1
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Petrovskii SK, Grachova EV, Monakhov KY. Bioorthogonal chemistry of polyoxometalates - challenges and prospects. Chem Sci 2024; 15:4202-4221. [PMID: 38516091 PMCID: PMC10952089 DOI: 10.1039/d3sc06284h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 02/19/2024] [Indexed: 03/23/2024] Open
Abstract
Bioorthogonal chemistry has enabled scientists to carry out controlled chemical processes in high yields in vivo while minimizing hazardous effects. Its extension to the field of polyoxometalates (POMs) could open up new possibilities and new applications in molecular electronics, sensing and catalysis, including inside living cells. However, this comes with many challenges that need to be addressed to effectively implement and exploit bioorthogonal reactions in the chemistry of POMs. In particular, how to protect POMs from the biological environment but make their reactivity selective towards specific bioorthogonal tags (and thereby reduce their toxicity), as well as which bioorthogonal chemistry protocols are suitable for POMs and how reactions can be carried out are questions that we are exploring herein. This perspective conceptualizes and discusses advances in the supramolecular chemistry of POMs, their click chemistry, and POM-based surface engineering to develop innovative bioorthogonal approaches tailored to POMs and to improve POM biological tolerance.
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Affiliation(s)
| | - Elena V Grachova
- Institute of Chemistry, St Petersburg University Universitetskii pr. 26 St. Petersburg 198504 Russia
| | - Kirill Yu Monakhov
- Leibniz Institute of Surface Engineering (IOM) Permoserstr. 15 Leipzig 04318 Germany
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2
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Soria-Carrera H, Atrián-Blasco E, Martín-Rapún R, Mitchell SG. Polyoxometalate-peptide hybrid materials: from structure-property relationships to applications. Chem Sci 2022; 14:10-28. [PMID: 36605748 PMCID: PMC9769095 DOI: 10.1039/d2sc05105b] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 11/16/2022] [Indexed: 11/17/2022] Open
Abstract
Organo-functionalisation of polyoxometalates (POMs) represents an effective approach to obtain diverse arrays of functional structures and materials, where the introduction of organic moieties into the POM molecules can dramatically change their surface chemistry, charge, polarity, and redox properties. The synergistic combination of POMs and peptides, which perform a myriad of essential roles within cellular biochemistry, including protection and transport in living organisms, leads to functional hybrid materials with unique properties. In this Perspective article, we present the principal synthetic routes to prepare and characterise POM-peptide hybrids, together with a comprehensive description of how their properties - such as redox chemistry, stereochemistry and supramolecular self-assembly - give rise to materials with relevant catalytic, adhesive, and biomedical applications. By presenting the state-of-the-art of the POM-peptide field, we show specifically how emerging chemical approaches can be harnessed to develop tailored POM-peptide materials with synergistic properties for applications in a variety of disciplines.
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Affiliation(s)
- Héctor Soria-Carrera
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza c/ Pedro Cerbuna 12 50009 Zaragoza Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III 28029 Madrid Spain
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Zaragoza c/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Elena Atrián-Blasco
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza c/ Pedro Cerbuna 12 50009 Zaragoza Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III 28029 Madrid Spain
| | - Rafael Martín-Rapún
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza c/ Pedro Cerbuna 12 50009 Zaragoza Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III 28029 Madrid Spain
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Zaragoza c/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Scott G Mitchell
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza c/ Pedro Cerbuna 12 50009 Zaragoza Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III 28029 Madrid Spain
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3
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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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4
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González-Cabaleiro R, Thompson JA, Vilà-Nadal L. Looking for Options to Sustainably Fixate Nitrogen. Are Molecular Metal Oxides Catalysts a Viable Avenue? Front Chem 2021; 9:742565. [PMID: 34595154 PMCID: PMC8476845 DOI: 10.3389/fchem.2021.742565] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 08/17/2021] [Indexed: 11/13/2022] Open
Abstract
Fast and reliable industrial production of ammonia (NH3) is fundamentally sustaining modern society. Since the early 20th Century, NH3 has been synthesized via the Haber-Bosch process, running at conditions of around 350-500°C and 100-200 times atmospheric pressure (15-20 MPa). Industrial ammonia production is currently the most energy-demanding chemical process worldwide and contributes up to 3% to the global carbon dioxide emissions. Therefore, the development of more energy-efficient pathways for ammonia production is an attractive proposition. Over the past 20 years, scientists have imagined the possibility of developing a milder synthesis of ammonia by mimicking the nitrogenase enzyme, which fixes nitrogen from the air at ambient temperatures and pressures to feed leguminous plants. To do this, we propose the use of highly reconfigurable molecular metal oxides or polyoxometalates (POMs). Our proposal is an informed design of the polyoxometalate after exploring the catabolic pathways that cyanobacteria use to fix N2 in nature, which are a different route than the one followed by the Haber-Bosch process. Meanwhile, the industrial process is a "brute force" system towards breaking the triple bond N-N, needing high pressure and high temperature to increase the rate of reaction, nature first links the protons to the N2 to later easier breaking of the triple bond at environmental temperature and pressure. Computational chemistry data on the stability of different polyoxometalates will guide us to decide the best design for a catalyst. Testing different functionalized molecular metal oxides as ammonia catalysts laboratory conditions will allow for a sustainable reactor design of small-scale production.
