1
|
Verma SK, Ansari SN, Kumari P, Mobin SM. Click Reaction Driven, Highly Fluorescent Dinuclear Organogold(I) Complex Exhibits a Dual Role: A Rare Au···H Interaction and an Antiproliferative Agent. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00291] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
2
|
Affiliation(s)
- Teresa L. Mako
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, United States
| | - Joan M. Racicot
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, United States
| | - Mindy Levine
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, United States
| |
Collapse
|
3
|
Abstract
It is well known that various transition elements can form M···H hydrogen bonds. However, for gold, there has been limited decisive experimental evidence of such attractive interactions. Herein we demonstrate an example of spectroscopically identified hydrogen bonding interaction of C-H units to Au atoms in divalent hexagold clusters ([Au6]2+) decorated by diphosphine ligands. X-ray crystallography reveals substantially short Au-H/Au-C distances to indicate the presence of attractive interactions involving unfunctionalized C-H moieties. Solution 1H and 13C NMR signals of the C-H units appear at considerably downfield regions, indicating the hydrogen-bond character of the interactions. The Au···H interactions are critically involved in the ligand-cluster interactions to affect the stability of the cluster framework. This work demonstrates the uniqueness and potential of partially oxidised Au cluster moieties to participate in non-covalent interaction with various organic functionalities, which would expand the scope of gold clusters.Many transition metals can form hydrogen bonds to organic species, but experimental evidence for Au is still lacking. Here, the authors obtain crystallographic and NMR spectroscopic evidence of hydrogen bonding between C-H groups and Au atoms of gold clusters, suggesting that non-covalent interactions may play a role in gold cluster catalysis.
Collapse
|
4
|
Heifetz A, Barker O, Morris GB, Law R, Slack M, Biggin PC. Toward an understanding of agonist binding to human Orexin-1 and Orexin-2 receptors with G-protein-coupled receptor modeling and site-directed mutagenesis. Biochemistry 2013; 52:8246-60. [PMID: 24144388 PMCID: PMC3880013 DOI: 10.1021/bi401119m] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 10/21/2013] [Indexed: 02/06/2023]
Abstract
The class A G-protein-coupled receptors (GPCRs) Orexin-1 (OX1) and Orexin-2 (OX2) are located predominantly in the brain and are linked to a range of different physiological functions, including the control of feeding, energy metabolism, modulation of neuro-endocrine function, and regulation of the sleep-wake cycle. The natural agonists for OX1 and OX2 are two neuropeptides, Orexin-A and Orexin-B, which have activity at both receptors. Site-directed mutagenesis (SDM) has been reported on both the receptors and the peptides and has provided important insight into key features responsible for agonist activity. However, the structural interpretation of how these data are linked together is still lacking. In this work, we produced and used SDM data, homology modeling followed by MD simulation, and ensemble-flexible docking to generate binding poses of the Orexin peptides in the OX receptors to rationalize the SDM data. We also developed a protein pairwise similarity comparing method (ProS) and a GPCR-likeness assessment score (GLAS) to explore the structural data generated within a molecular dynamics simulation and to help distinguish between different GPCR substates. The results demonstrate how these newly developed methods of structural assessment for GPCRs can be used to provide a working model of neuropeptide-Orexin receptor interaction.
Collapse
Affiliation(s)
- Alexander Heifetz
- Evotec
(U.K.) Ltd., 114 Innovation
Drive, Milton Park, Abingdon, Oxfordshire OX14 4RZ, U.K.
| | - Oliver Barker
- Evotec
(U.K.) Ltd., 114 Innovation
Drive, Milton Park, Abingdon, Oxfordshire OX14 4RZ, U.K.
| | - G. Benjamin Morris
- Department
of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K.
| | - Richard
J. Law
- Evotec
(U.K.) Ltd., 114 Innovation
Drive, Milton Park, Abingdon, Oxfordshire OX14 4RZ, U.K.
| | - Mark Slack
- Evotec
AG, Manfred Eigen Campus,
Essener Bogen 7, 22419 Hamburg, Germany
| | - Philip C. Biggin
- Department
of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K.
