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Batabyal M, Upadhyay A, Kadu R, Birudukota NC, Chopra D, Kumar S. Tetravalent Spiroselenurane Catalysts: Intramolecular Se···N Chalcogen Bond-Driven Catalytic Disproportionation of H 2O 2 to H 2O and O 2 and Activation of I 2 and NBS. Inorg Chem 2022; 61:8729-8745. [PMID: 35638247 DOI: 10.1021/acs.inorgchem.2c00651] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chalcogen-bonding interactions have recently gained considerable attention in the field of synthetic chemistry, structure, and bonding. Here, three organo-spiroselenuranes, having a Se(IV) center with a strong intramolecular Se···N chalcogen-bonded interaction, have been isolated by the oxidation of the respective bis(2-benzamide) selenides derived from an 8-aminoquinoline ligand. Further, the synthesized spiroselenuranes, when assayed for their antioxidant activity, show disproportionation of hydrogen peroxide into H2O and O2 with first-order kinetics with respect to H2O2 for the first time by any organoselenium molecules as monitored by 1H NMR spectroscopy. Electron-donating 5-methylthio-benzamide ring-substituted spiroselenurane disproportionates hydrogen peroxide at a high rate of 15.6 ± 0.4 × 103 μM min-1 with a rate constant of 8.57 ± 0.50 × 10-3 s-1, whereas 5-methoxy and unsubstituted-benzamide spiroselenuranes catalyzed the disproportionation of H2O2 at rates of 7.9 ± 0.3 × 103 and 2.9 ± 0.3 × 103 μM min-1 with rate constants of 1.16 ± 0.02 × 10-3 and 0.325 ± 0.025 × 10-3 s-1, respectively. The evolved oxygen gas from the spiroselenurane-catalyzed disproportion of H2O2 has also been confirmed by a gas chromatograph-thermal conductivity detector (GCTCD) and a portable digital polarographic dissolved O2 probe. Additionally, the synthesized spiroselenuranes exhibit thiol peroxidase antioxidant activities for the reduction of H2O2 by a benzenethiol co-reductant monitored by UV-visible spectroscopy. Next, the Se···N bonded spiroselenuranes have been explored as catalysts in synthetic oxidation iodolactonization and bromination of arenes. The synthesized spiroselenurane has activated I2 toward the iodolactonization of alkenoic acids under base-free conditions. Similarly, efficient chemo- and regioselective monobromination of various arenes with NBS catalyzed by chalcogen-bonded synthesized spiroselenuranes has been achieved. Mechanistic insight into the spiroselenuranes in oxidation reactions has been gained by 77Se NMR, mass spectrometry, UV-visible spectroscopy, single-crystal X-ray structure, and theoretical (DFT, NBO, and AIM) studies. It seems that the highly electrophilic nature of the selenium center is attributed to the presence of an intramolecular Se···N interaction and a vacant coordination site in spiroselenuranes is crucial for the activation of H2O2, I2, and NBS. The reaction of H2O2, I2, and NBS with tetravalent spiroselenurane would lead to an octahedral-Se(VI) intermediate, which is reduced back to Se(IV) due to thermodynamic instability of selenium in its highest oxidation state and the presence of a strong intramolecular N-donor atom.
