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Kurz L, Schmieder P, Veiga N, Fiedler D. One Scaffold, Two Conformations: The Ring-Flip of the Messenger InsP8 Occurs under Cytosolic Conditions. Biomolecules 2023; 13:biom13040645. [PMID: 37189392 DOI: 10.3390/biom13040645] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/27/2023] [Accepted: 03/30/2023] [Indexed: 04/07/2023] Open
Abstract
Inositol poly- and pyrophosphates (InsPs and PP-InsPs) are central eukaryotic messengers. These very highly phosphorylated molecules can exist in two distinct conformations, a canonical one with five phosphoryl groups in equatorial positions, and a “flipped” conformation with five axial substituents. Using 13C-labeled InsPs/PP-InsPs, the behavior of these molecules was investigated by 2D-NMR under solution conditions reminiscent of a cytosolic environment. Remarkably, the most highly phosphorylated messenger 1,5(PP)2-InsP4 (also termed InsP8) readily adopts both conformations at physiological conditions. Environmental factors—such as pH, metal cation composition, and temperature—strongly influence the conformational equilibrium. Thermodynamic data revealed that the transition of InsP8 from the equatorial to the axial conformation is, in fact, an exothermic process. The speciation of InsPs and PP-InsPs also affects their interaction with protein binding partners; addition of Mg2+ decreased the binding constant Kd of InsP8 to an SPX protein domain. The results illustrate that PP-InsP speciation reacts very sensitively to solution conditions, suggesting it might act as an environment-responsive molecular switch.
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Affiliation(s)
- Leonie Kurz
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Robert-Rössle-Straße 10, 13125 Berlin, Germany
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
| | - Peter Schmieder
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Robert-Rössle-Straße 10, 13125 Berlin, Germany
| | - Nicolás Veiga
- Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República (UdelaR), Av. Gral. Flores 2124, Montevideo 11800, Uruguay
| | - Dorothea Fiedler
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Robert-Rössle-Straße 10, 13125 Berlin, Germany
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
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2
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Duel P, Piña MDLN, Morey J. One-Pot Environmentally Friendly Synthesis of Nanomaterials Based on Phytate-Coated Fe 3O 4 Nanoparticles for Efficient Removal of the Radioactive Metal Ions 90Sr, 90Y and (UO 2) 2+ from Water. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:4383. [PMID: 36558236 PMCID: PMC9781934 DOI: 10.3390/nano12244383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/07/2022] [Accepted: 12/07/2022] [Indexed: 06/17/2023]
Abstract
We report the fast (three minutes) synthesis of green nanoparticles based on nanoparticles coated with the natural organic receptor phytate for the recognition and capture of 90Sr, 90Y, and (UO2)2+. The new material shows excellent retention for (UO2)2+, 97%; these values were 73% and 100% for 90Sr and 90Y, respectively. Recovery of the three radioactive metal ions occurs through a non-competitive process. The new hybrid material is harmless, easy to prepare, and immobilizes these radioactive contaminants in water with great efficiency.
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Asensio G, Hernández-Arriaga AM, Martín-Del-Campo M, Prieto MA, Rojo L, Vázquez-Lasa B. A study on Sr/Zn phytate complexes: structural properties and antimicrobial synergistic effects against Streptococcus mutans. Sci Rep 2022; 12:20177. [PMID: 36418367 PMCID: PMC9684506 DOI: 10.1038/s41598-022-24300-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 11/14/2022] [Indexed: 11/25/2022] Open
Abstract
Phytic acid (PA) is an abundant natural plant component that exhibits a versatility of applications benefited from its chemical structure, standing out its use as food, packing and dental additive due to its antimicrobial properties. The capacity of PA to chelate ions is also well-established and the formation and thermodynamic properties of different metallic complexes has been described. However, research studies of these compounds in terms of chemistry and biological features are still demanded in order to extend the application scope of PA complexes. The main goal of this paper is to deepen in the knowledge of the bioactive metal complexes chemistry and their bactericide activity, to extend their application in biomaterial science, specifically in oral implantology. Thus, this work presents the synthesis and structural assessment of two metallic phytate complexes bearing the bioactive cations Zn2+ and Sr2+ (ZnPhy and SrPhy respectively), along with studies on the synergic biological properties between PA and cations. Metallic phytates were synthesized in the solid-state by hydrothermal reaction leading to pure solid compounds in high yields. Their molecular formulas were C6H12024P6Sr4·5H2O and C6H12024P6Zn6·6H2O, as determined by ICP and HRES-TGA. The metal coordination bond of the solid complexes was further analysed by EDS, Raman, ATR-FTIR and solid 13C and 31P-NMR spectroscopies. Likewise, we evaluated the in vitro ability of the phytate compounds for inhibiting biofilm production of Streptococcus mutans cultures. Results indicate that all compounds significantly reduced biofilm formation (PA < SrPhy < ZnPhy), and ZnPhy even showed remarkable differences with respect to PA and SrPhy. Analysis of antimicrobial properties shows the first clues of the possible synergic effects created between PA and the corresponding cation in different cell metabolic processes. In overall, findings of this work can contribute to expand the applications of these bioactive metallic complexes in the biotechnological and biomedical fields, and they can be considered for the fabrication of anti-plaque coating systems in the dentistry field.
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Affiliation(s)
- Gerardo Asensio
- Instituto de Ciencia y Tecnología de Polímeros, (ICTP), CSIC, C/ Juan de la Cierva, 3, 28006, Madrid, Spain
| | - Ana M Hernández-Arriaga
- Centro de Investigaciones Biológicas - Margarita Salas (CIB-Margarita Salas), CSIC, C/ Ramiro de Maeztu, 9, 28040, Madrid, Spain
- Interdisciplinary Platform for Sustainable Plastics Towards a Circular Economy-Spanish National Research Council (SusPlast-CSIC), Madrid, Spain
| | - Marcela Martín-Del-Campo
- Instituto de Ciencia y Tecnología de Polímeros, (ICTP), CSIC, C/ Juan de la Cierva, 3, 28006, Madrid, Spain
- Facultad de Estomatología, Universidad Autónoma San Luis Potosí, Avenida Dr. Manuel Nava, 2, 78290, San Luis, México
| | - M Auxiliadora Prieto
- Centro de Investigaciones Biológicas - Margarita Salas (CIB-Margarita Salas), CSIC, C/ Ramiro de Maeztu, 9, 28040, Madrid, Spain
- Interdisciplinary Platform for Sustainable Plastics Towards a Circular Economy-Spanish National Research Council (SusPlast-CSIC), Madrid, Spain
| | - Luis Rojo
- Instituto de Ciencia y Tecnología de Polímeros, (ICTP), CSIC, C/ Juan de la Cierva, 3, 28006, Madrid, Spain.
- Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Madrid, Spain.
- Interdisciplinary Platform for Sustainable Plastics Towards a Circular Economy-Spanish National Research Council (SusPlast-CSIC), Madrid, Spain.
| | - Blanca Vázquez-Lasa
- Instituto de Ciencia y Tecnología de Polímeros, (ICTP), CSIC, C/ Juan de la Cierva, 3, 28006, Madrid, Spain
- Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Madrid, Spain
- Interdisciplinary Platform for Sustainable Plastics Towards a Circular Economy-Spanish National Research Council (SusPlast-CSIC), Madrid, Spain
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4
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Hostachy S, Utesch T, Franke K, Dornan GL, Furkert D, Türkaydin B, Haucke V, Sun H, Fiedler D. Dissecting the activation of insulin degrading enzyme by inositol pyrophosphates and their bisphosphonate analogs. Chem Sci 2021; 12:10696-10702. [PMID: 34476054 PMCID: PMC8372538 DOI: 10.1039/d1sc02975d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 07/06/2021] [Indexed: 11/21/2022] Open
Abstract
Inositol poly- and pyrophosphates (InsPs and PP-InsPs) are densely phosphorylated eukaryotic messengers, which are involved in numerous cellular processes. To elucidate their signaling functions at the molecular level, non-hydrolyzable bisphosphonate analogs of inositol pyrophosphates, PCP-InsPs, have been instrumental. Here, an efficient synthetic strategy to obtain these analogs in unprecedented quantities is described - relying on the use of combined phosphate ester-phosphoramidite reagents. The PCP-analogs, alongside their natural counterparts, were applied to investigate their regulatory effect on insulin-degrading enzyme (IDE), using a range of biochemical, biophysical and computational methods. A unique interplay between IDE, its substrates and the PP-InsPs was uncovered, in which the PP-InsPs differentially modulated the activity of the enzyme towards short peptide substrates. Aided by molecular docking and molecular dynamics simulations, a flexible binding mode for the InsPs/PP-InsPs was identified at the anion binding site of IDE. Targeting IDE for therapeutic purposes should thus take regulation by endogenous PP-InsP metabolites into account.
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Affiliation(s)
- Sarah Hostachy
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) Robert-Rössle Str. 10 13125 Berlin Germany
| | - Tillmann Utesch
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) Robert-Rössle Str. 10 13125 Berlin Germany
| | - Katy Franke
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) Robert-Rössle Str. 10 13125 Berlin Germany
| | - Gillian Leigh Dornan
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) Robert-Rössle Str. 10 13125 Berlin Germany
| | - David Furkert
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) Robert-Rössle Str. 10 13125 Berlin Germany
- Institut für Chemie, Humboldt-Universität zu Berlin Brook-Taylor-Straße 2 12489 Berlin Germany
| | - Berke Türkaydin
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) Robert-Rössle Str. 10 13125 Berlin Germany
| | - Volker Haucke
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) Robert-Rössle Str. 10 13125 Berlin Germany
| | - Han Sun
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) Robert-Rössle Str. 10 13125 Berlin Germany
| | - Dorothea Fiedler
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) Robert-Rössle Str. 10 13125 Berlin Germany
- Institut für Chemie, Humboldt-Universität zu Berlin Brook-Taylor-Straße 2 12489 Berlin Germany
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5
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Analytical Methods for Determination of Phytic Acid and Other Inositol Phosphates: A Review. Molecules 2020; 26:molecules26010174. [PMID: 33396544 PMCID: PMC7795710 DOI: 10.3390/molecules26010174] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 12/28/2020] [Accepted: 12/29/2020] [Indexed: 12/12/2022] Open
Abstract
From the early precipitation-based techniques, introduced more than a century ago, to the latest development of enzymatic bio- and nano-sensor applications, the analysis of phytic acid and/or other inositol phosphates has never been a straightforward analytical task. Due to the biomedical importance, such as antinutritional, antioxidant and anticancer effects, several types of methodologies were investigated over the years to develop a reliable determination of these intriguing analytes in many types of biological samples; from various foodstuffs to living cell organisms. The main aim of the present work was to critically overview the development of the most relevant analytical principles, separation and detection methods that have been applied in order to overcome the difficulties with specific chemical properties of inositol phosphates, their interferences, absence of characteristic signal (e.g., absorbance), and strong binding interactions with (multivalent) metals and other biological molecules present in the sample matrix. A systematical and chronological review of the applied methodology and the detection system is given, ranging from the very beginnings of the classical gravimetric and titrimetric analysis, through the potentiometric titrations, chromatographic and electrophoretic separation techniques, to the use of spectroscopic methods and of the recently reported fluorescence and voltammetric bio- and nano-sensors.
