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Kalhor HR, Taghikhani E. Probe into the Molecular Mechanism of Ibuprofen Interaction with Warfarin Bound to Human Serum Albumin in Comparison to Ascorbic and Salicylic Acids: Allosteric Inhibition of Anticoagulant Release. J Chem Inf Model 2021; 61:4045-4057. [PMID: 34292735 DOI: 10.1021/acs.jcim.1c00352] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The release of anticoagulant drugs such as warfarin from human serum albumin (HSA) has been important not only mechanistically but also clinically for patients who take multiple drugs simultaneously. In this study, the role of some commonly used drugs, including s-ibuprofen, ascorbic acid, and salicylic acid, was investigated in the release of warfarin bound to HSA in silico. The effects of the aforementioned drugs on the HSA-warfarin complex were investigated with molecular dynamics (MD) simulations using two approaches; in the first perspective, molecular docking was used to model the interaction of each drug with the HSA-warfarin complex, and in the second approach, drugs were positioned randomly and distant from the binary complex (HSA-warfarin) in a physiologically relevant concentration. The results obtained from both approaches indicated that s-ibuprofen and ascorbic acid both displayed allosteric effects on the release of warfarin from HSA. Although ascorbic acid aided in warfarin release, leading to destabilization of HSA, ibuprofen demonstrated a stabilizing effect on releasing the anticoagulant drug through several noncovalent interactions, including hydrophobic, electrostatic, and hydrogen-bonding interactions with the protein. The calculated binding free energy and energy contribution of involved residues using the molecular mechanics-Poisson Boltzmann surface area (MM-PBSA) method, along with root mean square deviation (RMSD) values, protein gyration, and free energy surface (FES) mapping of the protein, provided valuable details on the nature of the interactions of each drug on the release of warfarin from HSA. These results can provide important information on the mechanisms of anticoagulant release that has not been revealed in molecular details previously.
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Affiliation(s)
- Hamid Reza Kalhor
- Biochemistry Research Laboratory, Chemistry Department, Sharif University of Technology, P.O. Box 11155-3516, Tehran, Iran
| | - Elham Taghikhani
- Biochemistry Research Laboratory, Chemistry Department, Sharif University of Technology, P.O. Box 11155-3516, Tehran, Iran
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2
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Gong Q, Yu Q, Wang N, Hu J, Wang P, Yang F, Li T, You Q, Li X, Zhang X. Application of cation-π interactions in enzyme-substrate binding: Design, synthesis, biological evaluation, and molecular dynamics insights of novel hydrophilic substrates for NQO1. Eur J Med Chem 2021; 221:113515. [PMID: 33984806 DOI: 10.1016/j.ejmech.2021.113515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/21/2021] [Accepted: 04/27/2021] [Indexed: 12/15/2022]
Abstract
Cation-π interaction is a type of noncovalent interaction formed between the π-electron system and the positively charged ion or moieties. In this study, we designed a series of novel NQO1 substrates by introducing aliphatic nitrogen-containing side chains to fit with the L-shaped pocket of NQO1 by the formation of cation-π interactions. Molecular dynamics (MD) simulation indicated that the basic N atom in the side chain of NQO1 substrates, which is prone to be protonated under physiological conditions, can form cation-π interactions with the Phe232 and Phe236 residues of the NQO1 enzyme. Compound 4 with a methylpiperazinyl substituent was identified as the most efficient substrate for NQO1 with the reduction rate and catalytic efficiency of 1263 ± 61 μmol NADPH/min/μmol NQO1 and 2.8 ± 0.3 × 106 M-1s-1, respectively. Notably, compound 4 exhibited increased water solubility (110 μg/mL) compared to that of β-lap (43 μg/mL), especially under acidic condition (pH = 3, solubility > 1000 μg/mL). Compound 4 (IC50/A549 = 2.4 ± 0.6 μM) showed potent antitumor activity against NQO1-rich cancer cells through ROS generation via NQO1-mediated redox cycling. These results emphasized that the application of cation-π interactions by introducing basic aliphatic amine moiety is beneficial for both the water solubility and the NQO1-substrate binding, leading to promising NQO1-targeting antitumor candidates with improved druglike properties.