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Affiliation(s)
- Monojit Batabyal
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India
| | - Aditya Upadhyay
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India
| | - Rahul Kadu
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India.,MIT School of Engineering, MIT Art, Design and Technology University Pune, Loni Kalbhor, Maharashtra 412201, India
| | - Nihal Chaitanya Birudukota
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India
| | - Deepak Chopra
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri Bhopal 462 066, Madhya Pradesh, India
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Banerjee K, Bhattacherjee D, Mahato SK, Sufian A, Bhabak KP. Benzimidazole- and Imidazole-Fused Selenazolium and Selenazinium Selenocyanates: Ionic Organoselenium Compounds with Efficient Peroxide Scavenging Activities. Inorg Chem 2021; 60:12984-12999. [PMID: 34369772 DOI: 10.1021/acs.inorgchem.1c01410] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Three new classes of ionic organoselenium compounds containing cationic benzimidazolium and imidazolium ring systems with selenocyanates as counterions are described. The cyclization of N,N'-disubstituted benzimidazolium and imidazolium bromides having N-(CH2)2-Br and N-(CH2)3-Br groups in the presence of potassium selenocyanate (KSeCN) led to formation of the corresponding selenazolium selenocyanates (21a, 21b, 22a, and 22b) and selenazinium selenocyanates (21c, 21d, 22c, and 22d). However, the open-chain selenocyanates with additional selenocyanate counterions (21e, 21f, 22e, and 22f) were formed from the N,N'-disubstituted benzimidazolium and imidazolium bromides having N-(CH2)6-Br groups. Mechanistic studies were carried out to understand the feasibility of such cyclization processes in the presence of KSeCN. The compounds were studied further for their potencies to catalytically reduce H2O2 in the presence of thiols. Interestingly, the cyclic selenazolium (21a, 21b, 22a, and 22b) and selenazinium compounds (21c, 21d, 22c, and 22d) exhibited significantly higher antioxidant activities than the corresponding acyclic selenocyanates (21f, 22e, and 22f). Selected compounds (22d and 22e) were further evaluated for their potencies in modulating the intracellular level of reactive oxygen species (ROS) in a representative macrophage cell line (RAW 264.7). Owing to the cationic nature of compounds, they may target and scavenge mitochondrial ROS in the cellular medium.
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Affiliation(s)
- Kaustav Banerjee
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India
| | - Debojit Bhattacherjee
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India.,Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India
| | - Sulendar K Mahato
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India
| | - Abu Sufian
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India
| | - Krishna Pada Bhabak
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India.,Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati, 781039 Assam, India
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Liu M, Gao L, Zhao L, He J, Yuan Q, Zhang P, Zhao Y, Gao X. Peptide-Au Clusters Induced Tumor Cells Apoptosis via Targeting Glutathione Peroxidase-1: The Molecular Dynamics Assisted Experimental Studies. Sci Rep 2017; 7:131. [PMID: 28273930 PMCID: PMC5428013 DOI: 10.1038/s41598-017-00278-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 02/15/2017] [Indexed: 12/21/2022] Open
Abstract
The original motivation of the article is to give a systematic investigation on the protocol of combining computer simulation and accurate synthesis of serial peptide protected gold clusters for potent tumor targeting therapy. Glutathione peroxidase-1 (GPx-1) is a crucial antioxidant selenoenzyme that regulates cellular redox level, thus becomes a potential target in cancer treatment. We firstly utilize molecular dynamic (MD) simulation to rationally design and screen serial peptide-Au cluster compounds with special peptide sequences and precise gold atoms, which can recognize and bind specific domain of GPx-1 with high affinity. The theoretical simulations were further verified by the following peptide-Au clusters synthesis and GPx-1 activity suppression studies in buffer and cells, respectively. Further cytological experiments corroborated that peptide-Au clusters are promising nanoparticles inducing tumor cells apoptosis by suppressing GPx-1 activity and increasing higher cellular reactive oxygen species level to initiate tumor cell apoptosis through intrinsic mitochondrial pathway.
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Affiliation(s)
- Meiqing Liu
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Liang Gao
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
| | - Lina Zhao
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
| | - Jian He
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Qing Yuan
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Peng Zhang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Yawei Zhao
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Xueyun Gao
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
- Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing, 100124, China.