| |
Collapse
|
5
|
Lein M, Harrison JA, Nielson AJ. Identification of non-classical C–H⋯M interactions in early and late transition metal complexes containing the CH(ArO)3 ligand. Dalton Trans 2013; 42:10939-51. [DOI: 10.1039/c3dt51028j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
|
6
|
Heifetz A, Morris GB, Biggin PC, Barker O, Fryatt T, Bentley J, Hallett D, Manikowski D, Pal S, Reifegerste R, Slack M, Law R. Study of Human Orexin-1 and -2 G-Protein-Coupled Receptors with Novel and Published Antagonists by Modeling, Molecular Dynamics Simulations, and Site-Directed Mutagenesis. Biochemistry 2012; 51:3178-97. [DOI: 10.1021/bi300136h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Alexander Heifetz
- Evotec (U.K.) Ltd., 114 Milton Park, Abingdon, Oxfordshire OX14 4SA, United Kingdom
| | - G. Benjamin Morris
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - Philip C. Biggin
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - Oliver Barker
- Evotec (U.K.) Ltd., 114 Milton Park, Abingdon, Oxfordshire OX14 4SA, United Kingdom
| | - Tara Fryatt
- Evotec (U.K.) Ltd., 114 Milton Park, Abingdon, Oxfordshire OX14 4SA, United Kingdom
| | - Jonathan Bentley
- Evotec (U.K.) Ltd., 114 Milton Park, Abingdon, Oxfordshire OX14 4SA, United Kingdom
| | - David Hallett
- Evotec (U.K.) Ltd., 114 Milton Park, Abingdon, Oxfordshire OX14 4SA, United Kingdom
| | | | - Sandeep Pal
- Evotec (U.K.) Ltd., 114 Milton Park, Abingdon, Oxfordshire OX14 4SA, United Kingdom
| | - Rita Reifegerste
- Evotec AG, Manfred Eigen Campus, Essener Bogen 7, 22419 Hamburg, Germany
| | - Mark Slack
- Evotec AG, Manfred Eigen Campus, Essener Bogen 7, 22419 Hamburg, Germany
| | - Richard Law
- Evotec (U.K.) Ltd., 114 Milton Park, Abingdon, Oxfordshire OX14 4SA, United Kingdom
| |
Collapse
|
7
|
Modeling aspects of hydrodesulfurization by molybdenum hydride compounds: Desulfurization of thiophene and benzothiophene and C–S bond cleavage of dibenzothiophene. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.11.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
8
|
Ciclosi M, Lloret J, Estevan F, Sanaú M, Pérez-Prieto J. Intramolecular apical metal-H-Csp3 interaction in molybdenum and silver complexes. Dalton Trans 2009:5077-82. [PMID: 19562166 DOI: 10.1039/b823267a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of HTIMP3 (HTIMP3=tris[1-diphenylphosphino)-3-methyl-1H-indol-2-yl]methane) with AgBF4 and Mo(CO)3(NCCH3)3 leads to Ag(HTIMP3)BF4 and Mo(CO)3(HTIMP3), respectively. The metal centre is coordinated to the three phosphorus atoms of the HTIMP3 ligand, which adopts a facial coordination mode, placing a H-Csp3 hydrogen atom at the apical position close to the metal centre. The solid-state structure of Mo(CO)3(HTIMP3) has been determined by X-ray crystallography, and the data have been used as input parameters for obtaining the optimised geometry of the complex using the B3PW91 functional. The silver structure has been modelled from the X-ray parameters of the molybdenum structure. In addition, theoretical calculations on the H-Csp3 downfield shift upon metal coordination has also been performed. They reproduce the experimental H-Csp3 chemical shifts well and supports that proton deshielding is mainly due to the presence of the metal, since the hydrogen is already located in the cone created by the aromatic-phosphino arms in the free ligand.
Collapse
Affiliation(s)
- Marco Ciclosi
- ICMOL, University Valencia, Polígono La Coma sn, 46980 Paterna, Valencia, Spain
| | | | | | | | | |
Collapse
|
9
|
Mukhopadhyay A, Pal S. Intramolecular Apical C–H···M Interactions in Square-Planar Nickel(II) Complexes with Dianionic Tridentate Ligands and 2-Phenylimidazole. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600594] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Abhik Mukhopadhyay
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India, Fax: +91‐40‐2301‐2460
| | - Samudranil Pal
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India, Fax: +91‐40‐2301‐2460
| |
Collapse
|
10
|
Filippou AC, Weidemann N, Philippopoulos AI, Schnakenburg G. Activation of Aryl Germanium(II) Chlorides by [Mo(PMe3)6] and [W(η2-CH2PMe2)H(PMe3)4]: A New Route to Metal–Germanium Triple Bonds. Angew Chem Int Ed Engl 2006; 45:5987-91. [PMID: 16927310 DOI: 10.1002/anie.200602061] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alexander C Filippou
- Institut für Anorganische Chemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany.
| | | | | | | |
Collapse
|
11
|
Filippou AC, Weidemann N, Philippopoulos AI, Schnakenburg G. Activation of Aryl Germanium(II) Chlorides by [Mo(PMe3)6] and [W(η2-CH2PMe2)H(PMe3)4]: A New Route to Metal–Germanium Triple Bonds. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200602061] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
12
|
Fischer PJ, Krohn KM, Mwenda ET, Young VG. (2-(Dimethylammonium)ethyl)cyclopentadienyltricarbonylmetalates: Group VI Metal Zwitterions. Attenuation of the Brønsted Basicity and Nucleophilicity of Formally Anionic Metal Centers. Organometallics 2005. [DOI: 10.1021/om050484d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paul J. Fischer
- Department of Chemistry, Macalester College, Saint Paul, Minnesota 55105-1899, and Department of Chemistry, X-ray Crystallographic Laboratory, University of Minnesota, Minneapolis, Minnesota 55455-0431
| | - Kristina M. Krohn
- Department of Chemistry, Macalester College, Saint Paul, Minnesota 55105-1899, and Department of Chemistry, X-ray Crystallographic Laboratory, University of Minnesota, Minneapolis, Minnesota 55455-0431
| | - Edward T. Mwenda
- Department of Chemistry, Macalester College, Saint Paul, Minnesota 55105-1899, and Department of Chemistry, X-ray Crystallographic Laboratory, University of Minnesota, Minneapolis, Minnesota 55455-0431
| | - Victor G. Young
- Department of Chemistry, Macalester College, Saint Paul, Minnesota 55105-1899, and Department of Chemistry, X-ray Crystallographic Laboratory, University of Minnesota, Minneapolis, Minnesota 55455-0431
| |
Collapse
|