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Affiliation(s)
- Qijie Gong
- Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing, 211198, China; Department of Chemistry, China Pharmaceutical University, Nanjing, 211198, China
| | - Quanwei Yu
- Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing, 211198, China; Department of Chemistry, China Pharmaceutical University, Nanjing, 211198, China
| | - Nan Wang
- Department of Medicinal Chemistry, College of Pharmacy, University of Minnesota-Twin Cities, Minneapolis, MN, USA
| | - Jiabao Hu
- Department of Chemistry, China Pharmaceutical University, Nanjing, 211198, China
| | - Pengfei Wang
- Department of Pharmaceutical Engineering, China Pharmaceutical University, Nanjing, 211198, China
| | - Fulai Yang
- Department of Chemistry, China Pharmaceutical University, Nanjing, 211198, China
| | - Tian Li
- Department of Pharmaceutical Engineering, China Pharmaceutical University, Nanjing, 211198, China
| | - Qidong You
- Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing, 211198, China.
| | - Xiang Li
- Department of Pharmaceutical Engineering, China Pharmaceutical University, Nanjing, 211198, China.
| | - Xiaojin Zhang
- Jiangsu Key Laboratory of Drug Design and Optimization, China Pharmaceutical University, Nanjing, 211198, China; Department of Chemistry, China Pharmaceutical University, Nanjing, 211198, China.
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Qian K, Chen H, Qu C, Qi J, Du B, Ko T, Xiang Z, Kandawa-Schulz M, Wang Y, Cheng Z. Mitochondria-targeted delocalized lipophilic cation complexed with human serum albumin for tumor cell imaging and treatment. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2020; 23:102087. [DOI: 10.1016/j.nano.2019.102087] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 08/13/2019] [Accepted: 08/13/2019] [Indexed: 11/26/2022]
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4
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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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5
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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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Berts I, Fragneto G, Porcar L, Hellsing MS, Rennie AR. Controlling adsorption of albumin with hyaluronan on silica surfaces and sulfonated latex particles. J Colloid Interface Sci 2017; 504:315-324. [DOI: 10.1016/j.jcis.2017.05.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 05/11/2017] [Accepted: 05/12/2017] [Indexed: 01/08/2023]
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7
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Gold nanoparticles increases UV and thermal stability of human serum albumin. Biointerphases 2016; 11:04B310. [PMID: 27984858 DOI: 10.1116/1.4972113] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Ultraviolet (UV) radiation, temperature, and time can degrade proteins. Here, the authors show that gold nanoparticles significantly protect human serum albumin from denaturation when exposed to "stressing" conditions such as UV irradiation and sustained exposure in suboptimal conditions. In particular, the authors show that gold nanoparticles significantly reduce the decrease in secondary structure induced by UV irradiation or extended exposure to ambient temperature.
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Competitive binding of anticancer drugs 5-fluorouracil and cyclophosphamide with serum albumin: Calorimetric insights. Biochim Biophys Acta Gen Subj 2016; 1860:917-929. [DOI: 10.1016/j.bbagen.2016.01.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 01/27/2016] [Accepted: 01/30/2016] [Indexed: 11/22/2022]
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Hushegyi A, Bertok T, Damborsky P, Katrlik J, Tkac J. An ultrasensitive impedimetric glycan biosensor with controlled glycan density for detection of lectins and influenza hemagglutinins. Chem Commun (Camb) 2015; 51:7474-7. [PMID: 25828081 PMCID: PMC4883646 DOI: 10.1039/c5cc00922g] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
An impedimetric glycan biosensor with optimised glycan density was applied for the detection of lectins and influenza hemagglutinins down to attomolar concentrations (aM).
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Affiliation(s)
- A Hushegyi
- Department of Glycobiotechnology, Institute of Chemistry, Slovak Academy of Sciences, Dubravska cesta 9, 845 38 Bratislava, Slovakia.
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Jacroux T, Bottenus D, Rieck B, Ivory CF, Dong WJ. Cationic isotachophoresis separation of the biomarker cardiac troponin I from a high-abundance contaminant, serum albumin. Electrophoresis 2014; 35:2029-38. [PMID: 24723384 DOI: 10.1002/elps.201400009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 02/27/2014] [Accepted: 03/16/2014] [Indexed: 11/11/2022]
Abstract
Cationic ITP was used to separate and concentrate fluorescently tagged cardiac troponin I (cTnI) from two proteins with similar isoelectric properties in a PMMA straight-channel microfluidic chip. In an initial set of experiments, cTnI was effectively separated from R-Phycoerythrin using cationic ITP in a pH 8 buffer system. Then, a second set of experiments was conducted in which cTnI was separated from a serum contaminant, albumin. Each experiment took ∼10 min or less at low electric field strengths (34 V/cm) and demonstrated that cationic ITP could be used as an on-chip removal technique to isolate cTnI from albumin. In addition to the experimental work, a 1D numerical simulation of our cationic ITP experiments has been included to qualitatively validate experimental observations.
