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Ligand Binding Sites

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...

Ligand Binding Sites

Ligand Binding Sites

The Two-State Receptor Model

The 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...

Quantitative Aspects of Drug-Receptor Interaction

Quantitative Aspects of Drug-Receptor Interaction

The receptor occupancy theory connects a drug's response to the number of occupied receptors. With higher drug concentrations, more receptors are occupied, leading to increased responses. The formation of drug-receptor complexes involves association and dissociation rates, which reach equilibrium when the forward and backward reactions are equal. The equilibrium association constant (Ka) and its inverse, the equilibrium dissociation constant (Kd), indicate drug affinity. Higher Ka and lower...

Ligand Binding and Linkage

Ligand Binding and Linkage

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...

Ligand Binding and Linkage

Ligand Binding and Linkage

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Exploring Protein-Glycan Interactions: Advances in Nuclear Magnetic Resonance

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Combinatorial entropy behaviour leads to range selective binding in ligand-receptor interactions.

Meng Liu^1,2, Azzurra Apriceno^3,4, Miguel Sipin^3,4

¹Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, People's Republic of China.

Nature Communications

|September 25, 2020

Summary

Multivalent constructs can achieve range selectivity, binding targets with a specific number of receptors. This phenomenon enhances targeting precision for applications like drug delivery and diagnostics.

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Area of Science:

Biophysics
Nanotechnology
Materials Science

Background:

Multivalent interactions, where multiple ligands bind to multiple receptors, are crucial for biological recognition.
Existing multivalent constructs often lack precise targeting capabilities, leading to off-target effects.

Purpose of the Study:

To introduce and define the concept of 'range selectivity' in multivalent binding.
To theoretically model and experimentally validate range selectivity for enhanced targeting.

Main Methods:

Statistical mechanical modeling was employed to analyze multivalent binding phenomena.
The study characterized the parameter space for achieving range selectivity.
Experimental validation was performed to support the model's predictions.

Main Results:

Multivalency enables range selectivity, allowing constructs to bind targets within a defined receptor number range.
The model identified specific conditions and parameters favoring range selective targeting.
Experimental data confirmed the occurrence of range selectivity in functionalized constructs.

Conclusions:

Range selectivity offers a novel strategy to improve the specificity of multivalent constructs.
This approach has significant implications for designing targeted therapies and diagnostic tools.
Exploiting multivalency for precise targeting opens new avenues in molecular engineering.