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Salazar Marcano DE, Savić ND, Declerck K, Abdelhameed SAM, Parac-Vogt TN. Reactivity of metal-oxo clusters towards biomolecules: from discrete polyoxometalates to metal-organic frameworks. Chem Soc Rev 2024; 53:84-136. [PMID: 38015569 DOI: 10.1039/d3cs00195d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Metal-oxo clusters hold great potential in several fields such as catalysis, materials science, energy storage, medicine, and biotechnology. These nanoclusters of transition metals with oxygen-based ligands have also shown promising reactivity towards several classes of biomolecules, including proteins, nucleic acids, nucleotides, sugars, and lipids. This reactivity can be leveraged to address some of the most pressing challenges we face today, from fighting various diseases, such as cancer and viral infections, to the development of sustainable and environmentally friendly energy sources. For instance, metal-oxo clusters and related materials have been shown to be effective catalysts for biomass conversion into renewable fuels and platform chemicals. Furthermore, their reactivity towards biomolecules has also attracted interest in the development of inorganic drugs and bioanalytical tools. Additionally, the structural versatility of metal-oxo clusters allows for the efficiency and selectivity of the biomolecular reactions they promote to be readily tuned, thereby providing a pathway towards reaction optimization. The properties of the catalyst can also be improved through incorporation into solid supports or by linking metal-oxo clusters together to form Metal-Organic Frameworks (MOFs), which have been demonstrated to be powerful heterogeneous catalysts. Therefore, this review aims to provide a comprehensive and critical analysis of the state of the art on biomolecular transformations promoted by metal-oxo clusters and their applications, with a particular focus on structure-activity relationships.
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Affiliation(s)
| | - Nada D Savić
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.
| | - Kilian Declerck
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.
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Mamdouh AA, Ibrahim ABM, Reyad NEHA, Elsayed TR, Santos IC, Paulo A, Mahfouz RM. (NH4)2[Co(H2O)6]2V10O28·4H2O Vs. (NH4)2[Ni(H2O)6]2V10O28·4H2O: Structural, Spectral and Thermal Analyses and Evaluation of Their Antibacterial Activities. J CLUST SCI 2022. [DOI: 10.1007/s10876-022-02326-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AbstractThis paper presents the synthesis of two cluster compounds {(NH4)2[Co(H2O)6]2V10O28·4H2O (C1) and (NH4)2[Ni(H2O)6]2V10O28·4H2O (C2)} which were obtained as single crystals suitable for XRD analysis that revealed their crystallization in the monoclinic (C2/c) and triclinic (P-1) space groups, respectively. Additionally, C1 and C2 were characterized using CHN analysis and FT-IR spectroscopy and their thermal decomposition mechanisms were investigated. The antibacterial activities of both compounds were determined against three human pathogenic bacterial strains {Bacillus cereus ATCC 33,018, Escherichia coli O157:H7 and Pseudomonas aeruginosa ATCC 9027} and one phytopathogenic bacterial strain {Ralstonia solanacearum}, while drug standards {chloramphenicol and streptomycin} were used as control. The inhibitory activity and the minimum inhibitory concentration (MIC) values of the tested compounds clearly indicated higher antibacterial activities of the nickel compound against B. cereus ATCC 33,018, E. coli O157 and R. solanacearum with MIC values of 3.150, 3.150 and 6.300 mg/ml, respectively. On the other hand, (NH4)2[Co(H2O)6]2V10O28·4H2O exhibited higher antibacterial activity against P. aeruginosa ATCC 9027 (MIC value of 6.300 mg/ml) in comparison to the nickel analog. In general, the measured activities are lower than that obtained for the standards except for the higher activity given by C2 in comparison to streptomycin against the R. solanacearum strain.
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3
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Monoclinic- vs. triclinic-(NH4)2[Mg(H2O)6]2V10O28∙4H2O: Structural studies and variation in antibacterial activities with the polymorph type. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mahmoud GA, Ibrahim ABM, Mayer P. (NH
4
)
2
[Ni(H
2
O)
6
]
2
V
10
O
28
⋅ 4H
2
O; Structural Analysis and Bactericidal Activity against Pathogenic Gram Negative Bacteria. ChemistrySelect 2021. [DOI: 10.1002/slct.202100006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Ahmed B. M. Ibrahim
- Department of Chemistry Faculty of Science Assiut University Assiut 71516 Egypt
| | - Peter Mayer
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstr. 5–13, Haus D 81377 München Germany
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Fraqueza G, Fuentes J, Krivosudský L, Dutta S, Mal SS, Roller A, Giester G, Rompel A, Aureliano M. Inhibition of Na +/K +- and Ca 2+-ATPase activities by phosphotetradecavanadate. J Inorg Biochem 2019; 197:110700. [PMID: 31075720 DOI: 10.1016/j.jinorgbio.2019.110700] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 04/16/2019] [Accepted: 04/25/2019] [Indexed: 02/07/2023]
Abstract
Polyoxometalates (POMs) are promising inorganic inhibitors for P-type ATPases. The experimental models used to study the effects of POMs on these ATPases are usually in vitro models using vesicles from several membrane sources. Very recently, some polyoxotungstates, such as the Dawson anion [P2W18O62]6-, were shown to be potent P-type ATPase inhibitors; being active in vitro as well as in ex-vivo. In the present study we broaden the spectrum of highly active inhibitors of Na+/K+-ATPase from basal membrane of epithelial skin to the bi-capped Keggin-type anion phosphotetradecavanadate Cs5.6H3.4PV14O42 (PV14) and we confront the data with activity of other commonly encountered polyoxovanadates, decavanadate (V10) and monovanadate (V1). The X-ray crystal structure of PV14 was solved and contains two trans-bicapped α-Keggin anions HxPV14O42(9-x)-. The anion is built up from the classical Keggin structure [(PO4)@(V12O36)] capped by two [VO] units. PV14 (10 μM) exhibited higher ex-vivo inhibitory effect on Na+/K+-ATPase (78%) than was observed at the same concentrations of V10 (66%) or V1 (33%). Moreover, PV14 is also a potent in vitro inhibitor of the Ca2+-ATPase activity (IC50 5 μM) exhibiting stronger inhibition than the previously reported activities for V10 (15 μM) and V1 (80 μM). Putting it all together, when compared both P-typye ATPases it is suggested that PV14 exibited a high potential to act as an in vivo inhibitor of the Na+/K+-ATPase associated with chloride secretion.
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Affiliation(s)
- Gil Fraqueza
- ISE, University of Algarve, 8005-139 Faro, Portugal; CCMar, University of Algarve, 8005-139 Faro, Portugal
| | - Juan Fuentes
- CCMar, University of Algarve, 8005-139 Faro, Portugal
| | - Lukáš Krivosudský
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstr. 14, 1090 Wien, Austria; Comenius University, Faculty of Natural Sciences, Department of Inorganic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Saikat Dutta
- Department of Chemistry, National Institute of Technology Karnataka, Mangalore 575025, Karnataka, India
| | - Sib Sankar Mal
- Department of Chemistry, National Institute of Technology Karnataka, Mangalore 575025, Karnataka, India.
| | - Alexander Roller
- Universität Wien, Fakultät für Chemie, Zentrum für Röntgenstrukturanalyse, 1090 Wien, Austria
| | - Gerald Giester
- Universität Wien, Fakultät für Geowissenschaften, Geographie und Astronomie, Institut für Mineralogie und Kristallographie, 1090 Wien, Austria
| | - Annette Rompel
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstr. 14, 1090 Wien, Austria.
| | - Manuel Aureliano
- CCMar, University of Algarve, 8005-139 Faro, Portugal; FCT, University of Algarve, 8005-139 Faro, Portugal.
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Marques-da-Silva D, Fraqueza G, Lagoa R, Vannathan AA, Mal SS, Aureliano M. Polyoxovanadate inhibition of Escherichia coli growth shows a reverse correlation with Ca2+-ATPase inhibition. NEW J CHEM 2019. [DOI: 10.1039/c9nj01208g] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Polyoxovanadates were recently found to be the most active among a series of polyoxometalates against bacteria. In this study, a reverse correlation was found between the Ca2+-ATPase IC50 and the E. Coli GI50 values.
