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Segado-Centellas M, Falaise C, Leclerc N, Mpacko Priso G, Haouas M, Cadot E, Bo C. Nanoconfinement of polyoxometalates in cyclodextrin: computational inspections of the binding affinity and experimental demonstrations of reactivity modulation. Chem Sci 2024:d4sc01949k. [PMID: 39282647 PMCID: PMC11391412 DOI: 10.1039/d4sc01949k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2024] [Accepted: 09/01/2024] [Indexed: 09/19/2024] Open
Abstract
Chaotropic polyoxometalates (POMs) form robust host-guest complexes with γ-cyclodextrin (γ-CD), offering promising applications in catalysis, electrochemical energy storage, and nanotechnology. In this article, we provide the first computational insights on the supramolecular binding mechanisms using density-functional theory and classical molecular dynamics simulations. Focusing on the encapsulation of archetypal Keggin-type POMs (PW12O40 3-, SiW12O40 4- and BW12O40 5-), our findings reveal that the lowest-charged POM, namely PW12O40 3- spontaneously confines within the wider rim of γ-CD, but BW12O40 5- does not exhibit this behaviour. This striking affinity for the hydrophobic pocket of γ-CD originates from the structural characteristics of water molecules surrounding PW12O40 3-. Moreover, through validation using 31P NMR spectroscopy, we demonstrate that this nanoconfinement regulates drastically the POM reactivity, including its capability to undergo electron transfer and intermolecular metalate Mo/W exchanges. Finally, we exploit this nanoconfinement strategy to isolate the elusive mixed addenda POM PW11MoO40 3-.
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Affiliation(s)
- Mireia Segado-Centellas
- Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science & Technology (BIST) Av. Països Catalans 16 43007 Tarragona Spain
| | - Clément Falaise
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay 45 Avenue des Etats-Unis 78035 Versailles France
| | - Nathalie Leclerc
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay 45 Avenue des Etats-Unis 78035 Versailles France
| | - Gabrielle Mpacko Priso
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay 45 Avenue des Etats-Unis 78035 Versailles France
| | - Mohamed Haouas
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay 45 Avenue des Etats-Unis 78035 Versailles France
| | - Emmanuel Cadot
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay 45 Avenue des Etats-Unis 78035 Versailles France
| | - Carles Bo
- Institute of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science & Technology (BIST) Av. Països Catalans 16 43007 Tarragona Spain
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2
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Aziz I, Kaltwasser S, Kayastha K, Khera R, Vonck J, Ermler U. The molybdenum storage protein forms and deposits distinct polynuclear tungsten oxygen aggregates. J Inorg Biochem 2022; 234:111904. [DOI: 10.1016/j.jinorgbio.2022.111904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/08/2022] [Accepted: 06/12/2022] [Indexed: 11/30/2022]
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3
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Chen Q, Wang MM, Zhang Y, Zhang DD. Selective Adsorption of Hemoglobin in Human Whole Blood with a Nickel Monosubstituted Silicotungstic Acid Hybrid. ACS OMEGA 2022; 7:22633-22638. [PMID: 35811926 PMCID: PMC9260775 DOI: 10.1021/acsomega.2c01997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 06/07/2022] [Indexed: 06/15/2023]
Abstract
A nickel monosubstituted polyoxometalate (POM)/polyaniline organic-inorganic hybrid SiW11Ni/PANI was synthesized using the liquid-phase method at room temperature to achieve the solidification of water-soluble POMs. The SiW11Ni/PANI hybrid was characterized by scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, X-ray diffraction, and zeta potential. On the basis of π-π stacking and affinity interaction between the SiW11Ni/PANI hybrid and proteins, the SiW11Ni/PANI hybrid showed good adsorption selectivity to hemoglobin (Hb). At pH 7.0, 0.5 mg of SiW11Ni/PANI resulted in an adsorption efficiency of 92.4% for 1 mL of 100 μg mL-1 Hb. The adsorption behavior of Hb on the surface of the hybrid fitted with the Langmuir model, and the maximum adsorption capacity was 692 mg g-1. The adsorbed Hb was eluted by BR (0.04 mol L-1, pH 9), providing a recovery of 94%. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis assay results indicated that the Hb in human whole blood could selectively be adsorbed by the SiW11Ni/PANI hybrid, and the obtained Hb was with high purity. It could expand the application of POMs in life science due to the application of the POM hybrid in protein isolation/purification.
