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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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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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Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET
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A functional NMR for membrane proteins: dynamics, ligand binding, and allosteric modulation.

Kirill Oxenoid1, James J Chou1

  • 1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, 02115.

Protein Science : a Publication of the Protein Society
|March 2, 2016
PubMed
Summary

This review explores membrane protein dynamics and how ligands alter their conformational states. Understanding these molecular dynamics is crucial for drug development and protein function.

Keywords:
NMRallosteric modulationdrug bindingion channelsmembrane receptorsprotein dynamicstransporters

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Area of Science:

  • Biochemistry and Biophysics
  • Structural Biology
  • Molecular Neuroscience

Background:

  • Membrane proteins (channels, transporters, receptors) possess inherent conformational dynamics crucial for their functions.
  • Characterizing these dynamics and ligand-induced changes is challenging due to weak/transient binding interactions.

Purpose of the Study:

  • To review Nuclear Magnetic Resonance (NMR) studies on membrane protein dynamics.
  • To elucidate how small molecule ligands influence conformational states and equilibria.
  • To discuss the functional implications of ligand-modulated protein dynamics.

Main Methods:

  • Utilizing Nuclear Magnetic Resonance (NMR) spectroscopy to study membrane protein dynamics.
  • Analyzing conformational exchange rates, populations of different states, and ligand binding effects.
  • Integrating structural and dynamic information to understand protein function.

Main Results:

  • NMR provides insights into the dynamic nature of membrane proteins.
  • Small molecule ligands can significantly alter conformational landscapes and exchange equilibria.
  • Ligand binding can shift the balance between different functional protein states.

Conclusions:

  • Conformational dynamics are integral to membrane protein function.
  • NMR is a powerful tool for characterizing ligand-membrane protein interactions.
  • Understanding these dynamics is key to deciphering biological mechanisms and designing therapeutics.