1
|
Wu Y, Hu Q, Che Y, Niu Z. Opportunities and challenges for plastic depolymerization by biomimetic catalysis. Chem Sci 2024; 15:6200-6217. [PMID: 38699266 PMCID: PMC11062090 DOI: 10.1039/d4sc00070f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 03/20/2024] [Indexed: 05/05/2024] Open
Abstract
Plastic waste has imposed significant burdens on the environment. Chemical recycling allows for repeated regeneration of plastics without deterioration in quality, but often requires harsh reaction conditions, thus being environmentally unfriendly. Enzymatic catalysis offers a promising solution for recycling under mild conditions, but it faces inherent limitations such as poor stability, high cost, and narrow substrate applicability. Biomimetic catalysis may provide a new avenue by combining high enzyme-like activity with the stability of inorganic materials. Biomimetic catalysis has demonstrated great potential in biomass conversion and has recently shown promising progress in plastic degradation. This perspective discusses biomimetic catalysis for plastic degradation from two perspectives: the imitation of the active centers and the imitation of the substrate-binding clefts. Given the chemical similarity between biomass and plastics, relevant work is also included in the discussion to draw inspiration. We conclude this perspective by highlighting the challenges and opportunities in achieving sustainable plastic recycling via a biomimetic approach.
Collapse
Affiliation(s)
- Yanfen Wu
- State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University Beijing 100084 China
| | - Qikun Hu
- State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University Beijing 100084 China
| | - Yizhen Che
- State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University Beijing 100084 China
| | - Zhiqiang Niu
- State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University Beijing 100084 China
| |
Collapse
|
2
|
Trinh TK, Jian T, Jin B, Nguyen DT, Zuckermann RN, Chen CL. Designed Metal-Containing Peptoid Membranes as Enzyme Mimetics for Catalytic Organophosphate Degradation. ACS APPLIED MATERIALS & INTERFACES 2023; 15:51191-51203. [PMID: 37879106 PMCID: PMC10636725 DOI: 10.1021/acsami.3c11816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 10/10/2023] [Accepted: 10/12/2023] [Indexed: 10/27/2023]
Abstract
The detoxification of lethal organophosphate (OP) residues in the environment is crucial to prevent human exposure and protect modern society. Despite serving as excellent catalysts for OP degradation, natural enzymes require costly preparation and readily deactivate upon exposure to environmental conditions. Herein, we designed and prepared a series of phosphotriesterase mimics based on stable, self-assembled peptoid membranes to overcome these limitations of the enzymes and effectively catalyze the hydrolysis of dimethyl p-nitrophenyl phosphate (DMNP)─a nerve agent simulant. By covalently attaching metal-binding ligands to peptoid N-termini, we attained enzyme mimetics in the form of surface-functionalized crystalline nanomembranes. These nanomembranes display a precisely controlled arrangement of coordinated metal ions, which resemble the active sites found in phosphotriesterases to promote DMNP hydrolysis. Moreover, using these highly programmable peptoid nanomembranes allows for tuning the local chemical environment of the coordinated metal ion to achieve enhanced hydrolysis activity. Among the crystalline membranes that are active for DMNP degradation, those assembled from peptoids containing bis-quinoline ligands with an adjacent phenyl side chain showed the highest hydrolytic activity with a 219-fold rate acceleration over the background, demonstrating the important role of the hydrophobic environment in proximity to the active sites. Furthermore, these membranes exhibited remarkable stability and were able to retain their catalytic activity after heating to 60 °C and after multiple uses. This work provides insights into the principal features to construct a new class of biomimetic materials with high catalytic efficiency, cost-effectiveness, and reusability applied in nerve agent detoxification.
Collapse
Affiliation(s)
- Thi Kim
Hoang Trinh
- Physical
Sciences Division, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | - Tengyue Jian
- Physical
Sciences Division, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | - Biao Jin
- Physical
Sciences Division, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | - Dan-Thien Nguyen
- Physical
Sciences Division, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | - Ronald N. Zuckermann
- Molecular
Foundry, Lawrence Berkeley National
Laboratory, 1 Cyclotron Rd., Berkeley, California 94720, United States
| | - Chun-Long Chen
- Physical
Sciences Division, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
- Department
of Chemical Engineering, University of Washington, Seattle, Washington 98195, United States
| |
Collapse
|
3
|
Jayasinghe-Arachchige VM, Serafim LF, Hu Q, Ozen C, Moorkkannur SN, Schenk G, Prabhakar R. Elucidating the Roles of Distinct Chemical Factors in the Hydrolytic Activities of Hetero- and Homonuclear Synthetic Analogues of Binuclear Metalloenzymes. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
| | - Leonardo F. Serafim
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Qiaoyu Hu
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Cihan Ozen
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Sreerag N. Moorkkannur
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| | - Gerhard Schenk
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane, Queensland 4072, Australia
| | - Rajeev Prabhakar
- Department of Chemistry, University of Miami, Coral Gables, Florida 33146, United States
| |
Collapse
|
4
|
Costa LMO, Reis IS, Fernandes C, Marques MM, Resende JALC, Krenske EH, Schenk G, Gahan LR, Horn A. Synthesis, characterization and computational investigation of the phosphatase activity of a dinuclear Zinc(II) complex containing a new heptadentate asymmetric ligand. J Inorg Biochem 2023; 239:112064. [PMID: 36410306 DOI: 10.1016/j.jinorgbio.2022.112064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 10/24/2022] [Accepted: 11/01/2022] [Indexed: 11/06/2022]
Abstract
We report the synthesis of a new asymmetric heptadentate ligand based on the 1,3-diaminopropan-2-ol backbone. The ligand 3-[[3-(bis-pyridin-2-ylmethyl-amino)-2-hydroxy-propyl]-(2-carbamoyl-ethyl)-amino]-propionamide (HL1) contains two amide and two pyridine groups attached to the 1,3-diaminopropan-2-ol core. Reaction between HL1 and Zn(ClO4)2.6H2O resulted in the formation of the dinuclear [Zn2(L1)(μ-OAc)](ClO4)2 complex, characterized by single crystal X-ray diffraction, 1H, 13C and 15N NMR, ESI-(+)-MS, CHN elemental analysis as well as infrared spectroscopy. The phosphatase activity of the complex was studied in the pH range 6-11 employing pyridinium bis(2,4-dinitrophenyl)phosphate (py(BDNPP)) as substrate. The complex exhibited activity dependent on the pH, presenting an asymmetric bell shape profile with the highest activity at pH 9; at high pH ligand exchange is rate-limiting. The hydrolysis of BDNPP- at pH 9 displayed behavior characteristic of Michaelis-Menten kinetics, with kcat = 5.06 × 10-3 min-1 and Km = 5.7 ± 1.0 mM. DFT calculations map out plausible reaction pathways and identify a terminal, Zn(II)-bound hydroxide as likely nucleophile.
