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Notova SV, Lebedev SV, Marshinskaia OV, Kazakova TV, Ajsuvakova OP. Speciation analysis of manganese against the background of its different content in the blood serum of dairy cows. Biometals 2023; 36:35-48. [PMID: 36282443 DOI: 10.1007/s10534-022-00456-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 10/06/2022] [Indexed: 11/28/2022]
Abstract
Studies in the field of microelement speciation in the body of farm animals, in particular dairy cattle, are almost completely absent. The average concentration of Mn in the blood serum of all the studied animals (n = 80) was 2.5 μg/L, which corresponds to normal values. Of the total number of animals, 21% were the cows with the low normal values (serum Mn concentration ≤ 2 µg/L, i.e. less than Q25 of the total sample) and 25% were the animals with the high normal values (serum Mn concentration ≥ 2.72 µg/L, i.e. more than Q75 of the total sample). The data obtained in the course of the study indicate that the change in the Mn level, even in the range of normal values, is accompanied by the redistribution of this element over various protein fractions. The six found Mn blood serum forms are presumably represented by α2-macroglobulin (tetramer, dimer, and monomer), transferrin/albumine, manganese citrates, and "free" metal ions. The analyzed fractions of Mn found in the blood serum of cows had the following hierarchy of concentrations: in the group with low-normal values of Mn ("free" Mn >> tetrameric form of α2-macroglobulin >> transferrin/albumine >> dimeric form of α2-macroglobulin >> monomeric form of α2-macroglobulin >> citrate), in the group with high normal manganese values ("free" Mn >> monomeric form of α2-macroglobulin >> transferring/albumine >> citrate >> tetrameric form of α2-macroglobulin >> dimeric form of α2-macroglobulin). In the group with high normal Mn values relative to the group with low normal values, there was a percentage decrease in the tetrameric fraction of a2-macroglobulin from 17.2 to 4.4%, dimeric fraction of a2-macroglobulin from 6.9 to 2.2%, "free" Mn from 54.3 to 44.4% and an increase in monomeric fraction of a2-macroglobulin from 6.7 to 23.1%, transferrin/albumine from 10.1 to 17.7%, citrate from 4.8 to 8.2%. Our data demonstrate the features of Mn redistribution of dairy cows, which can be used for an extended assessment of the microelement status of animals.
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Affiliation(s)
- S V Notova
- Federal Research Centre for Biological Systems and Agrotechnologies of the Russian Academy of Sciences, St. 9 Yanvarya, 29, Orenburg, Russian Federation, 460000
| | - S V Lebedev
- Federal Research Centre for Biological Systems and Agrotechnologies of the Russian Academy of Sciences, St. 9 Yanvarya, 29, Orenburg, Russian Federation, 460000
| | - O V Marshinskaia
- Federal Research Centre for Biological Systems and Agrotechnologies of the Russian Academy of Sciences, St. 9 Yanvarya, 29, Orenburg, Russian Federation, 460000.
| | - T V Kazakova
- Federal Research Centre for Biological Systems and Agrotechnologies of the Russian Academy of Sciences, St. 9 Yanvarya, 29, Orenburg, Russian Federation, 460000
| | - O P Ajsuvakova
- Federal Research Centre for Biological Systems and Agrotechnologies of the Russian Academy of Sciences, St. 9 Yanvarya, 29, Orenburg, Russian Federation, 460000
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Fındık BK, Cilesiz U, Bali SK, Atilgan C, Aviyente V, Dedeoglu B. Investigation of iron release from the N- and C-lobes of human serum transferrin by quantum chemical calculations. Org Biomol Chem 2022; 20:8766-8774. [DOI: 10.1039/d2ob01518h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Cluster models of iron binding sites of the N- and C-lobes highlights the inequivalence of each lobe in iron release.
