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Zhang H, Wang P, Zhang J, Sun Q, He Q, He X, Chen H, Ji H. Boosting the Catalase-Like Activity of SAzymes via Facile Tuning of the Distances between Neighboring Atoms in Single-Iron Sites. Angew Chem Int Ed Engl 2024; 63:e202316779. [PMID: 38100508 DOI: 10.1002/anie.202316779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Revised: 12/04/2023] [Accepted: 12/15/2023] [Indexed: 12/17/2023]
Abstract
A nanozyme with neighboring single-iron sites (Fe2 -SAzyme) was introduced as a bioinspired catalase mimic, featuring excellent activity under varied conditions, twice as high as that of random Fe1 -SAzyme and ultrahigh H2 O2 affinity as that of bioenzymes. Surprisingly, the interatomic spacing tuning between adjacent iron sites also suppressed the competitive peroxidase pathway, remarkably increasing the catalase/peroxidase selectivity up to ~6 times compared to Fe1 -SAzyme. This dramatically switched the catalytic activity of Fe-SAzymes from generating (i.e. Fe1 -SAzymes, preferably mimicking peroxidase) to scavenging ROS (i.e. Fe2 -SAzymes, dominantly mimicking catalase). Theoretical and experimental investigations suggested that the pairwise single-iron sites may serve as a robust molecular tweezer to efficiently trap and decompose H2 O2 into O2 , via cooperative hydrogen-bonding induced end-bridge adsorption. The versatile mechano-assisted in situ MOF capsulation strategy enabled facile access to neighboring M2 -SAzyme (M=Fe, Ir, Pt), even up to a 1000 grams scale, but with no obvious scale-up effect for both structures and performances.
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Affiliation(s)
- Hao Zhang
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Pengbo Wang
- School of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, P. R. China
| | - Jingru Zhang
- School of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, P. R. China
| | - Qingdi Sun
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Qian He
- School of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, P. R. China
| | - Xiaohui He
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Hongyu Chen
- School of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, P. R. China
| | - Hongbing Ji
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China
- State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Institute of Green Petroleum Processing and Light Hydrocarbon Conversion, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
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2
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Tverdokhlebova A, Sterin I, Darie CC, Katz E, Smutok O. Stimulation-Inhibition of Protein Release from Alginate Hydrogels Using Electrochemically Generated Local pH Changes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:57408-57418. [PMID: 36516447 DOI: 10.1021/acsami.2c17914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The electrochemically controlled release of proteins was studied in a Ca2+-cross-linked alginate hydrogel deposited on an electrode surface. The electrochemical oxidation of ascorbate or reduction of O2 was achieved upon applying electrical potentials +0.6 or -0.8 V (vs Ag/AgCl/KCl 3 M), respectively, resulting in decreasing or increasing pH locally near an electrode surface. The obtained local acidic solution resulted in the protonation of carboxylic groups in the alginate hydrogel and, as a result, the formation of a hydrophobic shrunken hydrogel film. Conversely, the produced alkaline local environment resulted in a hydrophilic swollen hydrogel film. The release of the proteins was effectively inhibited from the shrunk hydrogel and activated from the swollen hydrogel film. Overall, the electrochemically produced local pH changes allowed control over the biomolecule release process. While the release inhibition by applying +0.6 V was always effective and could be maintained as long as the positive potential was applied, the release activation was different depending on the protein molecular size, being more effective for smaller species, and molecule charge, being more effective for negatively charged species. The repetitive change from the inhibited to stimulated state of the biomolecule release process was obtained upon cyclic application of oxidative and reductive potentials (+0.6 V ↔ -0.8 V). The alginate hydrogel film shrinking-swelling as well as the protein release process were studied and visualized using a confocal fluorescent microscope. In order to be observed, an external surface of the alginate film and the loaded protein molecules were labeled with different fluorescent dyes, which then produced colored fluorescent images under a confocal microscope.
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Affiliation(s)
- Anna Tverdokhlebova
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
| | - Ilya Sterin
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
| | - Costel C Darie
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
- Biochemistry & Proteomics Laboratories, Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
| | - Evgeny Katz
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
| | - Oleh Smutok
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
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3
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Zhang L, Baslyman W, Yang P, Khashab NM. Customized mesoporous metal organic frameworks engender stable enzymatic nanoreactors. Chem Commun (Camb) 2019; 55:620-623. [DOI: 10.1039/c8cc08790c] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Here, the porosity of a metal organic framework (MIL-101) is tailored by the choice of the solvent occupying the pores in a template free acid etching process.