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Affiliation(s)
- Qing Chen
- Department
of Pharmacy, Shenyang Medical College, Shenyang 110034, China
| | - Meng-Meng Wang
- Department
of Pharmacy, Shenyang Medical College, Shenyang 110034, China
| | - Yang Zhang
- Department
of Pharmacy, Shenyang Medical College, Shenyang 110034, China
| | - Dan-Dan Zhang
- Department
of Public Health, Shenyang Medical College, Shenyang 110034, China
- Public
Health Laboratory Centre, Shenyang Medical
College, Shenyang 110034, China
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4
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Gumerova NI, Rompel A. Interweaving Disciplines to Advance Chemistry: Applying Polyoxometalates in Biology. Inorg Chem 2021; 60:6109-6114. [PMID: 33787237 PMCID: PMC8154434 DOI: 10.1021/acs.inorgchem.1c00125] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
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This Viewpoint brings
awareness of the challenges and subsequent
breakthroughs at the intersection of different disciplines, illustrated
by the example of the influence biological entities exerted on a huge
class of inorganic coordination compounds, called polyoxometalates
(POMs). We highlight the possible effects of biological systems on
POMs that need to be considered, thereby emphasizing the depth and
complexity of interdisciplinary work. We map POMs’ structural,
electrochemical, and stability properties in the presence of biomolecules
and stress the potential challenges related to inorganic coordination
chemistry carried out in biological systems. This Viewpoint shows
that new chemistry is available at the intersections between disciplines
and aims to guide the community toward a discussion about current
as well as future trends in truly interdisciplinary work. We discuss the investigation of polyoxometalates in biological
systems as one future direction of chemistry. Highly interesting,
new, and sometimes spectacular findings and applications can be obtained
from correctly carried out interdisciplinary research. In this Viewpoint,
the challenges of truly interdisciplinary work and concepts for overcoming
boundaries while working on intertwining disciplines are discussed.
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Affiliation(s)
- Nadiia I Gumerova
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, Wien 1090, Austria
| | - Annette Rompel
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, Wien 1090, Austria
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Molybdate pumping into the molybdenum storage protein via an ATP-powered piercing mechanism. Proc Natl Acad Sci U S A 2019; 116:26497-26504. [PMID: 31811022 DOI: 10.1073/pnas.1913031116] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The molybdenum storage protein (MoSto) deposits large amounts of molybdenum as polyoxomolybdate clusters in a heterohexameric (αβ)3 cage-like protein complex under ATP consumption. Here, we suggest a unique mechanism for the ATP-powered molybdate pumping process based on X-ray crystallography, cryoelectron microscopy, hydrogen-deuterium exchange mass spectrometry, and mutational studies of MoSto from Azotobacter vinelandii First, we show that molybdate, ATP, and Mg2+ consecutively bind into the open ATP-binding groove of the β-subunit, which thereafter becomes tightly locked by fixing the previously disordered N-terminal arm of the α-subunit over the β-ATP. Next, we propose a nucleophilic attack of molybdate onto the γ-phosphate of β-ATP, analogous to the similar reaction of the structurally related UMP kinase. The formed instable phosphoric-molybdic anhydride becomes immediately hydrolyzed and, according to the current data, the released and accelerated molybdate is pressed through the cage wall, presumably by turning aside the Metβ149 side chain. A structural comparison between MoSto and UMP kinase provides valuable insight into how an enzyme is converted into a molecular machine during evolution. The postulated direct conversion of chemical energy into kinetic energy via an activating molybdate kinase and an exothermic pyrophosphatase reaction to overcome a proteinous barrier represents a novelty in ATP-fueled biochemistry, because normally, ATP hydrolysis initiates large-scale conformational changes to drive a distant process.
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Navarro-Rodríguez M, Buesa JM, Rubio LM. Genetic and Biochemical Analysis of the Azotobacter vinelandii Molybdenum Storage Protein. Front Microbiol 2019; 10:579. [PMID: 30984129 PMCID: PMC6448029 DOI: 10.3389/fmicb.2019.00579] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 03/06/2019] [Indexed: 11/13/2022] Open
Abstract
The N2 fixing bacterium Azotobacter vinelandii carries a molybdenum storage protein, referred to as MoSto, able to bind 25-fold more Mo than needed for maximum activity of its Mo nitrogenase. Here we have investigated a plausible role of MoSto as obligate intermediate in the pathway that provides Mo for the biosynthesis of nitrogenase iron-molybdenum cofactor (FeMo-co). The in vitro FeMo-co synthesis and insertion assay demonstrated that purified MoSto functions as Mo donor and that direct interaction with FeMo-co biosynthetic proteins stimulated Mo donation. The phenotype of an A. vinelandii strain lacking the MoSto subunit genes (ΔmosAB) was analyzed. Consistent with its role as storage protein, the ΔmosAB strain showed severe impairment to accumulate intracellular Mo and lower resilience than wild type to Mo starvation as demonstrated by decreased in vivo nitrogenase activity and competitive growth index. In addition, it was more sensitive than the wild type to diazotrophic growth inhibition by W. The ΔmosAB strain was found to readily derepress vnfDGK upon Mo step down, in contrast to the wild type that derepressed Vnf proteins only after prolonged Mo starvation. The ΔmosAB mutation was then introduced in a strain lacking V and Fe-only nitrogenase structural genes (Δvnf Δanf) to investigate possible compensations from these alternative systems. When grown in Mo-depleted medium, the ΔmosAB and mosAB + strains showed low but similar nitrogenase activities regardless of the presence of Vnf proteins. This study highlights the selective advantage that MoSto confers to A. vinelandii in situations of metal limitation as those found in many soil ecosystems. Such a favorable trait should be included in the gene complement of future nitrogen fixing plants.