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Affiliation(s)
- Basak Koca Fındık
- Department of Chemistry, Bogazici University, Istanbul, 34342, Bebek, Turkey
| | - Umut Cilesiz
- Department of Chemistry, Bogazici University, Istanbul, 34342, Bebek, Turkey
| | - Semiha Kevser Bali
- Department of Chemistry, Bogazici University, Istanbul, 34342, Bebek, Turkey
| | - Canan Atilgan
- Faculty of Engineering and Natural Sciences, Sabancı University, Orhanlı-Tuzla, Istanbul, 34956, Turkey
| | - Viktorya Aviyente
- Department of Chemistry, Bogazici University, Istanbul, 34342, Bebek, Turkey
| | - Burcu Dedeoglu
- Department of Chemistry, Gebze Technical University, Gebze, Kocaeli, 41400, Turkey
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Pessoa JC, Santos MF, Correia I, Sanna D, Sciortino G, Garribba E. Binding of vanadium ions and complexes to proteins and enzymes in aqueous solution. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214192] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Sciortino G, Garribba E. The binding modes of V IVO 2+ ions in blood proteins and enzymes. Chem Commun (Camb) 2021; 56:12218-12221. [PMID: 32926012 DOI: 10.1039/d0cc04595k] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The binding modes of VIVO2+ ions to hemoglobin (Hb), human serum transferrin (hTf), immunoglobulin G (IgG), vanadium bromoperoxidase (VBrPO) and VIVO2+-substituted imidazoleglycerol-phosphatase dehydratase (IGPD) were determined by a combined approach of full DFT and MM techniques. These results reproduce and explain the experimental spectroscopic (EPR and ESEEM) data.
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Affiliation(s)
- Giuseppe Sciortino
- Departament de Química, Universitat Autònoma de Barcelona, Cerdanyola del Vallés 08193, Barcelona, Spain. and Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, Sassari I-07100, Italy.
| | - Eugenio Garribba
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, Sassari I-07100, Italy.
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Ott DB, Hartwig A, Stillman MJ. Competition between Al 3+ and Fe 3+ binding to human transferrin and toxicological implications: structural investigations using ultra-high resolution ESI MS and CD spectroscopy. Metallomics 2020; 11:968-981. [PMID: 30916671 DOI: 10.1039/c8mt00308d] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Human serum transferrin (hTF) is an iron binding protein with the primary task of ensuring well-controlled transport of Fe3+-ions in the bloodstream. Furthermore, hTF has been identified as a key component in the trafficking of Al3+-ions from the serum to cells. It is clear that binding alone does not guarantee cellular uptake via the transferrin receptor, since this is determined by the structural properties of the metal-protein complex. The conformation of the metallated hTF is critically important for delivery of Fe3+ or any other metal into the cell. The combination of ultra-high resolution ESI mass spectrometry and CD spectroscopy together provide accurate species distribution of the Fe3+ during stepwise addition to apo-hTF and an indirect indication of the tertiary structure of the metallated protein. These two methods together are extremely fine probes of structural changes as a function of precise metal binding status at micromolar concentrations. Simulation of the precise domain distribution could be determined during the stepwise metallation from 0 to 2 Fe3+ added. Analysis of the ESI-MS data for the stepwise metallation of apo-hTF and Al1 or 2-hTF with Fe3+ was carried out and used to simulate the experimental speciation based on the reported KF values. There are six main conclusions: (1) Fe3+ binds predominantly, initially to the C-lobe. (2) The CD spectral properties indicate that the C-lobe metallation dominates the structural properties of both binding sites; N-lobe metallation modifies the C-lobe structure. (3) Fe3+ metallation of the mixed Al1-2-hTF results in the dominant form of Fe1Al1-hTF. (4) The first Fe3+ bound to Al1-hTF binds predominantly in the C-lobe domain. (5) The CD spectral properties when Fe3+ binds to Al1-2-hTF indicates that Al-N-lobe occupation mirrors the structural effects of N-lobe occupation by Fe3+. (6) With respect to how Al3+ might enter the cell, the formation of a hybrid form Al1Fe1-hTF might enable the Al3+ to enter the cell via receptor-mediated endocytosis due to the binding of Fe3+ in the C-lobe of the protein which is primarily responsible for the structure of the metal-protein complex.