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6
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Madsen CK, Brinch-Pedersen H. Globoids and Phytase: The Mineral Storage and Release System in Seeds. Int J Mol Sci 2020; 21:ijms21207519. [PMID: 33053867 PMCID: PMC7589363 DOI: 10.3390/ijms21207519] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 10/07/2020] [Accepted: 10/09/2020] [Indexed: 01/08/2023] Open
Abstract
Phytate and phytases in seeds are the subjects of numerous studies, dating back as far as the early 20th century. Most of these studies concern the anti-nutritional properties of phytate, and the prospect of alleviating the effects of phytate with phytase. As reasonable as this may be, it has led to a fragmentation of knowledge, which hampers the appreciation of the physiological system at hand. In this review, we integrate the existing knowledge on the chemistry and biosynthesis of phytate, the globoid cellular structure, and recent advances on plant phytases. We highlight that these components make up a system that serves to store and-in due time-release the seed's reserves of the mineral nutrients phosphorous, potassium, magnesium, and others, as well as inositol and protein. The central component of the system, the phytate anion, is inherently rich in phosphorous and inositol. The chemical properties of phytate enable it to sequester additional cationic nutrients. Compartmentalization and membrane transport processes regulate the buildup of phytate and its associated nutrients, resulting in globoid storage structures. We suggest, based on the current evidence, that the degradation of the globoid and the mobilization of the nutrients also depend on membrane transport processes, as well as the enzymatic action of phytase.
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7
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Marolt G, Gričar E, Pihlar B, Kolar M. Complex Formation of Phytic Acid With Selected Monovalent and Divalent Metals. Front Chem 2020; 8:582746. [PMID: 33173770 PMCID: PMC7539747 DOI: 10.3389/fchem.2020.582746] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 08/17/2020] [Indexed: 12/20/2022] Open
Abstract
The formation of metal complexes with phytic acid is a complex process that depends strongly on the metal-to-ligand molar ratio, pH value and consequent protonation level of the phytate ligand as well as accompanying side reactions, in particular metal hydrolysis and precipitation of the formed coordination compounds. In the present work, the potentiometric titration technique was used in combination with a detailed analysis of the equivalent point dependencies for selected biologically relevant monovalent and divalent cations from the groups of alkaline earths and transition metals, namely: Mg(II), Zn(II), Fe(II), Cu(I), and Cu(II) ions. The investigation of complex formation mechanism, the evaluation of the species formed, and the identification of other side reactions was based on the examination of three distinct equivalent points, which were detectable by alkalimetric titrations of phytic acid in the presence of selected metal ions. It has been demonstrated that alkaline earth metals interact with different binding site(s) than the transition metals, and experiments with both oxidation states of copper revealed similar complexing characteristics, which depend mainly on the ionic radius (and not on the ionic charge as initially expected). Quantitative data on phytate complexation, hydroxide formation and complex precipitation are presented herein for all metals studied, including Cu(I), which was investigated for the first time by means of alkalimetric titration.
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Affiliation(s)
- Gregor Marolt
- Department of Analytical Chemistry, Faculty of Chemistry and Chemical Technology, Universitly of Ljubljana, Ljubljana, Slovenia
| | - Ema Gričar
- Department of Analytical Chemistry, Faculty of Chemistry and Chemical Technology, Universitly of Ljubljana, Ljubljana, Slovenia
| | - Boris Pihlar
- Department of Analytical Chemistry, Faculty of Chemistry and Chemical Technology, Universitly of Ljubljana, Ljubljana, Slovenia
| | - Mitja Kolar
- Department of Analytical Chemistry, Faculty of Chemistry and Chemical Technology, Universitly of Ljubljana, Ljubljana, Slovenia
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Chen M, Peng C, Su Y, Chen X, Zhang Y, Wang Y, Peng J, Sun Q, Liu X, Huang W. A General Strategy for Hollow Metal‐Phytate Coordination Complex Micropolyhedra Enabled by Cation Exchange. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005892] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Meiling Chen
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
| | - Chenxi Peng
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
| | - Yaoquan Su
- State Key Laboratory of Natural Medicines School of Basic Medical Sciences and Clinical Pharmacy China Pharmaceutical University Nanjing Jiangsu 211198 China
| | - Xue Chen
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
| | - Yuezhou Zhang
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
| | - Yu Wang
- SZU-NUS Collaborative Innovation Center ICL-2DMOST Institute of Microscale Optoelectronics Shenzhen University Shenzhen 518060 China
| | - Juanjuan Peng
- State Key Laboratory of Natural Medicines School of Basic Medical Sciences and Clinical Pharmacy China Pharmaceutical University Nanjing Jiangsu 211198 China
| | - Qiang Sun
- Center for Functional Materials NUS (Suzhou) Research Institute Suzhou Jiangsu 215123 China
| | - Xiaowang Liu
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
| | - Wei Huang
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
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9
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Chen M, Peng C, Su Y, Chen X, Zhang Y, Wang Y, Peng J, Sun Q, Liu X, Huang W. A General Strategy for Hollow Metal‐Phytate Coordination Complex Micropolyhedra Enabled by Cation Exchange. Angew Chem Int Ed Engl 2020; 59:20988-20995. [DOI: 10.1002/anie.202005892] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Indexed: 01/17/2023]
Affiliation(s)
- Meiling Chen
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
| | - Chenxi Peng
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
| | - Yaoquan Su
- State Key Laboratory of Natural Medicines School of Basic Medical Sciences and Clinical Pharmacy China Pharmaceutical University Nanjing Jiangsu 211198 China
| | - Xue Chen
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
| | - Yuezhou Zhang
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
| | - Yu Wang
- SZU-NUS Collaborative Innovation Center ICL-2DMOST Institute of Microscale Optoelectronics Shenzhen University Shenzhen 518060 China
| | - Juanjuan Peng
- State Key Laboratory of Natural Medicines School of Basic Medical Sciences and Clinical Pharmacy China Pharmaceutical University Nanjing Jiangsu 211198 China
| | - Qiang Sun
- Center for Functional Materials NUS (Suzhou) Research Institute Suzhou Jiangsu 215123 China
| | - Xiaowang Liu
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