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Affiliation(s)
- Dorinda Marques-da-Silva
- ESTG, Polytechnic Institute of Leiria
- Portugal
- UCIBIO, Faculty of Science and Technology
- University NOVA of Lisbon
- Portugal
| | - Gil Fraqueza
- ISE, University of Algarve
- 8005-139 Faro
- Portugal
- CCMar, University of Algarve
- 8005-139 Faro
| | - Ricardo Lagoa
- ESTG, Polytechnic Institute of Leiria
- Portugal
- UCIBIO, Faculty of Science and Technology
- University NOVA of Lisbon
- Portugal
| | | | - Sib Sankar Mal
- Department of Chemistry
- National Institute of Technology Karnataka
- Mangalore 575025
- India
| | - Manuel Aureliano
- CCMar, University of Algarve
- 8005-139 Faro
- Portugal
- FCT
- University of Algarve
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Gumerova N, Krivosudský L, Fraqueza G, Breibeck J, Al-Sayed E, Tanuhadi E, Bijelic A, Fuentes J, Aureliano M, Rompel A. The P-type ATPase inhibiting potential of polyoxotungstates. Metallomics 2018; 10:287-295. [PMID: 29313547 PMCID: PMC5824666 DOI: 10.1039/c7mt00279c] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 11/30/2017] [Indexed: 02/05/2023]
Abstract
Polyoxometalates (POMs) are transition metal complexes that exhibit a broad diversity of structures and properties rendering them promising for biological purposes. POMs are able to inhibit a series of biologically important enzymes, including phosphatases, and thus are able to affect many biochemical processes. In the present study, we analyzed and compared the inhibitory effects of nine different polyoxotungstates (POTs) on two P-type ATPases, Ca2+-ATPase from skeletal muscle and Na+/K+-ATPase from basal membrane of skin epithelia. For Ca2+-ATPase inhibition, an in vitro study was performed and the strongest inhibitors were determined to be the large heteropolytungstate K9(C2H8N)5[H10Se2W29O103] (Se2W29) and the Dawson-type POT K6[α-P2W18O62] (P2W18) exhibiting IC50 values of 0.3 and 0.6 μM, respectively. Promising results were also shown for the Keggin-based POTs K6H2[CoW11TiO40] (CoW11Ti, IC50 = 4 μM) and Na10[α-SiW9O34] (SiW9, IC50 = 16 μM), K14[As2W19O67(H2O)] (As2W19, IC50 = 28 μM) and the lacunary Dawson K12[α-H2P2W12O48] (P2W12, IC50 = 11 μM), whereas low inhibitory potencies were observed for the isopolytungstate Na12[H4W22O74] (W22, IC50 = 68 μM) and the Anderson-type Na6[TeW6O24] (TeW6, IC50 = 200 μM). Regarding the inhibition of Na+/K+-ATPase activity, for the first time an ex vivo study was conducted using the opercular epithelium of killifish in order to investigate the effects of POTs on the epithelial chloride secretion. Interestingly, 1 μM of the most potent Ca2+-ATPase inhibitor, Se2W29, showed only a minor inhibitory effect (14% inhibition) on Na+/K+-ATPase activity, whereas almost total inhibition (99% inhibition) was achieved using P2W18. The remaining POTs exhibited similar inhibition rates on both ATPases. These results reveal the high potential of some POTs to act as P-type ATPase inhibitors, with Se2W29 showing high selectivity towards Ca2+-ATPase.
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Affiliation(s)
- Nadiia Gumerova
- Universität Wien , Fakultät für Chemie , Institut für Biophysikalische Chemie , Althanstraße. 14 , 1090 Wien , Austria . ; www.bpc.univie.ac.at
| | - Lukáš Krivosudský
- Universität Wien , Fakultät für Chemie , Institut für Biophysikalische Chemie , Althanstraße. 14 , 1090 Wien , Austria . ; www.bpc.univie.ac.at
| | - Gil Fraqueza
- Centre of Marine Sciences , University of Algarve , 8005-139 Faro , Portugal
- Institute of Engineering , University of Algarve , 8005-139 Faro , Portugal
| | - Joscha Breibeck
- Universität Wien , Fakultät für Chemie , Institut für Biophysikalische Chemie , Althanstraße. 14 , 1090 Wien , Austria . ; www.bpc.univie.ac.at
| | - Emir Al-Sayed
- Universität Wien , Fakultät für Chemie , Institut für Biophysikalische Chemie , Althanstraße. 14 , 1090 Wien , Austria . ; www.bpc.univie.ac.at
| | - Elias Tanuhadi
- Universität Wien , Fakultät für Chemie , Institut für Biophysikalische Chemie , Althanstraße. 14 , 1090 Wien , Austria . ; www.bpc.univie.ac.at
| | - Aleksandar Bijelic
- Universität Wien , Fakultät für Chemie , Institut für Biophysikalische Chemie , Althanstraße. 14 , 1090 Wien , Austria . ; www.bpc.univie.ac.at
| | - Juan Fuentes
- Centre of Marine Sciences , University of Algarve , 8005-139 Faro , Portugal
| | - Manuel Aureliano
- Centre of Marine Sciences , University of Algarve , 8005-139 Faro , Portugal
- Faculty of Sciences and Technology , University of Algarve , 8005-139 Faro , Portugal .
| | - Annette Rompel
- Universität Wien , Fakultät für Chemie , Institut für Biophysikalische Chemie , Althanstraße. 14 , 1090 Wien , Austria . ; www.bpc.univie.ac.at
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8
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Marques MPM, Gianolio D, Ramos S, Batista de Carvalho LAE, Aureliano M. An EXAFS Approach to the Study of Polyoxometalate-Protein Interactions: The Case of Decavanadate-Actin. Inorg Chem 2017; 56:10893-10903. [PMID: 28858484 DOI: 10.1021/acs.inorgchem.7b01018] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
EXAFS and XANES experiments were used to assess decavanadate interplay with actin, in both the globular and polymerized forms, under different conditions of pH, temperature, ionic strength, and presence of ATP. This approach allowed us to simultaneously probe, for the first time, all vanadium species present in the system. It was established that decavanadate interacts with G-actin, triggering a protein conformational reorientation that induces oxidation of the cysteine core residues and oxidovanadium (VIV) formation. The local environment of vanadium's absorbing center in the [decavanadate-protein] adducts was determined, a V-SCys coordination having been verified experimentally. The variations induced in decavanadate's EXAFS profile by the presence of actin were found to be almost totally reversed by the addition of ATP, which constitutes a solid proof of decavanadate interaction with the protein at its ATP binding site. Additionally, a weak decavanadate interplay with F-actin was suggested to take place, through a mechanism different from that inferred for globular actin. These findings have important consequences for the understanding, at a molecular level, of the significant biological activities of decavanadate and similar polyoxometalates, aiming at potential pharmacological applications.
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Affiliation(s)
- M Paula M Marques
- "Química-Física Molecular" R&D Unit, Department of Chemistry, University of Coimbra , 3004-535 Coimbra, Portugal
- Department of Life Sciences, University of Coimbra , 3000-456 Coimbra, Portugal
| | - Diego Gianolio
- Diamond Light Source, Harwell Science & Innovation Campus , Didcot OX11 0DE, United Kingdom
| | - Susana Ramos
- UCIBIO, REQUIMTE, Departamento de Química, Universidade Nova de Lisboa , 2829-516 Caparica, Portugal
| | - Luís A E Batista de Carvalho
- "Química-Física Molecular" R&D Unit, Department of Chemistry, University of Coimbra , 3004-535 Coimbra, Portugal
| | - Manuel Aureliano
- "Química-Física Molecular" R&D Unit, Department of Chemistry, University of Coimbra , 3004-535 Coimbra, Portugal
- FCT and CCmar, University of Algarve , 8005-139 Faro, Portugal
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Clausen JD, Bublitz M, Arnou B, Olesen C, Andersen JP, Møller JV, Nissen P. Crystal Structure of the Vanadate-Inhibited Ca(2+)-ATPase. Structure 2016; 24:617-623. [PMID: 27050689 DOI: 10.1016/j.str.2016.02.018] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Revised: 02/09/2016] [Accepted: 02/25/2016] [Indexed: 11/25/2022]
Abstract
Vanadate is the hallmark inhibitor of the P-type ATPase family; however, structural details of its inhibitory mechanism have remained unresolved. We have determined the crystal structure of sarcoplasmic reticulum Ca(2+)-ATPase with bound vanadate in the absence of Ca(2+). Vanadate is bound at the catalytic site as a planar VO3(-) in complex with water and Mg(2+) in a dephosphorylation transition-state-like conformation. Validating bound VO3(-) by anomalous difference Fourier maps using long-wavelength data we also identify a hitherto undescribed Cl(-) site near the dephosphorylation site. Crystallization was facilitated by trinitrophenyl (TNP)-derivatized nucleotides that bind with the TNP moiety occupying the binding pocket that normally accommodates the adenine of ATP, rationalizing their remarkably high affinity for E2P-like conformations of the Ca(2+)-ATPase. A comparison of the configurations of bound nucleotide analogs in the E2·VO3(-) structure with that in E2·BeF3(-) (E2P ground state analog) reveals multiple binding modes to the Ca(2+)-ATPase.
