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Cooperative Allosteric Transitions

Cooperative Allosteric Transitions

Cooperative Allosteric Transitions

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 Transitions

Cooperative Allosteric Transitions

Allosteric Regulation

Allosteric Regulation

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...

Allosteric Regulation

Allosteric Regulation

Applications Of NMR In Biology

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.

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Related Experiment Video

Updated: Mar 30, 2026

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode

Published on: June 4, 2021

Using NMR to Develop New Allosteric and Allo-Network Drugs.

Robert E Smith¹, Kevin Tran, Kristy M Richards

¹U.S. FDA, 11510 W 80th St., Lenexa, KS 66214, USA. Robert.smith@fda.hhs.gov.

Current Drug Discovery Technologies

|November 19, 2015

Summary

Nuclear Magnetic Resonance (NMR) is crucial for developing novel allosteric drugs. These drugs target allosteric sites, offering a promising alternative to active site-targeted therapies with potentially fewer side effects.

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Area of Science:

Biochemistry
Chemical Biology
Pharmacology

Background:

Proteins are flexible and exist in multiple conformations, influencing their interactions and functions.
Allosteric drugs bind to sites other than the active site, modulating protein activity and offering potential therapeutic advantages.
Traditional drug development often targets active sites, which can lead to off-target effects and side effects.

Purpose of the Study:

To highlight the role of Nuclear Magnetic Resonance (NMR) in identifying and characterizing allosteric binding sites and networks.
To explore NMR-based screening assays for studying ligand-protein interactions.
To demonstrate the application of NMR in the development of novel allosteric drugs.

Main Methods:

Utilizing NMR techniques such as saturation difference transfer NMR (STD-NMR) and water-Ligand Observed via Gradient Spectroscopy (waterLOGSY) for ligand-binding studies.
Employing (1)H-(15)N heteronuclear single quantum coherence (HSQC) to identify amino acids involved in ligand binding and map binding sites.
Applying chemical shift covariance analysis (CHESCA) to characterize allosteric networks based on NMR chemical shift perturbations.

Main Results:

NMR enables the identification of allosteric binding sites and the characterization of the resulting networks.
Specific NMR assays (STD-NMR, waterLOGSY, HSQC) provide insights into ligand-protein interactions and binding site identification.
CHESCA effectively identifies allosteric networks, aiding in the study of new molecular entities (NMEs) binding to therapeutic targets.

Conclusions:

NMR is a powerful tool for discovering and developing allosteric drugs by elucidating binding pathways and networks.
Allosteric drug development, guided by NMR, offers a strategy for creating therapeutics with potentially improved efficacy and safety profiles.
The described NMR methodologies facilitate the characterization of allosteric interactions crucial for advancing drug discovery efforts.