Collapse
Affiliation(s)
- Luel M O Costa
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ 28013-602, Brazil
| | - Iago S Reis
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Christiane Fernandes
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Marcelo M Marques
- Colégio Universitário Geraldo Reis, Universidade Federal Fluminense, Niterói, RJ 24210-200, Brazil
| | - Jackson A L C Resende
- Instituto de Ciências Exatas e da Terra, Universidade Federal de Mato Grosso, Pontal do Araguaia, MT, Brazil
| | - Elizabeth H Krenske
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Gerhard Schenk
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia; Sustainable Minerals Institute, The University of Queensland, Brisbane, Queensland, Australia, 4072; Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Lawrence R Gahan
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Adolfo Horn
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil.
| |
Collapse
|
5
|
Wilson LA, Pedroso MM, Peralta RA, Gahan LR, Schenk G. Biomimetics for purple acid phosphatases: A historical perspective. J Inorg Biochem 2023; 238:112061. [PMID: 36371912 DOI: 10.1016/j.jinorgbio.2022.112061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 10/23/2022] [Accepted: 10/29/2022] [Indexed: 11/06/2022]
Abstract
Biomimetics hold potential for varied applications in biotechnology and medicine but have also attracted particular interest as benchmarks for the functional study of their more complex biological counterparts, e.g. metalloenzymes. While many of the synthetic systems adequately mimic some structural and functional aspects of their biological counterparts the catalytic efficiencies displayed are mostly far inferior due to the smaller size and the associated lower complexity. Nonetheless they play an important role in bioinorganic chemistry. Numerous examples of biologically inspired and informed artificial catalysts have been reported, designed to mimic a plethora of chemical transformations, and relevant examples are highlighted in reviews and scientific reports. Herein, we discuss biomimetics of the metallohydrolase purple acid phosphatase (PAP), examples of which have been used to showcase synergistic research advances for both the biological and synthetic systems. In particular, we focus on the seminal contribution of our colleague Prof. Ademir Neves, and his group, pioneers in the design and optimization of suitable ligands that mimic the active site of PAP.
Collapse
Affiliation(s)
- Liam A Wilson
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Marcelo M Pedroso
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Rosely A Peralta
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Lawrence R Gahan
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Gerhard Schenk
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia; Sustainable Minerals Institute, The University of Queensland, Brisbane, Queensland 4072, Australia; Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia.
| |
Collapse
|
6
|
Luiz E, Farias G, Bortoluzzi AJ, Neves A, de Melo Mattos LM, Pereira MD, Xavier FR, Peralta RA. Hydrolytic activity of new bioinspired Mn IIIMn II and Fe IIIMn II complexes as mimetics of PAPs: Biological and environmental interest. J Inorg Biochem 2022; 236:111965. [PMID: 35988388 DOI: 10.1016/j.jinorgbio.2022.111965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 08/01/2022] [Accepted: 08/10/2022] [Indexed: 12/15/2022]
Abstract
Coordination compounds that mimic Purple Acid Phosphatases (PAPs) have drawn attention in the bioinorganic field due to their capacity to cleave phosphodiester bonds. However, their catalytic activity upon phosphate triesters is still unexplored. Thus, we report the synthesis and characterization of two binuclear complexes, [MnIIMnIII(L1)(OAc)2]BF4 (1) and [MnIIFeIII(L1)(OAc)2]BF4 (2) (H2L1 = 2-[N,N-bis-(2- pyridilmethyl)aminomethyl]-4-methyl-6-[N-(2-hydroxy-3-formyl-5-methylbenzyl)-N-(2-pyridylmethyl)aminomethyl]phenol), their hydrolytic activity and antioxidant potential. The complexes were fully characterized, including the X-Ray diffraction (XRD) of 1. Density functional theory (DFT) calculations were performed to better understand their electronic and structural properties and phosphate conjugates. The catalytic activity was analyzed for two model substrates, a diester (BDNPP) and a triester phosphate (DEDNPP). The results suggest enhancement of the hydrolysis reaction by 170 to 1500 times, depending on the substrate and complex. It was possible to accompany the catalytic reaction of DEDNPP hydrolysis by phosphorus nuclear magnetic resonance (31P NMR), showing that both 1 and 2 are efficient catalysts. Moreover, we also addressed that 1 and 2 present a relevant antioxidant potential, protecting the yeast Saccharomyces cerevisiae, used as eukaryotic model of study, against the exposure of cells to acute oxidative stress.