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Kole GK, Wadawale AP, Nigam S, Majumder C, Jain VK. Intermolecular Aurophilic versus Intramolecular Au⋅⋅⋅N Secondary Interactions in Two-Coordinate Gold(I) Selenolate Complexes. ChemistrySelect 2016. [DOI: 10.1002/slct.201601122] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Goutam Kumar Kole
- Chemistry Division; Bhabha Atomic Research Centre; Mumbai 400085 India
| | - Amey P. Wadawale
- Chemistry Division; Bhabha Atomic Research Centre; Mumbai 400085 India
| | - Sandeep Nigam
- Chemistry Division; Bhabha Atomic Research Centre; Mumbai 400085 India
| | | | - Vimal K. Jain
- Chemistry Division; Bhabha Atomic Research Centre; Mumbai 400085 India
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Bhabak KP, Bhowmick D. Synthetic strategies of gold(I)-selenolates from ortho-substituted diaryl diselenides via selenol and selenenyl sulfide intermediates. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.06.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Karabulut S, Leszczynski J. Molecular structure of aurothioglucose: a comprehensive computational study. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Zou T, Lum CT, Lok CN, Zhang JJ, Che CM. Chemical biology of anticancer gold(iii) and gold(i) complexes. Chem Soc Rev 2015; 44:8786-801. [DOI: 10.1039/c5cs00132c] [Citation(s) in RCA: 420] [Impact Index Per Article: 46.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Anticancer gold complexes, including their mechanisms of action and the approaches adopted to improve the anticancer efficiency are described.
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Affiliation(s)
- Taotao Zou
- State Key Laboratory of Synthetic Chemistry
- Institute of Molecular Functional Materials
- Chemical Biology Centre and Department of Chemistry
- The University of Hong Kong
- Hong Kong
| | - Ching Tung Lum
- State Key Laboratory of Synthetic Chemistry
- Institute of Molecular Functional Materials
- Chemical Biology Centre and Department of Chemistry
- The University of Hong Kong
- Hong Kong
| | - Chun-Nam Lok
- State Key Laboratory of Synthetic Chemistry
- Institute of Molecular Functional Materials
- Chemical Biology Centre and Department of Chemistry
- The University of Hong Kong
- Hong Kong
| | - Jing-Jing Zhang
- State Key Laboratory of Synthetic Chemistry
- Institute of Molecular Functional Materials
- Chemical Biology Centre and Department of Chemistry
- The University of Hong Kong
- Hong Kong
| | - Chi-Ming Che
- State Key Laboratory of Synthetic Chemistry
- Institute of Molecular Functional Materials
- Chemical Biology Centre and Department of Chemistry
- The University of Hong Kong
- Hong Kong
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9
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Sharma RK, Wadawale A, Kedarnath G, Manna D, Ghanty TK, Vishwanadh B, Jain VK. Synthesis, structures and DFT calculations of 2-(4,6-dimethyl pyrimidyl)selenolate complexes of Cu(i), Ag(i) and Au(i) and their conversion into metal selenide nanocrystals. Dalton Trans 2014; 43:6525-35. [DOI: 10.1039/c4dt00012a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Dimethyl pyrimidylselenolates of Cu(i), Ag(i) and Au(i) were synthesized and utilized as precursors for preparation of the respective metal selenide nanocrystals.
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Affiliation(s)
- Rakesh K. Sharma
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085, India
| | - Amey Wadawale
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085, India
| | - G. Kedarnath
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085, India
| | - Debashree Manna
- Theoretical Chemistry Section
- Bhabha Atomic Research Centre
- Mumbai 400 085, India
| | - Tapan K. Ghanty
- Theoretical Chemistry Section
- Bhabha Atomic Research Centre
- Mumbai 400 085, India
| | - B. Vishwanadh
- Materials Science Division
- Bhabha Atomic Research Centre
- Mumbai 400 085, India
| | - Vimal K. Jain
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085, India
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10
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Synthesis, properties, and antitumor effects of a new mixed phosphine gold(I) compound in human colon cancer cells. J Inorg Biochem 2013; 124:78-87. [DOI: 10.1016/j.jinorgbio.2013.03.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Revised: 03/24/2013] [Accepted: 03/25/2013] [Indexed: 11/23/2022]
