[The role of electrostatic interactions in the absorption of ligands to the active sites of cholinesterases, as indicated by molecular modeling data].
The effect of electrostatic interactions on the absorption of the positively charged reversible inhibitor tetramethylammonium, its neutral structural analogue neopentane C(CH(3))(4), and the natural substrate acethylcholine to the active sites of acetylcholinesterase and butyrylcholinesterase has been studied by molecular modeling methods. It has been shown that the dominant absorption of positively charged ligands is due to the anchoring of the cationic group of the ligand in the anionic subsite of both enzymes through the interaction of the pi-cation with the benzene ring of tryptophan. The correlation between the free energy of complex formation and the catalytic activity of charged tetramethylammonium has been revealed for both enzymes. It has been shown that the effective binding of the acetylcholine molecule requires the additional activation of the enzyme.
Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, pr. Morisa Toreza 44, St. Petersburg, 194223 Russia. d_belinskaya@mail.ru
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Shestakova
D000109:Acetylcholine / Q000737:chemistry*; D000110:Acetylcholinesterase / Q000737:chemistry*; D002091:Butyrylcholinesterase / Q000737:chemistry*; D020134:Catalytic Domain; D008024:Ligands; D008958:Models, Molecular; D008968:Molecular Conformation; D056004:Molecular Dynamics Simulation; D010420:Pentanes / Q000737:chemistry*; D011485:Protein Binding; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D055672:Static Electricity
D008024:Ligands; D010420:Pentanes; D000644:Quaternary Ammonium Compounds; D000110:Acetylcholinesterase; D002091:Butyrylcholinesterase; C027917:tetramethylammonium; C039752:neopentane; D000109:Acetylcholine