Collapse
Affiliation(s)
- Edinara Luiz
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil
| | - Giliandro Farias
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil
| | - Adailton J Bortoluzzi
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil
| | - Ademir Neves
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil
| | - Larissa Maura de Melo Mattos
- Instituto de Química, Departamento de Bioquímica, Universidade Federal do Rio de Janeiro, 21941-909, Brazil; Rede Micologia RJ - FAPERJ
| | - Marcos Dias Pereira
- Instituto de Química, Departamento de Bioquímica, Universidade Federal do Rio de Janeiro, 21941-909, Brazil; Rede Micologia RJ - FAPERJ
| | - Fernando R Xavier
- Departamento de Química, Universidade do Estado de Santa Catarina, Joinville, Santa Catarina 89219-710, Brazil.
| | - Rosely A Peralta
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil.
| |
Collapse
|
7
|
Durigon DC, Duarte L, Fonseca J, Tizziani T, R. S. Candela D, Braga AL, Bortoluzzi AJ, Neves A, Peralta RA. Synthesis, structure and properties of new triiron(III) complexes: Phosphodiester cleavage and antioxidant activity. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
8
|
Yue J, Chen Y, Wang X, Xu B, Xu Z, Liu X, Chen Z, Zhang K, Jiang W. Artificial phosphatase upon premicellar nanoarchitectonics of lanthanum complexes with long-chained imidazole derivatives. J Colloid Interface Sci 2022; 627:459-468. [PMID: 35868041 DOI: 10.1016/j.jcis.2022.07.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 05/17/2022] [Accepted: 07/04/2022] [Indexed: 10/17/2022]
Abstract
Four novel long chain-containing tridentate imidazole derivatives (Ln, n = 1, 2, 3, 4) were synthesized for in situ formation of mononuclear lanthanum(III) complexes as artificial phosphodiesterases. These in-situ formed La(III) complexes (named LaLn) were used to catalyze the transesterification of 2-hydroxypropyl p-nitrophenyl phosphate (HPNP), a classic RNA model. Critical aggregation concentrations (CAC) were determined for the as-prepared tridentate imidazole derivatives as ligands and corresponding mixtures of equivalent ligand and La3+ ion with a mole rate of 1:1. It denotes that the introduction of La3+ ion increases the CAC values of imidazole derivatives by about 2 to 3 folds. Foaming test shows that the foam height is positively correlated with the length of hydrophobic chain. Transesterification of HPNP mediated by LaLn nanoarchitectonics indicates that the introducing of hydrophobic chain benefits rate enhancement, showing excess three orders of magnitude acceleration under physiological conditions (pH 7.0, 25 °C). Moreover, catalytic reactivities of these La(III) complexes increased along with the increase in chain length: LaL1 < LaL2 < LaL3 < LaL4, suggesting a positive correlation to hydrophobic chain length.
Collapse
Affiliation(s)
- Jian Yue
- School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Sichuan, Zigong 643000, PR China
| | - Yu Chen
- School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Sichuan, Zigong 643000, PR China
| | - Xiuyang Wang
- School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Sichuan, Zigong 643000, PR China
| | - Bin Xu
- School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Sichuan, Zigong 643000, PR China.
| | - Zhigang Xu
- School of Pharmacy, Chongqing University of Arts and Sciences, Chongqing, Yongchuan 402160, PR China
| | - Xiaoqiang Liu
- School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Sichuan, Zigong 643000, PR China
| | - Zhongzhu Chen
- School of Pharmacy, Chongqing University of Arts and Sciences, Chongqing, Yongchuan 402160, PR China
| | - Kaiming Zhang
- School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Sichuan, Zigong 643000, PR China
| | - Weidong Jiang
- School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Sichuan, Zigong 643000, PR China.
| |
Collapse
|
9
|
Anjomshoa M, Amirheidari B. Nuclease-like metalloscissors: Biomimetic candidates for cancer and bacterial and viral infections therapy. Coord Chem Rev 2022; 458:214417. [PMID: 35153301 PMCID: PMC8816526 DOI: 10.1016/j.ccr.2022.214417] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 01/09/2022] [Indexed: 12/25/2022]
Abstract
Despite the extensive and rapid discovery of modern drugs for treatment of cancer, microbial infections, and viral illnesses; these diseases are still among major global health concerns. To take inspiration from natural nucleases and also the therapeutic potential of metallopeptide antibiotics such as the bleomycin family, artificial metallonucleases with the ability of promoting DNA/RNA cleavage and eventually affecting cellular biological processes can be introduced as a new class of therapeutic candidates. Metal complexes can be considered as one of the main categories of artificial metalloscissors, which can prompt nucleic acid strand scission. Accordingly, biologists, inorganic chemists, and medicinal inorganic chemists worldwide have been designing, synthesizing and evaluating the biological properties of metal complexes as artificial metalloscissors. In this review, we try to highlight the recent studies conducted on the nuclease-like metalloscissors and their potential therapeutic applications. Under the light of the concurrent Covid-19 pandemic, the human need for new therapeutics was highlighted much more than ever before. The nuclease-like metalloscissors with the potential of RNA cleavage of invading viral pathogens hence deserve prime attention.