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Affiliation(s)
- Thomas Jacroux
- Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA
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11
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Wołoszyn Ł, Ilczyszyn M, Ilczyszyn MM. Experimental evidence on interaction between xenon and bovine serum albumin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 125:449-452. [PMID: 24613623 DOI: 10.1016/j.saa.2014.02.062] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 01/29/2014] [Accepted: 02/11/2014] [Indexed: 06/03/2023]
Abstract
Xenon gas interacts with bovine serum albumin (BSA) dissolved in a physiological buffer solution. The fluorescence quenching related to the Trp emission is reversible and depends linearly on the time of saturation by Xe. The most probable site of this interaction is Trp212. The common emission of all BSA fluorophores is also influenced by Xe but this quenching is more complex and suggests: (i) at least two sites occupied by Xe and related to the Tyr and Trp residues; (ii) structural variations of BSA induced by the Xe guest atoms.
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Affiliation(s)
- Łukasz Wołoszyn
- Faculty of Chemistry, Wrocław University, Joliot Curie 14, 50-383 Wrocław, Poland
| | - Marek Ilczyszyn
- Faculty of Chemistry, Wrocław University, Joliot Curie 14, 50-383 Wrocław, Poland.
| | - Maria M Ilczyszyn
- Faculty of Chemistry, Wrocław University, Joliot Curie 14, 50-383 Wrocław, Poland
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12
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Novel insights into the pleiotropic effects of human serum albumin in health and disease. Biochim Biophys Acta Gen Subj 2013; 1830:5486-93. [DOI: 10.1016/j.bbagen.2013.04.012] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Revised: 04/05/2013] [Accepted: 04/08/2013] [Indexed: 01/09/2023]
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13
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COŞKUN ÖZLEM, NURTEN RÜSTEM. Purification of NAD+ glycohydrolase from human serum. Oncol Lett 2013; 6:227-231. [PMID: 23946809 PMCID: PMC3742813 DOI: 10.3892/ol.2013.1335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Accepted: 04/03/2013] [Indexed: 11/14/2022] Open
Abstract
In the present study, NAD+ glycohydrolase was purified from serum samples collected from healthy individuals using ammonium sulfate fractionation, Affi-Gel blue (Cibacron Blue F3GA) affinity chromatography, Sephadex G-100 column chromatography and isoelectric focusing. The final step was followed by a second Sephadex G-100 column chromatography assay in order to remove the ampholytes from the isoelectric focusing step. In terms of enhancement of specific activity, the NAD+ glycohydrolase protein was purified ∼480-fold, with a yield of 1% compared with the initial serum fraction. The purified fraction appeared to be homogeneous, with a molecular weight of 39 kDa, as revealed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis, and also corresponded to the soluble (monomeric) form of surface antigen CD38.
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14
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Khan AY, Hossain M, Kumar GS. Binding of plant alkaloids berberine and palmatine to serum albumins: a thermodynamic investigation. Mol Biol Rep 2012; 40:553-66. [DOI: 10.1007/s11033-012-2092-z] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 10/03/2012] [Indexed: 01/29/2023]
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Zhou R, Perez-Aguilar JM, Meng Q, Saven JG, Liu R. Opioid binding sites in human serum albumin. Anesth Analg 2011; 114:122-8. [PMID: 22025496 DOI: 10.1213/ane.0b013e318232e922] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Human serum albumin (HSA) is an important carrier for opioids. However, the locations of the binding sites remain unclear. In the present study, we have characterized opioid-HSA interactions using multiple biochemical and biophysical techniques to reveal: (a) the location of the binding site(s); (b) whether naloxone shares the binding site with morphine; and (c) whether opioid agonists share their binding site(s) with general anesthetics. METHODS Elution chromatography to determine the global interactions and tryptophan intrinsic fluorescence to determine the localized interactions of opioids with HSA were used. Competition studies using isothermal titration calorimetry were used to determine the overlap of binding site(s) among opioid agonists, antagonists, and general anesthetics. An automatic docking calculation was used to predict the possible binding sites and to assess findings of the solution studies. RESULTS For elution chromatography with immobilized HSA, the retention times of naloxone, morphine, and fentanyl were prolonged but shorter than that of propofol. The inhibition of tryptophan fluorescence by naloxone was not affected by morphine or fentanyl. The calorimetric heat profiles of propofol and halothane interaction with HSA were changed significantly, but not equally by morphine, naloxone, or fentanyl. Consistent with direct binding studies, docking results demonstrated that opioids share sites with general anesthetics; a distinct binding site for naloxone was revealed near the sole tryptophan in HSA that is not shared with morphine. CONCLUSIONS The interaction of opioids with HSA is weak in comparison with propofol. Naloxone has a distinct binding site in HSA not shared with opioid agonists. Opioids share binding sites with general anesthetics in HSA.
