which has an iron atom and can bind to oxygen. When an oxygen molecule binds to one heme group, it changes the shape of hemoglobin, making it easier for the other heme groups to bind oxygen as well.
When all four heme groups are bound to oxygen, the resulting molecule is called oxyhemoglobin. As a result, arterial blood...

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Related Experiment Video

Updated: Jun 2, 2026

Measurement of Heme Synthesis Levels in Mammalian Cells
09:43

Measurement of Heme Synthesis Levels in Mammalian Cells

Published on: July 9, 2015

Hemoglobin allostery: variations on the theme.

Andrea Bellelli1, Maurizio Brunori

  • 1Department of Biomedical Sciences, Sapienza University of Rome, Rome, Italy.

Biochimica Et Biophysica Acta
|May 14, 2011
PubMed
Summary

Investigating trout hemoglobin reveals how tertiary and quaternary structural changes influence allosteric effects, reconciling discrepancies in the Monod-Wyman-Changeux model. This offers new insights into hemoglobin function.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • The Monod-Wyman-Changeux (MWC) model provides a foundational framework for understanding hemoglobin allosteric behavior.
  • Existing research highlights discrepancies between the MWC model and experimental data, prompting theoretical modifications.
  • Recent studies emphasize the significance of tertiary structural changes and heterotropic effectors in hemoglobin regulation.

Purpose of the Study:

  • To analyze and reconcile discrepancies between the MWC model and experimental observations of hemoglobin function.
  • To elucidate the relative contributions of tertiary and quaternary allosteric effects by examining non-human hemoglobins.
  • To understand the role of heterotropic effectors in modulating hemoglobin's functional properties.

Main Methods:

More Related Videos

Immunostaining-Based Detection of Dynamic Alterations in Red Blood Cell Proteins
10:07

Immunostaining-Based Detection of Dynamic Alterations in Red Blood Cell Proteins

Published on: March 17, 2023

Related Experiment Videos

Last Updated: Jun 2, 2026

Measurement of Heme Synthesis Levels in Mammalian Cells
09:43

Measurement of Heme Synthesis Levels in Mammalian Cells

Published on: July 9, 2015

Immunostaining-Based Detection of Dynamic Alterations in Red Blood Cell Proteins
10:07

Immunostaining-Based Detection of Dynamic Alterations in Red Blood Cell Proteins

Published on: March 17, 2023

  • Comparative analysis of allosteric models and experimental data for various hemoglobins.
  • Focus on trout hemoglobins as model systems due to their diverse heterotropic effects.
  • Review of structural and functional information, including kinetic models and effector roles.

Main Results:

  • Trout hemoglobins exhibit a wide spectrum of heterotropic effects, from absent to extreme.
  • These variations highlight the significant role of tertiary structural changes in allosteric modulation.
  • The study provides a framework for understanding how different hemoglobins balance tertiary and quaternary allosteric contributions.

Conclusions:

  • Reconciliation of MWC model discrepancies is possible through a nuanced understanding of tertiary and quaternary effects.
  • Trout hemoglobins serve as critical models for dissecting the interplay of allosteric mechanisms.
  • This research deepens our comprehension of hemoglobin cooperativity and its regulation by effectors.