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Affiliation(s)
- Dorothee B Ott
- Food Chemistry and Toxicology, Institute for Applied Biosciences, Karlsruhe Institute of Technology (KIT), Kaiserstrasse 12, 76131 Karlsruhe, Germany
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Sarkar A, Sharma A, Goswami D, Namboodiri V, Enderlein J, Kumbhakar M. Binding Constant Determined from the Angstrom-Scale Change in Hydrodynamic Radius of Transferrin upon Binding with Europium Using Dual-Focus Fluorescence Correlation Spectroscopy. J Phys Chem Lett 2020; 11:1148-1153. [PMID: 31968931 DOI: 10.1021/acs.jpclett.9b03722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Monitoring the binding of a large fluorescently tagged molecule to a small solute by fluorescence correlation spectroscopy (FCS) is rather uncommon because the binding-related change in diffusion coefficient is very small. Here, we use a high-precision variant of FCS, namely, dual-focus FCS (2fFCS), for measuring the angstrom-scale change of the hydrodynamic radius of the bilobal metal transport protein transferrin (Tf) upon binding europium ions. Applying a sequential 1:2 complexation model, we use these measurements for determining the binding constants (K). Our results show a 0.7 Å change of the protein's hydrodynamic radius upon 1:1 Tf-Eu complex formation and a second change of 1.8 Å upon subsequent binding of a second europium ion. More than one unit variation in logK indicates an intrinsic dissimilarity in metal affinity of the C- and N-lobes of Tf, which agrees well with earlier reported ensemble spectroscopy results.
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Affiliation(s)
- Aranyak Sarkar
- Radiation & Photochemistry Division , Bhabha Atomic Research Center , Mumbai 400085 , India
- Homi Bhabha National Institute , Training School Complex , Anushaktinagar, Mumbai 400094 , India
| | - Arjun Sharma
- Radiation & Photochemistry Division , Bhabha Atomic Research Center , Mumbai 400085 , India
- Homi Bhabha National Institute , Training School Complex , Anushaktinagar, Mumbai 400094 , India
| | - Dibakar Goswami
- Radiation & Photochemistry Division , Bhabha Atomic Research Center , Mumbai 400085 , India
- Bio-oragnic Division , Bhabha Atomic Research Center , Mumbai 400085 , India
| | - Vinu Namboodiri
- Radiation & Photochemistry Division , Bhabha Atomic Research Center , Mumbai 400085 , India
| | - Jörg Enderlein
- III. Institute of Physics - Biophysics , Georg August University , 37077 Göttingen , Germany
| | - Manoj Kumbhakar
- Radiation & Photochemistry Division , Bhabha Atomic Research Center , Mumbai 400085 , India
- Homi Bhabha National Institute , Training School Complex , Anushaktinagar, Mumbai 400094 , India
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Sanna D, Ugone V, Serra M, Garribba E. Speciation of potential anti-diabetic vanadium complexes in real serum samples. J Inorg Biochem 2017; 173:52-65. [PMID: 28499214 DOI: 10.1016/j.jinorgbio.2017.04.023] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 03/28/2017] [Accepted: 04/23/2017] [Indexed: 10/19/2022]
Abstract
In this work the speciation in real serum samples of five VIVO complexes with potential application in the therapy of diabetes was studied through EPR spectroscopy as a function of V concentration (45.4, 90.9 and 454.5μM) and time (0-180min). [VO(dhp)2], [VO(ma)2], [VO(acac)2], [VO(pic)2(H2O)], and [VO(mepic)2], where Hdhp indicates 1,2-dimethyl-3-hydroxy-4(1H)-pyridinone, Hma maltol, Hacac acetylacetone, Hpic picolinic acid, and Hmepic 6-methylpicolinic acid, were examined. The distribution of VIVO2+ among the serum bioligands was calculated from the thermodynamic stability constants in the literature and compared with the experimental results. EPR results, which confirm the prediction, depend on the strength of the ligand L and geometry assumed by the bis-chelated species at physiological pH, cis-octahedral or square pyramidal. With dhp, the strongest chelator, the system is dominated by [VO(dhp)2] and/or cis-VO(dhp)2(Protein); with intermediate strength chelators, i.e. maltolate, acetylacetonate and picolinate, by cis-VO(ma)2(Protein), [VO(acac)2] or [VO(pic)(citrH-1)]3-/[VO(pic)(lactH-1)]- (citr=citrate and lact=lactate) when the V concentration overcomes 100-200μM and by (VO)(hTf)/(VO)2(hTf) when concentration is lower than 100μM; with the weakest chelator, 6-methylpicolinate, (VO)(hTf)/(VO)2(hTf), (VO)(HSA) (hTf = human serum transferrin and HSA = human serum albumin), and VO(mepic)(Protein)(OH) are the major species at concentration higher than 100-200μM, whereas hydrolytic processes are observed for lower concentrations. For [VO(dhp)2], [VO(ma)2], [VO(acac)2] and [VO(pic)2(H2O)], the EPR spectra remain unaltered with elapsing time, while for mepic they change significantly because the hydrolyzed VIVO species are complexed by the serum bioligands, in particular by lactate. The rate of oxidation in the serum is [VO(dhp)2]>[VO(ma)2]>[VO(acac)2] and reflects the order of E1/2 values.