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Affiliation(s)
- Liwen Zhang
- Smart Hybrid Materials (SHMs) Laboratory
- Advanced Membranes and Porous Materials Center
- King Abdullah University of Science and Technology (KAUST)
- Thuwal 23955-6900
- Saudi Arabia
| | - Walaa Baslyman
- Smart Hybrid Materials (SHMs) Laboratory
- Advanced Membranes and Porous Materials Center
- King Abdullah University of Science and Technology (KAUST)
- Thuwal 23955-6900
- Saudi Arabia
| | - Peng Yang
- Smart Hybrid Materials (SHMs) Laboratory
- Advanced Membranes and Porous Materials Center
- King Abdullah University of Science and Technology (KAUST)
- Thuwal 23955-6900
- Saudi Arabia
| | - Niveen M. Khashab
- Smart Hybrid Materials (SHMs) Laboratory
- Advanced Membranes and Porous Materials Center
- King Abdullah University of Science and Technology (KAUST)
- Thuwal 23955-6900
- Saudi Arabia
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4
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Ghavamipour F, Sajedi RH, Khajeh K. A chemiluminescence-based catalase assay using H 2O 2-sensitive CdTe quantum dots. Mikrochim Acta 2018; 185:376. [PMID: 30014207 DOI: 10.1007/s00604-018-2912-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Accepted: 07/05/2018] [Indexed: 10/28/2022]
Abstract
A method is described for the chemiluminescence based determination of the activity of catalase (CAT) using H2O2-sensitive CdTe quantum dots (QDs). It is based on the finding that the chemiluminescence (CL) of the CdTe/H2O2 system is reduced due to the consumption of H2O2 by the catalytic action of CAT. The Michaelis constant is calculated to be 519 ± 27 mM, showing the potential of the method to accurately measure the Km compared to the standard method. The method does not require QDs to be conjugated to biological/organic molecules and therefore is considered to be a rapid and convenient method for determination of CAT in real samples. At an incubation time of 2 s, the LOD was calculated to be 4.5 unit/mL, with a linear range from 6 to 400 unit/mL. The assay is sensitive, simple, and suitable for practical applications. Graphical abstract Schematic representation of chemiluminescence-based catalase U(CAT) assay using the CdSe QD/H2O2 system. The reduction of H2O2 is reflected by the chemiluminescence of the QDs. A mechanism is put forward based on the changes in chemiluminescence intensity of the QDs by the consumption of H2O2 due to the catalytic action of CAT.
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Affiliation(s)
- Fahimeh Ghavamipour
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, 14115-154, Iran
| | - Reza H Sajedi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, 14115-154, Iran.
| | - Khosro Khajeh
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, 14115-154, Iran
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5
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Sun L, Gao Y, Xu Y, Chao J, Liu H, Wang L, Li D, Fan C. Real-Time Imaging of Single-Molecule Enzyme Cascade Using a DNA Origami Raft. J Am Chem Soc 2017; 139:17525-17532. [DOI: 10.1021/jacs.7b09323] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Lele Sun
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanjing Gao
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yan Xu
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jie Chao
- Key
Laboratory for Organic Electronics and Information Displays (KLOEID),
Institute of Advanced Materials (IAM), School of Materials Science
and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
| | - Huajie Liu
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Lianhui Wang
- Key
Laboratory for Organic Electronics and Information Displays (KLOEID),
Institute of Advanced Materials (IAM), School of Materials Science
and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
| | - Di Li
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Chunhai Fan
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
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6
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Lee KT, Lu YJ, Mi FL, Burnouf T, Wei YT, Chiu SC, Chuang EY, Lu SY. Catalase-Modulated Heterogeneous Fenton Reaction for Selective Cancer Cell Eradication: SnFe 2O 4 Nanocrystals as an Effective Reagent for Treating Lung Cancer Cells. ACS APPLIED MATERIALS & INTERFACES 2017; 9:1273-1279. [PMID: 28006093 DOI: 10.1021/acsami.6b13529] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Heterogeneous Fenton reactions have been proven to be an effective and promising selective cancer cell treatment method. The key working mechanism for this method to achieve the critical therapeutic selectivity however remains unclear. In this study, we proposed and demonstrated for the first time the critical role played