Collapse
|
10
|
Jana NC, Ghorai P, Brandão P, Jagličić Z, Panja A. Proton controlled synthesis of two dicopper(II) complexes and their magnetic and biomimetic catalytic studies together with probing the binding mode of the substrate to the metal center. Dalton Trans 2021; 50:15233-15247. [PMID: 34623364 DOI: 10.1039/d1dt02369a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
This paper describes the synthesis, and structural and spectroscopic characterizations of two doubly bridged dicopper(II) complexes, [Cu2(μ-H2L)(μ-OMe)](ClO4)4·2H2O (1) and [Cu2(μ-L)(μ-OH)](ClO4)2 (2), with a binucleating ligand (HL) derived from the Schiff base condensation of DFMP and N,N-dimethyldipropylenetriamine, and their biomimetic catalytic activities were related to CAO and phenoxazinone synthase using 3,5-di-tert-butylcatechol and o-aminophenol (OAPH), respectively, as model substrates. Structural studies reveal that the major differences in these structures appear to be from the distinct roles of the tertiary amine groups of the ligands, which are protonated in 1, whereas it coordinates the metal centers in 2. Magnetic studies disclose that two copper(II) centers are strongly antiferromagnetically coupled with slightly different J values, which is further interpreted and discussed. They exhibited very different biomimetic catalytic activities; whereas 2 is an efficient catalyst, complex 1 showed somewhat lower substrate oxidation. The higher reactivity in 2 is rationalized by the strong involvement of the tertiary amine group of the Schiff base ligand, where the substrate oxidation is favored because of the transfer of protons from the substrate to the tertiary amine group, showing the importance of the functional groups in proximity to the bimetallic active site. Emphasis was also given to probing the binding mode of the substrate using an electronically deficient tetrabromomocatechol (Br4CatH2) and the isolated compound [Cu6(μ-HL)2(μ-OH)2(Br4Cat)4](NO3)2·4H2O (3) which suggests that monodentate asymmetric binding of 3,5-di-tert-butylcatechol and OAPH occurs during the course of the catalytic reaction.
Collapse
Affiliation(s)
- Narayan Ch Jana
- Department of Chemistry, Panskura Banamali College, Panskura RS, West Bengal 721152, India.
| | - Pravat Ghorai
- Department of Chemistry, Panskura Banamali College, Panskura RS, West Bengal 721152, India. .,Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Paula Brandão
- Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Zvonko Jagličić
- Institute of Mathematics, Physics and Mechanics & Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia
| | - Anangamohan Panja
- Department of Chemistry, Panskura Banamali College, Panskura RS, West Bengal 721152, India. .,Department of Chemistry, Gokhale Memorial Girls' College, 1/1 Harish Mukherjee Road, Kolkata 700020, India
| |
Collapse
|
11
|
Gabriel P, Maranha FG, Nordlander E, Neves A, Terenzi H. A heterotrinuclear bioinspired coordination complex capable of binding to DNA and emulation of nuclease activity. J Inorg Biochem 2021; 226:111631. [PMID: 34717251 DOI: 10.1016/j.jinorgbio.2021.111631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 10/05/2021] [Accepted: 10/12/2021] [Indexed: 10/20/2022]
Abstract
The investigation of compounds capable of strongly and selectively interacting with DNA comprises a field of research in constant development. In this work, we demonstrate that a trinuclear coordination complex based on a dinuclear Fe(III)Zn(II) core designed for biomimicry of the hydrolytic enzyme kidney bean purple acid phosphatase, containing an additional pendant arm coordinating a Pd(II) ion, has the ability to interact with DNA and to promote its hydrolytic cleavage. These results were found through analysis of plasmid DNA interaction and cleavage by the trinuclear complex 1 and its derivatives 2 and 3, in addition to the analysis of alteration in the DNA structure in the presence of the complexes through circular dichroism and DNA footprinting techniques. The suggested covalent interaction of the palladium-containing complex with DNA was analysed using an electrophoretic mobility assay, circular dichroism, high resolution gel separation techniques and kinetic analysis. This is a new and promising metal complex targeted to nucleic acids and acting in two separate ways: strong DNA interaction and hydrolytic cleavage.
Collapse
Affiliation(s)
- Philipe Gabriel
- Centro de Biologia Molecular Estrutural, Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis 88040-970, Brazil
| | - Filipy Gobbo Maranha
- Laboratório de Bioinorgânica e Cristalografia, Departamernto de Química, Universidade Federal de Santa Catarina, Florianópolis 88040-970, Brazil
| | - Ebbe Nordlander
- Chemical Physics, Department of Chemistry, Lund University, Lund, Box 124, SE-221 00, Sweden
| | - Ademir Neves
- Laboratório de Bioinorgânica e Cristalografia, Departamernto de Química, Universidade Federal de Santa Catarina, Florianópolis 88040-970, Brazil
| | - Hernán Terenzi
- Centro de Biologia Molecular Estrutural, Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis 88040-970, Brazil.