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Affiliation(s)
- Johannes D Clausen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark; Department of Biomedicine, Aarhus University, 8000 Aarhus, Denmark
| | - Maike Bublitz
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark
| | - Bertrand Arnou
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark
| | - Claus Olesen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark; Department of Biomedicine, Aarhus University, 8000 Aarhus, Denmark
| | | | - Jesper Vuust Møller
- Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark; Department of Biomedicine, Aarhus University, 8000 Aarhus, Denmark
| | - Poul Nissen
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Centre for Membrane Pumps in Cells and Disease - PUMPKIN, Danish National Research Foundation, Aarhus University, 8000 Aarhus, Denmark; Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, 8000 Aarhus, Denmark.
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Aureliano M. Decavanadate Toxicology and Pharmacological Activities: V10 or V1, Both or None? OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:6103457. [PMID: 26904166 PMCID: PMC4745863 DOI: 10.1155/2016/6103457] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Accepted: 12/24/2015] [Indexed: 02/07/2023]
Abstract
This review covers recent advances in the understanding of decavanadate toxicology and pharmacological applications. Toxicological in vivo studies point out that V10 induces several changes in several oxidative stress parameters, different from the ones observed for vanadate (V1). In in vitro studies with mitochondria, a particularly potent V10 effect, in comparison with V1, was observed in the mitochondrial depolarization (IC50 = 40 nM) and oxygen consumption (99 nM). It is suggested that mitochondrial membrane depolarization is a key event in decavanadate induction of necrotic cardiomyocytes death. Furthermore, only decavanadate species and not V1 potently inhibited myosin ATPase activity stimulated by actin (IC50 = 0.75 μM) whereas exhibiting lower inhibition activities for Ca(2+)-ATPase activity (15 μM) and actin polymerization (17 μM). Because both calcium pump and actin decavanadate interactions lead to its stabilization, it is likely that V10 interacts at specific locations with these proteins that protect against hydrolysis but, on the other hand, it may induce V10 reduction to oxidovanadium(IV). Putting it all together, it is suggested that the pharmacological applications of V10 species and compounds whose mechanism of action is still to be clarified might involve besides V10 and V1 also vanadium(IV) species.
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Affiliation(s)
- M. Aureliano
- 1Faculty of Sciences and Technology, University of Algarve, Campus of Gambelas, 8005-135 Faro, Portugal
- 2CCMar (Centre of Marine Sciences), University of Algarve, Campus of Gambelas, 8005-135 Faro, Portugal
- *M. Aureliano:
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11
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Camacho FG, Alves WA. Using IR and Raman spectra to explain the catalytic activity of the Fe(II)/Fe(III) pair toward the cleavage of peptide bonds. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 151:11-15. [PMID: 26117195 DOI: 10.1016/j.saa.2015.06.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 06/11/2015] [Indexed: 06/04/2023]
Abstract
IR and Raman experiments of formamide (FA) solutions containing variable amounts of Fe(II) and Fe(III) salts were carried out. The νCO vibration is downshifted whereas the νCN mode is upshifted in the presence of the divalent ion. As the trivalent ion is added to the solvent, upshifts of both νCO and νCN vibrations are observed. These spectral patterns are related to the distinct FA forms that are stabilized by each ion. Fe(II) is surrounded by 6 ionic FA species while neutral ones coordinate to the trivalent ion with formation of [Fe(FA)3Cl](2+) and [Fe(FA)2(Cl)2](+). In higher salt compositions [FeCl4](-) is also identified in the spectra. Our vibrational results are very well corroborated by biological studies on the catalytic activity of the Fe(II)/Fe(III) pair in oxidative cleavage processes of polypeptides and proteins.
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Affiliation(s)
- Felipe G Camacho
- Departamento de Química Inorgânica, Instituto de Química, Universidade Federal do Rio de Janeiro, Caixa Postal 68563, Rio de Janeiro, RJ 21941-909, Brazil
| | - Wagner A Alves
- Departamento de Química Inorgânica, Instituto de Química, Universidade Federal do Rio de Janeiro, Caixa Postal 68563, Rio de Janeiro, RJ 21941-909, Brazil.
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Abstract
Site-selective peptide/protein degradation through chemical cleavage methods is an important modification of biologically relevant macromolecules which complements enzymatic hydrolysis. In this review, recent progress in chemical, site-selective peptide bond cleavage is overviewed, with an emphasis on postulated mechanisms and their implications on reactivity, selectivity, and substrate scope.
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Aureliano M. Decavanadate contribution to vanadium biochemistry: In vitro and in vivo studies. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2013.10.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Aureliano M, Ohlin CA. Decavanadate in vitro and in vivo effects: facts and opinions. J Inorg Biochem 2014; 137:123-30. [PMID: 24865633 DOI: 10.1016/j.jinorgbio.2014.05.002] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2014] [Revised: 05/03/2014] [Accepted: 05/03/2014] [Indexed: 02/07/2023]
Abstract
This review covers recent advances in the understanding of the in vitro and in vivo effects of decavanadate, (V10O28)(6-), particularly in mitochondria. In vivo toxicological studies involving vanadium rarely account for the fact that under physiological conditions some vanadium may be present in the form of the decavanadate ion, which may behave differently from ortho- and metavanadates. It has for example been demonstrated that vanadium levels in heart or liver mitochondria are increased upon decavanadate exposure. Additionally, in vitro studies have shown that mitochondrial depolarization (IC50, 40 nM) and oxygen consumption (IC50, 99 nM) are strongly affected by decavanadate, which causes reduction of cytochrome b (complex III). We review these recent findings which together suggest that the observed cellular targets, metabolic pathway and toxicological effects differ according to the species of vanadium present. Finally, the toxicological effects of decavanadate depend on several factors such as the mode of administration, exposure time and type of tissue.
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Affiliation(s)
- M Aureliano
- DCBB, Faculty of Sciences and Technology, University of Algarve, Campus de Gambelas, 8005-135 Faro, Portugal; CCMar, University of Algarve, Campus de Gambelas, 8005-135 Faro, Portugal.