by catalase in realizing the therapeutic selectivity for the heterogeneous Fenton reaction-driven cancer cell treatment. The heterogeneous Fenton reaction, with the lattice ferric ions of the solid catalyst capable of converting H2O2 to highly reactive hydroxyl radicals, can effectively eradicate cancer cells. In this study, SnFe2O4 nanocrystals, a recently discovered outstanding heterogeneous Fenton catalyst, were applied for selective killing of lung cancer cells. The SnFe2O4 nanocrystals, internalized into the cancer cells, can effectively convert endogenous H2O2 into highly reactive hydroxyl radicals to invoke an intensive cytotoxic effect on the cancer cells. On the other hand, catalase, present at a significantly higher concentration in normal cells than in cancer cells, remarkably can impede the apoptotic cell death induced by the internalized SnFe2O4 nanocrystals. According to the results obtained from the in vitro cytotoxicity study, the relevant oxidative attacks were effectively suppressed by the presence of normal physiological levels of catalase. The SnFe2O4 nanocrystals were thus proved to effect apoptotic cancer cell death through the heterogeneous Fenton reaction and were benign to cells possessing normal physiological levels of catalase. The catalase modulation of the involved heterogeneous Fenton reaction plays the key role in achieving selective cancer cell eradication for the heterogeneous Fenton reaction-driven cancer cell treatment.
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Affiliation(s)
- Kuan-Ting Lee
- Technology Research Development Department, Plastics Industry Development Center , Taichung 40768, Taiwan ( ROC )
| | - Yu-Jen Lu
- Department of Neurosurgery and ⬡Center for Advanced Molecular Imaging and Translation, Chang Gung Memorial Hospital , Tao-Yuan 33302, Taiwan ( ROC )
| | | | | | - Yi-Ting Wei
- Technology Research Development Department, Plastics Industry Development Center , Taichung 40768, Taiwan ( ROC )
| | | | | | - Shih-Yuan Lu
- Department of Chemical Engineering, National Tsing Hua University , Hsinchu 30013, Taiwan ( ROC )
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7
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Heme-coordinated histidine residues form non-specific functional ferritin-heme peroxidase system: Possible and partial mechanistic relevance to oxidative stress-mediated pathology in neurodegenerative diseases. Int J Biol Macromol 2016; 91:368-80. [DOI: 10.1016/j.ijbiomac.2016.05.059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 05/13/2016] [Accepted: 05/14/2016] [Indexed: 01/07/2023]
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8
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Ribeiro RP, Moreira ELG, Santos DB, Colle D, Dos Santos AA, Peres KC, Figueiredo CP, Farina M. Probucol affords neuroprotection in a 6-OHDA mouse model of Parkinson's disease. Neurochem Res 2013; 38:660-8. [PMID: 23334712 DOI: 10.1007/s11064-012-0965-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Revised: 12/21/2012] [Accepted: 12/26/2012] [Indexed: 01/24/2023]
Abstract
Parkinson's disease (PD) is a neurodegenerative disorder characterized by the degeneration of dopaminergic nigrostriatal neurons. Although the etiology of the majority of human PD cases is unknown, experimental evidence points to oxidative stress as an early and causal event. Probucol is a lipid-lowering phenolic compound with anti-inflammatory and antioxidant properties that has been recently reported as protective in neurotoxicity and neurodegeneration models. This study was designed to investigate the effects of probucol on the vulnerability of striatal dopaminergic neurons to oxidative stress in a PD in vivo model. Swiss mice were treated with probucol during 21 days (11.8 mg/kg; oral route). Two weeks after the beginning of treatment, mice received a single intracerebroventricular (i.c.v.) infusion of 6-hydroxydopamine (6-OHDA). On the 21st day, locomotor performance, striatal oxidative stress-related parameters, and striatal tyrosine hydroxylase and synaptophysin levels, were measured as outcomes of toxicity. 6-OHDA-infused mice showed hyperlocomotion and a significant decrease in striatal tyrosine hydroxylase (TH) and synaptophysin levels. In addition, 6-OHDA-infused mice showed reduced superoxide dismutase activity and increased lipid peroxidation and catalase activity in the striatum. Notably, probucol protected against 6-OHDA-induced hyperlocomotion and striatal lipid peroxidation, catalase upregulation and decrease of TH levels. Overall, the present results show that probucol protects against 6-OHDA-induced toxicity in mice. These findings may render probucol as a promising molecule for further pharmacological studies on the search for disease-modifying treatment in PD.