| |
Collapse
|
12
|
Camargo TP, Oliveira JAF, Costa TG, Szpoganicz B, Bortoluzzi AJ, Marzano IM, Silva-Caldeira PP, Bucciarelli-Rodriguez M, Pereira-Maia EC, Castellano EE, Peralta RA, Neves A. New Al IIIZn II and Al IIICu II dinuclear complexes: Phosphatase-like activity and cytotoxicity. J Inorg Biochem 2021; 219:111392. [PMID: 33752123 DOI: 10.1016/j.jinorgbio.2021.111392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Revised: 02/01/2021] [Accepted: 02/06/2021] [Indexed: 10/21/2022]
Abstract
Herein, we report the synthesis and characterization of the first two AlIII(μ-OH)MII (M = Zn (1) and Cu (2)) complexes with the unsymmetrical ligand H2L{2-[[(2-hydroxybenzyl)(2-pyridylmethyl)]aminomethyl]-6-bis(pyridylmethyl)aminomethyl}-4-methylphenol. The complexes were characterized through elemental analysis, X-ray crystallography, IR spectroscopy, mass spectrometry and potentiometric titration. In addition, complex 2 was characterized by electronic spectroscopy. Kinetics studies on the hydrolysis of the model substrate bis(2,4-dinitrophenyl)phosphate by 1 and 2 show Michaelis-Menten behavior, with 1 being slightly more active (8.31%) than 2 (at pH 7.0). The antimicrobial effect of the compounds was studied using four bacterial strains (Staphylococcus aureus, Pseudomonas aeuruginosa, Shigella sonnei and Shigella dysenteriae) and for both complexes the inhibition of bacterial growth was superior to that caused by sulfapyridine, but inferior to that of tetracycline. The dark cytotoxicity and photocytotoxicity (under UV-A light) of the complexes in a chronic myelogenous leukemia cell line were investigated. Complexes 1 and 2 exhibited significant cytotoxic activity against K562 cells, which undergoes a 2-fold increase on applying 5 min of irradiation with UV-A light. Complex 2 was more effective and a good correlation between cytotoxicity and intracellular concentration was observed, the intracellular copper concentration required to inhibit 50% of cell growth being 3.5 × 10-15 mol cell-1.
Collapse
Affiliation(s)
- Tiago P Camargo
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - José A F Oliveira
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Thiago G Costa
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Bruno Szpoganicz
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Adailton J Bortoluzzi
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Ivana M Marzano
- Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | | | | | - Elene C Pereira-Maia
- Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - Eduardo E Castellano
- Instituto de Física, Universidade de São Paulo, São Carlos, SP 13360-979, Brazil
| | - Rosely A Peralta
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil
| | - Ademir Neves
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil.
| |
Collapse
|
13
|
Gomes MAGB, Fernandes C, Gahan LR, Schenk G, Horn A. Recent Advances in Heterogeneous Catalytic Systems Containing Metal Ions for Phosphate Ester Hydrolysis. Chemistry 2021; 27:877-887. [PMID: 32659052 DOI: 10.1002/chem.202002333] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 07/09/2020] [Indexed: 11/09/2022]
Abstract
Organophosphates are a class of organic compounds that are important for living organisms, forming the building blocks for DNA, RNA, and some essential cofactors. Furthermore, non-natural organophosphates are widely used in industrial applications, including as pesticides; in laundry detergents; and, unfortunately, as chemical weapons agents. In some cases, the natural degradation of organophosphates can take thousands of years; this longevity creates problems associated with handling and the storage of waste generated by such phosphate esters, in particular. Efforts to develop new catalysts for the cleavage of phosphate esters have progressed in recent decades, mainly in the area of homogeneous catalysis. In contrast, the development of heterogeneous catalysts for the hydrolysis of organophosphates has not been as prominent. Herein, examples of heterogeneous systems are described and the importance of the development of heterogeneous catalysts applicable to organophosphate hydrolysis is highlighted, shedding light on recent advances related to different solid matrices that have been employed.
Collapse
Affiliation(s)
| | - Christiane Fernandes
- Departamento de Química, Universidade Federal de Santa Catarina, Campus Trindade, Florianópolis, SC, 88040-900, Brazil
| | - Lawrence R Gahan
- School of Chemistry and Microbial Sciences, The University of Queensland, Brisbane, 4072, Australia
| | - Gerhard Schenk
- School of Chemistry and Microbial Sciences, The University of Queensland, Brisbane, 4072, Australia
| | - Adolfo Horn
- Departamento de Química, Universidade Federal de Santa Catarina, Campus Trindade, Florianópolis, SC, 88040-900, Brazil
| |
Collapse
|
14
|
Jana NC, Jagličić Z, Brandão P, Adak S, Saha A, Panja A. A novel triple aqua-, phenoxo- and carboxylato-bridged dinickel( ii) complex, its magnetic properties, and comparative biomimetic catalytic studies with analogous dinickel( ii) complexes. NEW J CHEM 2021. [DOI: 10.1039/d1nj00708d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A unique triply bridged dinickel(ii) complex and two doubly bridged dinickel(ii) complexes are reported, and their magnetic properties and comparative biomimetic catalytic performances are studied.