| | - C André Ohlin
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
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Stroobants K, Ho PH, Moelants E, Proost P, Parac-Vogt TN. Selective hydrolysis of hen egg white lysozyme at Asp-X peptide bonds promoted by oxomolybdate. J Inorg Biochem 2014; 136:73-80. [DOI: 10.1016/j.jinorgbio.2014.03.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Revised: 03/11/2014] [Accepted: 03/11/2014] [Indexed: 10/25/2022]
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Kerek F, Voicu VA. Spherical Oligo-Silicic Acid SOSA Disclosed as Possible Endogenous Digitalis-Like Factor. Front Endocrinol (Lausanne) 2014; 5:233. [PMID: 25667581 PMCID: PMC4304351 DOI: 10.3389/fendo.2014.00233] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 12/16/2014] [Indexed: 11/15/2022] Open
Abstract
The Na(+)/K(+)-ATPase is a membrane ion-transporter protein, specifically inhibited by digitalis glycosides used in cardiac therapy. The existence in mammals of some endogenous digitalis-like factors (EDLFs) as presumed ATPase ligands is generally accepted. But the chemical structure of these factors remained elusive because no weighable amounts of pure EDLFs have been isolated. Recent high-resolution crystal structure data of Na(+)/K(+)-ATPase have located the hydrophobic binding pocket of the steroid glycoside ouabain. It remained uncertain if the EDLF are targeting this steroid-receptor or another specific binding site(s). Our recently disclosed spherical oligo-silicic acids (SOSA) fulfill the main criteria to be identified with the presumed EDL factors. SOSA was found as a very potent inhibitor of the Na(+)/K(+)-ATPase, Ca(2+)-ATPase, H(+)/K(+)-ATPase, and of K-dp-ATPase, with IC50 values between 0.2 and 0.5 μg/mL. These findings are even more astonishing while so far, neither monosilicic acid nor its poly-condensed forms have been remarked biologically active. With the diameter ϕ between 1 and 3 nm, SOSA still belong to molecular species definitely smaller than silica nano-particles with ϕ > 5 nm. In SOSA molecules, almost all Si-OH bonds are displayed on the external shell, which facilitates the binding to hydrophilic ATPase domains. SOSA is stable for long term in solution but is sensitive to freeze-drying, which could explain the failure of countless attempts to isolate pure EDLF. There is a strong resemblance between SOSA and vanadates, the previously known general inhibitors of P-type ATPases. SOSA may be generated endogenously by spherical oligomerization of the ubiquitously present monosilicic acid in animal fluids. The structure of SOSA is sensitive to the concentration of Na(+), K(+), Ca(2+), Mg(2+), and other ions suggesting a presumably archaic mechanism for the regulation of the ATPase pumps.
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Affiliation(s)
- Franz Kerek
- SiNatur GmbH, Martinsried, Germany
- *Correspondence: Franz Kerek, SiNatur GmbH, Am Klopferspitz 19, IZB, 82152 Munich, Germany e-mail:
| | - Victor A. Voicu
- Department of Clinical Pharmacology, Toxicology and Psychopharmacology, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
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Al-Qatati A, Fontes FL, Barisas BG, Zhang D, Roess DA, Crans DC. Raft localization of type I Fcε receptor and degranulation of RBL-2H3 cells exposed to decavanadate, a structural model for V2O5. Dalton Trans 2013; 42:11912-20. [PMID: 23861175 DOI: 10.1039/c3dt50398d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Vanadium oxides (VOs) have been identified as low molecular weight sensitizing agents associated with occupational asthma and compromised pulmonary immunocompetence. Symptoms of adult onset asthma result, in part, from increased signal transduction by Type I Fcε receptors (FcεRI) leading to release of vasoactive compounds including histamine from mast cells. Exposure to (VOs) typically occurs in the form of particles which are insoluble. Upon contact with water or biological fluids, (VOs) form a series of soluble oxoanions, one of which is decavanadate, V10O28(6-) abbreviated V10, which is structurally related to a common vanadium oxide, that is vanadium pentoxide, V2O5. Here we investigate whether V10 may be initiating plasma membrane events associated with activation of FcεRI signal transduction. We show that exposure of RBL-2H3 cells to V10 causes a concentration-dependent increase in degranulation of RBL-2H3 and, in addition, an increase in plasma membrane lipid packing as measured by the fluorescent probe, di-4-ANEPPDHQ. V10 also increases FcεRI accumulation in low-density membrane fragments, i.e., lipid rafts, which may facilitate FcεRI signaling. To determine whether V10 effects on plasma membrane lipid packing were similarly observed in Langmuir monolayers formed from dipalmitoylphosphatidylcholine (DPPC), the extent of lipid packing in the presence and absence of V10 and vanadate was compared. V10 increased the surface area of DPPC Langmuir monolayers by 6% and vanadate decreased the surface area by 4%. These results are consistent with V10 interacting with this class of membrane lipids and altering DPPC packing.
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Affiliation(s)
- Abeer Al-Qatati
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, Colorado 80523, USA
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Fraqueza G, Batista de Carvalho LAE, Marques MPM, Maia L, Ohlin CA, Casey WH, Aureliano M. Decavanadate, decaniobate, tungstate and molybdate interactions with sarcoplasmic reticulum Ca(2+)-ATPase: quercetin prevents cysteine oxidation by vanadate but does not reverse ATPase inhibition. Dalton Trans 2012; 41:12749-58. [PMID: 22968713 DOI: 10.1039/c2dt31688a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Recently we demonstrated that the decavanadate (V(10)) ion is a stronger Ca(2+)-ATPase inhibitor than other oxometalates, such as the isoelectronic and isostructural decaniobate ion, and the tungstate and molybdate monomer ions, and that it binds to this protein with a 1 : 1 stoichiometry. The V(10) interaction is not affected by any of the protein conformations that occur during the process of calcium translocation (i.e. E1, E1P, E2 and E2P) (Fraqueza et al., J. Inorg. Biochem., 2012). In the present study, we further explore this subject, and we can now show that the decaniobate ion, [Nb(10) = Nb(10)O(28)](6-), is a useful tool in deducing the interaction and the non-competitive Ca(2+)-ATPase inhibition by the decavanadate ion [V(10) = V(10)O(28)](6-). Moreover, decavanadate and vanadate induce protein cysteine oxidation whereas no effects were detected for the decaniobate, tungstate or molybdate ions. The presence of the antioxidant quercetin prevents cysteine oxidation, but not ATPase inhibition, by vanadate or decavanadate. Definitive V(IV) EPR spectra were observed for decavanadate in the presence of sarcoplasmic reticulum Ca(2+)-ATPase, indicating a vanadate reduction at some stage of the protein interaction. Raman spectroscopy clearly shows that the protein conformation changes that are induced by V(10), Nb(10) and vanadate are different from the ones induced by molybdate and tungstate monomer ions. Here, Mo and W cause changes similar to those by phosphate, yielding changes similar to the E1P protein conformation. The putative reduction of vanadium(V) to vanadium(IV) and the non-competitive binding of the V(10) and Nb(10) decametalates may explain the differences in the Raman spectra compared to those seen in the presence of molybdate or tungstate. Putting it all together, we suggest that the ability of V(10) to inhibit the Ca(2+)-ATPase may be at least in part due to the process of vanadate reduction and associated protein cysteine oxidation. These results contribute to the understanding and application of these families of mono- and polyoxometalates as effective modulators of many biological processes, particularly those associated with calcium homeostasis.