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Affiliation(s)
- Renata Pietsch Ribeiro
- Programa de Pós-Graduação em Neurociências, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, 88040-900, Brazil.
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9
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The Euryhaline Yeast Debaryomyces hansenii has Two Catalase Genes Encoding Enzymes with Differential Activity Profile. Curr Microbiol 2010; 62:933-43. [DOI: 10.1007/s00284-010-9806-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2010] [Accepted: 10/21/2010] [Indexed: 10/18/2022]
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10
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Kawaguchi T, Ueda M, Tanaka A, Teramoto K. Efficient Expression of Peroxidatic Activity of Catalase in the Coupled System with Glucose Oxidase—a model of Yeast Peroxisomes. ACTA ACUST UNITED AC 2009. [DOI: 10.3109/10242428908992037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Toshiya Kawaguchi
- Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606, Japan
| | - Mitsuyoshi Ueda
- Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606, Japan
| | - Atsuo Tanaka
- Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606, Japan
| | - Kazuo Teramoto
- Biomaterials Research Institute Co., Ltd., 1, Taya-cho, Sakae-ku, Yokohama 244, Japan
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11
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Lu X, Kambe F, Cao X, Kozaki Y, Kaji T, Ishii T, Seo H. 3beta-Hydroxysteroid-delta24 reductase is a hydrogen peroxide scavenger, protecting cells from oxidative stress-induced apoptosis. Endocrinology 2008; 149:3267-73. [PMID: 18339707 DOI: 10.1210/en.2008-0024] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
3beta-Hydroxysteroid-Delta24 reductase (DHCR24) is an endoplasmic reticulum-resident, multifunctional enzyme that possesses antiapoptotic and cholesterol-synthesizing activities. To clarify the molecular basis of the former activity, we investigated the effects of hydrogen peroxide (H(2)O(2)) on embryonic fibroblasts prepared from DHCR24-knockout mice (DHCR24(-/-) mouse embryonic fibroblasts). H(2)O(2) exposure rapidly induced apoptosis, which was associated with sustained activation of apoptosis signal-regulating kinase-1 and stress-activated protein kinases, such as p38 MAPK and c-Jun N-terminal kinase. Complementation of the mouse embryonic fibroblasts by adenovirus expressing DHCR24 attenuated the H(2)O(2)-induced kinase activation and apoptosis. Concomitantly, intracellular generation of reactive oxygen species (ROS) in response to H(2)O(2) was also diminished by the adenovirus, suggesting a ROS-scavenging activity of DHCR24. Such antiapoptotic effects of DHCR24 were duplicated in pheochromocytoma PC12 cells infected with adenovirus. In addition, it was found that DHCR24 exerted cytoprotective effects in the tunicamycin-induced endoplasmic reticulum stress by eliminating ROS. Finally, using in vitro-synthesized and purified proteins, DHCR24 and its C-terminal deletion mutant were found to exhibit high H(2)O(2)-scavenging activity, whereas the N-terminal deletion mutant lost such activity. These results demonstrate that DHCR24 can directly scavenge H(2)O(2), thereby protecting cells from oxidative stress-induced apoptosis.