Collapse
Affiliation(s)
- Narayan Ch. Jana
- Department of Chemistry
- Panskura Banamali College
- Panskura RS
- India
| | - Zvonko Jagličić
- Institute of Mathematics
- Physics and Mechanics & Faculty of Civil and Geodetic Engineering
- University of Ljubljana
- 1000 Ljubljana
- Slovenia
| | - Paula Brandão
- Department of Chemistry
- CICECO-Aveiro Institute of Materials
- University of Aveiro
- 3810-193 Aveiro
- Portugal
| | - Sarmistha Adak
- Department of Chemistry
- Panskura Banamali College
- Panskura RS
- India
- Department of Chemistry
| | - Amrita Saha
- Department of Chemistry
- Jadavpur University
- Kolkata-700032
- India
| | - Anangamohan Panja
- Department of Chemistry
- Panskura Banamali College
- Panskura RS
- India
- Department of Chemistry
| |
Collapse
|
15
|
Majumder A, Dutta N, Haldar S, Das A, Carrella L, Bera M. Aromatic dicarboxylate incorporated new di- and tetranuclear cobalt(II) complexes: Synthetic and structural aspects, and evaluation of properties and catalytic activity. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119752] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
16
|
Zhang Q, Shu J, Zhang Y, Xu Z, Yue J, Liu X, Xu B, Chen Z, Jiang W. Structures and esterolytic reactivity of novel binuclear copper(ii) complexes with reduced l-serine Schiff bases as mimic carboxylesterases. Dalton Trans 2020; 49:10261-10269. [PMID: 32672259 DOI: 10.1039/d0dt01823f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three novel binuclear copper(ii) complexes with reduced l-serine Schiff bases were synthesized and their structures were analyzed with single-crystal X-ray diffraction and DFT calculations. The crystal data revealed that all of these binuclear complexes are chiral. Both 5-halogenated (bromo- and chloro-) binuclear complexes exhibit right-handed helix structural character. Interestingly, the 5-methyl-containing analogue has a two-dimensional pore structure. In this paper, the esterolysis reactivity of the as-prepared complexes shows that in the hydrolysis of p-nitrophenyl acetate (PNPA) these three complexes provide 26, 18, 40-fold rate acceleration as compared to the spontaneous hydrolysis of PNPA at pH 7.0, respectively. Under selected conditions, in excess buffered aqueous solution a rate enhancement by three orders of magnitude was observed for the catalytic hydrolysis of another carboxylic ester, p-nitrophenyl picolinate (PNPP). These complexes efficiently promoted PNPP hydrolysis in a micellar solution of cetyltrimethylammonium bromide (CTAB), giving rise to a rate enhancement in excess of four orders of magnitude, which is approximately 2.0-3.2 times higher than that in the buffer.
Collapse
Affiliation(s)
- Qin Zhang
- School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Sichuan Zigong 643000, P. R. China.
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Chaves CC, Farias G, Formagio MD, Neves A, Peralta RM, Mikcha JM, de Souza B, Peralta RA. Three new dinuclear nickel(II) complexes with amine pendant-armed ligands: Characterization, DFT study, antibacterial and hydrolase-like activity. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119559] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
18
|
Castilho N, Gabriel P, Camargo TP, Neves A, Terenzi H. Targeting an Artificial Metal Nuclease to DNA by a Simple Chemical Modification and Its Drastic Effect on Catalysis. ACS Med Chem Lett 2020; 11:286-291. [PMID: 32184958 DOI: 10.1021/acsmedchemlett.9b00289] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 08/12/2019] [Indexed: 12/17/2022] Open
Abstract
A novel metal complex was synthesized containing a purine derived ligand in order to increase its binding to DNA. We observed a huge increase in nuclease activity and, quite interestingly, an improvement on DNA sequence selectivity. A potential site of specific cleavage in the presence of a reductant in the reaction medium is suggested. We were able to synthesize a novel metal nuclease with improved activity on DNA, and with sequence specificity when exposed to a coreactant, this opens up new possibilities to create site specific and redox status modulated artificial nucleases.
Collapse
Affiliation(s)
- Nathalia Castilho
- Centro de Biologia Molecular Estrutural, Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040900 Florianópolis-SC, Brazil
| | - Philipe Gabriel
- Centro de Biologia Molecular Estrutural, Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040900 Florianópolis-SC, Brazil
| | - Tiago Pacheco Camargo
- Departamento de Química, Universidade Federal de Santa Catarina, 88040900 Florianópolis-SC, Brazil
| | - Ademir Neves
- Departamento de Química, Universidade Federal de Santa Catarina, 88040900 Florianópolis-SC, Brazil
| | - Hernán Terenzi
- Centro de Biologia Molecular Estrutural, Departamento de Bioquímica, Universidade Federal de Santa Catarina, 88040900 Florianópolis-SC, Brazil
| |
Collapse
|
19
|
Maranha FG, dos Santos Silva GA, Bortoluzzi AJ, Nordlander E, Peralta RA, Neves A. A new heteropentanuclear complex containing the [Fe2IIIZn3II(μ-OH)3] structural motif as a model for purple acid phosphatases. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2019.119280] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
20
|
Polynuclear zinc(II) complexes of thiosemicarbazone: Synthesis, X-ray structure and biological evaluation. J Inorg Biochem 2019; 203:110908. [PMID: 31683125 DOI: 10.1016/j.jinorgbio.2019.110908] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 10/21/2019] [Accepted: 10/27/2019] [Indexed: 01/23/2023]
Abstract
Two new dimeric Zn(II) ([{ZnL1(DMSO2)}2]·DMSO (1), [{ZnL2Cl}2] (2)) and a novel tetrameric Zn(II) complex ([(Zn2L3)2(μ-OAc)2(μ3-O)2] (3)), where H2L1 = 4-(p-methoxyphenyl) thiosemicarbazone of o-hydroxynapthaldehyde, HL2 = 4-(p-methoxyphenyl)thiosemicarbazone of benzoyl pyridine and H2L3 = 4-(p-chlorophenyl)thiosemicarbazone of o-vanillin are reported. Ligands and their complexes were characterized by spectroscopic and single crystal X-ray diffraction techniques. In addition, the complexes exhibited good binding affinity towards HSA (1012 M-1), which is supported by their ability to quench the tryptophan fluorescence emission spectra of HSA. The complexes were also screened for their DNA binding propensity through UV-vis absorption titration, circular dichroism and fluorescence spectral studies. Results show that they effectively interact with CT-DNA through an intercalative mode of binding, with binding constants ranging from 103 to 104 M-1. Among the three complexes 1 has the highest binding affinity towards CT-DNA. Further, the phosphatase activity was evaluated using bis(2,4-dinitrophenyl)phosphate (BDNPP) as substrate, however, the complexes did not yield any measurable catalytic activity. Nevertheless the complexes showed significant cytotoxic potential against HeLa and HT-29 cancer cell lines that was assessed through MTT assay and DAPI staining. Remarkably, complex 1 showed better activity than cisplatin against HT-29 cell line.
