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Nayak SK, Terraneo G, Piacevoli Q, Bertolotti F, Scilabra P, Brown JT, Rosokha SV, Resnati G. Molecular Bases for Anesthetic Agents: Halothane as a Halogen- and Hydrogen-Bond Donor. Angew Chem Int Ed Engl 2019; 58:12456-12459. [PMID: 31313458 DOI: 10.1002/anie.201907829] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Indexed: 12/15/2022]
Abstract
Although instrumental for optimizing their pharmacological activity, a molecular understanding of the preferential interactions given by volatile anesthetics is quite poor. This paper confirms the ability of halothane to work as a hydrogen-bond (HB) donor and gives the first experimental proof that halothane also works as a halogen-bond (HaB) donor in the solid state and in solution. A halothane/hexamethylphosphortriamide co-crystal is described and its single-crystal X-ray structure shows short HaBs between bromine, or chlorine, and the phosphoryl oxygen. New UV/Vis absorption bands appear upon addition of diazabicyclooctane and tetra(n-butyl)ammonium iodide to halothane solutions, indicating that nitrogen atoms and anions may mediate the HaB-driven binding processes involving halothane as well. The ability of halothane to work as a bidentate/tridentate tecton by acting as a HaB and HB donor gives an atomic rationale for the eudismic ratio shown by this agent.
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Affiliation(s)
- Susanta K Nayak
- Department of Chemistry, Materials, and Chemical Engineering "Giulio Natta", Politecnico di Milano, via L. Mancinelli 7, 20131, Milano, Italy.,Department of Chemistry, Visvesvaraya National Institute of Technology (VNIT), Nagpur, Maharashtra-, 440010, India
| | - Giancarlo Terraneo
- Department of Chemistry, Materials, and Chemical Engineering "Giulio Natta", Politecnico di Milano, via L. Mancinelli 7, 20131, Milano, Italy
| | - Quirino Piacevoli
- San Filippo Neri Hospital, Department of Anesthesia and Intensive Care, Rome, Italy
| | - Federica Bertolotti
- Department of Chemistry, Materials, and Chemical Engineering "Giulio Natta", Politecnico di Milano, via L. Mancinelli 7, 20131, Milano, Italy
| | - Patrick Scilabra
- Department of Chemistry, Materials, and Chemical Engineering "Giulio Natta", Politecnico di Milano, via L. Mancinelli 7, 20131, Milano, Italy
| | - John T Brown
- Chemistry Department, Ball State University, Muncie, IN, 47306, USA
| | - Sergiy V Rosokha
- Chemistry Department, Ball State University, Muncie, IN, 47306, USA
| | - Giuseppe Resnati
- Department of Chemistry, Materials, and Chemical Engineering "Giulio Natta", Politecnico di Milano, via L. Mancinelli 7, 20131, Milano, Italy
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Nayak SK, Terraneo G, Piacevoli Q, Bertolotti F, Scilabra P, Brown JT, Rosokha SV, Resnati G. Molecular Bases for Anesthetic Agents: Halothane as a Halogen‐ and Hydrogen‐Bond Donor. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907829] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Susanta K. Nayak
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”Politecnico di Milano via L. Mancinelli 7 20131 Milano Italy
- Department of ChemistryVisvesvaraya National Institute of Technology (VNIT) Nagpur Maharashtra- 440010 India
| | - Giancarlo Terraneo
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”Politecnico di Milano via L. Mancinelli 7 20131 Milano Italy
| | - Quirino Piacevoli
- San Filippo Neri HospitalDepartment of Anesthesia and Intensive Care Rome Italy
| | - Federica Bertolotti
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”Politecnico di Milano via L. Mancinelli 7 20131 Milano Italy
| | - Patrick Scilabra
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”Politecnico di Milano via L. Mancinelli 7 20131 Milano Italy
| | - John T. Brown
- Chemistry DepartmentBall State University Muncie IN 47306 USA
| | | | - Giuseppe Resnati
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”Politecnico di Milano via L. Mancinelli 7 20131 Milano Italy
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Kumar P, Gruza B, Bojarowski SA, Dominiak PM. Extension of the transferable aspherical pseudoatom data bank for the comparison of molecular electrostatic potentials in structure-activity studies. ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES 2019; 75:398-408. [PMID: 30821272 DOI: 10.1107/s2053273319000482] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 01/09/2019] [Indexed: 12/31/2022]
Abstract
The transferable aspherical pseudoatom data bank, UBDB2018, is extended with over 130 new atom types present in small and biological molecules of great importance in biology and chemistry. UBDB2018 can be applied either as a source of aspherical atomic scattering factors in a standard X-ray experiment (dmin ≃ 0.8 Å) instead of the independent atom model (IAM), and can therefore enhance the final crystal structure geometry and refinement parameters; or as a tool to reconstruct the molecular charge-density distribution and derive the electrostatic properties of chemical systems for which 3D structural data are available. The extended data bank has been extensively tested, with the focus being on the accuracy of the molecular electrostatic potential computed for important drug-like molecules, namely the HIV-1 protease inhibitors. The UBDB allows the reconstruction of the reference B3LYP/6-31G** potentials, with a root-mean-squared error of 0.015 e bohr-1 computed for entire potential grids which span values from ca 200 e bohr-1 to ca -0.1 e bohr-1 and encompass both the inside and outside regions of a molecule. UBDB2018 is shown to be applicable to enhancing the physical meaning of the molecular electrostatic potential descriptors used to construct predictive quantitative structure-activity relationship/quantitative structure-property relationship (QSAR/QSPR) models for drug discovery studies. In addition, it is suggested that electron structure factors computed from UBDB2018 may significantly improve the interpretation of electrostatic potential maps measured experimentally by means of electron diffraction or single-particle cryo-EM methods.
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Affiliation(s)
- Prashant Kumar
- Biological and Chemical Research Centre, Department of Chemistry, University of Warsaw, ul. Żwirki i Wigury 101, Warszawa 02-089, Poland
| | - Barbara Gruza
- Biological and Chemical Research Centre, Department of Chemistry, University of Warsaw, ul. Żwirki i Wigury 101, Warszawa 02-089, Poland
| | - Sławomir Antoni Bojarowski
- Biological and Chemical Research Centre, Department of Chemistry, University of Warsaw, ul. Żwirki i Wigury 101, Warszawa 02-089, Poland
| | - Paulina Maria Dominiak
- Biological and Chemical Research Centre, Department of Chemistry, University of Warsaw, ul. Żwirki i Wigury 101, Warszawa 02-089, Poland
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