| | - Wei Huang
- Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Shaanxi Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Flexible Electronics Xi'an Key Laboratory of Biomedical Materials & Engineering Xi'an Institute of Flexible Electronics Institute of Flexible Electronics (IFE) Northwestern Polytechnical University Xi'an 710072 Shaanxi China
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10
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Kremer C, Torres J, Bianchi A, Savastano M, Bazzicalupi C. myo-inositol hexakisphosphate: Coordinative versatility of a natural product. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213403] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Quiñone D, Martínez S, Bozoglián F, Bazzicalupi C, Torres J, Veiga N, Bianchi A, Kremer C. Solution Studies and Crystal Structures of Heteropolynuclear Potassium/Copper Complexes with Phytate and Aromatic Polyamines: Self-Assembly through Coordinative and Supramolecular Interactions. Chempluschem 2020; 84:540-552. [PMID: 31943896 DOI: 10.1002/cplu.201900141] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 04/25/2019] [Indexed: 02/03/2023]
Abstract
Phytate (L12- ) is a relevant natural product. It interacts strongly with biologically relevant cations, due to the high negative charge exhibited in a wide pH range. The synthesis and crystal structures of the mixed-ligand Cu(II) polynuclear complexes K(H2 tptz)0.5 [Cu(H8 L)(tptz)] ⋅ 3.6H2 O (1), K(H2 O)3 {[Cu(H2 O)(bpca)]3 (H8 L)} ⋅ 1.75H2 O (2), and K1.5 (H2 O)2 [Cu(bpca)](H9.5 L) ⋅ 8H2 O (3) (tptz=2,4,6-tri(pyridin-2-yl)-1,3,5-triazine; Hbpca=bis(2-pyridylcarbonyl) amine) are reported herein. They were obtained by the use of an aromatic rigid amine, which satisfies some of the metal coordination sites and promotes the hierarchical assembly of 2D polymeric structures. Speciation of phytate-Cu(II)-Hbpca system and determination of complex stability constants were performed by means of potentiometric titrations, in 0.15 M NMe4 Cl at 37.0 °C, showing that, even in solution, this system is able to produce highly aggregated complexes, such as [Cu3 (bpca)3 (H7 L)]2- . Furthermore, the Cu(II)-mediated tptz hydrolysis was studied by UV-vis spectroscopy at room temperature in 0.15 M NMe4 Cl. Based on the equilibrium results and with the aid of molecular modelling tools, a plausible self-assembly process for 2 and 3 could be proposed.
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Affiliation(s)
- Delfina Quiñone
- Facultad de Química, Universidad de la República, Avenida Gral. Flores 2124, 11800, Montevideo, Uruguay
| | - Sebastián Martínez
- Facultad de Química, Universidad de la República, Avenida Gral. Flores 2124, 11800, Montevideo, Uruguay
| | - Fernando Bozoglián
- Institut Català d'Investigació Química, 16, Avinguda dels Països Catalans, 43007, Tarragona, Spain
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3, 50019, Sesto Fiorentino, Italy
| | - Julia Torres
- Facultad de Química, Universidad de la República, Avenida Gral. Flores 2124, 11800, Montevideo, Uruguay
| | - Nicolás Veiga
- Facultad de Química, Universidad de la República, Avenida Gral. Flores 2124, 11800, Montevideo, Uruguay
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3, 50019, Sesto Fiorentino, Italy
| | - Carlos Kremer
- Facultad de Química, Universidad de la República, Avenida Gral. Flores 2124, 11800, Montevideo, Uruguay
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Madsen CK, Brearley CA, Brinch-Pedersen H. Lab-scale preparation and QC of phytase assay substrate from rice bran. Anal Biochem 2019; 578:7-12. [PMID: 31054994 PMCID: PMC6587120 DOI: 10.1016/j.ab.2019.04.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 04/16/2019] [Accepted: 04/24/2019] [Indexed: 11/20/2022]
Abstract
Phytases are involved in the phosphate acquisition and remobilization in plants, microbes and animals. They have become important technical enzymes in the feed industry and are used to make phosphate, present in animal feed as phytate, available for monogastric animal nutrition. Phytases may also be beneficial to human nutrition because phytate is known to interfere with the uptake of important micronutrients. Accordingly, phytases attract considerable research attention and phytate substrate lacking contaminants that interfere with commonly used phosphate-release assays is essential for this field of science. A procedure to prepare suitable sodium phytate from rice bran is presented. Extracted phytate is precipitated with barium hydroxide and re-dissolved in methanol after washing steps and sulphuric acid treatment. Remaining impurities are precipitated before the dissolved phytate is recovered as the sodium salt by addition of sodium hydroxide. In order to make the substrate widely available for research communities, the procedure relies solely on basic laboratory equipment and materials. Methods for quality control and monitoring of the purified sodium phytate or commercial alternatives are also presented.
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Affiliation(s)
- Claus Krogh Madsen
- Institute of Molecular Biology and Genetics, Aarhus University, Forsogsvej 1, 4200, Slagelse, Denmark.
| | - Charles Alistair Brearley
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK
| | - Henrik Brinch-Pedersen
- Institute of Molecular Biology and Genetics, Aarhus University, Forsogsvej 1, 4200, Slagelse, Denmark
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A novel fluorimetric sensing strategy for highly sensitive detection of phytic acid and hydrogen peroxide. Anal Chim Acta 2018; 1039:74-81. [PMID: 30322555 DOI: 10.1016/j.aca.2018.07.030] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 07/09/2018] [Accepted: 07/13/2018] [Indexed: 01/14/2023]
Abstract
In this paper, we developed a sensitive sensor for phytic acid (PA) and hydrogen peroxide (H2O2) detection based on glutathione-functionalized graphene quantum dots (GQDs@GSH). The fluorescence of GQDs@GSH was found to be effectively quenched by Fe3+ ions via photo-induced electron transfer (PET) process. Upon the addition of PA to GQDs@GSH/Fe3+ system, the fluorescence of GQDs@GSH was significantly restored due to the strong chelating and reducing ability of PA, Fe3+ ions could be reduced to Fe2+ ions by PA and formed PA/Fe2+ complex. Therefore, the "off-on" fluorescence method was constructed to detect PA by using GQDs@GSH/Fe3+ as a fluorescent probe. Furthermore, the method can be used for the detection of H2O2. H2O2 can destroy the chelate structure of PA/Fe2+, release Fe2+ ions and oxidize Fe2+ ions to produce Fe3+ ions, leading to the fluorescence quenching of GQDs@GSH again. Under optimal conditions, the fluorescence sensing platform showed good linear relationship between the relative fluorescence intensity I/I0 and the concentration of PA and H2O2 in the range of 0.05-3 μmol L-1 and 0.5-10 μmol L-1, respectively. The detection limits of PA and H2O2 were 14 nmol L-1 and 0.134 μmol L-1, respectively. Furthermore, the fluorescence assay method was also applied in real sample analysis and satisfactory results were obtained.