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Affiliation(s)
| | - Jake A Thompson
- School of Chemistry, University of Glasgow, Glasgow, United Kingdom
| | - Laia Vilà-Nadal
- School of Chemistry, University of Glasgow, Glasgow, United Kingdom
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5
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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
![]()
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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6
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Greijer B, De Donder T, Nestor G, Eriksson JE, Seisenbaeva GA, Kessler VG. Complexes of Keggin POMs [PM
12
O
40
]
3−
(M=Mo, W) with GlyGlyGly and GlyGlyGlyGly Oligopeptides. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000855] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Björn Greijer
- Department of Molecular Sciences Swedish University of Agricultural Sciences Box 7015 75007 Uppsala Sweden
| | - Timothy De Donder
- Department of Molecular Sciences Swedish University of Agricultural Sciences Box 7015 75007 Uppsala Sweden
| | - Gustav Nestor
- Department of Molecular Sciences Swedish University of Agricultural Sciences Box 7015 75007 Uppsala Sweden
| | - Jan E. Eriksson
- Department of Molecular Sciences Swedish University of Agricultural Sciences Box 7015 75007 Uppsala Sweden
| | - Gulaim A. Seisenbaeva
- Department of Molecular Sciences Swedish University of Agricultural Sciences Box 7015 75007 Uppsala Sweden
| | - Vadim G. Kessler
- Department of Molecular Sciences Swedish University of Agricultural Sciences Box 7015 75007 Uppsala Sweden
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7
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Burén S, Jiménez-Vicente E, Echavarri-Erasun C, Rubio LM. Biosynthesis of Nitrogenase Cofactors. Chem Rev 2020; 120:4921-4968. [PMID: 31975585 PMCID: PMC7318056 DOI: 10.1021/acs.chemrev.9b00489] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Indexed: 12/30/2022]
Abstract
Nitrogenase harbors three distinct metal prosthetic groups that are required for its activity. The simplest one is a [4Fe-4S] cluster located at the Fe protein nitrogenase component. The MoFe protein component carries an [8Fe-7S] group called P-cluster and a [7Fe-9S-C-Mo-R-homocitrate] group called FeMo-co. Formation of nitrogenase metalloclusters requires the participation of the structural nitrogenase components and many accessory proteins, and occurs both in situ, for the P-cluster, and in external assembly sites for FeMo-co. The biosynthesis of FeMo-co is performed stepwise and involves molecular scaffolds, metallochaperones, radical chemistry, and novel and unique biosynthetic intermediates. This review provides a critical overview of discoveries on nitrogenase cofactor structure, function, and activity over the last four decades.
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Affiliation(s)
- Stefan Burén
- Centro
de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM), Instituto
Nacional de Investigación y Tecnología Agraria
y Alimentaria (INIA), Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Emilio Jiménez-Vicente
- Department
of Biochemistry, Virginia Polytechnic Institute, Blacksburg, Virginia 24061, United States
| | - Carlos Echavarri-Erasun
- Centro
de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM), Instituto
Nacional de Investigación y Tecnología Agraria
y Alimentaria (INIA), Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Luis M. Rubio
- Centro
de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM), Instituto
Nacional de Investigación y Tecnología Agraria
y Alimentaria (INIA), Pozuelo de Alarcón, 28223 Madrid, Spain
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8
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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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9
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Lin YW. Rational Design of Artificial Metalloproteins and Metalloenzymes with Metal Clusters. Molecules 2019; 24:E2743. [PMID: 31362341 PMCID: PMC6696605 DOI: 10.3390/molecules24152743] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 07/24/2019] [Accepted: 07/26/2019] [Indexed: 01/22/2023] Open
Abstract
Metalloproteins and metalloenzymes play important roles in biological systems by using the limited metal ions, complexes, and clusters that are associated with the protein matrix. The design of artificial metalloproteins and metalloenzymes not only reveals the structure and function relationship of natural proteins, but also enables the synthesis of artificial proteins and enzymes with improved properties and functions. Acknowledging the progress in rational design from single to multiple active sites, this review focuses on recent achievements in the design of artificial metalloproteins and metalloenzymes with metal clusters, including zinc clusters, cadmium clusters, iron-sulfur clusters, and copper-sulfur clusters, as well as noble metal clusters and others. These metal clusters were designed in both native and de novo protein scaffolds for structural roles, electron transfer, or catalysis. Some synthetic metal clusters as functional models of native enzymes are also discussed. These achievements provide valuable insights for deep understanding of the natural proteins and enzymes, and practical clues for the further design of artificial enzymes with functions comparable or even beyond those of natural counterparts.
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Affiliation(s)
- Ying-Wu Lin
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China.
- Laboratory of Protein Structure and Function, University of South China, Hengyang 421001, China.
- Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang 421001, China.
