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Mascharak PK. Nitric oxide delivery platforms derived from a photoactivatable Mn(II) nitrosyl complex: Entry to photopharmacology. J Inorg Biochem 2022; 231:111804. [DOI: 10.1016/j.jinorgbio.2022.111804] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 02/17/2022] [Accepted: 03/14/2022] [Indexed: 12/13/2022]
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2
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Chiang CK, Chu KT, Lin CC, Xie SR, Liu YC, Demeshko S, Lee GH, Meyer F, Tsai ML, Chiang MH, Lee CM. Photoinduced NO and HNO Production from Mononuclear {FeNO}6 Complex Bearing a Pendant Thiol. J Am Chem Soc 2020; 142:8649-8661. [DOI: 10.1021/jacs.9b13837] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Chuan-Kuei Chiang
- Department of Applied Science, National Taitung University, Taitung 950, Taiwan
| | - Kai-Ti Chu
- Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan
| | - Chia-Chin Lin
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 804, Taiwan
| | - Shi-Rou Xie
- Department of Applied Science, National Taitung University, Taitung 950, Taiwan
| | - Yu-Chiao Liu
- Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan
| | - Serhiy Demeshko
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstraße 4, D-37077 Göttingen, Germany
| | - Gene-Hsiang Lee
- Instrumentation Center, National Taiwan University, Taipei 107, Taiwan
| | - Franc Meyer
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstraße 4, D-37077 Göttingen, Germany
| | - Ming-Li Tsai
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 804, Taiwan
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan
| | - Ming-Hsi Chiang
- Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan
| | - Chien-Ming Lee
- Department of Applied Science, National Taitung University, Taitung 950, Taiwan
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3
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Chang CH, Richards NGJ. Intrinsic Carbon-Carbon Bond Reactivity at the Manganese Center of Oxalate Decarboxylase from Density Functional Theory. J Chem Theory Comput 2015; 1:994-1007. [PMID: 26641915 DOI: 10.1021/ct050063d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The detailed manganese-dependent chemistry employed by oxalate decarboxylase (OxDC) to catalyze the nonoxidative decarboxylation of oxalic acid remains poorly understood. For example, enzyme activity requires the presence of dioxygen even though this compound is not a formal substrate in the reaction. We now report density functional theory (DFT) calculations upon a series of hypothetical OxDC active site model structures. Our results suggest that the function of the metal ion may be to position dioxygen and oxalate such that electrons can be shuttled directly between these species, thereby removing the need for the existence of Mn(III) as an intermediate in the mechanism. These calculations also indicate that the intrinsic, gas-phase reactivity of the Bacillus subtilis oxalate decarboxylase active center is to oxidize oxalate. Since this reactivity is not observed for OxDC, our DFT results suggest that protein environment modulates the intrinsic metallocenter reactivity, presumably by affecting the electronic distribution at the manganese center during catalysis.
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Affiliation(s)
- Christopher H Chang
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200
| | - Nigel G J Richards
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200
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4
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The Active Site of Nitrile Hydratase: An Assembly of Unusual Coordination Features by Nature. MOLECULAR DESIGN IN INORGANIC BIOCHEMISTRY 2013. [DOI: 10.1007/430_2012_85] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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5
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Zheng W, Wu S, Zhao S, Geng Y, Jin J, Su Z, Fu Q. Carbonyl Amine/Schiff Base Ligands in Manganese Complexes: Theoretical Study on the Mechanism, Capability of NO Release. Inorg Chem 2012; 51:3972-80. [DOI: 10.1021/ic2011953] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Weili Zheng
- Institute of Functional Material Chemistry, Faculty
of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
| | - Shuixing Wu
- Institute of Functional Material Chemistry, Faculty
of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
| | - Shanshan Zhao
- Institute of Functional Material Chemistry, Faculty
of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
| | - Yun Geng
- Institute of Functional Material Chemistry, Faculty
of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
| | - Junling Jin
- Institute of Functional Material Chemistry, Faculty
of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
| | - Zhongmin Su
- Institute of Functional Material Chemistry, Faculty
of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
| | - Qiang Fu
- Institute of Functional Material Chemistry, Faculty
of Chemistry, Northeast Normal University, Changchun 130024, Jilin, People’s Republic of China