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Doolette AL, Smernik RJ. Facile decomposition of phytate in the solid-state: Kinetics and decomposition pathways. PHOSPHORUS SULFUR 2017. [DOI: 10.1080/10426507.2017.1416614] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Ashlea L. Doolette
- School of Agriculture, Food and Wine and Waite Research Institute, The University of Adelaide, Glen Osmond, SA, Australia
| | - Ronald J. Smernik
- School of Agriculture, Food and Wine and Waite Research Institute, The University of Adelaide, Glen Osmond, SA, Australia
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15
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Quiñone D, Veiga N, Torres J, Bazzicalupi C, Bianchi A, Kremer C. Self-Assembly of Manganese(II)-Phytate Coordination Polymers: Synthesis, Crystal Structure, and Physicochemical Properties. Chempluschem 2017; 82:721-731. [DOI: 10.1002/cplu.201700027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 03/14/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Delfina Quiñone
- Departamento Estrella Campos; Facultad de Química; Universidad de la República; General Flores 2124 Montevideo Uruguay
| | - Nicolás Veiga
- Departamento Estrella Campos; Facultad de Química; Universidad de la República; General Flores 2124 Montevideo Uruguay
| | - Julia Torres
- Departamento Estrella Campos; Facultad de Química; Universidad de la República; General Flores 2124 Montevideo Uruguay
| | - Carla Bazzicalupi
- Dipartimento di Chimica “Ugo Schiff”; Universitá degli Studi di Firenze; Via della Lastruccia, 3 50019 Sesto Fiorentino Italy
| | - Antonio Bianchi
- Dipartimento di Chimica “Ugo Schiff”; Universitá degli Studi di Firenze; Via della Lastruccia, 3 50019 Sesto Fiorentino Italy
| | - Carlos Kremer
- Departamento Estrella Campos; Facultad de Química; Universidad de la República; General Flores 2124 Montevideo Uruguay
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Chen X, Zeng G, Gao T, Jin Z, Zhang Y, Yuan H, Xiao D. In situ formation of high performance Ni-phytate on Ni-foam for efficient electrochemical water oxidation. Electrochem commun 2017. [DOI: 10.1016/j.elecom.2016.09.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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17
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Hager A, Wu M, Wang H, Brown NW, Shears SB, Veiga N, Fiedler D. Cellular Cations Control Conformational Switching of Inositol Pyrophosphate Analogues. Chemistry 2016; 22:12406-14. [PMID: 27460418 PMCID: PMC5076471 DOI: 10.1002/chem.201601754] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Indexed: 12/21/2022]
Abstract
The inositol pyrophosphate messengers (PP-InsPs) are emerging as an important class of cellular regulators. These molecules have been linked to numerous biological processes, including insulin secretion and cancer cell migration, but how they trigger such a wide range of cellular responses has remained unanswered in many cases. Here, we show that the PP-InsPs exhibit complex speciation behaviour and propose that a unique conformational switching mechanism could contribute to their multifunctional effects. We synthesised non-hydrolysable bisphosphonate analogues and crystallised the analogues in complex with mammalian PPIP5K2 kinase. Subsequently, the bisphosphonate analogues were used to investigate the protonation sequence, metal-coordination properties, and conformation in solution. Remarkably, the presence of potassium and magnesium ions enabled the analogues to adopt two different conformations near physiological pH. Understanding how the intrinsic chemical properties of the PP-InsPs can contribute to their complex signalling outputs will be essential to elucidate their regulatory functions.
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Affiliation(s)
- Anastasia Hager
- Department of Chemistry, Princeton University, Washington Rd., Princeton, New Jersey, 08544, USA
| | - Mingxuan Wu
- Department of Chemistry, Princeton University, Washington Rd., Princeton, New Jersey, 08544, USA
| | - Huanchen Wang
- Inositol Signaling Group, National Institutes of Health, Research Triangle Park, North Carolina, 27709, USA
| | - Nathaniel W Brown
- Leibniz-Institut für Molekulare Pharmakologie, Robert-Rössle Strasse 10, 13125, Berlin, Germany
- Department of Chemistry, Princeton University, Washington Rd., Princeton, New Jersey, 08544, USA
| | - Stephen B Shears
- Inositol Signaling Group, National Institutes of Health, Research Triangle Park, North Carolina, 27709, USA
| | - Nicolás Veiga
- Cátedra de Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, CC 1157, Montevideo, Uruguay.
| | - Dorothea Fiedler
- Leibniz-Institut für Molekulare Pharmakologie, Robert-Rössle Strasse 10, 13125, Berlin, Germany.
- Department of Chemistry, Princeton University, Washington Rd., Princeton, New Jersey, 08544, USA.
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Gabaza M, Muchuweti M, Vandamme P, Raes K. Can fermentation be used as a sustainable strategy to reduce iron and zinc binders in traditional African fermented cereal porridges or gruels? FOOD REVIEWS INTERNATIONAL 2016. [DOI: 10.1080/87559129.2016.1196491] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Molly Gabaza
- Department of Biochemistry, Faculty of Science, University of Zimbabwe, Harare, Zimbabwe
- Department of Biochemistry and Microbiology, Faculty of Science, Ghent University, Gent, Belgium
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Kortrijk, Belgium
| | - Maud Muchuweti
- Department of Biochemistry, Faculty of Science, University of Zimbabwe, Harare, Zimbabwe
| | - Peter Vandamme
- Department of Biochemistry and Microbiology, Faculty of Science, Ghent University, Gent, Belgium
| | - Katleen Raes
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Kortrijk, Belgium
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Quiñone D, Veiga N, Torres J, Castiglioni J, Bazzicalupi C, Bianchi A, Kremer C. Synthesis, solid-state characterization and solution studies of new phytate compounds with Cu(ii) and 1,10-phenanthroline: progress in the structural elucidation of phytate coordinating ability. Dalton Trans 2016; 45:12156-66. [PMID: 27402248 DOI: 10.1039/c6dt01460g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
myo-Inositol hexakisphosphate(phytate) forms highly structured complexes with Cu(ii) and ammonium cations.