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Affiliation(s)
- Gil Fraqueza
- ISE and CCmar, University of Algarve, 8005-139 Faro, Portugal
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19
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Fraqueza G, Ohlin CA, Casey WH, Aureliano M. Sarcoplasmic reticulum calcium ATPase interactions with decaniobate, decavanadate, vanadate, tungstate and molybdate. J Inorg Biochem 2012; 107:82-9. [PMID: 22178669 DOI: 10.1016/j.jinorgbio.2011.10.010] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 10/08/2011] [Accepted: 10/20/2011] [Indexed: 02/07/2023]
Abstract
Over the last few decades there has been increasing interest in oxometalate and polyoxometalate applications to medicine and pharmacology. This interest arose, at least in part, due to the properties of these classes of compounds as anti-cancer, anti-diabetic agents, and also for treatment of neurodegenerative diseases, among others. However, our understanding of the mechanism of action would be improved if biological models could be used to clarify potential toxicological effects in main cellular processes. Sarcoplasmic reticulum (SR) vesicles, containing a large amount of Ca(2+)-ATPase, an enzyme that accumulates calcium by active transport using ATP, have been suggested as a useful model to study the effects of oxometalates on calcium homeostasis. In the present article, it is shown that decavanadate, decaniobate, vanadate, tungstate and molybdate, all inhibited SR Ca(2+)-ATPase, with the following IC(50) values: 15, 35, 50, 400 μM and 45 mM, respectively. Decaniobate (Nb(10)), is the strongest P-type enzyme inhibitor, after decavanadate (V(10)). Atomic-absorption spectroscopy (AAS) analysis, indicates that decavanadate binds to the protein with a 1:1 decavanadate:Ca(2+)-ATPase stoichiometry. Furthermore, V(10) binds with similar extension to all the protein conformations, which occur during calcium translocation by active transport, namely E1, E1P, E2 and E2P, as analysed by AAS. In contrast, it was confirmed that the binding of monomeric vanadate (H(2)VO(4)(2-); V(1)) to the calcium pump is favoured only for the E2 and E2P conformations of the ATPase, whereas no significant amount of vanadate is bound to the E1 and E1P conformations. Scatchard plot analysis, confirmed a 1:1 ratio for decavanadate-Ca(2+)-ATPase, with a dissociation constant, k(d) of 1 μM(-1). The interaction of decavanadate V(10)O(28)(6-) (V(10)) with Ca(2+)-ATPase is prevented by the isostructural and isoelectronic decaniobate Nb(10)O(28)(6-) (Nb(10)), whereas no significant effects were detected with ATP or with heparin, a known competitive ATP binding molecule, suggesting that V(10) binds non-competitively, with respect to ATP, to the protein. Finally, it was shown that decaniobate inhibits SR Ca(2+)-ATPase activity in a non competitive type of inhibition, with respect to ATP. Taken together, these data demonstrate that decameric niobate and vanadate species are stronger inhibitors of the SR calcium ATPase than simple monomeric vanadate, tungstate and molybdate oxometalates, thus affecting calcium homeostasis, cell signalling and cell bioenergetics, as well many other cellular processes. The ability of these oxometalates to act either as phosphate analogues, as a transition-state analogue in enzyme-catalysed phosphoryl group transfer processes and as potentially nucleotide-dependent enzymes modulators or inhibitors, suggests that different oxometalates may reveal different mechanistic preferences in these classes of enzymes.
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Affiliation(s)
- Gil Fraqueza
- Department of Food Engineering, ISE, University of Algarve, 8005-139 Faro, Portugal
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Ho PH, Stroobants K, Parac-Vogt TN. Hydrolysis of Serine-Containing Peptides at Neutral pH Promoted by [MoO4]2– Oxyanion. Inorg Chem 2011; 50:12025-33. [DOI: 10.1021/ic2015034] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Phuong Hien Ho
- Katholieke Universiteit Leuven, Department of Chemistry, Celestijnenlaan
200F, B-3001, Leuven, Belgium
| | - Karen Stroobants
- Katholieke Universiteit Leuven, Department of Chemistry, Celestijnenlaan
200F, B-3001, Leuven, Belgium
| | - Tatjana N. Parac-Vogt
- Katholieke Universiteit Leuven, Department of Chemistry, Celestijnenlaan
200F, B-3001, Leuven, Belgium
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21
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Truflandier LA, Boucher F, Payen C, Hajjar R, Millot Y, Bonhomme C, Steunou N. DFT-NMR Investigation and 51V 3QMAS Experiments for Probing Surface OH Ligands and the Hydrogen-Bond Network in a Polyoxovanadate Cluster: The Case of Cs4[H2V10O28]·4H2O. J Am Chem Soc 2010; 132:4653-68. [DOI: 10.1021/ja908973y] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Lionel A. Truflandier
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, UMR CNRS 6502, 2 rue de la Houssinière, BP 32229, 44340 Nantes Cedex 3, France, Laboratoire des Systèmes Interfaciaux à l’Echelle Nanométrique (SIEN), UMR CNRS 7142, UPMC Univ Paris 06, 4 place Jussieu, 75252 Paris Cedex 05, France, and Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), UMR CNRS 7574, UPMC Univ Paris 06, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Florent Boucher
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, UMR CNRS 6502, 2 rue de la Houssinière, BP 32229, 44340 Nantes Cedex 3, France, Laboratoire des Systèmes Interfaciaux à l’Echelle Nanométrique (SIEN), UMR CNRS 7142, UPMC Univ Paris 06, 4 place Jussieu, 75252 Paris Cedex 05, France, and Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), UMR CNRS 7574, UPMC Univ Paris 06, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Christophe Payen
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, UMR CNRS 6502, 2 rue de la Houssinière, BP 32229, 44340 Nantes Cedex 3, France, Laboratoire des Systèmes Interfaciaux à l’Echelle Nanométrique (SIEN), UMR CNRS 7142, UPMC Univ Paris 06, 4 place Jussieu, 75252 Paris Cedex 05, France, and Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), UMR CNRS 7574, UPMC Univ Paris 06, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Redouane Hajjar
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, UMR CNRS 6502, 2 rue de la Houssinière, BP 32229, 44340 Nantes Cedex 3, France, Laboratoire des Systèmes Interfaciaux à l’Echelle Nanométrique (SIEN), UMR CNRS 7142, UPMC Univ Paris 06, 4 place Jussieu, 75252 Paris Cedex 05, France, and Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), UMR CNRS 7574, UPMC Univ Paris 06, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Yannick Millot
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, UMR CNRS 6502, 2 rue de la Houssinière, BP 32229, 44340 Nantes Cedex 3, France, Laboratoire des Systèmes Interfaciaux à l’Echelle Nanométrique (SIEN), UMR CNRS 7142, UPMC Univ Paris 06, 4 place Jussieu, 75252 Paris Cedex 05, France, and Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), UMR CNRS 7574, UPMC Univ Paris 06, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Christian Bonhomme
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, UMR CNRS 6502, 2 rue de la Houssinière, BP 32229, 44340 Nantes Cedex 3, France, Laboratoire des Systèmes Interfaciaux à l’Echelle Nanométrique (SIEN), UMR CNRS 7142, UPMC Univ Paris 06, 4 place Jussieu, 75252 Paris Cedex 05, France, and Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), UMR CNRS 7574, UPMC Univ Paris 06, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Nathalie Steunou
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, UMR CNRS 6502, 2 rue de la Houssinière, BP 32229, 44340 Nantes Cedex 3, France, Laboratoire des Systèmes Interfaciaux à l’Echelle Nanométrique (SIEN), UMR CNRS 7142, UPMC Univ Paris 06, 4 place Jussieu, 75252 Paris Cedex 05, France, and Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), UMR CNRS 7574, UPMC Univ Paris 06, Collège de France, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
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Bošnjaković-Pavlović N, Spasojević-de Biré A, Tomaz I, Bouhmaida N, Avecilla F, Mioč UB, Pessoa JC, Ghermani NE. Electronic Properties of a Cytosine Decavanadate: Toward a Better Understanding of Chemical and Biological Properties of Decavanadates. Inorg Chem 2009; 48:9742-53. [DOI: 10.1021/ic9008575] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nada Bošnjaković-Pavlović
- Laboratoire Structures, Propriétés et Modélisation des Solides (SPMS), UMR CNRS 8580, Ecole Centrale Paris, Grande Voie des Vignes, 92295 Châtenay-Malabry, France
- Faculty of Physical Chemistry, University of Belgrade, P.O. Box 47, 11158 Belgrade, PAC 105305, Serbia
| | - Anne Spasojević-de Biré
- Laboratoire Structures, Propriétés et Modélisation des Solides (SPMS), UMR CNRS 8580, Ecole Centrale Paris, Grande Voie des Vignes, 92295 Châtenay-Malabry, France
| | - Isabel Tomaz
- Centro de Quimica Estrutural, Instituto Superior Tecnico, TU Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Nouzha Bouhmaida
- Laboratoire des Sciences des Matériaux (LSM) Université Cadi Ayyad, Faculté des Sciences Semlalia, Boulevard Prince Moulay Abdallah, BP 2390, 40000 Marrakech, Morocco
| | - Fernando Avecilla
- Departamento de Química Fundamental, Facultad de Ciencias, Universidade da Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain
| | - Ubavka B. Mioč
- Faculty of Physical Chemistry, University of Belgrade, P.O. Box 47, 11158 Belgrade, PAC 105305, Serbia
| | - João Costa Pessoa
- Centro de Quimica Estrutural, Instituto Superior Tecnico, TU Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Nour Eddine Ghermani
- Laboratoire Structures, Propriétés et Modélisation des Solides (SPMS), UMR CNRS 8580, Ecole Centrale Paris, Grande Voie des Vignes, 92295 Châtenay-Malabry, France
- Laboratoire de Physique Pharmaceutique, UMR CNRS 8612, Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry, France
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Aureliano M, Crans DC. Decavanadate (V10 O28 6-) and oxovanadates: oxometalates with many biological activities. J Inorg Biochem 2009; 103:536-46. [PMID: 19110314 DOI: 10.1016/j.jinorgbio.2008.11.010] [Citation(s) in RCA: 190] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2008] [Revised: 11/10/2008] [Accepted: 11/18/2008] [Indexed: 02/07/2023]
Abstract
The decameric vanadate species V(10)O(28)(6-), also referred to as decavanadate, impact proteins, lipid structures and cellular function, and show some effects in vivo on oxidative stress processes and other biological properties. The mode of action of decavanadate in many biochemical systems depends, at least in part, on the charge and size of the species and in some cases competes with the simpler oxovanadate species. The orange decavanadate that contains 10 vanadium atoms is a stable species for several days at neutral pH, but at higher pH immediately converts to the structurally and functionally distinct lower oxovanadates such as the monomer, dimer or tetramer. Although the biological effects of vanadium are generally assumed to derive from monomeric vanadate or the vanadyl cation, we show in this review that not all effects can be attributed to these simple oxovanadate forms. This topic has not previously been reviewed although background information is available [D.C. Crans, Comments Inorg. Chem. 16 (1994) 35-76; M. Aureliano (Ed.), Vanadium Biochemistry, Research Signpost Publs., Kerala, India, 2007]. In addition to pumps, channels and metabotropic receptors, lipid structures represent potential biological targets for decavanadate and some examples have been reported. Decavanadate interact with enzymes, polyphosphate, nucleotide and inositol 3-phosphate binding sites in the substrate domain or in an allosteric site, in a complex manner. In mitochondria, where vanadium was shown to accumulate following decavanadate in vivo administration, nM concentration of decavanadate induces membrane depolarization in addition to inhibiting oxygen consumption, suggesting that mitochondria may be potential targets for decameric toxicity. In vivo effects of decavanadate in piscine models demonstrated that antioxidant stress markers, lipid peroxidation and vanadium subcellular distribution is dependent upon whether or not the solutions administered contain decavanadate. The present review summarizes the reports on biological effects of decavanadate and highlights the importance of considering decavanadate in evaluations of the biological effects of vanadium.