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10
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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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11
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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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12
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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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13
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Two 2D frameworks of inorganic-organic hybrids based on Keggin-type tungstogermanates and {Cu I (Cu II )-bimb} n polymer chains. INORG CHEM COMMUN 2018. [DOI: 10.1016/j.inoche.2018.06.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Falaise C, Moussawi MA, Floquet S, Abramov PA, Sokolov MN, Haouas M, Cadot E. Probing Dynamic Library of Metal-Oxo Building Blocks with γ-Cyclodextrin. J Am Chem Soc 2018; 140:11198-11201. [DOI: 10.1021/jacs.8b07525] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Clément Falaise
- Institut Lavoisier de Versailles, UVSQ, CNRS, Université Paris-Saclay, Versailles 78000, France
| | - Mhamad Aly Moussawi
- Institut Lavoisier de Versailles, UVSQ, CNRS, Université Paris-Saclay, Versailles 78000, France
| | - Sébastien Floquet
- Institut Lavoisier de Versailles, UVSQ, CNRS, Université Paris-Saclay, Versailles 78000, France
| | - Pavel A. Abramov
- Nikolaev Institute of Inorganic Chemistry SB RAS, Novosibirsk 630090, Russia
| | - Maxim N. Sokolov
- Nikolaev Institute of Inorganic Chemistry SB RAS, Novosibirsk 630090, Russia
| | - Mohamed Haouas
- Institut Lavoisier de Versailles, UVSQ, CNRS, Université Paris-Saclay, Versailles 78000, France
| | - Emmanuel Cadot
- Institut Lavoisier de Versailles, UVSQ, CNRS, Université Paris-Saclay, Versailles 78000, France
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15
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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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Korlepara DB, Bejagam KK, Balasubramanian S. Supramolecular Polymerization of N,N′,N″,N‴-tetra-(Tetradecyl)-1,3,6,8-pyrenetetracarboxamide: A Computational Study. J Phys Chem B 2017; 121:11492-11503. [DOI: 10.1021/acs.jpcb.7b10171] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Divya B. Korlepara
- Chemistry and Physics of Materials
Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Karteek K. Bejagam
- Chemistry and Physics of Materials
Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Sundaram Balasubramanian
- Chemistry and Physics of Materials
Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
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17
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Tümer F, Köse M, Tümer M. Synthesis, crystal structure and spectroscopic properties of ethanol solvated α-Keggin heteropolymolybdate. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.06.127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Bacterial PerO Permeases Transport Sulfate and Related Oxyanions. J Bacteriol 2017; 199:JB.00183-17. [PMID: 28461447 DOI: 10.1128/jb.00183-17] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 04/22/2017] [Indexed: 01/13/2023] Open
Abstract
Rhodobacter capsulatus synthesizes the high-affinity ABC transporters CysTWA and ModABC to specifically import the chemically related oxyanions sulfate and molybdate, respectively. In addition, R. capsulatus has the low-affinity permease PerO acting as a general oxyanion transporter, whose elimination increases tolerance to molybdate and tungstate. Although PerO-like permeases are widespread in bacteria, their function has not been examined in any other species to date. Here, we present evidence that PerO permeases from the alphaproteobacteria Agrobacterium tumefaciens, Dinoroseobacter shibae, Rhodobacter sphaeroides, and Sinorhizobium meliloti and the gammaproteobacterium Pseudomonas stutzeri functionally substitute for R. capsulatus PerO in sulfate uptake and sulfate-dependent growth, as shown by assimilation of radioactively labeled sulfate and heterologous complementation. Disruption of perO genes in A. tumefaciens, R. sphaeroides, and S. meliloti increased tolerance to tungstate and, in the case of R. sphaeroides, to molybdate, suggesting that heterometal oxyanions are common substrates of PerO permeases. This study supports the view that bacterial PerO permeases typically transport sulfate and related oxyanions and, hence, form a functionally conserved permease family.IMPORTANCE Despite the widespread distribution of PerO-like permeases in bacteria, our knowledge about PerO function until now was limited to one species, Rhodobacter capsulatus In this study, we showed that PerO proteins from diverse bacteria are functionally similar to the R. capsulatus prototype, suggesting that PerO permeases form a conserved family whose members transport sulfate and related oxyanions.
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Rousk K, Degboe J, Michelsen A, Bradley R, Bellenger JP. Molybdenum and phosphorus limitation of moss-associated nitrogen fixation in boreal ecosystems. THE NEW PHYTOLOGIST 2017; 214:97-107. [PMID: 27883187 DOI: 10.1111/nph.14331] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 10/15/2016] [Indexed: 05/27/2023]
Abstract
Biological nitrogen fixation (BNF) performed by moss-associated cyanobacteria is one of the main sources of new nitrogen (N) input in pristine, high-latitude ecosystems. Yet, the nutrients that limit BNF remain elusive. Here, we tested whether this important ecosystem function is limited by the availability of molybdenum (Mo), phosphorus (P), or both. BNF in dominant mosses was measured with the acetylene reduction assay (ARA) at different time intervals following Mo and P additions, in both laboratory microcosms with mosses from a boreal spruce forest and field plots in subarctic tundra. We further used a 15 N2 tracer technique to assess the ARA to N2 fixation conversion ratios at our subarctic site. BNF was up to four-fold higher shortly after the addition of Mo, in both the laboratory and field experiments. A similar positive response to Mo was found in moss colonizing cyanobacterial biomass. As the growing season progressed, nitrogenase activity became progressively more P limited. The ARA : 15 N2 ratios increased with increasing Mo additions. These findings show that N2 fixation activity as well as cyanobacterial biomass in dominant feather mosses from boreal forests and subarctic tundra are limited by Mo availability.
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Affiliation(s)
- Kathrin Rousk
- Department of Biology, Terrestrial Ecology Section, University of Copenhagen, Universitetsparken 15, 2100, Copenhagen, Denmark
- Center for Permafrost (CENPERM), University of Copenhagen, Øster Voldgade 10, 1350, Copenhagen, Denmark
| | - Jefferson Degboe
- Centre Sève, Département de Chimie, Université de Sherbrooke, Sherbrooke, J1K 2R1, QC, Canada
| | - Anders Michelsen
- Department of Biology, Terrestrial Ecology Section, University of Copenhagen, Universitetsparken 15, 2100, Copenhagen, Denmark
- Center for Permafrost (CENPERM), University of Copenhagen, Øster Voldgade 10, 1350, Copenhagen, Denmark
| | - Robert Bradley
- Département de Biologie, Université de Sherbrooke, Sherbrooke, J1K 2R1, QC, Canada
| | - Jean-Philippe Bellenger
- Centre Sève, Département de Chimie, Université de Sherbrooke, Sherbrooke, J1K 2R1, QC, Canada
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20
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Observation of gold sub-nanocluster nucleation within a crystalline protein cage. Nat Commun 2017; 8:14820. [PMID: 28300064 PMCID: PMC5357307 DOI: 10.1038/ncomms14820] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Accepted: 02/06/2017] [Indexed: 01/18/2023] Open
Abstract
Protein scaffolds provide unique metal coordination environments that promote biomineralization processes. It is expected that protein scaffolds can be developed to prepare inorganic nanomaterials with important biomedical and material applications. Despite many promising applications, it remains challenging to elucidate the detailed mechanisms of formation of metal nanoparticles in protein environments. In the present work, we describe a crystalline protein cage constructed by crosslinking treatment of a single crystal of apo-ferritin for structural characterization of the formation of sub-nanocluster with reduction reaction. The crystal structure analysis shows the gradual movement of the Au ions towards the centre of the three-fold symmetric channels of the protein cage to form a sub-nanocluster with accompanying significant conformational changes of the amino-acid residues bound to Au ions during the process. These results contribute to our understanding of metal core formation as well as interactions of the metal core with the protein environment. Proteins can template the synthesis of inorganic nanoparticles, but the formation mechanisms remain vague. Here, the authors directly observe, through a sequence of X-ray crystal structures, the stages of gold sub-nanocluster growth within the confined environment of a ferritin cage.