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Affiliation(s)
- Xiuli Lu
- Department of Endocrinology, Research Institute of Environmental Medicine, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan
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12
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Shikama K. Nature of the FeO2 bonding in myoglobin and hemoglobin: A new molecular paradigm. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2005; 91:83-162. [PMID: 16005052 DOI: 10.1016/j.pbiomolbio.2005.04.001] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The iron(II)-dioxygen bond in myoglobin and hemoglobin is a subject of wide interest. Studies range from examinations of physical-chemical properties dependent on its electronic structure, to investigations of the stability as a function of oxygen supply. Among these, stability properties are of particular importance in vivo. Like all known dioxygen carriers synthesized so far with transition metals, the oxygenated forms of myoglobin and hemoglobin are known to be oxidized easily to their ferric met-forms, which cannot bind molecular oxygen and are therefore physiologically inactive. The mechanistic details of this autoxidation reaction, which are of clinical, as well as of physical-chemical, interest, have long been investigated by a number of authors, but a full understanding of the heme oxidation has not been reached so far. Recent kinetic and thermodynamic studies of the stability of oxymyoglobin (MbO2) and oxyhemoglobin (HbO2) have revealed new features in the FeO2 bonding. In vivo, the iron center is always subject to a nucleophilic attack of the water molecule or hydroxyl ion, which can enter the heme pocket from the surrounding solvent and thereby irreversibly displace the bound dioxygen from MbO2 or HbO2 in the form of O2- so that the iron is converted to the ferric met-form. Since the autoxidation reaction of MbO2 or HbO2 proceeds through a nucleophilic displacement following one-electron transfer from iron(II) to the bound O2, this reaction may be viewed as a meeting point of the stabilization and the activation of molecular oxygen performed by hemoproteins. Along with these lines of evidence, we finally discuss the stability property of human HbO2 and provide with the most recent state of hemoglobin research. The HbA molecule contains two types of alphabeta contacts and seems to differentiate them quite properly for its functional properties. The alpha1beta2 or alpha2beta1 contact is associated with the cooperative oxygen binding, whereas the alpha1beta1 or alpha2beta2 contact is used for controlling the stability of the bound O2. We can thus form a unified picture for hemoglobin function by closely integrating the cooperative and the stable binding of molecular oxygen with iron(II) in aqueous solvent. These new views on the nature of FeO2 bonding and the possible role of globin moiety in stabilizing MbO2 and HbO2 are of primary importance, not only for a full understanding of various hemoprotein reactions with O2, but also for planning new molecular designs for synthetic oxygen carriers which may be able to function in aqueous solvent and at physiological temperature.
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Affiliation(s)
- Keiji Shikama
- Biological Institute, Graduate School of Life Sciences, Tohoku University, Sendai, Japan.
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13
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Baud O, Greene AE, Li J, Wang H, Volpe JJ, Rosenberg PA. Glutathione peroxidase-catalase cooperativity is required for resistance to hydrogen peroxide by mature rat oligodendrocytes. J Neurosci 2004; 24:1531-40. [PMID: 14973232 PMCID: PMC6730475 DOI: 10.1523/jneurosci.3989-03.2004] [Citation(s) in RCA: 211] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Oxidative mechanisms of injury are important in many neurological disorders, including hypoxic-ischemic brain damage. Cerebral palsy after preterm birth is hypothesized to be caused by hypoxic-ischemic injury of developing oligodendrocytes (OLs). Here we examined the developmental sensitivity of OLs to exogenous hydrogen peroxide (H2O2) with stage-specific rat oligodendrocyte cultures. We found that H2O2 itself or that generated by glucose oxidase was more toxic to developing than to mature OLs. Mature OLs were able to degrade H2O2 faster than developing OLs, suggesting that higher antioxidant enzyme activity might be the basis for their resistance. Catalase expression and activity were relatively constant during oligodendrocyte maturation, whereas glutathione peroxidase (GPx) was upregulated with a twofold to threefold increase in its expression and activity. Thus, it appeared that the developmental change in resistance to H2O2 was caused by modulation of GPx but not by catalase expression. To test the relative roles of catalase and GPx in the setting of oxidative stress, we measured enzyme activity in cells exposed to H2O2 and found that H2O2 induced a decrease in catalase activity in developing but not in mature OLs. Inhibition of GPx by mercaptosuccinate led to an increase in the vulnerability of mature OLs to H2O2 as well as a reduction in catalase activity. Finally, H2O2-dependent inactivation of catalase in developing OLs was prevented by the GPx mimic ebselen. These data provide evidence for a key role for GPx-catalase cooperativity in the resistance of mature OLs to H2O2-induced cell death.