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6
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Fry NL, Mascharak PK. Photolability of NO in designed metal nitrosyls with carboxamido-N donors: a theoretical attempt to unravel the mechanism. Dalton Trans 2012; 41:4726-35. [PMID: 22388493 DOI: 10.1039/c2dt12470j] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
During the past few years, photoactive metal nitrosyls (NO complexes of metals) have drawn attention as potential drugs for delivery of nitric oxide (NO) to biological targets under the control of light. Major success in this area has been achieved with designed metal nitrosyls derived from ligands that contain carboxamide group(s). A number of iron, manganese and ruthenium {MNO}(6) nitrosyls of such kind exhibit excellent NO photolability under low-power visible and near-IR light. The results of theoretical studies on these NO-donors have provided insight into (a) the electronic transitions that lead to photorelease of NO and (b) the structural features of the ligands that dictate the sensitivity of the nitrosyls to light of specific wavelengths. In addition, the results have afforded clear understanding of the electronic configurations of the various nitrosyls. This article highlights these results in a coherent manner. Good matches between the predicted and observed spectral features and NO photolability strongly suggest that theoretical studies should be an integral part of the smart design of such NO-donors in the future research.
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Affiliation(s)
- Nicole L Fry
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA
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7
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Bohlender C, Wolfram M, Goerls H, Imhof W, Menzel R, Baumgaertel A, Schubert US, Mueller U, Frigge M, Schnabelrauch M, Wyrwa R, Schiller A. Light-triggered NO release from a nanofibrous non-woven. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15410b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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8
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Merkle AC, Fry NL, Mascharak PK, Lehnert N. Mechanism of NO Photodissociation in Photolabile Manganese–NO Complexes with Pentadentate N5 Ligands. Inorg Chem 2011; 50:12192-203. [DOI: 10.1021/ic201967f] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Anna C. Merkle
- Department of Chemistry, University of Michigan, 930 North University Avenue,
Ann Arbor, Michigan 48109-1055, United States
| | - Nicole L. Fry
- Department of Chemistry and
Biochemistry, University of California,
Santa Cruz, California 95064, United States
| | - Pradip K. Mascharak
- Department of Chemistry and
Biochemistry, University of California,
Santa Cruz, California 95064, United States
| | - Nicolai Lehnert
- Department of Chemistry, University of Michigan, 930 North University Avenue,
Ann Arbor, Michigan 48109-1055, United States
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9
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Fry NL, Zhao XP, Mascharak PK. Density functional theory studies on a designed photoactive {FeNO}6 nitrosyl and the corresponding photoinactive {FeNO}7 species: Insight into the origin of NO photolability. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.12.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Liu CG, Guan W, Yan LK, Su ZM. Quantum chemical characterization of the generation of high-valent oxoruthenium species of Keggin type polyoxometalates: electronic structure and bonding features. Dalton Trans 2011; 40:2967-74. [DOI: 10.1039/c0dt01085e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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11
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Fry NL, Rose MJ, Rogow DL, Nyitray C, Kaur M, Mascharak PK. Ruthenium nitrosyls derived from tetradentate ligands containing carboxamido-N and phenolato-o donors: syntheses, structures, photolability, and time dependent density functional theory studies. Inorg Chem 2010; 49:1487-95. [PMID: 20063858 DOI: 10.1021/ic9017129] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In order to examine the role(s) of designed ligands on the NO photolability of {Ru-NO}(6) nitrosyls, a set of three nitrosyls with ligands containing two carboxamide groups along with a varying number of phenolates have been synthesized. The nitrosyls namely, (NEt(4))(2)[(hybeb)Ru(NO)(OEt)] (1), (PPh(4))[(hypyb)Ru(NO)(OEt)] (2), and [(bpb)Ru(NO)(OEt)] (3) have been characterized by X-ray crystallography. Complexes 1-3 are diamagnetic, exhibit nu(NO) in the range 1780-1840 cm(-1) and rapidly release NO in solution upon exposure to low power UV light (7 mW/cm(2)). Density Functional Theory (DFT) and Time Dependent DFT (TDDFT) calculations on 1-3 indicate considerable contribution of ligand orbitals in the MOs involved in transitions leading to NO photolability. The results of the theoretical studies match well with the experimental absorption spectra as well as the parameters for NO photorelease and provide insight into the transition(s) associated with loss of NO.