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21
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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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22
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Chen Q, Wang MM, Hu X, Chen XW, Wang JH. An octamolybdate-metal organic framework hybrid for the efficient adsorption of histidine-rich proteins. J Mater Chem B 2016; 4:6812-6819. [DOI: 10.1039/c6tb02090a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Incorporation of octamolybdate (Mo8O26) into the metal–organic framework, MIL-101(Cr), produces a novel hybrid. The covalent interactions of the Mo8O26 moiety in the hybrid with the N-terminal site and the multi-metal binding site of proteins offer favorable adsorption performance towards histidine-rich proteins.
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Affiliation(s)
- Qing Chen
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Meng-Meng Wang
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Xue Hu
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Xu-Wei Chen
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Jian-Hua Wang
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
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Liu E, Zhang YZ, Tan J, Yang C, Li L, Golen JA, Rheingold AL, Zhang G. Zn(II) and Co(III) metallosupramolecular assemblies derived from a rigid bis-Schiff base ligand. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.07.074] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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24
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Pessoa JC, Etcheverry S, Gambino D. Vanadium compounds in medicine. Coord Chem Rev 2015; 301:24-48. [PMID: 32226091 PMCID: PMC7094629 DOI: 10.1016/j.ccr.2014.12.002] [Citation(s) in RCA: 328] [Impact Index Per Article: 36.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 11/18/2014] [Accepted: 12/02/2014] [Indexed: 12/02/2022]
Abstract
Vanadium is a transition metal that, being ubiquitously distributed in soil, crude oil, water and air, also found roles in biological systems and is an essential element in most living beings. There are also several groups of organisms which accumulate vanadium, employing it in their biological processes. Vanadium being a biological relevant element, it is not surprising that many vanadium based therapeutic drugs have been proposed for the treatment of several types of diseases. Namely, vanadium compounds, in particular organic derivatives, have been proposed for the treatment of diabetes, of cancer and of diseases caused by parasites. In this work we review the medicinal applications proposed for vanadium compounds with particular emphasis on the more recent publications. In cells, partly due to the similarity of vanadate and phosphate, vanadium compounds activate numerous signaling pathways and transcription factors; this by itself potentiates application of vanadium-based therapeutics. Nevertheless, this non-specific bio-activity may also introduce several deleterious side effects as in addition, due to Fenton's type reactions or of the reaction with atmospheric O2, VCs may also generate reactive oxygen species, thereby introducing oxidative stress with consequences presently not well evaluated, particularly for long-term administration of vanadium to humans. Notwithstanding, the potential of vanadium compounds to treat type 2 diabetes is still an open question and therapies using vanadium compounds for e.g. antitumor and anti-parasitic related diseases remain promising.
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Affiliation(s)
- Joao Costa Pessoa
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Susana Etcheverry
- Cátedra de Bioquímica Patológica and CEQUINOR, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 115 1900 La Plata, Argentina
| | - Dinorah Gambino
- Cátedra de Química Inorgánica, Facultad de Química, Universidad de la República, Gral. Flores 2124, 11800 Montevideo, Uruguay
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25
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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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26
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Sap A, De Zitter E, Van Meervelt L, Parac-Vogt TN. Structural Characterization of the Complex between Hen Egg-White Lysozyme and Zr(IV) -Substituted Keggin Polyoxometalate as Artificial Protease. Chemistry 2015; 21:11692-5. [PMID: 26179600 DOI: 10.1002/chem.201501998] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Indexed: 11/11/2022]
Abstract
Successful co-crystallization of a noncovalent complex between hen egg-white lysozyme (HEWL) and the monomeric Zr(IV) -substituted Keggin polyoxometalate (POM) (Zr1 K1), (Et2 NH2)3 [Zr(PW11 O39)] (1), has been achieved, and its single-crystal X-ray structure has been determined. The dimeric Zr(IV) -substituted Keggin-type polyoxometalate (Zr1 K2), (Et2 NH2)10 [Zr(PW11 O39 )2] (2), has been previously shown to exhibit remarkable selectivity towards HEWL hydrolysis. The reported X-ray structure shows that the hydrolytically active Zr(IV) -substituted Keggin POM exists as a monomeric species. Prior to hydrolysis, this monomer interacts with HEWL in the vicinity of the previously identified cleavage sites found at Trp28-Val29 and Asn44-Arg45, through water-mediated H-bonding and electrostatic interactions. Three binding sites are observed at the interface of the negatively charged Keggin POM and the positively charged regions of HEWL at: 1) Gly16, Tyr20, and Arg21; 2) Asn44, Arg45, and Asn46; and 3) Arg128.
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Affiliation(s)
- Annelies Sap
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F box 2404, 3001 Leuven, Heverlee (Belgium)
| | - Elke De Zitter
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F box 2404, 3001 Leuven, Heverlee (Belgium)
| | - Luc Van Meervelt
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F box 2404, 3001 Leuven, Heverlee (Belgium)
| | - Tatjana N Parac-Vogt
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F box 2404, 3001 Leuven, Heverlee (Belgium).