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Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy.
| | - Valeria Ugone
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
| | - Maria Serra
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Eugenio Garribba
- Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy.
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Prybylski JP, Maxwell E, Coste Sanchez C, Jay M. Gadolinium deposition in the brain: Lessons learned from other metals known to cross the blood-brain barrier. Magn Reson Imaging 2016; 34:1366-1372. [PMID: 27580521 DOI: 10.1016/j.mri.2016.08.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 08/20/2016] [Indexed: 01/18/2023]
Abstract
The recent discovery of gadolinium (Gd) deposition in the brains of patients receiving Gd-based contrast agents (GBCAs) raises several important questions including by what mechanism Gd or GBCAs pass through the blood-brain barrier. Decades of research focused on the safety and stability of GBCAs have not identified any mechanism of uptake. Here we review findings of Gd deposition from human and animal data, and how distribution mechanisms elucidated for endogenous and toxic metals may explain entrance of Gd into the central nervous system. Three general uptake mechanisms are considered along with examples of metals known to enter the central nervous system by these routes: (1) carrier-mediated, (2) transporter-mediated and (3) passive. The potential for chelation therapy to reduce deposition is also discussed. The work reported for other metals provides guidance for how the mechanism of Gd deposition in the brain can be determined which is essential information for rational prevention or treatment.
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Affiliation(s)
- John P Prybylski
- Division of Molecular Pharmaceutics, UNC Eshelman School of Pharmacy, University of North Carolina, 4012 Marsico Hall, Chapel Hill, NC, 27599-7362.
| | - Erin Maxwell
- Division of Molecular Pharmaceutics, UNC Eshelman School of Pharmacy, University of North Carolina, 4012 Marsico Hall, Chapel Hill, NC, 27599-7362.
| | - Carla Coste Sanchez
- Division of Molecular Pharmaceutics, UNC Eshelman School of Pharmacy, University of North Carolina, 4012 Marsico Hall, Chapel Hill, NC, 27599-7362.
| | - Michael Jay
- Division of Molecular Pharmaceutics, UNC Eshelman School of Pharmacy, University of North Carolina, 4012 Marsico Hall, Chapel Hill, NC, 27599-7362.
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Zhang XF, Lan L, Chen L, Chen HB, Yang QF, Li Q, Li QL, Sun XR, Tang YL. Spectroscopic Investigation on the Binding of a Cyanine Dye with Transferrin. J PHYS ORG CHEM 2015. [DOI: 10.1002/poc.3508] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xiu-feng Zhang
- College of Chemical Engineering; North China University of Science and Technology; Tangshan Hebei 063009 China
| | - Ling Lan
- College of Chemical Engineering; North China University of Science and Technology; Tangshan Hebei 063009 China
| | - Lei Chen
- College of Chemical Engineering; North China University of Science and Technology; Tangshan Hebei 063009 China
| | - Hong-bo Chen
- College of Chemical Engineering; North China University of Science and Technology; Tangshan Hebei 063009 China
| | - Qian-fan Yang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Qian Li
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Qi-long Li
- College of Chemical Engineering; North China University of Science and Technology; Tangshan Hebei 063009 China
| | - Xiao-ran Sun
- College of Chemical Engineering; North China University of Science and Technology; Tangshan Hebei 063009 China
| | - Ya-lin Tang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
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Costa Pessoa J, Garribba E, Santos MF, Santos-Silva T. Vanadium and proteins: Uptake, transport, structure, activity and function. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2015.03.016] [Citation(s) in RCA: 141] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Mathavan A, Ramdass A, Rajagopal S. A Spectroscopy Approach for the Study of the Interaction of Oxovanadium(IV)-Salen Complexes with Proteins. J Fluoresc 2015; 25:1141-9. [PMID: 26139532 DOI: 10.1007/s10895-015-1604-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 06/15/2015] [Indexed: 11/26/2022]
Abstract
Oxovanadium(IV)-salen complexes bind with bovine serum albumin (BSA) and ovalbumin (OVA) strongly with binding constant in the range 10(4)-10(7) M(-1) at physiological pH (7.4) confirmed using UV-visible absorption, fluorescence spectral and circular dichroism (CD) study. CD results show that the binding of oxovanadium(IV) complexes induces the conformational change with the loss of α-helicity in the proteins. Docking studies indicate that mode of binding of oxovanadium(IV)-salen complexes with proteins is hydrophobic in nature.