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11
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Di Sarra F, Fresch B, Bini R, Saielli G, Bagno A. Reactivity of Auranofin with Selenols and Thiols - Implications for the Anticancer Activity of Gold(I) Compounds. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300058] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Wang Y, Liu M, Cao R, Zhang W, Yin M, Xiao X, Liu Q, Huang N. A Soluble Bis-Chelated Gold(I) Diphosphine Compound with Strong Anticancer Activity and Low Toxicity. J Med Chem 2013; 56:1455-66. [DOI: 10.1021/jm3009822] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yanli Wang
- National Institute of Biological Sciences, Beijing, 7 Science Park Road,
Zhongguancun Life Science Park, Beijing 102206, China
| | - Minyu Liu
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dong Chuan Road,
Shanghai 200240, China
- Department of Pharmacology, Shanghai Institute of Pharmaceutical Industry, 1111
Zhong Shan Bei Yi Road, Shanghai 200437, China
| | - Ran Cao
- National Institute of Biological Sciences, Beijing, 7 Science Park Road,
Zhongguancun Life Science Park, Beijing 102206, China
| | - Wanbin Zhang
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dong Chuan Road,
Shanghai 200240, China
| | - Ming Yin
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dong Chuan Road,
Shanghai 200240, China
| | - Xuhua Xiao
- Department of Pharmacology, Shanghai Institute of Pharmaceutical Industry, 1111
Zhong Shan Bei Yi Road, Shanghai 200437, China
| | - Quanhai Liu
- Department of Pharmacology, Shanghai Institute of Pharmaceutical Industry, 1111
Zhong Shan Bei Yi Road, Shanghai 200437, China
| | - Niu Huang
- National Institute of Biological Sciences, Beijing, 7 Science Park Road,
Zhongguancun Life Science Park, Beijing 102206, China
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Scheetz KJ, Spaeth AD, Vorushilov AS, Powell DR, Day VW, Barybin MV. The 2,6-dimercaptoazulene motif: efficient synthesis and completely regioselective metallation of its 6-mercapto terminus. Chem Sci 2013. [DOI: 10.1039/c3sc51773j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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Bhowmick D, Mugesh G. Tertiary amine-based glutathione peroxidase mimics: some insights into the role of steric and electronic effects on antioxidant activity. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.09.020] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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15
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Foley JB, Herring A, Li B, Dikarev EV. Photochemical reactivity of two gold(I) dinuclear complexes, cis/trans-(AupNBT)2dppee: Isomerization for the cis-(AupNBT)2dppee isomer, radical substitution for trans-(AupNBT)2dppee. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2012.03.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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16
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BHABAK KRISHNAP, MUGESH GOVINDASAMY. Gold(I)-selenolate complexes: Synthesis, characterization and ligand exchange reactions. J CHEM SCI 2011. [DOI: 10.1007/s12039-011-0166-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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17
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Asatkar A, Nair S, Verma V, Verma C, Jain T, Singh R, Gupta S, Butcher R. Syntheses of phenoxo-bridged Zn(II) and metallamacrocyclic Hg(II) complexes of organochalcogen (Se, Te) substituted Schiff-bases: structure and DNA-binding studies of Zn(II) complexes. J COORD CHEM 2011. [DOI: 10.1080/00958972.2011.639874] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- A.K. Asatkar
- a Department of Chemistry , Disha Institute of Management and Technology , Raipur 492101 , Chhattisgarh , India
| | - S. Nair
- a Department of Chemistry , Disha Institute of Management and Technology , Raipur 492101 , Chhattisgarh , India
| | - V.K. Verma
- a Department of Chemistry , Disha Institute of Management and Technology , Raipur 492101 , Chhattisgarh , India
| | - C.S. Verma
- a Department of Chemistry , Disha Institute of Management and Technology , Raipur 492101 , Chhattisgarh , India
| | - T.A. Jain