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27
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Garai S, Rubčić M, Bögge H, Gouzerh P, Müller A. Porous Capsules with a Large Number of Active Sites: Nucleation/Growth under Confined Conditions. Chemistry 2015; 21:4321-5. [DOI: 10.1002/chem.201406191] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Indexed: 11/06/2022]
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28
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Bijelic A, Molitor C, Mauracher SG, Al-Oweini R, Kortz U, Rompel A. Hen egg-white lysozyme crystallisation: protein stacking and structure stability enhanced by a Tellurium(VI)-centred polyoxotungstate. Chembiochem 2015; 16:233-41. [PMID: 25521080 PMCID: PMC4498469 DOI: 10.1002/cbic.201402597] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Indexed: 01/24/2023]
Abstract
As synchrotron radiation becomes more intense, detectors become faster and structure-solving software becomes more elaborate, obtaining single crystals suitable for data collection is now the bottleneck in macromolecular crystallography. Hence, there is a need for novel and advanced crystallisation agents with the ability to crystallise proteins that are otherwise challenging. Here, an Anderson-Evans-type polyoxometalate (POM), specifically Na6 [TeW6 O24 ]⋅22 H2 O (TEW), is employed as a crystallisation additive. Its effects on protein crystallisation are demonstrated with hen egg-white lysozyme (HEWL), which co-crystallises with TEW in the vicinity (or within) the liquid-liquid phase separation (LLPS) region. The X-ray structure (PDB ID: 4PHI) determination revealed that TEW molecules are part of the crystal lattice, thus demonstrating specific binding to HEWL with electrostatic interactions and hydrogen bonds. The negatively charged TEW polyoxotungstate binds to sites with a positive electrostatic potential located between two (or more) symmetry-related protein chains. Thus, TEW facilitates the formation of protein-protein interfaces of otherwise repulsive surfaces, and thereby the realisation of a stable crystal lattice. In addition to retaining the isomorphicity of the protein structure, the anomalous scattering of the POMs was used for macromolecular phasing. The results suggest that hexatungstotellurate(VI) has great potential as a crystallisation additive to promote both protein crystallisation and structure elucidation.
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Affiliation(s)
- Aleksandar Bijelic
- Institut für Biophysikalische Chemie, Fakultät für Chemie, Universität WienAlthanstrasse 14, 1090 Wien (Austria) E-mail:
| | - Christian Molitor
- Institut für Biophysikalische Chemie, Fakultät für Chemie, Universität WienAlthanstrasse 14, 1090 Wien (Austria) E-mail:
| | - Stephan G Mauracher
- Institut für Biophysikalische Chemie, Fakultät für Chemie, Universität WienAlthanstrasse 14, 1090 Wien (Austria) E-mail:
| | - Rami Al-Oweini
- School of Engineering and Science, Jacobs UniversityP. O. Box 750 561, 28725 Bremen (Germany)
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs UniversityP. O. Box 750 561, 28725 Bremen (Germany)
| | - Annette Rompel
- Institut für Biophysikalische Chemie, Fakultät für Chemie, Universität WienAlthanstrasse 14, 1090 Wien (Austria) E-mail:
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29
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Chen Q, Zhang DD, Wang MM, Chen XW, Wang JH. A novel organic–inorganic hybrid polyoxometalate for the selective adsorption/isolation of β-lactoglobulin. J Mater Chem B 2015; 3:6964-6970. [DOI: 10.1039/c5tb01298h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A novel polyoxometalate (POM)-based organic–inorganic hybrid is preparedviaa one-pot hydrothermal reaction between Keggin POM and a star-like N-donor ligand. The hybrid exhibits excellent adsorption performance towards β-lactoglobulin with a favorable sorption capacity.
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Affiliation(s)
- Qing Chen
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Dan-Dan Zhang
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Meng-Meng Wang
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Xu-Wei Chen
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Jian-Hua Wang
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
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30
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Wang Y, Jiang N, Li F, Zheng Y, Xu L, Sun M. Unusual assembly of lacunary heteropolymolybdates with cyanometalate fragment. Dalton Trans 2014; 43:16147-51. [PMID: 25119264 DOI: 10.1039/c4dt01875c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two new cyanide-bridged heteropolymolybdate complexes have been synthesized by a facile self-assembly process in aqueous solution, which demonstrates a successful tactic to incorporate the cyanometalate fragment into lacunary heteropolymolybdate. Magnetic investigation showed that complex 2 exhibits slow magnetic relaxation behavior.
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Affiliation(s)
- Ya Wang
- Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun 130024, P. R. China.
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31
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Li XX, Fang WH, Zhao JW, Yang GY. Hydrothermal Combination of Trilacunary Dawson Phosphotungstates and Hexanickel Clusters: From an Isolated Cluster to a 3D Framework. Chemistry 2014; 20:17324-32. [DOI: 10.1002/chem.201404384] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2014] [Indexed: 11/08/2022]
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32
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Yan Y, Liu B, Yu C, Zhang X, Hu H, Xue G. Extended architecture formed by linkage of a new type of decamolybdate {Mo10O34} unit and Cu3 cluster. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.09.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Mauracher SG, Molitor C, Al-Oweini R, Kortz U, Rompel A. Latent and active abPPO4 mushroom tyrosinase cocrystallized with hexatungstotellurate(VI) in a single crystal. ACTA CRYSTALLOGRAPHICA. SECTION D, BIOLOGICAL CRYSTALLOGRAPHY 2014; 70:2301-15. [PMID: 25195745 PMCID: PMC4157443 DOI: 10.1107/s1399004714013777] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 06/12/2014] [Indexed: 01/08/2023]
Abstract
Tyrosinases, bifunctional metalloenzymes, catalyze the oxidation of monophenols and o-diphenols to o-quinones, the precursor compounds of the brown-coloured pigment melanin. In eukaryotic organisms, tyrosinases are expressed as latent zymogens that have to be proteolytically cleaved in order to form highly active enzymes. This activation mechanism, known as the tyrosinase maturation process, has scientific and industrial significance with respect to biochemical and technical applications of the enzyme. Here, not only the first crystal structure of the mushroom tyrosinase abPPO4 is presented in its active form (Ser2-Ser383) and in its 21 kDa heavier latent form (Ser2-Thr545), but furthermore the simultaneous presence of both forms within one single-crystal structure is shown. This allows for a simple approach to investigate the transition between these two forms. Isoform abPPO4 was isolated and extensively purified from the natural source (Agaricus bisporus), which contains a total of six polyphenol oxidases (PPOs). The enzyme formed crystals (diffracting to a resolution of 2.76 Å) owing to the employment of the 6-tungstotellurate(VI) salt (Na6[TeW6O24]·22H2O) as a cocrystallization agent. Two of these disc-shaped Anderson-type polyoxoanions [TeW6O24](6-) separate two asymmetric units comprising one crystallographic heterodimer of abPPO4, thus resulting in very interesting crystal packing.
