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10:29
Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors
Published on: May 9, 2025
Induced fit simulations on nuclear receptors
Monika Nocker1, Pietro Cozzini
1Institute of Pharmacy and Food Chemistry, Am Hubland, Würzburg, Germany.
Current Topics in Medicinal Chemistry
|October 14, 2010
Summary
Nuclear receptors are crucial transcription factors. Understanding their flexibility, particularly helix12, is key for structure-based drug screening and predicting ligand interactions.
Area of Science:
- Biochemistry
- Structural Biology
- Pharmacology
Background:
- Nuclear receptors are ligand-activated transcription factors regulating fundamental biological processes.
- Structural data from the Protein Data Bank enables computational simulations of nuclear receptors.
- Receptor flexibility, especially helix12 and ligand-binding domain sidechains, influences ligand interactions.
Purpose of the Study:
- To review the structure and function of key nuclear receptors.
- To discuss the state-of-the-art in induced fit modeling for nuclear receptors.
- To highlight the importance of receptor flexibility in drug discovery.
Main Methods:
- Review of existing literature on nuclear receptor structure and function.
- Analysis of crystallographic data for nuclear receptors.
- Discussion of computational approaches for modeling flexibility.
Main Results:
- Nuclear receptors exhibit significant flexibility, impacting ligand binding.
- Induced fit approaches are crucial for understanding receptor-ligand dynamics.
- Structural insights aid in designing targeted screening strategies.
Conclusions:
- Flexibility is a key characteristic of nuclear receptors influencing their function.
- Advanced computational methods are essential for predicting ligand-induced conformational changes.
- Understanding these dynamics is vital for developing novel therapeutics.
Related Concept Videos
01:13Induced-fit Model
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Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical characteristics of...
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical characteristics of...
01:31Transducer Mechanism: Nuclear Receptors
Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
01:29The Two-State Receptor Model
The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with one...
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02:18The Equilibrium Binding Constant and Binding Strength
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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01:16Protein-Drug Binding: Mechanism and Kinetics
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Various forces drive these interactions, including hydrogen bonds, hydrophobic interactions, ionic bonds, electrostatic interactions, and van der Waals forces. These bonds enable drugs to bind to specific sites on proteins,...
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