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Affiliation(s)
- Nicole L Fry
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA
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12
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Haas KL, Franz KJ. Application of metal coordination chemistry to explore and manipulate cell biology. Chem Rev 2009; 109:4921-60. [PMID: 19715312 PMCID: PMC2761982 DOI: 10.1021/cr900134a] [Citation(s) in RCA: 597] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Kathryn L Haas
- Department of Chemistry, Duke University, 124 Science Drive, Durham, North Carolina 27708-0346, USA
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13
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Rose MJ, Mascharak PK. Photosensitization of Ruthenium Nitrosyls to Red Light with an Isoelectronic Series of Heavy-Atom Chromophores: Experimental and Density Functional Theory Studies on the Effects of O-, S- and Se-Substituted Coordinated Dyes. Inorg Chem 2009; 48:6904-17. [DOI: 10.1021/ic900899j] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Michael J. Rose
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064
| | - Pradip K. Mascharak
- Department of Chemistry and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064
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14
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Halpenny GM, Mascharak PK. Accelerated Photorelease of NO from {Ru-NO}6 Nitrosyls Containing Carboxamido-N and Carboxylato-O Donors: Syntheses, Structures, and Photochemistry. Inorg Chem 2009; 48:1490-7. [DOI: 10.1021/ic801748t] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Genevieve M. Halpenny
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064
| | - Pradip K. Mascharak
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064
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15
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Liu CG, Su ZM, Guan W, Yan LK. Quantum Chemical Studies on High-Valent Metal Nitrido Derivatives of Keggin-Type Polyoxometalates ([PW11O39{MVIN}]4− (M = Ru, Os, Re)): MVI−N Bonding and Electronic Structures. Inorg Chem 2008; 48:541-8. [DOI: 10.1021/ic8012443] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Chun-Guang Liu
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
| | - Zhong-Min Su
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
| | - Wei Guan
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
| | - Li-Kai Yan
- Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
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16
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Rose MJ, Fry NL, Marlow R, Hinck L, Mascharak PK. Sensitization of ruthenium nitrosyls to visible light via direct coordination of the dye resorufin: trackable NO donors for light-triggered NO delivery to cellular targets. J Am Chem Soc 2008; 130:8834-46. [PMID: 18597437 DOI: 10.1021/ja801823f] [Citation(s) in RCA: 148] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Three nitrosyl-dye conjugates, namely, [(Me 2bpb)Ru(NO)(Resf)] ( 1-Resf), [(Me 2bQb)Ru(NO)(Resf)] ( 2-Resf), and [((OMe) 2bQb)Ru(NO)(Resf)] ( 3-Resf) have been synthesized via direct replacement of the chloride ligand of the parent {Ru-NO} (6) nitrosyls of the type [(R 2byb)Ru(NO)(L)] with the anionic tricyclic dye resorufin (Resf). The structures of 1-Resf- 3-Resf have been determined by X-ray crystallography. The dye is coordinated to the ruthenium centers of these conjugates via the phenolato-O atom and is trans to NO. Systematic red shift of the d pi(Ru) --> pi*(NO) transition of the parent nitrosyls [(R 2byb)Ru(NO)(L)] due to changes in R and y in the equatorial tetradentate ligand R 2byb (2-) results in its eventual merge with the intense absorption band of the dye around 500 nm in 3-Resf. Unlike the UV-sensitive parent [(R 2byb)Ru(NO)(L)] nitrosyls, these dye-sensitized nitrosyls rapidly release NO when exposed to visible light (lambda >/= 465 nm). Comparison of the photochemical parameters reveals that direct coordination of the light-harvesting chromophore to the ruthenium center in the present nitrosyls results in a significantly greater extent of sensitization to visible light compared to nitrosyls with appended chromophore (linked via alkyl chains). 1-Resf has been employed as a "trackable" NO donor to promote NO-induced apoptosis in MDA-MB-231 human breast cancer cells under the control of light. The results of this work demonstrate that (a) the d pi(Ru) --> pi*(NO) transition (photoband) of {Ru-NO} (6) nitrosyls can be tuned into visible range via careful alteration of the ligand frame(s) and (b) such nitrosyls can be significantly sensitized to visible light by directly ligating a light-harvesting chromophore to the ruthenium center. The potential of these photosensitive nitrosyl-dye conjugates as (i) biological tools to study the effects of NO in cellular environments and (ii) "trackable" NO donors in photodynamic therapy of malignancies (such as skin cancer) has been discussed.