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Affiliation(s)
- Stephan Gerhard Mauracher
- Institut für Biophysikalische Chemie, Fakultät für Chemie, Universität Wien, Althanstrasse 14, 1090 Wien, Austria
| | - Christian Molitor
- Institut für Biophysikalische Chemie, Fakultät für Chemie, Universität Wien, Althanstrasse 14, 1090 Wien, Austria
| | - Rami Al-Oweini
- School of Engineering and Science, Jacobs University, PO Box 750 561, 28725 Bremen, Germany
| | - Ulrich Kortz
- School of Engineering and Science, Jacobs University, PO Box 750 561, 28725 Bremen, Germany
| | - Annette Rompel
- Institut für Biophysikalische Chemie, Fakultät für Chemie, Universität Wien, Althanstrasse 14, 1090 Wien, Austria
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34
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Chen Q, Shen LM, Xia J, Chen XW, Wang JH. Preparation of Keggin-type phosphomolybdate by a one-step solid-state reaction at room temperature and its application in protein adsorption. J Sep Sci 2014; 37:2716-23. [DOI: 10.1002/jssc.201400401] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Revised: 06/11/2014] [Accepted: 07/01/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Qing Chen
- Research Center for Analytical Sciences; College of Sciences; Northeastern University; Shenyang China
| | - Li-Ming Shen
- Research Center for Analytical Sciences; College of Sciences; Northeastern University; Shenyang China
| | - Jie Xia
- Research Center for Analytical Sciences; College of Sciences; Northeastern University; Shenyang China
| | - Xu-Wei Chen
- Research Center for Analytical Sciences; College of Sciences; Northeastern University; Shenyang China
| | - Jian-Hua Wang
- Research Center for Analytical Sciences; College of Sciences; Northeastern University; Shenyang China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin China
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35
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Poppe J, Warkentin E, Demmer U, Kowalewski B, Dierks T, Schneider K, Ermler U. Structural diversity of polyoxomolybdate clusters along the three-fold axis of the molybdenum storage protein. J Inorg Biochem 2014; 138:122-128. [PMID: 24945101 DOI: 10.1016/j.jinorgbio.2014.05.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 05/06/2014] [Accepted: 05/06/2014] [Indexed: 10/25/2022]
Abstract
The molybdenum storage protein (MoSto) can store more than 100 Mo or W atoms as discrete polyoxometalate (POM) clusters. Here, we describe the three POM cluster sites along the threefold axis of the protein complex based on four X-ray structures with slightly different polyoxomolybdate compositions between 1.35 and 2 Å resolution. In contrast to the Moα-out binding site occupied by an Mo3 cluster, the Moα-in and Moβ binding sites contain rather weak and non-uniform electron density for the Mo atoms (but clearly identifiable by anomalous data), suggesting the presence of POM cluster ensembles and/or degradation products of larger aggregates. The "Moα-in cluster ensemble" was interpreted as an antiprism-like Mo6 species superimposed with an Mo7 pyramide and the "Moβ cluster ensemble" as an Mo13 cluster (present mostly in a degraded form) composed of a pyramidal Mo7 and a Mo3 building block linked by three spatially separated MoOx units. Inside the ball-shaped Mo13 cluster sits an occluded central atom, perhaps a metal ion. POM cluster formation at the Moα-in and Moβ sites appears to be driven by filtering out and binding/protecting self-assembled transient species complementary to the protein template.
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Affiliation(s)
- Juliane Poppe
- Max-Planck-Institut für Biophysik, Max-von-Laue-Straße 3, D-60438 Frankfurt am Main, Germany
| | - Eberhard Warkentin
- Max-Planck-Institut für Biophysik, Max-von-Laue-Straße 3, D-60438 Frankfurt am Main, Germany
| | - Ulrike Demmer
- Max-Planck-Institut für Biophysik, Max-von-Laue-Straße 3, D-60438 Frankfurt am Main, Germany
| | - Björn Kowalewski
- Biochemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
| | - Thomas Dierks
- Biochemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
| | - Klaus Schneider
- Biochemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany.
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik, Max-von-Laue-Straße 3, D-60438 Frankfurt am Main, Germany.