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Affiliation(s)
- D. Quiñone
- Departamento Estrella Campos
- Facultad de Química
- Universidad de la República
- Montevideo
- Uruguay
| | - N. Veiga
- Departamento Estrella Campos
- Facultad de Química
- Universidad de la República
- Montevideo
- Uruguay
| | - J. Torres
- Departamento Estrella Campos
- Facultad de Química
- Universidad de la República
- Montevideo
- Uruguay
| | - J. Castiglioni
- LAFIDESU
- DETEMA
- Facultad de Química
- Universidad de la República
- Montevideo
| | - C. Bazzicalupi
- Dipartimento di Chimica “Ugo Schiff”
- Universitá degli Studi di Firenze
- Firenze
- Italy
| | - A. Bianchi
- Dipartimento di Chimica “Ugo Schiff”
- Universitá degli Studi di Firenze
- Firenze
- Italy
| | - C. Kremer
- Departamento Estrella Campos
- Facultad de Química
- Universidad de la República
- Montevideo
- Uruguay
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Veiga N, Macho I, Gómez K, González G, Kremer C, Torres J. Potentiometric and spectroscopic study of the interaction of 3d transition metal ions with inositol hexakisphosphate. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.05.034] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Veiga N, Torres J, Macho I, Gómez K, González G, Kremer C. Coordination, microprotonation equilibria and conformational changes of myo-inositol hexakisphosphate with pertinence to its biological function. Dalton Trans 2015; 43:16238-51. [PMID: 25058574 DOI: 10.1039/c4dt01350f] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Within all the eukaryotic cells there is an important group of biomolecules that has been potentially related to signalling functions: the myo-inositol phosphates (InsPs). In nature, the most abundant member of this family is the so called InsP6 (phytate, L(12-)), for which our group has strived in the past to elucidate its intricate chemical behaviour. In this work we expand on our earlier findings, shedding light on the inframolecular details of its protonation and complexation processes. We evaluate systematically the chemical performance of InsP6 in the presence and absence of alkali and alkaline earth metal ions, through (31)P NMR measurements, in a non-interacting medium and over a wide pH range. The analysis of the titration curves by means of a model based on the cluster expansion method allows us to describe in detail the distribution of the different protonated microspecies of the ligand. With the aid of molecular modelling tools, we assess the energetic and geometrical characteristics of the protonation sequence and the conformational transition suffered by InsP6 as the pH changes. By completely characterizing the protonation pattern, conformation and geometry of the metal complexes, we unveil the chemical and structural basis behind the influence that the physiologically relevant cations, Na(+), K(+), Mg(2+) and Ca(2+) have over the phytate chemical reactivity. This information is essential in the process of gaining reliable structural knowledge about the most important InsP6 species in the in vitro and in vivo experiments, and how these features modulate their probable biological functions.
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Affiliation(s)
- Nicolás Veiga
- Cátedra de Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, CC 1157, Montevideo, Uruguay.
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Torres J, Giorgi C, Veiga N, Kremer C, Bianchi A. Interaction of myo-inositol hexakisphosphate with biogenic and synthetic polyamines. Org Biomol Chem 2015; 13:7500-12. [DOI: 10.1039/c5ob00900f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
myo-Inositol hexakisphosphate (phytate) forms very stable adducts with biogenic and synthetic polyamines in aqueous solution.
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Affiliation(s)
- Julia Torres
- Cátedra de Química Inorgánica
- Departamento Estrella Campos
- Facultad de Química
- Universidad de la República
- Montevideo
| | - Claudia Giorgi
- Department of Chemistry “Ugo Schiff”
- University of Florence
- Sesto Fiorentino
- Italy
| | - Nicolás Veiga
- Cátedra de Química Inorgánica
- Departamento Estrella Campos
- Facultad de Química
- Universidad de la República
- Montevideo
| | - Carlos Kremer
- Cátedra de Química Inorgánica
- Departamento Estrella Campos
- Facultad de Química
- Universidad de la República
- Montevideo
| | - Antonio Bianchi
- Department of Chemistry “Ugo Schiff”
- University of Florence
- Sesto Fiorentino
- Italy
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Veiga N, Torres J, Bazzicalupi C, Bianchi A, Kremer C. The copper(ii)–phytate–terpyridine ternary system: the first crystal structures showing the interaction of phytate with bivalent metal and ammonium cations. Chem Commun (Camb) 2014; 50:14971-4. [DOI: 10.1039/c4cc07226j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work reports the solution and crystallographic study of the Cu(ii)–phytate–terpyridine systems, showing for the first time the phytate binding mode toward a bivalent cation and protonated polyamine groups.