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Affiliation(s)
- Olivier Baud
- Department of Neurology, Division of Neuroscience, Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
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14
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Gerritsen M, Jansen JA, Kros A, Vriezema DM, Sommerdijk NA, Nolte RJ, Lutterman JA, Van Hövell SW, Van der Gaag A. Influence of inflammatory cells and serum on the performance of implantable glucose sensors. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2001; 54:69-75. [PMID: 11077404 DOI: 10.1002/1097-4636(200101)54:1<69::aid-jbm8>3.0.co;2-q] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The objective of this investigation was to evaluate the influence of polymorphonuclear granulocytes on the performance of uncoated and cellulose acetate/Nafion coated amperometric glucose sensors in vitro. The response of these sensors was also investigated in serum. Uncoated and coated sensors showed lower sensitivities to glucose, with a significant drift in sensor output upon exposure to serum or leukocytes. Although the use of a coating resulted in higher sensitivity, the progressive loss of output was not completely prevented. Stimulated granulocytes were shown to excrete components, probably catalase and myeloperoxidase, which consumed the hydrogen peroxide formed by the oxidation of glucose. In addition, adsorbed serum proteins formed a diffusional barrier for glucose. Furthermore, serum was found to contain low-molecular weight components that alone inhibited glucose oxidase activity. Based on preliminary electrochemical results, we postulate that rabbit serum contains oxidizing substrates that compete with molecular oxygen for the acceptance of electrons from the oxidized enzyme. Consequently, future efforts should be aimed at elucidating the mechanisms involved in the interference of unknown serum components with electron transfer. In addition, further investigations have to be performed to develop an outer membrane that minimizes protein adsorption as well as the actions of inflammatory cells.
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Affiliation(s)
- M Gerritsen
- Department of Biomaterials, College of Dental Science, University of Nijmegen, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
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15
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Chen L, Hong JY, So E, Hussin AH, Cheng WF, Yang CS. Decrease of hepatic catalase level by treatment with diallyl sulfide and garlic homogenates in rats and mice. J Biochem Mol Toxicol 2000; 13:127-34. [PMID: 10098897 DOI: 10.1002/(sici)1099-0461(1999)13:3/4<127::aid-jbt2>3.0.co;2-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Diallyl sulfide (DAS) is a flavor compound derived from garlic and is active in the inhibition of chemically induced cytotoxicity and carcinogenicity in animal models. This study was conducted to examine the effects of the treatment of DAS and garlic homogenates on the activities of catalase, glutathione peroxidase, and superoxide dismutase. Male Sprague-Dawley rats were treated with DAS i.g. at daily doses of 50 or 200 mg/kg for 8 days, causing the hepatic catalase activity to decrease by 55 and 95%, respectively. Such a decrease in hepatic catalase activity was also observed when the DAS treatment was extended to 29 days. Western blot analysis showed that the DAS treatments resulted in corresponding decreases in the liver catalase protein level. No significant change in the catalase activity in the kidney, lung, and brain was observed with the treatments, but a slight decrease in heart catalase activity was observed. These treatments did not cause significant changes in superoxide dismutase and glutathione peroxidase activities in these tissues. Treatment with DAS at a daily dose of 200 mg/kg for 1-7 days resulted in a gradual decrease in the liver catalase activity to 5% of the control level, but it did not decrease the erythrocyte catalase activity. Treatment of rats with fresh garlic homogenates (2 or 4 g/kg, i.g., daily for 7 days) caused a 35% decrease in liver catalase activity. A/J mice treated with DAS and garlic homogenates also showed a decrease in the liver catalase activity. Diallyl sulfone (DASO2), a DAS metabolite, however, did not effectively decrease catalase activity in mice. The catalase activity was not inhibited by either DAS or DASO2 in vitro. The present results demonstrate that treatment with DAS and garlic homogenates decrease the hepatic catalase level in rats and mice.
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Affiliation(s)
- L Chen
- Laboratory for Cancer Research, College of Pharmacy, Rutgers University, Piscataway, NJ 08854, USA
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Shikama K. The Molecular Mechanism of Autoxidation for Myoglobin and Hemoglobin: A Venerable Puzzle. Chem Rev 1998; 98:1357-1374. [PMID: 11848936 DOI: 10.1021/cr970042e] [Citation(s) in RCA: 213] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Keiji Shikama
- Biological Institute, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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17
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van Eyk AD, Litthauer D, Oelofsen W. The isolation and partial characterization of catalase and a peroxidase active fraction from human white adipose tissue. THE INTERNATIONAL JOURNAL OF BIOCHEMISTRY 1992; 24:1101-9. [PMID: 1397503 DOI: 10.1016/0020-711x(92)90380-j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
1. A procedure is described for the purification of catalase and a peroxidase active fraction from human white adipose tissue. 2. Gel electrophoresis on SDS-PAGE revealed relative molecular masses of 202,900 and 208,600 for the active catalase and peroxidase molecules respectively (nonreducing conditions), as compared to 56,800 and 49,800 for the monomers under reducing conditions, thus indicating the likelihood of tetramers in the intact state. 3. The two purified enzymes differ with regard to pH optima (5-9 for catalase and 3 for peroxidase), temperature stability (up to 50 degrees C for catalase and 70 degrees C for peroxidase) and Km values towards H2O2 (38.9 mM for catalase and 7.69 mM for peroxidase, which was also active in oxidizing a number of o-dihydricphenols as second substrates). 4. The catalase enzyme showed uncompetitive inhibition by the irreversible inhibitor 3-amino-1,2,4-triazole (AT), Ki = 5.4 mM.