- a Department of Chemistry , Disha Institute of Management and Technology , Raipur 492101 , Chhattisgarh , India
| | - R. Singh
- b ER&IPR, Defence Research and Development Organization , New Delhi 110105 , India
| | - S.K. Gupta
- c School of Studies in Chemistry, Jiwaji University , Gwalior 474011 , India
| | - R.J. Butcher
- d Department of Inorganic and Structural Chemistry , Howard University , Washington , DC 20059 , USA
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Satheeshkumar K, Mugesh G. Synthesis and Antioxidant Activity of Peptide-Based Ebselen Analogues. Chemistry 2011; 17:4849-57. [DOI: 10.1002/chem.201003417] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2011] [Indexed: 11/06/2022]
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Affiliation(s)
- Adriana Ilie
- a Department of Inorganic Chemistry , Babes-Bolyai University , Cluj-Napoca , Romania
- b Department of Chemistry , Ludwig-Maximilians-University of Munich , Munich , Germany
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Tamilselvi A, Mugesh G. Metallo-β-lactamase-Catalyzed Hydrolysis of Cephalosporins: Some Mechanistic Insights into the Effect of Heterocyclic Thiones on Enzyme Activity. Inorg Chem 2011; 50:749-56. [DOI: 10.1021/ic100253k] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- A. Tamilselvi
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Govindasamy Mugesh
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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Bhabak KP, Bhuyan BJ, Mugesh G. Bioinorganic and medicinal chemistry: aspects of gold(i)-protein complexes. Dalton Trans 2011; 40:2099-111. [DOI: 10.1039/c0dt01057j] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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22
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Hill DT, Isab AA, Griswold DE, DiMartino MJ, Matz ED, Figueroa AL, Wawro JE, DeBrosse C, Reiff WM, Elder RC, Jones B, Webb JW, Shaw CF. Seleno-auranofin (Et3PAuSe-tagl): synthesis, spectroscopic (EXAFS, 197Au Mössbauer, 31P, 1H, 13C, and 77Se NMR, ESI-MS) characterization, biological activity, and rapid serum albumin-induced triethylphosphine oxide generation. Inorg Chem 2010; 49:7663-75. [PMID: 20704360 DOI: 10.1021/ic902335z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Seleno-auranofin (SeAF), an analogue of auranofin (AF), the orally active antiarthritic gold drug in clinical use, was synthesized and has been characterized by an array of physical techniques and biological assays. The Mössbauer and extended X-ray absorption fine structure (EXAFS) parameters of the solid compound demonstrate a linear P-Au-Se coordination environment at a gold(I) center, analogous to the structure of auranofin. The (31)P, (13)C, and (1)H NMR spectra of SeAF in chloroform solution closely resemble those of auranofin. The (77)Se spectrum consists of a singlet at 481 ppm, consistent with a metal-bound selenolate ligand. The absence of (2)J(PSe) coupling in the (31)P and (77)Se spectra may arise from dynamic processes occurring in solution or because the (2)J(PSe) coupling constants are smaller than the observed bandwidths. Electrospray ionization mass spectrometry (ESI-MS) spectra of SeAF in 50:50 methanol-water exhibited strong signals for [(Et(3)P)(2)Au](+), [(Et(3)PAu)(2)-mu-Se-tagl](+), and [Au(Se-tagl)(2)](-), which arise from ligand scrambling reactions. Three assays of the anti-inflammatory activity of SeAF allowed comparison to AF. SeAF exhibited comparable activity in the topically administered murine arachadonic acid-induced and phorbol ester-induced anti-inflammatory assays but was inactive in the orally administered carrageenan-induced assay in rats. However, in vivo serum gold levels were comparable in the rat, suggesting that differences between the in vivo metabolism of the two compounds, leading to differences in transport to the inflamed site, may account for the differential activity in the carrageenan-induced assay. Reactions of serum albumin, the principal transport protein of gold in the serum, demonstrated formation of AlbSAuPEt(3) at cysteine 34 and provided evidence for facile reduction of disulfide bonds at cysteine 34 and very rapid formation of Et(3)P=O, a known metabolite of auranofin.
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Affiliation(s)
- David T Hill
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, USA.
