Exploring enantiospecific ligand-protein interactions using cellular membrane affinity chromatography: chiral
Krzysztof Jozwiak1, Ruin Moaddel, Sarangan Ravichandran
1Laboratory of Drug-Receptor Interactions, Medical University of Lublin, 20-081 Lublin, Poland.
Summary
Chiral recognition in drug interactions involves dynamic binding processes. Understanding these mechanisms on nicotinic acetylcholine receptors and organic cation transporters is key for developing effective therapeutics.
Area of Science:
- Pharmacology
- Biochemistry
- Molecular Biology
Background:
- Chiral recognition is crucial for the selective binding of enantiomers to biological targets.
- Understanding these mechanisms is vital for drug development and predicting drug efficacy and safety.
Purpose of the Study:
- To review the chiral recognition mechanisms at the alpha3beta4 nicotinic acetylcholine receptor (alpha3 beta4 nAChR) and human organic cation transporter 1 (hOCT1).
- To compare and contrast the enantioselective binding processes at these two distinct targets.
Main Methods:
- Literature review of studies investigating enantioselective binding.
- Analysis of binding interactions, including hydrophobic pockets, hydrogen bonding, and conformational adjustments.
Main Results:
- Chiral recognition at alpha3beta4 nAChR involves initial hydrophobic tethering followed by a defining hydrogen bonding step favoring dextromethorphan.
- hOCT1 exhibits chiral recognition through interactions with four binding sites, with conformational adjustments being key.
- (R)-verapamil demonstrated interaction with all four identified binding sites on hOCT1.
Conclusions:
- Chiral recognition is a dynamic process, not static.
- Existing interaction-based models for chiral recognition need to be updated to incorporate dynamic conformational changes.
More Related Videos
Related Concept Videos
01:03Affinity Chromatography
Affinity chromatography is a powerful technique extensively utilized for separating and purifying specific biomolecules from complex mixtures. It capitalizes on the highly selective binding between an analyte and its counterpart, such as antibody-antigen interactions. The counterpart is immobilized on the stationary phase, forming an affinity column. The stationary phase typically consists of solid support, such as agarose or porous glass beads, immobilizing the affinity ligand. The mobile...
02:30Chirality in Nature
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid. The...
02:40Ligand 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...
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...
02:05Prochirality
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...