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Affiliation(s)
- Alagarsamy Mathavan
- Department of Chemistry, V. O. Chidambaram College, Tuticorin, 628 008, India
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Interaction of the anticancer gallium(III) complexes of 8-hydroxyquinoline and maltol with human serum proteins. J Biol Inorg Chem 2015; 20:77-88. [PMID: 25398250 DOI: 10.1007/s00775-014-1211-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 10/27/2014] [Indexed: 01/12/2023]
Abstract
Tris(8-quinolinolato)gallium(III) (KP46) and tris(maltolato)gallium(III) (GaM) are promising orally active antitumor metallodrugs currently undergoing clinical trials. Their interaction with human serum albumin (HSA) and transferrin (Tf) was studied in detail in aqueous solution by the combination of various methods such as spectrofluorometry, UV-vis spectrophotometry, (1)H and saturation transfer difference NMR spectroscopy, and ultrafiltration-UV-vis spectrophotometry. Binding data were evaluated quantitatively. Tf was found to replace the original ligand much less efficiently in KP46 than in GaM, whereas a significant noncovalent binding of KP46 with HSA (log K' = 4.04) retaining the coordination environment around gallium(III) was found. The interaction between HSA and KP46 was also confirmed by protein-complex modeling calculations. On the basis of the conditional stability constants, the distribution of gallium(III) in serum was computed and compared for these metallodrugs under physiological conditions, and revealed the prominent role of HSA in the case of KP46 and that of Tf for GaM.
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Koleša-Dobravc T, Lodyga-Chruscinska E, Symonowicz M, Sanna D, Meden A, Perdih F, Garribba E. Synthesis and characterization of V(IV)O complexes of picolinate and pyrazine derivatives. Behavior in the solid state and aqueous solution and biotransformation in the presence of blood plasma proteins. Inorg Chem 2014; 53:7960-76. [PMID: 25013935 DOI: 10.1021/ic500766t] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Oxidovanadium(IV) complexes with 5-cyanopyridine-2-carboxylic acid (HpicCN), 3,5-difluoropyridine-2-carboxylic acid (HpicFF), 3-hydroxypyridine-2-carboxylic acid (H2hypic), and pyrazine-2-carboxylic acid (Hprz) have been synthesized and characterized in the solid state and aqueous solution through elemental analysis, IR and EPR spectroscopy, potentiometric titrations, and DFT simulations. The crystal structures of the complexes (OC-6-23)-[VO(picCN)2(H2O)]·2H2O (1·2H2O), (OC-6-24)-[VO(picCN)2(H2O)]·4H2O (2·4H2O), (OC-6-24)-Na[VO(Hhypic)3]·H2O (4), and two enantiomers of (OC-6-24)-[VO(prz)2(H2O)] (Λ-5 and Δ-5) have been determined also by X-ray crystallography. 1 presents the first crystallographic evidence for the formation of a OC-6-23 isomer for bis(picolinato) V(IV)O complexes, whereas 2, 4, and 5 possess the more common OC-6-24 arrangement. The strength order of the ligands is H2hypic ≫ HpicCN > Hprz > HpicFF, and this results in a different behavior at pH 7.40. In organic and aqueous solution the three isomers OC-6-23, OC-6-24, and OC-6-42 are formed, and this is confirmed by DFT simulations. In all the systems with apo-transferrin (VO)2(apo-hTf) is the main species in solution, with the hydrolytic V(IV)O species becoming more important with lowering the strength of the ligand. In the systems with albumin, (VO)(x)HSA (x = 5, 6) coexists with VOL2(HSA) and VOL(HSA)(H2O) when L = picCN, prz, with [VO(Hhypic)(hypic)](-), [VO(hypic)2](2-), and [(VO)4(μ-hypic)4(H2O)4] when H2hypic is studied, and with the hydrolytic V(IV)O species when HpicFF is examined. Finally, the consequence of the hydrolysis on the binding of V(IV)O(2+) to the blood proteins, the possible uptake of V species by the cells, and the possible relationship with the insulin-enhancing activity are discussed.