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Bhabak KP, Mugesh G. Functional mimics of glutathione peroxidase: bioinspired synthetic antioxidants. Acc Chem Res 2010; 43:1408-19. [PMID: 20690615 DOI: 10.1021/ar100059g] [Citation(s) in RCA: 368] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Oxidative stress is caused by an imbalance between the production of reactive oxygen species (ROS) and the biological system's ability to detoxify these reactive intermediates. Mammalian cells have elaborate antioxidant defense mechanisms to control the damaging effects of ROS. Glutathione peroxidase (GPx), a selenoenzyme, plays a key role in protecting the organism from oxidative damage by catalyzing the reduction of harmful hydroperoxides with thiol cofactors. The selenocysteine residue at the active site forms a "catalytic triad" with tryptophan and glutamine, which activates the selenium moiety for an efficient reduction of peroxides. After the discovery that ebselen, a synthetic organoselenium compound, mimics the catalytic activity of GPx both in vitro and in vivo, several research groups developed a number of small-molecule selenium compounds as functional mimics of GPx, either by modifying the basic structure of ebselen or by incorporating some structural features of the native enzyme. The synthetic mimics reported in the literature can be classified in three major categories: (i) cyclic selenenyl amides having a Se-N bond, (ii) diaryl diselenides, and (iii) aromatic or aliphatic monoselenides. Recent studies show that ebselen exhibits very poor GPx activity when aryl or benzylic thiols such as PhSH or BnSH are used as cosubstrates. Because the catalytic activity of each GPx mimic largely depends on the thiol cosubstrates used, the difference in the thiols causes the discrepancies observed in different studies. In this Account, we demonstrate the effect of amide and amine substituents on the GPx activity of various organoselenium compounds. The existence of strong Se···O/N interactions in the selenenyl sulfide intermediates significantly reduces the GPx activity. These interactions facilitate an attack of thiol at selenium rather than at sulfur, leading to thiol exchange reactions that hamper the formation of catalytically active selenol. Therefore, any substituent capable of enhancing the nucleophilic attack of thiol at sulfur in the selenenyl sulfide state would enhance the antioxidant potency of organoselenium compounds. Interestingly, replacement of the sec-amide substituent by a tert-amide group leads to a weakening of Se···O interactions in the selenenyl sulfide intermediates. This modification results in 10- to 20-fold enhancements in the catalytic activities. Another strategy involving the replacement of tert-amide moieties by tert-amino substituents further increases the activity by 3- to 4-fold. The most effective modification so far in benzylamine-based GPx mimics appears to be either the replacement of a tert-amino substituent by a sec-amino group or the introduction of an additional 6-methoxy group in the phenyl ring. These strategies can contribute to a remarkable enhancement in the GPx activity. In addition to enhancing catalytic activity, a change in the substituents near the selenium moiety alters the catalytic mechanisms. The mechanistic investigations of functional mimics are useful not only for understanding the complex chemistry at the active site of GPx but also for designing and synthesizing novel antioxidants and anti-inflammatory agents.
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Affiliation(s)
- Krishna P. Bhabak
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Govindasamy Mugesh
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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Mukherjee AJ, Zade SS, Singh HB, Sunoj RB. Organoselenium Chemistry: Role of Intramolecular Interactions. Chem Rev 2010; 110:4357-416. [PMID: 20384363 DOI: 10.1021/cr900352j] [Citation(s) in RCA: 390] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Anna J. Mukherjee
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India, and Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741252, Nadia, West Bengal, India
| | - Sanjio S. Zade
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India, and Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741252, Nadia, West Bengal, India
| | - Harkesh B. Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India, and Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741252, Nadia, West Bengal, India
| | - Raghavan B. Sunoj
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India, and Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741252, Nadia, West Bengal, India
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Bhabak K, Mugesh G. Synthesis and Structure-Activity Correlation Studies of Secondary- and Tertiary-Amine-Based Glutathione Peroxidase Mimics. Chemistry 2009; 15:9846-54. [DOI: 10.1002/chem.200900818] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Fonteh P, Meyer D. Novel gold(i) phosphine compounds inhibit HIV-1 enzymes. Metallomics 2009; 1:427-33. [DOI: 10.1039/b909036c] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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