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Affiliation(s)
- Manuel Aureliano
- CCMar and Dept. Chemistry, Biochemistry and Pharmacy, FCT, University of Algarve, Faro, Portugal.
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24
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Michel AD, Xing M, Thompson KM, Jones CA, Humphrey PPA. Decavanadate, a P2X receptor antagonist, and its use to study ligand interactions with P2X7 receptors. Eur J Pharmacol 2006; 534:19-29. [PMID: 16487507 DOI: 10.1016/j.ejphar.2006.01.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2005] [Revised: 12/22/2005] [Accepted: 01/10/2006] [Indexed: 10/25/2022]
Abstract
In this study we have studied decavanadate effects at P2X receptors. Decavanadate competitively blocked 2'- and 3'-O-(4benzoylbenzoyl) ATP (BzATP) stimulated ethidium accumulation in HEK293 cells expressing human recombinant P2X7 receptors (pK(B) 7.5). The effects of decavanadate were rapid (minutes) in both onset and offset and contrasted with the much slower kinetics of pyridoxal 5-phosphate (P5P), Coomassie brilliant blue (CBB) and 1-[N,O-bis(5-isoquinolinesulfonyl)-N-methyl-L-tyrosyl]-4-phenylpiperazine (KN62). Decavanadate competitively blocked the slowly reversible, or irreversible, blockade of the P2X7 receptor produced by P5P and oxidised ATP suggesting competition for a common binding site. However, the interaction between decavanadate and KN62 was non-competitive. Decavanadate also blocked P2X2 and P2X4 receptors but with slightly lower potency. These data demonstrate that decavanadate is the first reversible and competitive antagonist of the P2X7 receptor and is a useful tool for studying the mechanism of interaction of ligands with the P2X7 receptor.
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Affiliation(s)
- Anton D Michel
- Neurology and GI Centre of Excellence for Drug Discovery, GlaxoSmithKline Research and Development Limited, New Frontiers Science Park, Third Avenue, Harlow, Essex, CM19 5AW, UK.
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25
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Aureliano M, Tiago T, Gândara RMC, Sousa A, Moderno A, Kaliva M, Salifoglou A, Duarte RO, Moura JJG. Interactions of vanadium(V)-citrate complexes with the sarcoplasmic reticulum calcium pump. J Inorg Biochem 2005; 99:2355-61. [PMID: 16219359 DOI: 10.1016/j.jinorgbio.2005.09.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2005] [Revised: 09/05/2005] [Accepted: 09/07/2005] [Indexed: 02/07/2023]
Abstract
Among the biotargets interacting with vanadium is the calcium pump from the sarcoplasmic reticulum (SR). To this end, initial research efforts were launched with two vanadium(V)-citrate complexes, namely (NH(4))(6)[V(2)O(4)(C(6)H(4)O(7))(2)].6H(2)O and (NH(4))(6)[V(2)O(2)(O(2))(2)(C(6)H(4)O(7))(2)].4H(2)O, potentially capable of interacting with the SR calcium pump by combining kinetic studies with (51)V NMR spectroscopy. Upon dissolution in the reaction medium (concentration range: 4-0.5mM), both vanadium(V):citrate (VC) and peroxovanadium(V):citrate (PVC) complexes are partially converted into vanadate oligomers. A 1mM solution of the PVC complex, containing 184microM of the PVC complex, 94microM oxoperoxovanadium(V) (PV) species, 222microM monomeric (V1), 43microM dimeric (V2) and 53microM tetrameric (V4) species, inhibits Ca(2+) accumulation by 75 %, whereas a solution of the VC complex of the same vanadium concentration, containing 98microM of the VC complex, 263microM monomeric (V1), 64microM dimeric (V2) and 92microM tetrameric (V4) species inhibits the calcium pump activity by 33 %. In contrast, a 1 mM metavanadate solution, containing 460microM monomeric (V1), 90.2microM dimeric (V2) and 80microM tetrameric (V4) species, has no effect on Ca(2+) accumulation. The NMR signals from the VC complex (-548.0ppm), PVC complex (-551.5ppm) and PV (-611.1ppm) are broadened upon SR vesicle addition (2.5mg/ml total protein). The relative order for the half width line broadening of the NMR signals, which reflect the interaction with the protein, was found to be V4>PVC>VC>PV>V2=V1=1, with no effect observed for the V1 and V2 signals. Putting it all together the effects of two vanadium(V)-citrate complexes on the modulation of calcium accumulation and ATP hydrolysis by the SR calcium pump reflected the observed variable reactivity into the nature of key species forming upon dissolution of the title complexes in the reaction media.
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Affiliation(s)
- Manuel Aureliano
- CBME, Department of Chemistry and Biochemistry, FCT, University of the Algarve, 8005-139 Faro, Portugal.
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Abstract
Photochemical reagents that cleave proteins at specific sites (photoproteases) are useful for studying protein structure and protein-ligand interactions. PolyammineCo(III) complexes are tested here as photochemical probes to cleave proteins. Irradiation of a mixture of lysozyme, a model protein, and polyammineCo(III) complexes resulted in the facile cleavage of the peptide backbone. Photocleavage yielded two fragments of molecular weights 10.6 and 3.7 kDa, and these masses sum to the molecular mass of lysozyme (14.3 kDa). No cleavage was detected in the absence of the metal complex, in the dark, or upon irradiation at wavelengths of >420 nm. The photocleavage yield increased with irradiation time and with the concentrations of the metal complex and the protein. N-terminal sequencing of the 10.6 kDa fragment indicated residues that are identical to the N-terminus of lysozyme, and sequencing of the 3.7 kDa fragment indicated Val-Ala-Trp-Arg, an internal sequence of lysozyme. From the known primary sequence of lysozyme and the sequencing data, the cleavage site was assigned to Trp108-Val109. Molecular modeling indicates that the observed cleavage site is within few angstroms from the proposed metal binding site at Glu35-Asp52. This is the first report of the successful photocleavage of proteins, with high selectivity, by transition metal complexes. This novel observation can facilitate the rational design of transition metal complexes for the photochemical footprinting of metal binding sites on proteins.
