title: [Transformation of chemical energy in biomolecular systems with hydrogen bonds].
abstract: The mechanism underlying the excitation of the hydrogen bond with ATP hydrolysis was considered. Coulomb interactions of the proton of the hydrogen bond A-H...B with the electrical field of the covalent bond of ADP-P were calculated. It was shown that the electrical field of the covalent bond of ADP-P excites oscillations of the proton in the complex with the hydrogen bond A-H...B and displaces it from the equilibrium towards the covalent bond. The distortion of the potential curve depends on a change in the length of the covalent bond of ADP-P. Adiabatic potentials U0 and UN of the ADP-P system were calculated, which correspond to the ground and excited states of the H-bond proton. It was found that as the length of the bond of ADP-P (rho) increases, the branches of the adiabatic potential U0(rho) and UN(rho) intersect. At the intersection point, the system can transit to the branch UN(rho), which can lead to a reduction of the barrier and a break of the covalent bond of ADP-P. Presumably, this mechanism is universal for processes of transformation of the chemical energy of ATP to the energy of excited hydrogen bond, a mechanism for the maintenance of heat balance and reduction of entropy in a living organism.
authors.affiliation: Donetsk State University, ul. Shchorsa 46, Donetsk, 83050 Ukraine.
authors.forename: S V
authors.initials: SV
authors.lastname: Bespalova
authors.forename: A M
authors.initials: AM
authors.lastname: Mishchenko
authors.forename: V M
authors.initials: VM
authors.lastname: Shatalov
mesh_terms: D000244:Adenosine Diphosphate / Q000737:chemistry; D000255:Adenosine Triphosphate / Q000737:chemistry*; D000465:Algorithms; D004560:Electricity; D006860:Hydrogen Bonding; D011522:Protons; D013816:Thermodynamics
chemical_list: D011522:Protons; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate