Engineered Conotoxin Differentially Blocks and Discriminates Rat and Human α7 Nicotinic Acetylcholine Receptors
Copyright policy )Engineered Conotoxin Differentially Blocks and Discriminates Rat and Human α7 Nicotinic Acetylcholine Receptors
The α7 nicotinic acetylcholine receptor (nAChR) is present in the central nervous system and plays an important role in cognitive function and memory. α-Conotoxin LvIB, identified from genomic DNA of Conus lividus, its three isomers and four globular isomer analogues were synthesized and screened at a wide range of nAChR subtypes. One of the analogues, amidated [Q1G,ΔR14]LvIB, was found to be a potent blocker of rat α7 nAChRs. Importantly, it differentiates between α7 nAChRs of human (IC50: 1570 nM) and rat (IC50: 97 nM). Substitutions between rat and human α7 nAChRs at three key mutation sites revealed that no single mutant could completely change the activity profile of amidated [Q1G,ΔR14]LvIB. Rather, we found that the combined influence of Gln141, Asn184, and Lys186 determines the α7 nAChR species specificity of this peptide. This engineered α4/4 conotoxin has potential applications as a template for designing ligands to selectively block human α7 nAChRs.
- University of California, San Diego United States
- Guangxi University China (People's Republic of)
- Hainan University China (People's Republic of)
- University of Queensland Australia
- University of Queensland Australia
Binding Sites, alpha7 Nicotinic Acetylcholine Receptor, Xenopus, Molecular Dynamics Simulation, Ligands, Rats, Inhibitory Concentration 50, Isomerism, Species Specificity, Mutagenesis, Oocytes, Animals, Humans, Amino Acid Sequence, Conotoxins, Sequence Alignment
Binding Sites, alpha7 Nicotinic Acetylcholine Receptor, Xenopus, Molecular Dynamics Simulation, Ligands, Rats, Inhibitory Concentration 50, Isomerism, Species Specificity, Mutagenesis, Oocytes, Animals, Humans, Amino Acid Sequence, Conotoxins, Sequence Alignment
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