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Affiliation(s)
- Mónica Navarro-Rodríguez
- Centro de Biotecnología y Genómica de Plantas (CBGP), Universidad Politécnica de Madrid (UPM), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain
| | - José María Buesa
- Centro de Biotecnología y Genómica de Plantas (CBGP), Universidad Politécnica de Madrid (UPM), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain
| | - Luis M Rubio
- Centro de Biotecnología y Genómica de Plantas (CBGP), Universidad Politécnica de Madrid (UPM), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain
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7
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Van Rompuy LS, Parac-Vogt TN. Interactions between polyoxometalates and biological systems: from drug design to artificial enzymes. Curr Opin Biotechnol 2018; 58:92-99. [PMID: 30529815 DOI: 10.1016/j.copbio.2018.11.013] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 11/20/2018] [Indexed: 12/11/2022]
Abstract
Polyoxometalates have long been studied in a variety of biological applications. Interactions between the highly charged POM molecules and biological molecules frequently occur through hydrogen-bonding and electrostatic interactions. Tellurium-centred Anderson-Evans POMs show exceptional promise as crystallization agents, while acidic and metal-substituted POMs may provide interesting alternatives to enzymes in proteomics applications. While POMs also show interesting results in a number of medicinal applications, for example as anti-amyloid agents for the treatment of Alzheimer's disease and as anti-tumoral agents, their use is often impeded by their toxicity. Many recent studies have therefore focussed on POM-functionalization to reduce toxicity and increase activity by addition of biological targeting molecules.
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Affiliation(s)
- Laura S Van Rompuy
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium
| | - Tatjana N Parac-Vogt
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium.
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Poppe J, Brünle S, Hail R, Wiesemann K, Schneider K, Ermler U. The Molybdenum Storage Protein: A soluble ATP hydrolysis-dependent molybdate pump. FEBS J 2018; 285:4602-4616. [PMID: 30367742 DOI: 10.1111/febs.14684] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 10/11/2018] [Accepted: 10/23/2018] [Indexed: 12/30/2022]
Abstract
A continuous FeMo cofactor supply for nitrogenase maturation is ensured in Azotobacter vinelandii by developing a cage-like molybdenum storage protein (MoSto) capable to store ca. 120 molybdate molecules ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mtext>MoO</mml:mtext> <mml:mrow><mml:mn>4</mml:mn></mml:mrow> <mml:mrow><mml:mn>2</mml:mn> <mml:mo>-</mml:mo></mml:mrow> </mml:msubsup> </mml:math> ) as discrete polyoxometalate (POM) clusters. To gain mechanistic insight into this process, MoSto was characterized by Mo and ATP/ADP content, structural, and kinetic analysis. We defined three functionally relevant states specified by the presence of both ATP/ADP and POM clusters (MoStofunct ), of only ATP/ADP (MoStobasal ) and of neither ATP/ADP nor POM clusters (MoStozero ), respectively. POM clusters are only produced when ATP is hydrolyzed to ADP and phosphate. Vmax was ca. 13 μmolphosphate ·min-1 ·mg-1 and Km for molybdate and ATP/Mg2+ in the low micromolar range. ATP hydrolysis presumably proceeds at subunit α, inferred from a highly occupied α-ATP/Mg2+ and a weaker occupied β-ATP/no Mg2+ -binding site found in the MoStofunct structure. Several findings indicate that POM cluster storage is separated into a rapid ATP hydrolysis-dependent molybdate transport across the protein cage wall and a slow molybdate assembly induced by combined auto-catalytic and protein-driven processes. The cage interior, the location of the POM cluster depot, is locked in all three states and thus not rapidly accessible for molybdate from the outside. Based on Vmax , the entire Mo storage process should be completed in less than 10 s but requires, according to the molybdate content analysis, ca. 15 min. Long-time incubation of MoStobasal with nonphysiological high molybdate amounts implicates an equilibrium in and outside the cage and POM cluster self-formation without ATP hydrolysis. DATABASES: The crystal structures MoSto in the MoSto-F6, MoSto-F7, MoStobasal , MoStozero , and MoSto-F1vitro states were deposited to PDB under the accession numbers PDB 6GU5, 6GUJ, 6GWB, 6GWV, and 6GX4.