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Abstract
Vanadium is the 21st most abundant element in the Earth's crust and the 2nd-to-most abundant transition metal in sea water. The element is ubiquitous also in freshwater and nutrients. The average body load of a human individual amounts to 1 mg. The omnipresence of vanadium hampers checks directed towards its essentiality. However, since vanadate can be considered a close blueprint of phosphate with respect to its built-up, vanadate likely takes over a regulatory function in metabolic processes depending on phosphate. At common concentrations, vanadium is non-toxic. The main source for potentially toxic effects caused by vanadium is exposure to high loads of vanadium oxides in the breathing air of vanadium processing industrial enterprises. Vanadium can enter the body via the lungs or, more commonly, the stomach. Most of the dietary vanadium is excreted. The amount of vanadium resorbed in the gastrointestinal tract is a function of its oxidation state (V(V) or V(IV)) and the coordination environment. Vanadium compounds that enter the blood stream are subjected to speciation. The predominant vanadium species in blood are vanadate and vanadyl bound to transferrin. From the blood stream, vanadium becomes distributed to the body tissues and bones. Bones act as storage pool for vanadate. The aqueous chemistry of vanadium(V) at concentration <10 μM is dominated by vanadate. At higher concentrations, oligovanadates come in, decavanadate in particular, which is thermodynamically stable in the pH range 2.3-6.3, and can further be stabilized at higher pH by interaction with proteins.The similarity between vanadate and phosphate accounts for the interplay between vanadate and phosphate-dependent enzymes: phosphatases can be inhibited, kinases activated. As far as medicinal applications of vanadium compounds are concerned, vanadium's mode of action appears to be related to the phosphate-vanadate antagonism, to the direct interaction of vanadium compounds or fragments thereof with DNA, and to vanadium's contribution to a balanced tissue level of reactive oxygen species. So far vanadium compounds have not yet found approval for medicinal applications. The antidiabetic (insulin-enhancing) effect, however, of a singular vanadium complex, bis(ethylmaltolato)oxidovanadium(IV) (BEOV), has revealed encouraging results in phase IIa clinical tests. In addition, in vitro studies with cell cultures and parasites, as well as in vivo studies with animals, have revealed a broad potential spectrum for the application of vanadium coordination compounds in the treatment of cardiac and neuronal disorders, malignant tumors, viral and bacterial infections (such as influenza, HIV, and tuberculosis), and tropical diseases caused by parasites, e.g., Chagas' disease, leishmaniasis, and amoebiasis.
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Affiliation(s)
- Astrid Sigel
- Dept. of Chemistry, Inorganic Chemistry, University of Basel, Basel, Basel Stadt Switzerland
| | - Helmut Sigel
- Department of Chemistry, Inorganic Chemistry, University of Basel, Basel, Switzerland
| | - Roland K.O. Sigel
- Institute of Inorganic Chemistry, University of Zürich, Zürich, Zürich Switzerland
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Müller A, Merca A, Al-Karawi AJM, Garai S, Bögge H, Hou G, Wu L, Haupt ETK, Rehder D, Haso F, Liu T. Chemical Adaptability: The Integration of Different Kinds of Matter into Giant Molecular Metal Oxides. Chemistry 2012. [DOI: 10.1002/chem.201203186] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kowalewski B, Poppe J, Demmer U, Warkentin E, Dierks T, Ermler U, Schneider K. Nature's polyoxometalate chemistry: X-ray structure of the Mo storage protein loaded with discrete polynuclear Mo-O clusters. J Am Chem Soc 2012; 134:9768-74. [PMID: 22612644 DOI: 10.1021/ja303084n] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Some N(2)-fixing bacteria prolong the functionality of nitrogenase in molybdenum starvation by a special Mo storage protein (MoSto) that can store more than 100 Mo atoms. The presented 1.6 Å X-ray structure of MoSto from Azotobacter vinelandii reveals various discrete polyoxomolybdate clusters, three covalently and three noncovalently bound Mo(8), three Mo(5-7), and one Mo(3) clusters, and several low occupied, so far undefinable clusters, which are embedded in specific pockets inside a locked cage-shaped (αβ)(3) protein complex. The structurally identical Mo(8) clusters (three layers of two, four, and two MoO(n) octahedra) are distinguishable from the [Mo(8)O(26)](4-) cluster formed in acidic solutions by two displaced MoO(n) octahedra implicating three kinetically labile terminal ligands. Stabilization in the covalent Mo(8) cluster is achieved by Mo bonding to Hisα156-N(ε2) and Gluα129-O(ε1). The absence of covalent protein interactions in the noncovalent Mo(8) cluster is compensated by a more extended hydrogen-bond network involving three pronounced histidines. One displaced MoO(n) octahedron might serve as nucleation site for an inhomogeneous Mo(5-7) cluster largely surrounded by bulk solvent. In the Mo(3) cluster located on the 3-fold axis, the three accurately positioned His140-N(ε2) atoms of the α subunits coordinate to the Mo atoms. The formed polyoxomolybdate clusters of MoSto, not detectable in bulk solvent, are the result of an interplay between self- and protein-driven assembly processes that unite inorganic supramolecular and protein chemistry in a host-guest system. Template, nucleation/protection, and catalyst functions of the polypeptide as well as perspectives for designing new clusters are discussed.
