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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

Metal-Ligand Bonds

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

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

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Complexometric Titration: Ligands

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...

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NOP-Targeted Nonpeptide Ligands.

Nurulain T Zaveri¹, Michael E Meyer²

¹Astraea Therapeutics, LLC., Mountain View, CA, USA. nurulain@astraeatherapeutics.com.

Handbook of Experimental Pharmacology

|May 24, 2019

Summary

Nonpeptide small-molecule ligands targeting the NOP receptor show therapeutic promise. Ongoing research and clinical trials are refining the development of novel NOP-targeted compounds for various medical conditions.

Keywords:

NOP agonists NOP antagonists NOP ligands Nociceptin ligands Small-molecule NOP ligands

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Area of Science:

Pharmacology
Medicinal Chemistry
Neuroscience

Background:

The NOP receptor, discovered in 1994 and de-orphaned in 1995 with nociceptin/orphanin FQ (N/OFQ), is a validated target for therapeutics.
Significant pharmaceutical industry efforts have focused on discovering nonpeptide NOP ligands through high-throughput screening.
NOP receptor ligands, including agonists and antagonists, have been developed as clinical candidates for various indications.

Purpose of the Study:

To review the drug design of nonpeptide NOP ligands.
To highlight recent advances in NOP ligand development, including structure elucidation and functional selectivity.
To discuss the potential of novel NOP ligands for unmet clinical needs.

Main Methods:

Review of literature on nonpeptide NOP ligand discovery and development.
Analysis of clinical trial outcomes for NOP-targeted compounds.
Exploration of advances in GPCR structure elucidation and ligand design.

Main Results:

Nonpeptide NOP ligands have been extensively explored, with some progressing to clinical trials.
Both successful and failed trials offer valuable insights for future drug development.
Newer design strategies, including functional selectivity and multi-targeted ligands, enhance rational design.

Conclusions:

The NOP receptor remains a promising target for therapeutic intervention.
Advances in medicinal chemistry and pharmacology are enabling the design of optimized NOP ligands.
Further development of NOP-targeted compounds holds potential for addressing unmet clinical needs.