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Affiliation(s)
- Renlong Zhou
- Department of Anesthesiology and Critical Care, University of Pennsylvania, Philadelphia, 19104, USA
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Ramanathan K, Shanthi V, Sethumadhavan R. A compact review on the comparison of conventional and non-conventional interactions on the structural stability of therapeutic proteins. Interdiscip Sci 2011; 3:144-60. [PMID: 21541844 DOI: 10.1007/s12539-011-0082-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Revised: 06/21/2010] [Accepted: 06/24/2010] [Indexed: 11/28/2022]
Abstract
Therapeutic proteins carry out the most difficult tasks in living cells. They do so by interacting specifically with other molecules. This requires that they fold to a unique and more stable conformation. A prerequisite for comprehending the folding processes in their immense complexity entails a thorough understanding of many weak interactions. The purpose of this review is to systematically study the role of weak interactions such as cation-π, C-H......π, N-H......π and O-H......π, in the set of 49 therapeutic proteins. The importance of many of these interactions (for example, cationic residues interacting with π system) is revealed by the higher degree of conservation observed for them in protein structures. These interactions are mainly formed by long-range contacts and significant percentage of cation-π, C-H......π, N-H......π and O-H......π interacting residues had one or more stabilization centers. Further, a comparison of conventional and nonconventional interactions in the present data set unambiguously highlights the significance of these weak interactions in the structural stability of therapeutic proteins. We propose that the incorporation of the entirety of these interactions leads to a more complete description of the problem, and that this could provide new perspectives and new possible answers.
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Affiliation(s)
- K Ramanathan
- School of Biosciences and Technology, Vellore Institute of Technology, Vellore, 632014, Tamil Nadu, India
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Tayubi IA, Sethumadhavan R. Nature of cation-pi interactions and their role in structural stability of immunoglobulin proteins. BIOCHEMISTRY (MOSCOW) 2010; 75:912-8. [PMID: 20673216 DOI: 10.1134/s000629791007014x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Cation-pi interactions are known to be important contributors to protein stability and ligand-protein interactions. In this study, we have analyzed the influence of cation-pi interactions in single chain immunoglobulin proteins. We observed 87 cation-pi interactions in a data set of 33 proteins. These interactions are mainly formed by long-range contacts, and there is preference of Arg over Lys in these interactions. Arg-Tyr interactions are predominant among the various pairs analyzed. Despite the scarcity of interactions involving Trp, the average energy for Trp-cation interactions is quite high. This information suggests that the cation-pi interactions involving Trp might be of high relevance to the proteins. Secondary structure analysis reveals that cation-pi interactions are formed preferably between residues in which at least one is in beta-strand. Proteins having beta-strand regions have the highest number of cation-pi interaction-forming residues.
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Affiliation(s)
- I A Tayubi
- Vellore Institute of Technology, Tamil Nadu, India.
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18
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Inhaled Anesthetics Promote Albumin Dimerization through Reciprocal Exchange of Subdomains. Biochem Res Int 2010; 2010:516704. [PMID: 21188076 PMCID: PMC3005971 DOI: 10.1155/2010/516704] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2009] [Revised: 12/09/2009] [Accepted: 01/14/2010] [Indexed: 11/18/2022] Open
Abstract
Inhaled anesthetics affect protein-protein interaction, but the mechanisms underlying these effects are still poorly understood. We examined the impact of sevoflurane and isoflurane on the dimerization of human serum albumin (HSA), a protein with anesthetic binding sites that are well characterized. Intrinsic fluorescence emission was analyzed for spectral shifting and self-quenching, and control first derivatives (spectral responses to changes in HSA concentration) were compared against those obtained from samples treated with sevoflurane or isoflurane. Sevoflurane increased dimer-dependent self-quenching and both decreased oligomer-dependent spectral shifting, suggesting that inhaled anesthetics promoted HSA dimerization. Size exclusion chromatography and polarization data were consistent with these observations. The data support the proposed model of a reciprocal exchange of subdomains to form an HSA dimer. The open-ended exchange of subdomains, which we propose occuring in HSA oligomers, was inhibited by sevoflurane and isoflurane.
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Liu R, Yang J, Ha CE, Bhagavan N, Eckenhoff R. Truncated human serum albumin retains general anaesthetic binding activity. Biochem J 2009; 388:39-45. [PMID: 15634193 PMCID: PMC1186691 DOI: 10.1042/bj20041224] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Multiple binding sites for anaesthetics in HSA (human serum albumin) make solution studies difficult to interpret. In the present study, we expressed the wild-type HSA domain 3 (wtHSAd3), a peptide with two known anaesthetic binding sites in a yeast expression system. We also expressed a site-directed mutant of domain 3 (Y411Wd3). The stability and secondary structure of the constructed fragments were determined by HX (hydrogen-tritium exchange) and CD spectroscopy. The binding of two general anaesthetics, 2-bromo-2-chloro-1,1,1-trifluoroethane and propofol, to wtHSAd3 and Y411Wd3 was determined using isothermal titration calorimetry, HX and intrinsic tryptophan fluorescence quenching. Although the expressed fragments are less stable than intact wtHSA as indicated by both CD and HX, they retain the secondary structure and anaesthetic-binding characteristics of an intact HSA molecule, but with fewer binding sites. Y411Wd3 had decreased affinity for propofol but not for 2-bromo-2-chloro-1,1,1-trifluoroethane, consistent with steric hindrance. Retention of structural features and anaesthetic binding properties with fewer binding sites in this truncated protein provide feasibility for using scaled-down models of otherwise intractable systems to gain an understanding of anaesthetic binding requirements and binding-stability relationships.
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Affiliation(s)
- Renyu Liu
- *Department of Anesthesia, University of Pennsylvania Medical Center, 3400 Spruce Street, 7 Dulles, Philadelphia, PA 19104-4283, U.S.A
| | - Jinsheng Yang
- †Department of Biochemistry and Biophysics, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI 96822, U.S.A
| | - Chung-Eun Ha
- †Department of Biochemistry and Biophysics, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI 96822, U.S.A
| | - Nadhipuram V. Bhagavan
- †Department of Biochemistry and Biophysics, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI 96822, U.S.A
| | - Roderic G. Eckenhoff
- *Department of Anesthesia, University of Pennsylvania Medical Center, 3400 Spruce Street, 7 Dulles, Philadelphia, PA 19104-4283, U.S.A
- To whom correspondence should be addressed (email )
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A comparative study on specific and nonspecific interactions in bovine serum albumin: thermal and volume effects of halothane and palmitic acid. Colloid Polym Sci 2009. [DOI: 10.1007/s00396-009-2054-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Tormo L, Organero JÁ, Cohen B, Martin C, Santos L, Douhal A. Dynamical and Structural Changes of an Anesthetic Analogue in Chemical and Biological Nanocavities. J Phys Chem B 2008; 112:13641-7. [DOI: 10.1021/jp803083y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Laura Tormo
- Departamento de Química Física, Sección de Químicas, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avda. Carlos III, s/n, 45071 Toledo, Spain, and Departamento de Química Física, Facultad de Ciencias, Avda Camilo José Cela 13071, Ciudad Real, Spain
| | - Juan Ángel Organero
- Departamento de Química Física, Sección de Químicas, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avda. Carlos III, s/n, 45071 Toledo, Spain, and Departamento de Química Física, Facultad de Ciencias, Avda Camilo José Cela 13071, Ciudad Real, Spain
| | - Boiko Cohen
- Departamento de Química Física, Sección de Químicas, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avda. Carlos III, s/n, 45071 Toledo, Spain, and Departamento de Química Física, Facultad de Ciencias, Avda Camilo José Cela 13071, Ciudad Real, Spain
| | - Cristina Martin
- Departamento de Química Física, Sección de Químicas, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avda. Carlos III, s/n, 45071 Toledo, Spain, and Departamento de Química Física, Facultad de Ciencias, Avda Camilo José Cela 13071, Ciudad Real, Spain
| | - Lucia Santos
- Departamento de Química Física, Sección de Químicas, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avda. Carlos III, s/n, 45071 Toledo, Spain, and Departamento de Química Física, Facultad de Ciencias, Avda Camilo José Cela 13071, Ciudad Real, Spain
| | - Abderrazzak Douhal
- Departamento de Química Física, Sección de Químicas, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Avda. Carlos III, s/n, 45071 Toledo, Spain, and Departamento de Química Física, Facultad de Ciencias, Avda Camilo José Cela 13071, Ciudad Real, Spain
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Seto T, Isogai H, Ozaki M, Nosaka S. Noble Gas Binding to Human Serum Albumin Using Docking Simulation: Nonimmobilizers and Anesthetics Bind to Different Sites. Anesth Analg 2008; 107:1223-8. [DOI: 10.1213/ane.0b013e31817f1317] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Thoppil AA, Sharma R, Kishore N. Complexation of β-lactam antibiotic drug carbenicillin to bovine serum albumin: Energetics and conformational studies. Biopolymers 2008; 89:831-40. [DOI: 10.1002/bip.21021] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Role of cation–π interactions in single chain ‘all-alpha’ proteins. J Theor Biol 2008; 250:655-62. [DOI: 10.1016/j.jtbi.2007.10.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2007] [Revised: 10/22/2007] [Accepted: 10/22/2007] [Indexed: 11/21/2022]
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Streiff JH, Allen TW, Atanasova E, Juranic N, Macura S, Penheiter AR, Jones KA. Prediction of volatile anesthetic binding sites in proteins. Biophys J 2006; 91:3405-14. [PMID: 16877516 PMCID: PMC1614498 DOI: 10.1529/biophysj.106.082586] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
Computational methods designed to predict and visualize ligand protein binding interactions were used to characterize volatile anesthetic (VA) binding sites and unoccupied pockets within the known structures of VAs bound to serum albumin, luciferase, and apoferritin. We found that both the number of protein atoms and methyl hydrogen, which are within approximately 8 A of a potential ligand binding site, are significantly greater in protein pockets where VAs bind. This computational approach was applied to structures of calmodulin (CaM), which have not been determined in complex with a VA. It predicted that VAs bind to [Ca(2+)](4)-CaM, but not to apo-CaM, which we confirmed with isothermal titration calorimetry. The VA binding sites predicted for the structures of [Ca(2+)](4)-CaM are located in hydrophobic pockets that form when the Ca(2+) binding sites in CaM are saturated. The binding of VAs to these hydrophobic pockets is supported by evidence that halothane predominantly makes contact with aliphatic resonances in [Ca(2+)](4)-CaM (nuclear Overhauser effect) and increases the Ca(2+) affinity of CaM (fluorescence spectroscopy). Our computational analysis and experiments indicate that binding of VA to proteins is consistent with the hydrophobic effect and the Meyer-Overton rule.
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Affiliation(s)
- John H Streiff
- Departments of Anesthesiology and Molecular Pharmacology and Experimental Therapeutics and Biochemistry and Molecular Biology, Mayo College of Medicine, Rochester, Minnesota, USA.
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Solt K, Johansson JS, Raines DE. Kinetics of anesthetic-induced conformational transitions in a four-alpha-helix bundle protein. Biochemistry 2006; 45:1435-41. [PMID: 16445285 PMCID: PMC2581500 DOI: 10.1021/bi052206o] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Inhaled anesthetics are thought to alter the conformational states of Cys-loop ligand-gated ion channels (LGICs) by binding within discrete cavities that are lined by portions of four alpha-helical transmembrane domains. Because Cys-loop LGICs are complex molecules that are notoriously difficult to express and purify, scaled-down models have been used to better understand the basic molecular mechanisms of anesthetic action. In this study, stopped-flow fluorescence spectroscopy was used to define the kinetics with which inhaled anesthetics interact with (Aalpha(2)-L1M/L38M)(2), a four-alpha-helix bundle protein that was designed to model anesthetic binding sites on Cys-loop LGICs. Stopped-flow fluorescence traces obtained upon mixing (Aalpha(2)-L1M/L38M)(2) with halothane revealed immediate, fast, and slow components of quenching. The immediate component, which occurred within the mixing time of the spectrofluorimeter, was attributed to direct quenching of tryptophan fluorescence upon halothane binding to (Aalpha(2)-L1M/L38M)(2). This was followed by a biexponential fluorescence decay containing fast and slow components, reflecting anesthetic-induced conformational transitions. Fluorescence traces obtained in studies using sevoflurane, isoflurane, and desflurane, which poorly quench tryptophan fluorescence, did not contain the immediate component. However, these anesthetics did produce the fast and slow components, indicating that they also alter the conformation of (Aalpha(2)-L1M/L38M)(2). Cyclopropane, an anesthetic that acts with unusually low potency on Cys-loop LGICs, acted with low apparent potency on (Aalpha(2)-L1M/L38M)(2). These results suggest that four-alpha-helix bundle proteins may be useful models of in vivo sites of action that allow the use of a wide range of techniques to better understand how anesthetic binding leads to changes in protein structure and function.
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Affiliation(s)
| | | | - Douglas E. Raines
- Corresponding author. Address: Department of Anesthesia and Critical Care, Massachusetts General Hospital, 55 Fruit Street, Clinics Building 3, Boston MA 02114. Telephone: (617) 724−0343. Fax: (617) 724−8644. E-mail:
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27
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Liu R, Loll PJ, Eckenhoff RG. Structural basis for high‐affinity volatile anesthetic binding in a natural 4‐helix bundle protein. FASEB J 2005; 19:567-76. [PMID: 15791007 DOI: 10.1096/fj.04-3171com] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Physiologic sites for inhaled anesthetics are presumed to be cavities within transmembrane 4-alpha-helix bundles of neurotransmitter receptors, but confirmation of binding and structural detail of such sites remains elusive. To provide such detail, we screened soluble proteins containing this structural motif, and found only one that exhibited evidence of strong anesthetic binding. Ferritin is a 24-mer of 4-alpha-helix bundles; both halothane and isoflurane bind with K(A) values of approximately 10(5) M(-1), higher than any previously reported inhaled anesthetic-protein interaction. The crystal structures of the halothane/apoferritin and isoflurane/apoferritin complexes were determined at 1.75 A resolution, revealing a common anesthetic binding pocket within an interhelical dimerization interface. The high affinity is explained by several weak polar contacts and an optimal host/guest packing relationship. Neither the acidic protons nor ether oxygen of the anesthetics contribute to the binding interaction. Compared with unliganded apoferritin, the anesthetic produced no detectable alteration of structure or B factors. The remarkably high affinity of the anesthetic/apoferritin complex implies greater selectivity of protein sites than previously thought, and suggests that direct protein actions may underlie effects at lower than surgical levels of anesthetic, including loss of awareness.
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Affiliation(s)
- Renyu Liu
- Department of Anesthesia, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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28
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Ghirlanda G, Hilcove SA, Pidikiti R, Johansson JS, Lear JD, Degrado WF, Eckenhoff RG. Volatile anesthetic modulation of oligomerization equilibria in a hexameric model peptide. FEBS Lett 2004; 578:140-4. [PMID: 15581631 DOI: 10.1016/j.febslet.2004.10.087] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2004] [Revised: 10/29/2004] [Accepted: 10/31/2004] [Indexed: 11/15/2022]
Abstract
To determine if occupancy of interfacial pockets in oligomeric proteins by volatile anesthetic molecules can allosterically regulate oligomerization equilibria, variants of a three-helix bundle peptide able to form higher oligomers were studied with analytical ultracentrifugation, hydrogen exchange and modeling. Halothane shifted the oligomerization equilibria towards the oligomer only in a mutation predicted to create sufficient volume in the hexameric pocket. Other mutations at this residue, predicted to create a too small or too polar pocket, were unaffected by halothane. Inhaled anesthetic modulation of oligomerization interactions is a novel and potentially generalizable biophysical basis for some anesthetic actions.
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Affiliation(s)
- Giovanna Ghirlanda
- Department of Biophysics and Biochemistry, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA
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29
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Liu R, Meng Q, Xi J, Yang J, Ha CE, Bhagavan NV, Eckenhoff RG. Comparative binding character of two general anaesthetics for sites on human serum albumin. Biochem J 2004; 380:147-52. [PMID: 14759223 PMCID: PMC1224140 DOI: 10.1042/bj20031652] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2003] [Revised: 01/21/2004] [Accepted: 02/03/2004] [Indexed: 11/17/2022]
Abstract
Propofol and halothane are clinically used general anaesthetics, which are transported primarily by HSA (human serum albumin) in the blood. Binding characteristics are therefore of interest for both the pharmacokinetics and pharmacodynamics of these drugs. We characterized anaesthetic-HSA interactions in solution using elution chromatography, ITC (isothermal titration calorimetry), hydrogen-exchange experiments and geometric analyses of high-resolution structures. Binding affinity of propofol to HSA was determined to have a K(d) of 65 microM and a stoichiometry of approx. 2, whereas the binding of halothane to HSA showed a K(d) of 1.6 mM and a stoichiometry of approx. 7. Anaesthetic-HSA interactions are exothermic, with propofol having a larger negative enthalpy change relative to halothane. Hydrogen-exchange studies in isolated recombinant domains of HSA showed that propofol-binding sites are primarily found in domain III, whereas halothane sites are more widely distributed. Both location and stoichiometry from these solution studies agree with data derived from X-ray crystal-structure studies, and further analyses of the architecture of sites from these structures suggested that greater hydrophobic contacts, van der Waals interactions and hydrogen-bond formation account for the stronger binding of propofol as compared with the less potent anaesthetic, halothane.
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Affiliation(s)
- Renyu Liu
- Department of Anesthesia, University of Pennsylvania Medical Center, 335 John Morgan Building, 3620 Hamilton Walk, Philadelphia, PA 19104-6112, USA
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Raines DE, Gioia F, Claycomb RJ, Stevens RJ. The N-Methyl-d-aspartate Receptor Inhibitory Potencies of Aromatic Inhaled Drugs of Abuse: Evidence for Modulation by Cation-π Interactions. J Pharmacol Exp Ther 2004; 311:14-21. [PMID: 15166258 DOI: 10.1124/jpet.104.069930] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Benzene and several close structural analogs are inhaled drugs of abuse with general anesthetic activity. By virtue of their pi electron clouds, they may engage in attractive electrostatic interactions with cationic atomic charges on protein targets. In this study, we tested the hypothesis that inhaled drugs of abuse inhibit human N-methyl-D-aspartate (NMDA) receptors with potencies that correlate with their abilities to engage in cation-pi interactions. Electrophysiological techniques were used to define the NR1/NR2B NMDA receptor inhibitory concentrations of volatile benzene analogs, and computer modeling was used to quantify their abilities to engage in cation-pi interactions and their molecular volumes. In addition, each compound's octanol/gas partition coefficient (a measure of hydrophobicity) was quantified. All 18 compounds inhibited human NR1/NR2B NMDA receptors reversibly and in a concentration-dependent manner. NMDA receptor inhibitory potency correlated strongly with the ability to engage in cation-pi interactions, weakly with hydrophobicity, and was independent of molecular volume. This is consistent with the hypothesis that cation-pi interactions enhance the binding of inhaled drugs of abuse to the NMDA receptor and suggests that the receptor binding site(s) for these drugs possesses significant cationic character.
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Affiliation(s)
- Douglas E Raines
- Department of Anesthesia and Critical Care, Massachusetts General Hospital, 55 Fruit St., Boston, MA 02114, USA.
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31
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Binkowski TA, Naghibzadeh S, Liang J. CASTp: Computed Atlas of Surface Topography of proteins. Nucleic Acids Res 2003; 31:3352-5. [PMID: 12824325 PMCID: PMC168919 DOI: 10.1093/nar/gkg512] [Citation(s) in RCA: 498] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2003] [Accepted: 03/06/2003] [Indexed: 11/13/2022] Open
Abstract
Computed Atlas of Surface Topography of proteins (CASTp) provides an online resource for locating, delineating and measuring concave surface regions on three-dimensional structures of proteins. These include pockets located on protein surfaces and voids buried in the interior of proteins. The measurement includes the area and volume of pocket or void by solvent accessible surface model (Richards' surface) and by molecular surface model (Connolly's surface), all calculated analytically. CASTp can be used to study surface features and functional regions of proteins. CASTp includes a graphical user interface, flexible interactive visualization, as well as on-the-fly calculation for user uploaded structures. CASTp is updated daily and can be accessed at http://cast.engr.uic.edu.
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Affiliation(s)
- T Andrew Binkowski
- Department of Bioengineering, MC-063, University of Illinois at Chicago, 851 S. Morgan Street, Chicago, IL 60607, USA
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