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Affiliation(s)
- Michael J Rose
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA.
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17
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Eroy-Reveles AA, Leung Y, Beavers CM, Olmstead MM, Mascharak PK. Near-Infrared Light Activated Release of Nitric Oxide from Designed Photoactive Manganese Nitrosyls: Strategy, Design, and Potential as NO Donors. J Am Chem Soc 2008; 130:4447-58. [DOI: 10.1021/ja710265j] [Citation(s) in RCA: 130] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Aura A. Eroy-Reveles
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, and the Department of Chemistry, University of California, Davis, California, California 95616
| | - Yvonne Leung
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, and the Department of Chemistry, University of California, Davis, California, California 95616
| | - Christine M. Beavers
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, and the Department of Chemistry, University of California, Davis, California, California 95616
| | - Marilyn M. Olmstead
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, and the Department of Chemistry, University of California, Davis, California, California 95616
| | - Pradip K. Mascharak
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, and the Department of Chemistry, University of California, Davis, California, California 95616
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18
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Hopmann KH, Himo F. Theoretical Investigation of the Second-Shell Mechanism of Nitrile Hydratase. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200701137] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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19
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Electronic structure of dinuclear iron nitrosyl complexes with different ligands at two iron centers. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.03.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Roncaroli F, Videla M, Slep LD, Olabe JA. New features in the redox coordination chemistry of metal nitrosyls {M–NO+; M–NO; M–NO−(HNO)}. Coord Chem Rev 2007. [DOI: 10.1016/j.ccr.2007.04.012] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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21
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Dey A, Jeffrey SP, Darensbourg M, Hodgson KO, Hedman B, Solomon EI. Sulfur K-edge XAS and DFT studies on NiII complexes with oxidized thiolate ligands: implications for the roles of oxidized thiolates in the active sites of Fe and Co nitrile hydratase. Inorg Chem 2007; 46:4989-96. [PMID: 17500514 PMCID: PMC2565589 DOI: 10.1021/ic070244l] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
S K-edge X-ray absorption spectroscopy data on a series of NiII complexes with thiolate (RS-) and oxidized thiolate (RSO2-) ligands are used to quantify Ni-S bond covalency and its change upon ligand oxidation. Analyses of these results using geometry-optimized density functional theory (DFT) calculations suggest that the Ni-S sigma bonds do not weaken on ligand oxidation. Molecular orbital analysis indicates that these oxidized thiolate ligands use filled high-lying S-O pi* orbitals for strong sigma donation. However, the RSO2- ligands are poor pi donors, as the orbital required for pi interaction is used in the S-O sigma-bond formation. The oxidation of the thiolate reduces the repulsion between electrons in the filled Ni t2 orbital and the thiolate out-of-plane pi-donor orbital leading to shorter Ni-S bond length relative to that of the thiolate donor. The insights obtained from these results are relevant to the active sites of Fe- and Co-type nitrile hydratases (Nhase) that also have oxidized thiolate ligands. DFT calculations on models of the active site indicate that whereas the oxidation of these thiolates has a major effect in the axial ligand-binding affinity of the Fe-type Nhase (where there is both sigma and pi donation from the S ligands), it has only a limited effect on the sixth-ligand-binding affinity of the Co-type Nhases (where there is only sigma donation). These oxidized residues may also play a role in substrate binding and proton shuttling at the active site.