Collapse
|
21
|
Singh A, Raj P, Singh A, Dubowski JJ, Kaur N, Singh N. Metal-Organocatalyst for Detoxification of Phosphorothioate Pesticides: Demonstration of Acetylcholine Esterase Activity. Inorg Chem 2019; 58:9773-9784. [PMID: 31318533 DOI: 10.1021/acs.inorgchem.9b00770] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In recent years, transition metal complexes have been developed for catalytical degradation of a phosphate ester bond, particularly in RNA and DNA; however, less consideration has been given for development of complexes for the degradation of a phosphorothioate bond, as they are the foremost used pesticides in the environment and are toxic to human beings. In this context, we have developed copper complexes of benzimidazolium based ligands for catalytical degradation of a series of organophosphates (parathion, paraoxon, methyl-parathion) at ambient conditions. The copper complexes (assigned as N1-N3) were characterized using single X-ray crystallography which revealed that all three complexes are mononuclear and distorted square planner in geometry. Further, the solution state studies of the prepared complexes were carried out using UV-visible absorption, fluorescence spectroscopy, and cyclic voltametry. The complexes N1 and N2 have benzimidazolium ionic liquid as base attached with two 2-mercapto-benzimidazole pods, whereas complex N3 contains a nonionic ligand. The synthesized copper complexes were evaluated for their catalytic activity for degradation of organophosphates. It is interesting that the complex containing the ionic ligand efficiently degrades phosphorothioate pesticides, whereas complex N3 was not found to be appropriate for degradation due to a weaker conversion rate. The organophosphate degradation studies were monitored by recording absorbance spectra of parathion in the presence of catalyst, i.e., copper complexes with respect to time. The parathion was hydrolyzed into para-nitrophenol and diethyl thiophosphate. Moreover, to analyze the inhibition activity of the pesticides toward acetylcholine esterase enzyme in the presence of prepared metal complexes, Ellman's assay was performed and revealed that, within 20 min, the inhibition of acetylcholine esterase enzyme decreases by up to 13%.
Collapse
Affiliation(s)
- Amanpreet Singh
- Department of Chemistry , Indian Institute of Technology Ropar , Punjab 140001 , India
| | - Pushap Raj
- Department of Chemistry , Indian Institute of Technology Ropar , Punjab 140001 , India
| | - Ajnesh Singh
- Department of Applied Sciences and Humanities , Jawaharlal Nehru Govt. Engineering College , Sundernagar , Mandi (H.P.) , 175018 , India
| | - Jan J Dubowski
- Laboratory for Quantum Semiconductors and Photo-based Biotechnology, Interdisciplinary Institute for Technological Innovation (3IT), CNRS UMI-3463, Department of Electrical and Computer Engineering , Universite de Sherbrooke , 3000 Boulevard de l'Université , Sherbrooke , QC J1K 0A5 , Canada
| | - Navneet Kaur
- Department of Chemistry , Panjab University , Chandigarh , 160014 , India
| | - Narinder Singh
- Department of Chemistry , Indian Institute of Technology Ropar , Punjab 140001 , India
| |
Collapse
|
22
|
Guanidine- and purine-functionalized ligands of FeIIIZnII complexes: effects on the hydrolysis of DNA. J Biol Inorg Chem 2019; 24:675-691. [DOI: 10.1007/s00775-019-01680-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 06/21/2019] [Indexed: 01/01/2023]
|
23
|
Heying RS, da Silva MP, Wecker GS, Peralta RA, Bortoluzzi AJ, Neves A. Unusual hydrolase-like activity of a mononuclear Fe(III) complex. INORG CHEM COMMUN 2019. [DOI: 10.1016/j.inoche.2019.01.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
24
|
Erxleben A. Mechanistic Studies of Homo- and Heterodinuclear Zinc Phosphoesterase Mimics: What Has Been Learned? Front Chem 2019; 7:82. [PMID: 30847339 PMCID: PMC6393734 DOI: 10.3389/fchem.2019.00082] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 01/30/2019] [Indexed: 11/13/2022] Open
Abstract
Phosphoesterases hydrolyze the phosphorus oxygen bond of phosphomono-, di- or triesters and are involved in various important biological processes. Carboxylate and/or hydroxido-bridged dizinc(II) sites are a widespread structural motif in this enzyme class. Much effort has been invested to unravel the mechanistic features that provide the enormous rate accelerations observed for enzymatic phosphate ester hydrolysis and much has been learned by using simple low-molecular-weight model systems for the biological dizinc(II) sites. This review summarizes the knowledge and mechanistic understanding of phosphoesterases that has been gained from biomimetic dizinc(II) complexes, showing the power as well as the limitations of model studies.