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Affiliation(s)
- Juliane Poppe
- Max-Planck-Institut für Biophysik, Frankfurt am Main, Germany
| | - Steffen Brünle
- Max-Planck-Institut für Biophysik, Frankfurt am Main, Germany
| | - Ron Hail
- Max-Planck-Institut für Biophysik, Frankfurt am Main, Germany.,Biochemie I, Fakultät für Chemie, Universität Bielefeld, Bielefeld, Germany
| | - Katharina Wiesemann
- Abteilung molelukare Biowissensschaften, Molekulare Zellbiologie der Pflanzen, Goethe Universität, Frankfurt am Main, Germany
| | - Klaus Schneider
- Biochemie I, Fakultät für Chemie, Universität Bielefeld, Bielefeld, Germany
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik, Frankfurt am Main, Germany
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9
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Brünle S, Poppe J, Hail R, Demmer U, Ermler U. The molybdenum storage protein - A bionanolab for creating experimentally alterable polyoxomolybdate clusters. J Inorg Biochem 2018; 189:172-179. [PMID: 30278367 DOI: 10.1016/j.jinorgbio.2018.09.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 09/11/2018] [Accepted: 09/15/2018] [Indexed: 10/28/2022]
Affiliation(s)
- Steffen Brünle
- Max-Planck-Institut für Biophysik, Max-von-Laue-Str. 3, D-60438 Frankfurt/Main, Germany
| | - Juliane Poppe
- Max-Planck-Institut für Biophysik, Max-von-Laue-Str. 3, D-60438 Frankfurt/Main, Germany
| | - Ron Hail
- Max-Planck-Institut für Biophysik, Max-von-Laue-Str. 3, D-60438 Frankfurt/Main, Germany; Biochemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
| | - Ulrike Demmer
- Max-Planck-Institut für Biophysik, Max-von-Laue-Str. 3, D-60438 Frankfurt/Main, Germany
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik, Max-von-Laue-Str. 3, D-60438 Frankfurt/Main, Germany.
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Bijelic A, Rompel A. Polyoxometalates: more than a phasing tool in protein crystallography. CHEMTEXTS 2018; 4:10. [PMID: 30596006 PMCID: PMC6294228 DOI: 10.1007/s40828-018-0064-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 08/06/2018] [Indexed: 01/18/2023]
Abstract
Protein crystallography is the most widely used method for determining the molecular structure of proteins and obtaining structural information on protein–ligand complexes at the atomic level. As the structure determines the functions and properties of a protein, crystallography is of immense importance for nearly all research fields related to biochemistry. However, protein crystallography suffers from some major drawbacks, whereby the unpredictability of the crystallization process represents the main bottleneck. Crystallization is still more or less a ‘trial and error’ based procedure, and therefore, very time and resource consuming. Many strategies have been developed in the past decades to improve or enable the crystallization of proteins, whereby the use of so-called additives, which are mostly small molecules that make proteins more amenable to crystallization, is one of the most convenient and successful methods. Most of the commonly used additives are, however, restricted to particular crystallization conditions or groups of proteins. Therefore, a more universal additive addressing a wider range of proteins and being applicable to a broad spectrum of crystallization conditions would represent a significant advance in the field of protein crystallography. In recent years, polyoxometalates (POMs) emerged as a promising group of crystallization additives due to their unique structures and properties. In this regard, the tellurium-centered Anderson–Evans polyoxotungstate [TeW6O24]6− (TEW) showed its high potential as crystallization additive. In this lecture text, the development of POMs as tools in protein crystallography are discussed with a special focus on the so far most successful cluster TEW.
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Affiliation(s)
- Aleksandar Bijelic
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, 1090 Vienna, Austria
| | - Annette Rompel
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, 1090 Vienna, Austria
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11
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Arefian M, Mirzaei M, Eshtiagh-Hosseini H, Frontera A. A survey of the different roles of polyoxometalates in their interaction with amino acids, peptides and proteins. Dalton Trans 2017; 46:6812-6829. [DOI: 10.1039/c7dt00894e] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This perspective provides a comprehensive description of the different roles of POMs in their interaction with relevant biological molecules.