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Affiliation(s)
- Abhishek Dey
- Department of Chemistry, Stanford University, Stanford, CA, 94305
| | - Stephen P. Jeffrey
- Department of Chemistry, Texas A&M University, College Station, TX, 77843
| | | | - Keith O. Hodgson
- Department of Chemistry, Stanford University, Stanford, CA, 94305
- Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Menlo Park, California 94025
| | - Britt Hedman
- Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Menlo Park, California 94025
| | - Edward I. Solomon
- Department of Chemistry, Stanford University, Stanford, CA, 94305
- Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Menlo Park, California 94025
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Madhani M, Patra AK, Miller TW, Eroy-Reveles AA, Hobbs AJ, Fukuto JM, Mascharak PK. Biological activity of designed photolabile metal nitrosyls: light-dependent activation of soluble guanylate cyclase and vasorelaxant properties in rat aorta. J Med Chem 2007; 49:7325-30. [PMID: 17149862 DOI: 10.1021/jm0604629] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The biological and pharmacological utility of nitric oxide (NO) has led to the development of many classes of NO-donor compounds as both research tools and therapeutic agents. Many donors currently in use rely on thermal decomposition or bioactivation for the release of NO. We have developed several photolabile metal-nitrosyl donors that release NO when exposed to either visible or UV light. Herein, we show that these donors are capable of activating the primary "NO receptor", soluble guanylate cyclase (sGC), in a light-dependent fashion leading to increases in cGMP. Moreover, we demonstrate that these donors are capable of eliciting light-dependent increases of cGMP in smooth muscle cells and vasorelaxation of rat aortic smooth muscle tissue, all effects that are attributed to activation of sGC. The potential utility of these compounds as drugs and/or research tools is discussed.
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MESH Headings
- Animals
- Aorta/drug effects
- Aorta/physiology
- Cells, Cultured
- Cyclic GMP/biosynthesis
- Enzyme Activation
- Guanylate Cyclase/chemistry
- Guanylate Cyclase/isolation & purification
- In Vitro Techniques
- Iron
- Light
- Manganese
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Nitric Oxide Donors/chemical synthesis
- Nitric Oxide Donors/pharmacology
- Nitric Oxide Donors/radiation effects
- Organometallic Compounds/chemical synthesis
- Organometallic Compounds/pharmacology
- Organometallic Compounds/radiation effects
- Rats
- Receptors, Cytoplasmic and Nuclear/chemistry
- Receptors, Cytoplasmic and Nuclear/isolation & purification
- Ruthenium
- Soluble Guanylyl Cyclase
- Structure-Activity Relationship
- Vasodilation/drug effects
- Vasodilator Agents/chemical synthesis
- Vasodilator Agents/pharmacology
- Vasodilator Agents/radiation effects
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Affiliation(s)
- Melanie Madhani
- Wolfson Institute for Biomedical Research, University College London, Cruciform Building, Gower Street, London WC1E 6AE, United Kingdom
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Neese F, Petrenko T, Ganyushin D, Olbrich G. Advanced aspects of ab initio theoretical optical spectroscopy of transition metal complexes: Multiplets, spin-orbit coupling and resonance Raman intensities. Coord Chem Rev 2007. [DOI: 10.1016/j.ccr.2006.05.019] [Citation(s) in RCA: 253] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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24
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Eroy-Reveles AA, Hoffman-Luca CG, Mascharak PK. Formation of a triply bridged µ-oxo diiron(iii) core stabilized by two deprotonated carboxamide groups upon photorelease of NO from a {Fe–NO}6 iron nitrosyl. Dalton Trans 2007:5268-74. [DOI: 10.1039/b710076k] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Greene SN, Richards NGJ. Electronic structure, bonding, spectroscopy and energetics of Fe-dependent nitrile hydratase active-site models. Inorg Chem 2006; 45:17-36. [PMID: 16390037 DOI: 10.1021/ic050965p] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fe-type nitrile hydratase (NHase) is a non-heme Fe(III)-dependent enzyme that catalyzes the hydration of nitriles to the corresponding amides. Despite experimental studies of the enzyme and model Fe(III)-containing complexes, many questions concerning the electronic structure and spectroscopic transitions of the metal center remain unanswered. In addition, the catalytic mechanism of nitrile hydration has not yet been determined. We now report density functional theory (B3LYP/6-31G) calculations on three models of the Fe(III) center in the active site of NHase corresponding to hypothetical intermediates in the enzyme-catalyzed hydration of acetonitrile. Together with natural bond orbital (NBO) analysis of the chemical bonding in these active-site models and INDO/S CIS calculations of their electronic spectra, this theoretical investigation gives new insight into the molecular origin of the unusual low-spin preference and spectroscopic properties of the Fe(III) center. In addition, the low-energy electronic transition observed for the active form of NHase is assigned to a dd transition that is coupled with charge-transfer transitions involving the metal and its sulfur ligands. Calculations of isodesmic ligand-exchange reaction energies provide support for coordination of the Fe(III) center in free NHase by a water molecule rather than a hydroxide ion and suggest that the activation of the nitrile substrate by binding to the metal in the sixth coordination site during catalytic turnover cannot yet be definitively ruled out.
