Ligand Screening
Ligand Screening - Related Videos
02:40
Ligand Binding Sites
0 Views •
2020
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...
02:51
Metal-Ligand Bonds
0 Views •
2020
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...
00:49
Ligand Binding and Linkage
0 Views •
2020
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 the...
12:30
Avidity-based Extracellular Interaction Screening (AVEXIS) for the Scalable Detection of Low-affinity Extracellular Receptor-Ligand Interactions
0 Views •
Cited by 56 •
2012
AVEXIS is a high throughput protein interaction assay developed to systematically screen for novel extracellular receptor-ligand pairs involved in cellular recognition processes. It is specifically designed to detect transient protein interactions that are difficult to identify using other high throughput approaches.
14:13
Detecting Estrogenic Ligands in Personal Care Products using a Yeast Estrogen Screen Optimized for the Undergraduate Teaching Laboratory
0 Views •
Cited by 1 •
2018
This article presents an optimized yeast estrogen screen for quantifying ligands in Personal Care Products (PCPs) that bind estrogen receptors alpha (ERα) and/or beta (ERβ). The method incorporates two colorimetric substrate options, a six-day refrigerated incubation for use in undergraduate courses, and statistical tools for data analysis.
FAQs
Binding assays detect whether a molecule engages a biological target, whereas functional assays examine whether that engagement changes target activity. This distinction separates physical recognition from a measurable biological effect. In practice, combining both approaches can help identify molecules that bind proteins, nucleic acids, or receptors and determine whether they act as inhibitors, activators, or useful molecular probes.
Competition experiments test whether a candidate molecule affects the binding of a reference ligand under defined conditions. A change in the measured signal indicates that the candidate may engage the same target or influence access to the relevant binding interaction. This format provides a comparative way to evaluate target engagement rather than relying only on an isolated signal from the candidate.
Follow-up assays examine whether an initial screening result reflects a selective and meaningful interaction. Measurements of potency indicate how strongly the molecule produces the observed effect, while selectivity testing addresses whether it favors the intended target over other targets. Additional analysis can clarify the molecule's mechanism, supporting prioritization of compounds for further characterization.
A typical workflow begins with a compound library and a biological target, followed by testing under defined assay conditions. Researchers record signals associated with binding, altered activity, or competition with a known ligand. Compounds producing informative results are then examined in follow-up assays for selectivity, potency, and mechanism before being considered as probes or lead compounds.
The approach can examine interactions involving proteins, nucleic acids, and receptors, allowing researchers to study molecular recognition across several biochemical target classes. Depending on the assay design, the resulting compounds may function as inhibitors, activators, or probes. This broad target range makes screening useful for investigating both individual molecular interactions and larger biochemical systems.
In biochemistry, screening helps connect molecular binding events with protein function and cellular signaling. The resulting compounds can provide probes for studying these processes or serve as starting points for lead development. Because later assays assess potency, selectivity, and mechanism, the workflow also supports the early evaluation of molecules with potential relevance to therapeutic development.