Collapse
Affiliation(s)
- Andrea Erxleben
- School of Chemistry, National University of Ireland Galway, Galway, Ireland
| |
Collapse
|
25
|
Palopoli C, Ferreyra J, Conte-Daban A, Richezzi M, Foi A, Doctorovich F, Anxolabéhère-Mallart E, Hureau C, Signorella SR. Insights into Second-Sphere Effects on Redox Potentials, Spectroscopic Properties, and Superoxide Dismutase Activity of Manganese Complexes with Schiff-Base Ligands. ACS OMEGA 2019; 4:48-57. [PMID: 31459311 PMCID: PMC6649300 DOI: 10.1021/acsomega.8b03018] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 12/20/2018] [Indexed: 05/04/2023]
Abstract
Six Mn-Schiff base complexes, [Mn(X-salpn)]0/+ (salpn = 1,3-bis(sal-ic-ylidenamino)propane, X = H [1], 5-Cl [2], 2,5-F2 [3], 3,5-Cl2 [4], 5-NO2 [5], 3,5-(NO2)2 [6]), were synthesized and characterized in solution, and second-sphere effects on their electrochemical and spectroscopic properties were analyzed. The six complexes catalyze the dismutation of superoxide with catalytic rate constants in the range 0.65 to 1.54 × 106 M-1 s-1 obtained through the nitro blue tetrazolium photoreduction inhibition superoxide dismutases assay, in aqueous medium of pH 7.8. In solution, these compounds possess two labile solvent molecules in the axial positions favoring coordination of the highly nucleophilic O2 •- to the metal center. Even complex 5, [Mn(5-(NO2)salpn) (OAc) (H2O)], with an axial acetate in the solid state, behaves as a 1:1 electrolyte in methanolic solution. Electron paramagnetic resonance and UV-vis monitoring of the reaction of [Mn(X-salpn)]0/+ with KO2 demonstrates that in diluted solutions these complexes behave as catalysts supporting several additions of excess O2 •-, but at high complex concentrations (≥0.75 mM) catalyst self-inhibition occurs by the formation of a catalytically inactive dimer. The correlation of spectroscopic, electrochemical, and kinetics data suggest that second-sphere effects control the oxidation states of Mn involved in the O2 •- dismutation cycle catalyzed by complexes 1-6 and modulate the strength of the Mn-substrate adduct for electron-transfer through an inner-sphere mechanism.
Collapse
Affiliation(s)
- Claudia Palopoli
- IQUIR
(Instituto de Química Rosario), Consejo Nacional de Investigaciones
Científicas y Técnicas (CONICET), Facultad de Ciencias
Bioquímicas y Farmacéuticas, Universidad Nacional de
Rosario, Suipacha 531, S2002LRK Rosario, Argentina
| | - Joaquín Ferreyra
- IQUIR
(Instituto de Química Rosario), Consejo Nacional de Investigaciones
Científicas y Técnicas (CONICET), Facultad de Ciencias
Bioquímicas y Farmacéuticas, Universidad Nacional de
Rosario, Suipacha 531, S2002LRK Rosario, Argentina
| | | | - Micaela Richezzi
- IQUIR
(Instituto de Química Rosario), Consejo Nacional de Investigaciones
Científicas y Técnicas (CONICET), Facultad de Ciencias
Bioquímicas y Farmacéuticas, Universidad Nacional de
Rosario, Suipacha 531, S2002LRK Rosario, Argentina
| | - Ana Foi
- Departamento
de Química Inorgánica, Analítica y Química
Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA Buenos Aires, Argentina
| | - Fabio Doctorovich
- Departamento
de Química Inorgánica, Analítica y Química
Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA Buenos Aires, Argentina
| | - Elodie Anxolabéhère-Mallart
- Laboratoire
d’Electrochimie Moléculaire UMR CNRS-P7 7591, Université
Paris Diderot-Paris, 15 rue Jean-Antoine de Baïf, 75205 Paris Cedex 13, France
| | - Christelle Hureau
- LCC-CNRS,
Université de Toulouse, 205 route de Narbonne, 31077 Toulouse, France
| | - Sandra R. Signorella
- IQUIR
(Instituto de Química Rosario), Consejo Nacional de Investigaciones
Científicas y Técnicas (CONICET), Facultad de Ciencias
Bioquímicas y Farmacéuticas, Universidad Nacional de
Rosario, Suipacha 531, S2002LRK Rosario, Argentina
| |
Collapse
|
26
|
Chagas MA, Pereira ES, Godinho MPB, Da Silva JCS, Rocha WR. Base Mechanism to the Hydrolysis of Phosphate Triester Promoted by the Cd2+/Cd2+ Active site of Phosphotriesterase: A Computational Study. Inorg Chem 2018; 57:5888-5902. [DOI: 10.1021/acs.inorgchem.8b00361] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Marcelo A. Chagas
- LQC-MM: Laboratório de Química Computacional e Modelagem Molecular Departamento de Química, ICEx, Universidade Federal de Minas Gerais 31270-901 Pampulha, Belo Horizonte, Minas Gerais, Brazil
| | - Eufrásia S. Pereira
- LQC-MM: Laboratório de Química Computacional e Modelagem Molecular Departamento de Química, ICEx, Universidade Federal de Minas Gerais 31270-901 Pampulha, Belo Horizonte, Minas Gerais, Brazil
| | - Marina P. B. Godinho
- LQC-MM: Laboratório de Química Computacional e Modelagem Molecular Departamento de Química, ICEx, Universidade Federal de Minas Gerais 31270-901 Pampulha, Belo Horizonte, Minas Gerais, Brazil
| | - Júlio Cosme S. Da Silva
- LQC-MM: Laboratório de Química Computacional e Modelagem Molecular Departamento de Química, ICEx, Universidade Federal de Minas Gerais 31270-901 Pampulha, Belo Horizonte, Minas Gerais, Brazil
- GQC: Grupo de Química Computacional Instituto de Química e Biotecnologia, IQB, Universidade Federal de Alagoas Campus A. C. Simões, 57072-900 Maceió, Alagoas, Brazil
| | - Willian R. Rocha
- LQC-MM: Laboratório de Química Computacional e Modelagem Molecular Departamento de Química, ICEx, Universidade Federal de Minas Gerais 31270-901 Pampulha, Belo Horizonte, Minas Gerais, Brazil
| |
Collapse
|