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Affiliation(s)
- Björn Kowalewski
- Biochemie I, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
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Müller A, Gouzerh P. From linking of metal-oxide building blocks in a dynamic library to giant clusters with unique properties and towards adaptive chemistry. Chem Soc Rev 2012; 41:7431-63. [DOI: 10.1039/c2cs35169b] [Citation(s) in RCA: 299] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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41
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Li XX, Zheng ST, Zhang J, Fang WH, Yang GY, Clemente-Juan JM. High-Nuclearity Ni-Substituted Polyoxometalates: A Series of Poly(polyoxotungstate)s Containing 20-22 Nickel Centers. Chemistry 2011; 17:13032-43. [DOI: 10.1002/chem.201101496] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Haak RM, Decortes A, Escudero-Adán EC, Belmonte MM, Martin E, Benet-Buchholz J, Kleij AW. Shape-Persistent Octanuclear Zinc Salen Clusters: Synthesis, Characterization, and Catalysis. Inorg Chem 2011; 50:7934-6. [DOI: 10.1021/ic201064d] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Robert M. Haak
- Institute of Chemical Research of Catalonia (ICIQ), Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Antonello Decortes
- Institute of Chemical Research of Catalonia (ICIQ), Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Eduardo C. Escudero-Adán
- Institute of Chemical Research of Catalonia (ICIQ), Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Marta Martínez Belmonte
- Institute of Chemical Research of Catalonia (ICIQ), Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Eddy Martin
- Institute of Chemical Research of Catalonia (ICIQ), Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Jordi Benet-Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Arjan W. Kleij
- Institute of Chemical Research of Catalonia (ICIQ), Avenida Països Catalans 16, 43007 Tarragona, Spain
- Catalan Institute for Research and Advanced Studies (ICREA), Pg. Lluís Companys 23, 08010 Barcelona, Spain
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Weinstock IA, Müller A. Oxo-Metalate Building Blocks: Conceptual Competitors for Tetravalent Carbon? Isr J Chem 2011. [DOI: 10.1002/ijch.201100037] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Berardi S, Carraro M, Sartorel A, Modugno G, Bonchio M. Hybrid Polyoxometalates: Merging Organic and Inorganic Domains for Enhanced Catalysis and Energy Applications. Isr J Chem 2011. [DOI: 10.1002/ijch.201100018] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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45
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Raunest M, Kandt C. dxTuber: detecting protein cavities, tunnels and clefts based on protein and solvent dynamics. J Mol Graph Model 2011; 29:895-905. [PMID: 21420887 DOI: 10.1016/j.jmgm.2011.02.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Revised: 02/04/2011] [Accepted: 02/14/2011] [Indexed: 10/18/2022]
Abstract
Empty space in a protein structure can provide valuable insight into protein properties such as internal hydration, structure stabilization, substrate translocation, storage compartments or binding sites. This information can be visualized by means of cavity analysis. Numerous tools are available depicting cavities directly or identifying lining residues. So far, all available techniques base on a single conformation neglecting any form of protein and cavity dynamics. Here we report a novel, grid-based cavity detection method that uses protein and solvent residence probabilities derived from molecular dynamics simulations to identify (I) internal cavities, (II) tunnels or (III) clefts on the protein surface. Driven by a graphical user interface, output can be exported in PDB format where cavities are described as individually selectable groups of adjacent voxels representing regions of high solvent residence probability. Cavities can be analyzed in terms of solvent density, cavity volume and cross-sectional area along a principal axis. To assess dxTuber performance we performed test runs on a set of six example proteins representing the three main classes of protein cavities and compared our findings to results obtained with SURFNET, CAVER and PyMol.
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Affiliation(s)
- Martin Raunest
- Computational Structural Biology, Department of Life Science Informatics, B-IT, Life & Medical Sciences (LIMES) Center, University of Bonn, Dahlmannstr 2, 53113 Bonn, Germany
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Thorimbert S, Hasenknopf B, Lacôte E. Cross-Linking Organic and Polyoxometalate Chemistries. Isr J Chem 2011. [DOI: 10.1002/ijch.201000080] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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48
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Zerkle AL, Scheiderich K, Maresca JA, Liermann LJ, Brantley SL. Molybdenum isotope fractionation by cyanobacterial assimilation during nitrate utilization and N₂ fixation. GEOBIOLOGY 2011; 9:94-106. [PMID: 21092069 PMCID: PMC3627308 DOI: 10.1111/j.1472-4669.2010.00262.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2010] [Accepted: 10/14/2010] [Indexed: 05/30/2023]
Abstract
We measured the δ⁹⁸Mo of cells and media from molybdenum (Mo) assimilation experiments with the freshwater cyanobacterium Anabaena variabilis, grown with nitrate as a nitrogen (N) source or fixing atmospheric N₂. This organism uses a Mo-based nitrate reductase during nitrate utilization and a Mo-based dinitrogenase during N₂ fixation under culture conditions here. We also demonstrate that it has a high-affinity Mo uptake system (ModABC) similar to other cyanobacteria, including marine N₂-fixing strains. Anabaena variabilis preferentially assimilated light isotopes of Mo in all experiments, resulting in fractionations of -0.2‰ to -1.0‰ ± 0.2‰ between cells and media (ε(cells-media)), extending the range of biological Mo fractionations previously reported. The fractionations were internally consistent within experiments, but varied with the N source utilized and for different growth phases sampled. During growth on nitrate, A. variabilis consistently produced fractionations of -0.3 ± 0.1‰ (mean ± standard deviation between experiments). When fixing N₂, A. variabilis produced fractionations of -0.9 ± 0.1‰ during exponential growth, and -0.5 ± 0.1‰ during stationary phase. This pattern is inconsistent with a simple kinetic isotope effect associated with Mo transport, because Mo is likely transported through the ModABC uptake system under all conditions studied. We present a reaction network model for Mo isotope fractionation that demonstrates how Mo transport and storage, coordination changes during enzymatic incorporation, and the distribution of Mo inside the cell could all contribute to the total biological fractionations. Additionally, we discuss the potential importance of biologically incorporated Mo to organic matter-bound Mo in marine sediments.
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Affiliation(s)
- A L Zerkle
- Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland, USA.
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Meng X, Qin C, Wang XL, Su ZM, Li B, Yang QH. Chiral salen-metal derivatives of polyoxometalates with asymmetric catalytic and photocatalytic activities. Dalton Trans 2011; 40:9964-6. [DOI: 10.1039/c1dt11227a] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Mitchell SG, Boyd T, Miras HN, Long DL, Cronin L. Extended Polyoxometalate Framework Solids: Two Mn(II)-Linked {P8W48} Network Arrays. Inorg Chem 2010; 50:136-43. [DOI: 10.1021/ic101472s] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Scott G. Mitchell
- WestCHEM, School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, Scotland, U.K
| | - Thomas Boyd
- WestCHEM, School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, Scotland, U.K
| | - Haralampos N. Miras
- WestCHEM, School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, Scotland, U.K
| | - De-Liang Long
- WestCHEM, School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, Scotland, U.K
| | - Leroy Cronin
- WestCHEM, School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, Scotland, U.K
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