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Related Concept Videos

Structure-Activity Relationships and Drug Design01:28

Structure-Activity Relationships and Drug Design

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Drug design is a dynamic field that involves discovering and developing new medications based on specific biological targets. This process heavily relies on structure-activity relationships (SAR) and quantitative structure-activity relationships (QSAR) to guide the design and optimization of efficient drugs.
SAR studies the intricate relationship between a drug's chemical structure and biological activity. It focuses on understanding how modifications to a drug's structure can influence...
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Allosteric Proteins-ATCase01:19

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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to  N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...
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Allosteric Regulation01:08

Allosteric Regulation

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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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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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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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Updated: Aug 23, 2025

Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission
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QSAR models reveal new EPAC-selective allosteric modulators.

Hebatallah Mohamed1, Hongzhao Shao1, Madoka Akimoto1

  • 1Department of Chemistry and Chemical Biology, McMaster University, Hamilton Ontario L8S 4L8 Canada melacin@mcmaster.ca.

RSC Chemical Biology
|November 2, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a quantitative structure-activity relationship (QSAR) model to predict EPAC-selective compounds. This model aids in identifying potent drug leads for diseases like cancer and diabetes by screening EPAC modulators.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Pharmacology and Drug Discovery

Background:

  • Exchange proteins directly activated by cAMP (EPAC) are key regulators of Rap1/Rap2 GTPases.
  • EPAC activity is implicated in various diseases, including cardiomyopathy, diabetes, chronic pain, and cancer.
  • Targeting EPAC offers therapeutic potential, but quantitative structure-activity relationship (QSAR) studies are limited.

Purpose of the Study:

  • To develop and validate a QSAR model for EPAC-specific compounds.
  • To identify novel EPAC modulators with potential therapeutic applications.

Main Methods:

  • Development of a QSAR model using a series of EPAC-specific compounds.
  • In silico prediction and validation of compound affinity.
  • Experimental validation using fluorescence-based competition assays.
  • Structural elucidation of compound binding and mechanism via NMR spectroscopy.

Main Results:

  • The QSAR model demonstrated high reproducibility and predictive accuracy.
  • An experimentally validated compound showed high predicted affinity.
  • NMR studies revealed the compound's binding mode and partial agonist activity.
  • The model successfully predicted activity for compounds previously unknown to it.

Conclusions:

  • The developed QSAR model is an effective tool for screening and identifying potent EPAC-selective drug leads.
  • This approach can accelerate the discovery of novel therapeutics targeting EPAC for various diseases.
  • Understanding the binding mechanism provides insights for future drug design.