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Affiliation(s)
- A D van Eyk
- Department of Biochemistry, University of Port Elizabeth, South Africa
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18
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Levy E, Eyal Z, Hochman A. Purification and characterization of a catalase-peroxidase from the fungus Septoria tritici. Arch Biochem Biophys 1992; 296:321-7. [PMID: 1605641 DOI: 10.1016/0003-9861(92)90579-l] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Three classes of heme proteins, commonly designated hydroperoxidases, are involved in the metabolism of hydrogen peroxide: catalases, peroxidases, and catalase-peroxidases. While catalases and peroxidases are widely spread in animals, plants, and microorganisms, catalase-peroxidases were characterized only in prokaryotes. We report here, for the first time, on a catalase-peroxidase in a eukaryotic organism. The enzyme was purified from the fungal wheat pathogen Septoria tritici, and is one of three different hydroperoxidases synthesized by this organism. The S. tritici catalase-peroxidase, designated StCP, is similar to the enzymes previously isolated from the bacteria Rhodobacter capsulatus, Escherichia coli, and Klebsiella pneumoniae, although it is significantly more sensitive to denaturing conditions. In addition to its catalatic activity StCP catalyzes peroxidatic activity with o-dianisidine, diaminobenzidine, pyrogallol, NADH, and NADPH as electron donors. The enzyme is a tetramer with identical subunits of 61,000 Da molecular weight. StCP shows a typical high-spin ferric heme spectrum with a Soret band at 405 nm and a peak at 632 nm, and binding of cyanide causes a shift of the Soret band to 421 nm, the appearance of a peak at 537 nm, and abolition of the peak at 632 nm. Reduction with dithionite results in a decrease in the intensity of the Soret band and its shift to 436 nm, and in the appearance of a peak at 552 nm. The pH optimum is 6-6.5 and 5.4 for the catalatic and peroxidatic activities, respectively. Fifty percent of the apparent maximal activity is reached at 3.4 mM and 0.26 mM for the catalatic and peroxidatic activities, respectively. The enzyme is inactivated by ethanol/chloroform, and is inhibited by KCN and NaN3, but not by the typical catalase inhibitor 3-amino-1,2,4-triazole.
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Affiliation(s)
- E Levy
- Department of Botany, George S. Wise Faculty of Life Sciences, Tel-Aviv University, Israel 69978
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20
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Yamaguchi H, Hiratani T, Baba M, Osumi M. Effect of aculeacin A on reverting protoplasts of Candida albicans. Microbiol Immunol 1987; 31:625-38. [PMID: 3325782 DOI: 10.1111/j.1348-0421.1987.tb03123.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Protoplasts of Candida albicans were prepared by digestion with Zymolyase and the effect of aculeacin A, a wall-active antibiotic, on the synthesis of microfibrillar structures by the protoplasts incubated for 5 hr in an osmotically stabilized medium was studied using several electron microscopical techniques. Chemical analyses of the protoplasts before and after reversion with or without the antibiotic were also performed. Aculeacin A not only inhibited synthesis of microfibrils mainly composed of alkali-insoluble beta-glucan, but also their assembly to form thicker bundles. The antibiotic appeared to have no effect on other wall components constituting the surface structure of reverting protoplasts. These data confirmed our previous postulation that aculeacin A is a specific and potent inhibitor of beta-glucan synthesis as well as biogenesis of cell walls including beta-glucans in susceptible yeasts.
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Affiliation(s)
- H Yamaguchi
- Research Center for Medical Mycology, Teikyo University, Tokyo
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