Abstract
Calculations of the structures and energies of intermediates of the enzymatic hydrolysis of guanosine triphosphate, performed by means of quantum mechanics and molecular mechanics (QM/MM), suggest a mechanism for chemical transformations of reaction particles in an active site that assumes an amide-imide tautomerism of the side chain of glutamine residue. Positions of vibrational bands and a corresponding band shift upon isotopic substitution 14N → 15N in the side chain of glutamine residue in the active site are predicted for experimental verification of the given mechanism via IR spectroscopy.
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ACKNOWLEDGMENTS
This work was supported by the Russian Scientific Foundation, project no. 19-73-20032. The calculations were performed on the equipment of the shared resource center of Moscow State University’s high-performance computing resources and the Russian Academy of Sciences’ Joint Supercomputer Center.
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Grigorenko, B.L., Nemukhin, A.V. Theoretical Vibrational Spectra of Reaction Intermediates in the Active Site of Guanosine Triphosphate Binding Proteins. Russ. J. Phys. Chem. 94, 914–918 (2020). https://doi.org/10.1134/S0036024420050088
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DOI: https://doi.org/10.1134/S0036024420050088