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Affiliation(s)
- Shannon N Greene
- Department of Chemistry, University of Florida, Gainesville, 32611-7200, USA
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Noodleman L, Han WG. Structure, redox, pK a, spin. A golden tetrad for understanding metalloenzyme energetics and reaction pathways. J Biol Inorg Chem 2006; 11:674-94. [PMID: 16830148 DOI: 10.1007/s00775-006-0136-3] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Accepted: 06/14/2006] [Indexed: 10/24/2022]
Abstract
After a review of the current status of density functional theory (DFT) for spin-polarized and spin-coupled systems, we focus on the resting states and intermediates of redox-active metalloenzymes and electron transfer proteins, showing how comparisons of DFT-calculated spectroscopic parameters with experiment and evaluation of related energies and geometries provide important information. The topics we examine include (1) models for the active-site structure of methane monooxygenase intermediate Q and ribonucleotide reductase intermediate X; (2) the coupling of electron transfer to proton transfer in manganese superoxide dismutase, with implications for reaction kinetics; (3) redox, pK(a), and electronic structure issues in the Rieske iron-sulfur protein, including their connection to coupled electron/proton transfer, and an analysis of how partial electron delocalization strongly alters the electron paramagnetic resonance spectrum; (4) the connection between protein-induced structural distortion and the electronic structure of oxidized high-potential 4Fe4S proteins with implications for cluster reactivity; (5) an analysis of cluster assembly and central-atom insertion into the FeMo cofactor center of nitrogenase based on DFT structural and redox potential calculations.
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Affiliation(s)
- Louis Noodleman
- Department of Molecular Biology, TPC15, The Scripps Research Institute, La Jolla, CA 92037, USA.
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Chmura A, Szaciłowski K, Waksmundzka-Góra A, Stasicka Z. Photochemistry of the [Fe4(μ3-S)3(NO)7]− complex in the presence of S-nucleophiles: A spectroscopic study. Nitric Oxide 2006; 14:247-60. [PMID: 16337819 DOI: 10.1016/j.niox.2005.10.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2005] [Revised: 09/28/2005] [Accepted: 10/18/2005] [Indexed: 11/28/2022]
Abstract
Biological systems usually contain cysteine, glutathione or other sulfur-containing biomolecules. These S-nucleophiles were found to affect drastically the [Fe(4)(mu(3)-S)(3)(NO)(7)](-) photolysis pathway generating products completely different from that of the neat cluster, which produces Fe(II) and NO and S(2-). The effect is interpreted in terms of formation of a pseudo-cubane adduct, [Fe(4)(mu(3)-S)(3)(mu(3)-SR)(NO)(7)](2-), whose existence in equilibrium with the parent complex has no detectable influence on the spectral properties, whereas shifts the redox potential and induces photoconversion leading to the Fe(III) species and N(2)O. Characteristic bond lengths, bond angles and atomic Mulliken charges were calculated using semi-empirical quantum chemical methods for the RBS anion and a series of pseudo-cubane complexes with S-donor or N-donor ligands. The results justify the hypothesis of the adduct formation and show that only in case of S-ligands the higher contribution of the Fe(III)-NO(-) components in adduct than in RBS is observed, which on excitation can undergo heterolytic cleavage yielding Fe(III) and NO(-), converted rapidly into N(2)O. These results are crucial in understanding the physiological activity of RBS. Fe(III) formation can be detected only when the S-ligand enables formation of a stable Fe(III) compound; the effect was recorded in the presence of sulfide, thioglycolate, 2-mercaptopropionate, mercaptosuccinate, penicillamine, 2,3-dimercaptosuccinate, 2,3-dimercaptopropanol, and thiocyanate. For all these S-ligands the Fe(III) photoproducts were identified and characterised. In the case of other thiolates, their excess results in fast reduction of Fe(III) to Fe(II), whereas N(2)O can be still detected. Quantum yields of Fe(III) formation in the presence of the S-ligands are considerably higher than that of the Fe(II) photoproduction from neat [Fe(4)(mu(3)-S)(3)(NO)(7)](-).