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Affiliation(s)
- Nicolás Veiga
- Departamento Estrella Campos
- Universidad de la República
- Montevideo, Uruguay
| | - Julia Torres
- Departamento Estrella Campos
- Universidad de la República
- Montevideo, Uruguay
| | - Carla Bazzicalupi
- Dipartimento di Chimica “Ugo Schiff”
- Universitá degli Studi di Firenze
- Firenze, Italy
| | - Antonio Bianchi
- Dipartimento di Chimica “Ugo Schiff”
- Universitá degli Studi di Firenze
- Firenze, Italy
| | - Carlos Kremer
- Departamento Estrella Campos
- Universidad de la República
- Montevideo, Uruguay
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Veiga N, Torres J, Macho I, Gómez K, Godage HY, Riley AM, Potter BVL, González G, Kremer C. Inframolecular acid-base and coordination properties towards Na(+) and Mg(2+) of myo-inositol 1,3,4,5,6-pentakisphosphate: a structural approach to biologically relevant species. Dalton Trans 2013. [PMID: 23183928 PMCID: PMC4011121 DOI: 10.1039/c2dt31807e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The myo-inositol phosphates (InsPs) are specific signalling metabolites ubiquitous in eukaryotic cells. Although Ins(1,3,4,5,6)P(5) is the second most abundant member of the InsPs family, its certain biological roles are far from being elucidated, in part due to the large number of species formed by Ins(1,3,4,5,6)P(5) in the presence of metal ions. In light of this, we have strived in the past to make a complete and at the same time "biological-user-friendly" description of the Ins(1,3,4,5,6)P(5) chemistry with mono and multivalent cations. In this work we expand these studies focusing on the inframolecular aspects of its protonation equilibria and the microscopic details of its coordination behaviour towards biologically relevant metal ions. We present here a systematic study of the Ins(1,3,4,5,6)P(5) intrinsic acid-base processes, in a non-interacting medium, and over a wide pH range, analyzing the (31)P NMR curves by means of a model based on the Cluster Expansion Method. In addition, we have used a computational approach to analyse the energetic and structural features of the protonation and conformational changes of Ins(1,3,4,5,6)P(5), and how they are influenced by the presence of two physiologically relevant cations, Na(+) and Mg(2+).
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Affiliation(s)
- Nicolás Veiga
- Cátedra de Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, CC 1157, Montevideo, Uruguay.
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Bretti C, Cigala RM, Lando G, Milea D, Sammartano S. Sequestering ability of phytate toward biologically and environmentally relevant trivalent metal cations. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:8075-8082. [PMID: 22845864 DOI: 10.1021/jf302007v] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Quantitative parameters for the interactions between phytate (Phy) and Al(3+), Fe(3+), and Cr(3+) were determined potentiometrically in NaNO(3) aqueous solutions at I = 0.10 mol L(-1) and T = 298.15 K. Different complex species were found in a wide pH range. The various species are partially protonated, depending on the pH in which they are formed, and are indicated with the general formula MH(q)Phy (with 0 ≤ q ≤ 6). In all cases, the stability of the FeH(q)Phy species is several log K units higher than that of the analogous AlH(q)Phy and CrH(q)Phy species. For example, for the MH(2)Phy species, the stability trend is log K(2) = 15.81, 20.61, and 16.70 for Al(3+), Fe(3+), and Cr(3+), respectively. The sequestering ability of phytate toward the considered metal cations was evaluated by calculating the pL(0.5) values (i.e., the total ligand concentration necessary to bind 50% of the cation present in trace in solution) at different pH values. In general, phytate results in a quite good sequestering agent toward all three cations in the whole investigated pH range, but the order of pL(0.5) depends on it. For example, at pH 5.0 it is pL(0.5) = 5.33, 5.44, and 5.75 for Fe(3+), Cr(3+), and Al(3+), respectively (Fe(3+) < Cr(3+) < Al(3+)); at pH 7.4 it is pL(0.5) = 9.94, 9.23, and 8.71 (Al(3+) < Cr(3+) < Fe(3+)), whereas at pH 9.0 it is pL(0.5) = 10.42, 10.87, and 8.34 (Al(3+) < Fe(3+) < Cr(3+)). All of the pL(0.5) values, and therefore the sequestering ability, regularly increase with increasing pH, and the dependence of pL(0.5) on pH was modeled using some empirical equations.
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Affiliation(s)
- Clemente Bretti
- Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Viale Ferdinando Stagno d'Alcontres 31, I-98166 Messina (Vill. S. Agata), Italy
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Cao S, Dong N, Chen J. Synchronous fluorescence determination of phytic acid in foodstuffs and urine based on replacement reaction. PHYTOCHEMICAL ANALYSIS : PCA 2011; 22:119-123. [PMID: 20821808 DOI: 10.1002/pca.1254] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2009] [Revised: 04/17/2010] [Accepted: 06/01/2010] [Indexed: 05/29/2023]
Abstract
INTRODUCTION Phytic acid is a ubiquitous and abundant natural component in many plant seeds, fruits and vegetables. Its biological and pharmaceutical functions are still controversial. The examination on the level of phytic acid in foodstuffs and urine can provide valuable information for its dietary intake and metabolism. OBJECTIVE To develop a sensitive and reliable synchronous fluorescence protocol for determination of phytic acid in selected foodstuffs and human urine. METHODOLOGY Phytic acid efficiently catches Cu²+ ion in previously prepared Cu(II) -2,2'-bipyridine complex in aqueous solution, releasing the fluorescent 2,2'-bipyridine molecule and recovering synchronous fluorescence. The recovered fluorescence is proportional to the added phytic acid, by which the levels of phytic acid in the selected foodstuffs and human urine are quantified. RESULTS A calibration curve with a regression equation of I(f) = 37.745 + 39.245c (R² > 0.9988) showed good linearity over the range 0.18-17.50 mg/L phytic acid. The relative standard deviation at 95% confidence degree was less than 2.04% (n = 5), indicating that the procedures are reproducible. The detection and quantification limit of phytic acid were estimated to be 0.12 and 0.18 mg/L, respectively. By the proposed method, phytic acid in the selected foodstuffs and urine was determined to be 3.25-16.76 and 0.43-1.21 mg/L with recoveries of 96.8%-105.6% and 95.1%-104.2%, respectively. The results are in good agreement with those obtained by the reported HPLC technique. CONCLUSION The developed method is sensitive, reliable and economical, which permits its practical application in quantitative analyses of trace phytic acid in foodstuffs and urine.