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Affiliation(s)
- Challa V Kumar
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, USA.
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Stokes DL, Delavoie F, Rice WJ, Champeil P, McIntosh DB, Lacapère JJ. Structural Studies of a Stabilized Phosphoenzyme Intermediate of Ca2+-ATPase. J Biol Chem 2005; 280:18063-72. [PMID: 15734741 DOI: 10.1074/jbc.m500031200] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Ca(2+)-ATPase belongs to the family of P-type ATPases and maintains low concentrations of intracellular Ca(2+). Its reaction cycle consists of four main intermediates that alternate ion binding in the transmembrane domain with phosphorylation of an aspartate residue in a cytoplasmic domain. Previous work characterized an ultrastable phosphoenzyme produced first by labeling with fluorescein isothiocyanate, then by allowing this labeled enzyme to establish a maximal Ca(2+) gradient, and finally by removing Ca(2+) from the solution. This phosphoenzyme is characterized by very low fluorescence and has specific enzymatic properties suggesting the existence of a high energy phosphoryl bond. To study the structural properties of this phosphoenzyme, we used cryoelectron microscopy of two-dimensional crystals formed in the presence of decavanadate and determined the structure at 8-A resolution. To our surprise we found that at this resolution the low fluorescence phosphoenzyme had a structure similar to that of the native enzyme crystallized under equivalent conditions. We went on to use glutaraldehyde cross-linking and proteolysis for independent structural assessment and concluded that, like the unphosphorylated native enzyme, Ca(2+) and vanadate exert a strong influence over the global structure of this low fluorescence phosphoenzyme. Based on a structural model with fluorescein isothiocyanate bound at the ATP site, we suggest that the stability as well as the low fluorescence of this phosphoenzyme is due to a fluorescein-mediated cross-link between two cytoplasmic domains that prevents hydrolysis of the aspartyl phosphate. Finally, we consider the alternative possibility that phosphate transfer to fluorescein itself could explain the properties of this low fluorescence species.
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Affiliation(s)
- David L Stokes
- Skirball Institute of Biomolecular Medicine and Department of Cell Biology, New York University School of Medicine, New York, New York 10012, USA
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28
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Aureliano M, Gândara RMC. Decavanadate effects in biological systems. J Inorg Biochem 2005; 99:979-85. [PMID: 15833319 DOI: 10.1016/j.jinorgbio.2005.02.024] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2005] [Revised: 02/23/2005] [Accepted: 02/25/2005] [Indexed: 02/07/2023]
Abstract
Vanadium biological studies often disregarded the formation of decameric vanadate species known to interact, in vitro, with high-affinity with many proteins such as myosin and sarcoplasmic reticulum calcium pump and also to inhibit these biochemical systems involved in energy transduction. Moreover, very few in vivo animal studies involving vanadium consider the contribution of decavanadate to vanadium biological effects. Recently, it has been shown that an acute exposure to decavanadate but not to other vanadate oligomers induced oxidative stress and a different fate in vanadium intracellular accumulation. Several markers of oxidative stress analyzed on hepatic and cardiac tissue were monitored after in vivo effect of an acute exposure (12, 24 h and 7 days), to a sub-lethal concentration (5 mM; 1 mg/kg) of two vanadium solutions ("metavanadate" and "decavanadate"). It was observed that "decavanadate" promote different effects than other vanadate oligomers in catalase activity, glutathione content, lipid peroxidation, mitochondrial superoxide anion production and vanadium accumulation, whereas both solutions seem to equally depress reactive oxygen species (ROS) production as well as total intracellular reducing power. Vanadium is accumulated in mitochondria in particular when "decavanadate" is administered. These recent findings, that are now summarized, point out the decameric vanadate species contributions to in vivo and in vitro effects induced by vanadium in biological systems.
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Affiliation(s)
- Manuel Aureliano
- CBME, Dept. Química e Bioquímica, FCT, Universidade do Algarve, 8005-139 Faro, Portugal.
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29
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Csanády L, Adam-Vizi V. Antagonistic regulation of native Ca2+- and ATP-sensitive cation channels in brain capillaries by nucleotides and decavanadate. ACTA ACUST UNITED AC 2005; 123:743-57. [PMID: 15173222 PMCID: PMC2234573 DOI: 10.1085/jgp.200309008] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Regulation by cytosolic nucleotides of Ca2+- and ATP-sensitive nonselective cation channels (CA-NSCs) in rat brain capillary endothelial cells was studied in excised inside-out patches. Open probability (Po) was suppressed by cytosolic nucleotides with apparent KI values of 17, 9, and 2 μM for ATP, ADP, and AMP, as a consequence of high-affinity inhibition of channel opening rate and low-affinity stimulation of closing rate. Cytosolic [Ca2+] and voltage affected inhibition of Po, but not of opening rate, by ATP, suggesting that the conformation of the nucleotide binding site is influenced only by the state of the channel gate, not by that of the Ca2+ and voltage sensors. ATP inhibition was unaltered by channel rundown. Nucleotide structure affected inhibitory potency that was little sensitive to base substitutions, but was greatly diminished by 3′-5′ cyclization, removal of all phosphates, or complete omission of the base. In contrast, decavanadate potently (K1/2 = 90 nM) and robustly stimulated Po, and functionally competed with inhibitory nucleotides. From kinetic analyses we conclude that (a) ATP, ADP, and AMP bind to a common site; (b) inhibition by nucleotides occurs through simple reversible binding, as a consequence of tighter binding to the closed-channel relative to the open-channel conformation; (c) the conformation of the nucleotide binding site is not directly modulated by Ca2+ and voltage; (d) the differences in inhibitory potency of ATP, ADP, and AMP reflect their different affinities for the closed channel; and (e) though decavanadate is the only example found to date of a compound that stimulates Po with high affinity even in the presence of millimolar nucleotides, apparently by competing for the nucleotide binding site, a comparable mechanism might allow CA-NSC channels to open in living cells despite physiological levels of nucleotides. Decavanadate now provides a valuable tool for studying native CA-NSC channels and for screening cloned channels.
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Affiliation(s)
- László Csanády
- Department of Medical Biochemistry, Semmelweis University, and Neurochemical Group of the Hungarian Academy of Sciences, Budapest, Hungary.
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30
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Tiago T, Aureliano M, Moura JJG. Decavanadate as a biochemical tool in the elucidation of muscle contraction regulation. J Inorg Biochem 2004; 98:1902-10. [PMID: 15522416 DOI: 10.1016/j.jinorgbio.2004.08.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2004] [Revised: 08/17/2004] [Accepted: 08/20/2004] [Indexed: 02/07/2023]
Abstract
Recently reported decameric vanadate (V(10)) high affinity binding site in myosin S1, suggests that it can be used as a tool in the muscle contraction regulation. In the present article, it is shown that V(10) species induces myosin S1 cleavage, upon irradiation, at the 23 and 74 kDa sites, the latter being prevented by actin and the former blocked by the presence of ATP. Identical cleavage patterns were found for meta- and decavanadate solutions, indicating that V(10) and tetrameric vanadate (V(4)) have the same binding sites in myosin S1. Concentrations as low as 50 muM decavanadate (5 muM V(10) species) induces 30% of protein cleavage, whereas 500 muM metavanadate is needed to attain the same extent of cleavage. After irradiation, V(10) species is rapidly decomposed, upon protein addition, forming vanadyl (V(4+)) species during the process. It was also observed by NMR line broadening experiments that, V(10) competes with V(4) for the myosin S1 binding sites, having a higher affinity. In addition, V(4) interaction with myosin S1 is highly affected by the products release during ATP hydrolysis in the presence or absence of actin, whereas V(10) appears to be affected at a much lower extent. From these results it is proposed that the binding of vanadate oligomers to myosin S1 at the phosphate loop (23 kDa site) is probably the cause of the actin stimulated myosin ATPase inhibition by the prevention of ATP/ADP exchange, and that this interaction is favoured for higher vanadate anions, such as V(10).