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Affiliation(s)
- Mina Arefian
- Department of Chemistry
- Ferdowsi University of Mashhad
- Mashhad 917751436
- Iran
| | - Masoud Mirzaei
- Department of Chemistry
- Ferdowsi University of Mashhad
- Mashhad 917751436
- Iran
| | | | - Antonio Frontera
- Departament de Química
- Universitat de les Illes Balears
- 07122 Palma de Mallorca
- Spain
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12
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Sippel D, Schlesier J, Rohde M, Trncik C, Decamps L, Djurdjevic I, Spatzal T, Andrade SLA, Einsle O. Production and isolation of vanadium nitrogenase from Azotobacter vinelandii by molybdenum depletion. J Biol Inorg Chem 2016; 22:161-168. [DOI: 10.1007/s00775-016-1423-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 11/23/2016] [Indexed: 01/10/2023]
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13
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Molitor C, Bijelic A, Rompel A. In situ formation of the first proteinogenically functionalized [TeW 6O 24O 2(Glu)] 7- structure reveals unprecedented chemical and geometrical features of the Anderson-type cluster. Chem Commun (Camb) 2016; 52:12286-12289. [PMID: 27722437 PMCID: PMC5066560 DOI: 10.1039/c6cc07004c] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 09/06/2016] [Indexed: 11/21/2022]
Abstract
The chemistry of polyoxometalates (POMs) in a protein environment is an almost unexplored but highly relevant research field as important biological and pharmacological attributes of certain POMs are based on their interactions with proteins. We report on the A-type Anderson-Evans polyoxotungstate, [TeW6O24]6- (TEW), mediated crystallization of Coreopsis grandiflora aurone synthase (cgAUS1) using ∼0.24 mM protein and 1.0 mM TEW. The 1.78 Å crystal structure reveals the covalent binding of TEW to the protein under the formation of an unprecedented polyoxotungstate cluster, [TeW6O24O2(Glu)]7- (GluTEW). The polyoxotungstate-protein complex exhibits the first covalent bond between a protein and the A-type Anderson-Evans cluster, an archetype where up to now no hybrid structures exist. The polyoxotungstate is modified at two of its six addenda tungsten atoms, which covalently bind to the carboxylic oxygen atoms of glutamic acid (Glu157), leading to W-O distances of ∼2.35 Å. This ligand substitution reaction is accompanied by a reduction of the coordination number of two μ3 polyoxotungstate oxygen atoms. This is so far unique since all known hybridizations of the Anderson-Evans POM with organic units have been obtained via the functionalization of the B-type Anderson-Evans structure through its bridging oxygen atoms. The structure reported here proves the reactivity of this POM archetype's addenda atoms as it has been administered into the protein solution as a pre-assembled cluster. Moreover, the novel cluster [TeW6O24O2(Glu)]7- displays the great versatility of the Anderson-Evans POM class.
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Affiliation(s)
- Christian Molitor
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, 1090 Wien, Austria.
| | - Aleksandar Bijelic
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, 1090 Wien, Austria.
| | - Annette Rompel
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, 1090 Wien, Austria.
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14
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Bijelic A, Rompel A. The use of polyoxometalates in protein crystallography - An attempt to widen a well-known bottleneck. Coord Chem Rev 2015; 299:22-38. [PMID: 26339074 PMCID: PMC4504029 DOI: 10.1016/j.ccr.2015.03.018] [Citation(s) in RCA: 171] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 03/23/2015] [Indexed: 02/01/2023]
Abstract
Polyoxometalates (POMs) are discrete polynuclear metal-oxo anions with a fascinating variety of structures and unique chemical and physical properties. Their application in various fields is well covered in the literature, however little information about their usage in protein crystallization is available. This review summarizes the impact of the vast class of POMs on the formation of protein crystals, a well-known (frustrating) bottleneck in macromolecular crystallography, with the associated structure elucidation and a particular emphasis focused on POM's potential as a powerful crystallization additive for future research. The Protein Data Bank (PDB) was scanned for protein structures with incorporated POMs which were assigned a PDB ligand ID resulting in 30 PDB entries. These structures have been analyzed with regard to (i) the structure of POM itself in the immediate protein environment, (ii) the kind of interaction and position of the POM within the protein structure and (iii) the beneficial effects of POM on protein crystallography apparent so far.
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Affiliation(s)
| | - Annette Rompel
- Institut für Biophysikalische Chemie, Fakultät für Chemie, Universität Wien, Althanstraße 14, 1090 Wien, Austria1
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