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Affiliation(s)
- Shuhong Cao
- School of Chemical and Biological Engineering, Yancheng Institute of Technology, Yancheng 224051, People's Republic of China
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Potentiometric and 31P NMR studies on inositol phosphates and their interaction with iron(III) ions. Carbohydr Res 2011; 346:488-94. [DOI: 10.1016/j.carres.2010.12.021] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 12/27/2010] [Accepted: 12/28/2010] [Indexed: 11/21/2022]
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Veiga N, Torres J, González G, Gómez K, Mansell D, Freeman S, Domínguez S, Kremer C. Insight into the protonation and K(I)-interaction of the inositol 1,2,3-trisphosphate as provided by 31P NMR and theoretical calculations. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2010.11.050] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Díaz A, Casaravilla C, Irigoín F, Lin G, Previato JO, Ferreira F. Understanding the laminated layer of larval Echinococcus I: structure. Trends Parasitol 2011; 27:204-13. [PMID: 21257348 DOI: 10.1016/j.pt.2010.12.012] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 12/22/2010] [Accepted: 12/30/2010] [Indexed: 10/18/2022]
Abstract
Echinococcus larvae are protected by a massive carbohydrate-rich acellular structure, called the laminated layer. In spite of being widely considered the crucial element of these host-parasite interfaces, the laminated layer has been historically poorly understood. In fact, it is still often called 'chitinous', 'hyaline' or 'cuticular' layer, or said to be composed of polysaccharides. However, over the past few years the laminated layer was found to be comprised of mucins bearing defined galactose-rich carbohydrates, and accompanied, in the case of Echinococcus granulosus, by calcium inositol hexakisphosphate deposits. In this review, the architecture and biosynthesis of this unusual structure is discussed at depth in terms of what is known and what needs to be discovered.
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Affiliation(s)
- Alvaro Díaz
- Cátedra de Inmunología, Departamento de Biociencias, Facultad de Química/Instituto de Química Biológica, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay.
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The behaviour of inositol 1,3,4,5,6-pentakisphosphate in the presence of the major biological metal cations. J Biol Inorg Chem 2009; 14:1001-13. [PMID: 19415348 PMCID: PMC2745655 DOI: 10.1007/s00775-009-0510-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Accepted: 04/20/2009] [Indexed: 01/07/2023]
Abstract
The inositol phosphates are ubiquitous metabolites in eukaryotes, of which the most abundant are inositol hexakisphosphate (InsP 6) and inositol 1,3,4,5,6-pentakisphosphate [Ins(1,3,4,5,6)P5)]. These two compounds, poorly understood functionally, have complicated complexation and solid formation behaviours with multivalent cations. For InsP 6, we have previously described this chemistry and its biological implications (Veiga et al. in J Inorg Biochem 100:1800, 2006; Torres et al. in J Inorg Biochem 99:828, 2005). We now cover similar ground for Ins(1,3,4,5,6)P5, describing its interactions in solution with Na+, K+, Mg2+, Ca2+, Cu2+, Fe2+ and Fe3+, and its solid-formation equilibria with Ca2+ and Mg2+. Ins(1,3,4,5,6)P5 forms soluble complexes of 1:1 stoichiometry with all multivalent cations studied. The affinity for Fe3+ is similar to that of InsP6 and inositol 1,2,3-trisphosphate, indicating that the 1,2,3-trisphosphate motif, which Ins(1,3,4,5,6)P5 lacks, is not absolutely necessary for high-affinity Fe3+ complexation by inositol phosphates, even if it is necessary for their prevention of the Fenton reaction. With excess Ca2+ and Mg2+, Ins(1,3,4,5,6)P5 also forms the polymetallic complexes [M4(H2L)] [where L is fully deprotonated Ins(1,3,4,5,6)P5]. However, unlike InsP6, Ins(1,3,4,5,6)P5 is predicted not to be fully associated with Mg2+ under simulated cytosolic/nuclear conditions. The neutral Mg2+ and Ca2+ complexes have significant windows of solubility, but they precipitate as [Mg4(H2L)] x 23H2O or [Ca4(H2L)] x 16H2O whenever they exceed 135 and 56 microM in concentration, respectively. Nonetheless, the low stability of the [M4(H2L)] complexes means that the 1:1 species contribute to the overall solubility of Ins(1,3,4,5,6)P 5 even under significant Mg2+ or Ca2+ excesses. We summarize the solubility behaviour of Ins(1,3,4,5,6)P5 in straightforward plots.
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Veiga N, Torres J, Mansell D, Freeman S, Domínguez S, Barker CJ, Díaz A, Kremer C. "Chelatable iron pool": inositol 1,2,3-trisphosphate fulfils the conditions required to be a safe cellular iron ligand. J Biol Inorg Chem 2008; 14:51-9. [PMID: 18762996 DOI: 10.1007/s00775-008-0423-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2008] [Accepted: 08/20/2008] [Indexed: 11/29/2022]
Abstract
Mammalian cells contain a pool of iron that is not strongly bound to proteins, which can be detected with fluorescent chelating probes. The cellular ligands of this biologically important "chelatable", "labile" or "transit" iron are not known. Proposed ligands are problematic, because they are saturated by magnesium under cellular conditions and/or because they are not "safe", i.e. they allow iron to catalyse hydroxyl radical formation. Among small cellular molecules, certain inositol phosphates (InsPs) excel at complexing Fe(3+) in such a "safe" manner in vitro. However, we previously calculated that the most abundant InsP, inositol hexakisphosphate, cannot interact with Fe(3+) in the presence of cellular concentrations of Mg(2+). In this work, we study the metal complexation behaviour of inositol 1,2,3-trisphosphate [Ins(1,2,3)P(3)], a cellular constituent of unknown function and the simplest InsP to display high-affinity, "safe", iron complexation. We report thermodynamic constants for the interaction of Ins(1,2,3)P(3) with Na(+), K(+), Mg(2+), Ca(2+), Cu(2+), Fe(2+) and Fe(3+). Our calculations indicate that Ins(1,2,3)P(3) can be expected to complex all available Fe(3+) in a quantitative, 1:1 reaction, both in cytosol/nucleus and in acidic compartments, in which an important labile iron subpool is thought to exist. In addition, we calculate that the fluorescent iron probe calcein would strip Fe(3+) from Ins(1,2,3)P(3) under cellular conditions, and hence labile iron detected using this probe may include iron bound to Ins(1,2,3)P(3). Therefore Ins(1,2,3)P(3) is the first viable proposal for a transit iron ligand.
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Affiliation(s)
- Nicolás Veiga
- Departamento Estrella Campos, Facultad de Química, Universidad de la República, CC 1157, Montevideo, Uruguay
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