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Affiliation(s)
- Teresa Tiago
- Departamento de Química e Bioquímica, Faculdade de Ciências e Tecnologia, Universidade do Algarve, FCT, UALG, Gambelas, 8005-139 Faro, Portugal.
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31
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Nilius B, Prenen J, Janssens A, Voets T, Droogmans G. Decavanadate modulates gating of TRPM4 cation channels. J Physiol 2004; 560:753-65. [PMID: 15331675 PMCID: PMC1665285 DOI: 10.1113/jphysiol.2004.070839] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
We have tested the effects of decavanadate (DV), a compound known to interfere with ATP binding in ATP-dependent transport proteins, on TRPM4, a Ca(2+)-activated, voltage-dependent monovalent cation channel, whose activity is potently blocked by intracellular ATP(4-). Application of micromolar Ca(2+) concentrations to the cytoplasmic side of inside-out patches led to immediate current activation followed by rapid current decay, which can be explained by an at least 30-fold decreased apparent affinity for Ca(2+). Subsequent application of DV (10 microm) strongly affected the voltage-dependent gating of the channel, resulting in large sustained currents over the voltage range between -180 and +140 mV. The effect of DV was half-maximal at a concentration of 1.9 microm. The Ca(2+)- and voltage-dependent gating of the channel was well described by a sequential kinetic scheme in which Ca(2+) binding precedes voltage-dependent gating. The effects of DV could be explained by an action on the voltage-dependent closing step. Surprisingly, DV did not antagonize the effect of ATP(4-) on TRPM4, but caused a nearly 10-fold increase in the sensitivity of the ATP(4-) block. TRPM5, which is the most homologous channel to TRPM4, was not modulated by DV. The effect of DV was lost in a TRPM4 chimera in which the C-terminus was substituted with that of TRPM5. Deletion of a cluster in the C-terminus of TRPM4 containing positively charged amino acid residues with a high homology to part of the decavanadate binding site in SERCA pumps, completely abolished the DV effect but also accelerated desensitization. Deletion of a similar site in the N-terminus had no effects on DV responses. These results indicate that the C-terminus of TRPM4 is critically involved in mediating the DV effects. In conclusion, decavanadate modulates TRPM4, but not TRPM5, by inhibiting voltage-dependent closure of the channel.
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Affiliation(s)
- Bernd Nilius
- Department of Physiology, Campus Gasthuisberg, KU Leuven, Herestraat 49, B-3000 Leuven, Belgium.
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32
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Crans DC, Smee JJ, Gaidamauskas E, Yang L. The chemistry and biochemistry of vanadium and the biological activities exerted by vanadium compounds. Chem Rev 2004; 104:849-902. [PMID: 14871144 DOI: 10.1021/cr020607t] [Citation(s) in RCA: 987] [Impact Index Per Article: 49.4] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Debbie C Crans
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA.
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33
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Ryan C, Stokes DL, Chen M, Zhang Z, Hardwicke PMD. Effect of orthophosphate, nucleotide analogues, ADP, and phosphorylation on the cytoplasmic domains of Ca(2+)-ATPase from scallop sarcoplasmic reticulum. J Biol Chem 2003; 279:5380-6. [PMID: 14645252 DOI: 10.1074/jbc.m310085200] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The effects of orthophosphate, nucleotide analogues, ADP, and covalent phosphorylation on the tryptic fragmentation patterns of the E1 and E2 forms of scallop Ca-ATPase were examined. Sites preferentially cleaved by trypsin in the E1 form of the Ca-ATPase were detected in the nucleotide (N) and phosphorylation (P) domains, as well as the actuator (A) domain. These sites were occluded in the E2 (Ca(2+)-free) form of the enzyme, consistent with mutual protection of the A, N, and P domains through their association into a clustered structure. Similar protection of cytoplasmic Ca(2+)-dependent tryptic cleavage sites was observed when the catalytic binding site for substrate on the E1 form of scallop Ca-ATPase was occupied by Pi, AMP-PNP, AMP-PCP, or ADP despite the presence of saturating levels of Ca2+. These results suggest that occupation of the catalytic site on E1 can induce condensation of the cytoplasmic domains to yield a unique structural intermediate that may be related to the form of the enzyme in which the active site is prepared for phosphoryl transfer. The effect of Pi on the E2 form of the scallop Ca-ATPase was also investigated, when it was found that formation of E2-P led to extreme resistance toward secondary cleavage by trypsin and stabilization of enzymatic activity for long periods of time.
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Affiliation(s)
- Chris Ryan
- Department of Biochemistry and Molecular Biology, Southern Illinois University, Carbondale, Illinois 62901, USA
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Pezza RJ, Villarreal MA, Montich GG, Argaraña CE. Vanadate inhibits the ATPase activity and DNA binding capability of bacterial MutS. A structural model for the vanadate-MutS interaction at the Walker A motif. Nucleic Acids Res 2002; 30:4700-8. [PMID: 12409461 PMCID: PMC135828 DOI: 10.1093/nar/gkf606] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
MutS, a member of the ABC ATPases superfamily, is a mismatch DNA-binding protein constituent of the DNA post-replicative mismatch repair system (MMRS). In this work, it is shown that the ATPase activity of Pseudomonas aeruginosa and Escherichia coli MutS is inhibited by ortho- and decavanadate. Structural comparison of the region involved in the ATP binding of E.coli MutS with the corresponding region of other ABC ATPases inhibited by vanadate, including the myosin- orthovanadate-Mg complex, showed that they are highly similar. From these results it is proposed that the orthovanadate inhibition of MutS ATPase can take place by a similar mechanism to that described for other ATPases. Docking of decavanadate on the ATP-binding region of MutS showed that the energetically more favorable interaction of this compound would take place with the complex MutS- ADP-Mg, suggesting that the inhibitory effect could be produced by a steric impediment of the protein ATP/ADP exchange. Besides the effect observed on the ATPase activity, vanadate also affects the DNA-binding capability of the protein, and partially inhibits the oligomerization of MutS and the temperature-induced inactivation of the protein. From the results obtained, and considering that vanadate is an intracellular trace component, this compound could be considered as a new modulator of the MMRS.
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Affiliation(s)
- Roberto J Pezza
- Centro de Investigaciones en Química Biológica de Córdoba, UNC-CONICET, Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, Argentina
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35
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Clausen JD, McIntosh DB, Woolley DG, Andersen JP. Importance of Thr-353 of the conserved phosphorylation loop of the sarcoplasmic reticulum Ca2+-ATPase in MgATP binding and catalytic activity. J Biol Chem 2001; 276:35741-50. [PMID: 11438551 DOI: 10.1074/jbc.m105434200] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mutants in which Thr-353 of the Ca(2+)-ATPase of sarcoplasmic reticulum had been replaced with alanine, serine, glutamine, cysteine, valine, aspartate, or tyrosine were analyzed functionally. All the mutations severely affected MgATP binding, whereas ATP binding was close to normal in the alanine, serine, glutamine, and valine mutants. In the serine and valine mutants, the maximum rate of phosphorylation from MgATP was 8- and 600-fold lower, respectively, compared with wild type. Replacement of Mg(2+) with Mn(2+) led to a 1.5-fold enhancement of the maximum phosphorylation rate in the valine mutant and a 5-fold reduction in the wild type. The turnover of the phosphoenzyme formed from MgATP was slowed 1-2 orders of magnitude relative to wild type in the alanine, serine, and valine mutants, but was close to normal in the aspartate and cysteine mutants. Only the serine mutant formed a phosphoenzyme in the backward reaction with P(i), and the hydrolysis of this intermediate was greatly enhanced. Analysis of the functional changes in the mutants in the light of the recent high resolution structure of the Ca(2+)-ATPase crystallized without the MgATP substrate suggests that, in the native activated state of the enzyme, the side chain hydroxyl of Thr-353 participates in important interactions with nucleotide and phosphate, possibly in catalysis, whereas the main chain carbonyl of Thr-353, but not the side chain, may coordinate the catalytic Mg(2+).
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Affiliation(s)
- J D Clausen
- Department of Physiology, University of Aarhus, DK-8000 Aarhus C, Denmark
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