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Affiliation(s)
- Antonina Chmura
- Jagiellonian University, Faculty of Chemistry, Ingardena 3, 30-060 Kraków, Poland
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Dey A, Chow M, Taniguchi K, Lugo-Mas P, Davin S, Maeda M, Kovacs JA, Odaka M, Hodgson KO, Hedman B, Solomon EI. Sulfur K-edge XAS and DFT calculations on nitrile hydratase: geometric and electronic structure of the non-heme iron active site. J Am Chem Soc 2006; 128:533-41. [PMID: 16402841 PMCID: PMC4485618 DOI: 10.1021/ja0549695] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The geometric and electronic structure of the active site of the non-heme iron enzyme nitrile hydratase (NHase) is studied using sulfur K-edge XAS and DFT calculations. Using thiolate (RS(-))-, sulfenate (RSO(-))-, and sulfinate (RSO(2)(-))-ligated model complexes to provide benchmark spectral parameters, the results show that the S K-edge XAS is sensitive to the oxidation state of S-containing ligands and that the spectrum of the RSO(-) species changes upon protonation as the S-O bond is elongated (by approximately 0.1 A). These signature features are used to identify the three cysteine residues coordinated to the low-spin Fe(III) in the active site of NHase as CysS(-), CysSOH, and CysSO(2)(-) both in the NO-bound inactive form and in the photolyzed active form. These results are correlated to geometry-optimized DFT calculations. The pre-edge region of the X-ray absorption spectrum is sensitive to the Z(eff) of the Fe and reveals that the Fe in [FeNO](6) NHase species has a Z(eff) very similar to that of its photolyzed Fe(III) counterpart. DFT calculations reveal that this results from the strong pi back-bonding into the pi antibonding orbital of NO, which shifts significant charge from the formally t(2)(6) low-spin metal to the coordinated NO.
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Affiliation(s)
- Abhishek Dey
- Department of Chemistry, Stanford University, Stanford, California 94305
| | - Marina Chow
- Department of Chemistry, Stanford University, Stanford, California 94305
| | | | - Priscilla Lugo-Mas
- Department of Chemistry, University of Washington, Seattle, Washington 98195
| | - Steven Davin
- Department of Chemistry, University of Washington, Seattle, Washington 98195
| | - Mizuo Maeda
- Bioengineering Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - Julie A. Kovacs
- Department of Chemistry, University of Washington, Seattle, Washington 98195
| | - Masafumi Odaka
- Bioengineering Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - Keith O. Hodgson
- Department of Chemistry, Stanford University, Stanford, California 94305
- Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Stanford, California 94309
| | - Britt Hedman
- Stanford Synchrotron Radiation Laboratory, SLAC, Stanford University, Stanford, California 94309
| | - Edward I. Solomon
- Department of Chemistry, Stanford University, Stanford, California 94305
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29
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Interplay between iron complexes, nitric oxide and sulfur ligands: Structure, (photo)reactivity and biological importance. Coord Chem Rev 2005. [DOI: 10.1016/j.ccr.2005.03.021] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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