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Affiliation(s)
- Tanja Koleša-Dobravc
- Faculty of Chemistry and Chemical Technology, University of Ljubljana , Aškerčeva cesta 5, SI-1000 Ljubljana, Slovenia , and
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Bauer N, Fröhlich DR, Panak PJ. Interaction of Cm(iii) and Am(iii) with human serum transferrin studied by time-resolved laser fluorescence and EXAFS spectroscopy. Dalton Trans 2014; 43:6689-700. [DOI: 10.1039/c3dt53371a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sanna D, Serra M, Micera G, Garribba E. Interaction of antidiabetic vanadium compounds with hemoglobin and red blood cells and their distribution between plasma and erythrocytes. Inorg Chem 2014; 53:1449-64. [PMID: 24437949 DOI: 10.1021/ic402366x] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The interaction of V(IV)O(2+) ion with hemoglobin (Hb) was studied with the combined application of spectroscopic (EPR), spectrophotometric (UV-vis), and computational (DFT methods) techniques. Binding of Hb to V(IV)O(2+) in vitro was proved, and three unspecific sites (named α, β, and γ) were characterized, with the probable coordination of His-N, Asp-O(-), and Glu-O(-) donors. The value of log β for (VO)Hb is 10.4, significantly lower than for human serum apo-transferrin (hTf). In the systems with V(IV)O potential antidiabetic compounds, mixed species cis-VOL2(Hb) (L = maltolate (ma), 1,2-dimethyl-3-hydroxy-4(1H)-pyridinonate (dhp)) are observed with equatorial binding of an accessible His residue, whereas no ternary complexes are observed with acetylacetonate (acac). The experiments of uptake of [VO(ma)2], [VO(dhp)2], and [VO(acac)2] by red blood cells indicate that the neutral compounds penetrate the erythrocyte membrane through passive diffusion, and percent amounts higher than 50% are found in the intracellular medium. The biotransformation of [VO(ma)2], [VO(dhp)2], and [VO(acac)2] inside the red blood cells was proved. [VO(dhp)2] transforms quantitatively in cis-VO(dhp)2(Hb), [VO(ma)2] in cis-VO(ma)2(Hb), and cis-VO(ma)2(Cys-S(-)), with the equatorial coordination of a thiolate-S(-) of GSH or of a membrane protein, and [VO(acac)2] in the binary species (VO)xHb and two V(IV)O complexes with formulation VO(L(1),L(2)) and VO(L(3),L(4)), where L(1), L(2), L(3), and L(4) are red blood cell bioligands. The results indicate that, in the studies on the transport of a potential pharmacologically active V species, the interaction with red blood cells and Hb cannot be neglected, that a distribution between the erythrocytes and plasma is achieved, and that these processes can significantly influence the effectiveness of a V drug.
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Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare , Trav. La Crucca 3, I-07040 Sassari, Italy
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Senthilnathan D, Kalaiselvan A, Vedha SA, Venuvanalingam P. The metal delivery mechanism of transferrin and the role of bent metallocene metals towards anticancer activity – a theoretical exploration. RSC Adv 2014. [DOI: 10.1039/c3ra46422a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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Sanna D, Micera G, Garribba E. Interaction of insulin-enhancing vanadium compounds with human serum holo-transferrin. Inorg Chem 2013; 52:11975-85. [PMID: 24090437 DOI: 10.1021/ic401716x] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The interaction of VO(2+) ion and four insulin-enhancing compounds, [VO(ma)2], [VO(dhp)2], [VO(acac)2], and cis-[VO(pic)2(H2O)], where Hma, Hdhp, Hacac, and Hpic are maltol, 1,2-dimethyl-3-hydroxy-4(1H)-pyridinone, acetylacetone, and picolinic acid, with holo-transferrin (holo-hTf) was studied through the combined application of electron paramagnetic resonance (EPR) and density functional theory (DFT) methods. Since in holo-hTf all of the specific binding sites of transferrin are saturated by Fe(3+) ions, VO(2+) can interact with surface sites (here named sites C), probably via the coordination of His-N, Asp-COO(-), and Glu-COO(-) donors. In the ternary systems with the insulin-enhancing compounds, mixed species are observed with Hma, Hdhp, and Hpic with the formation of VOL2(holo-hTf), explained through the interaction of cis-[VOL2(H2O)] (L = ma, dhp) or cis-[VOL2(OH)](-) (L = pic) with an accessible His residue that replaces the monodentate H2O or OH(-) ligand. The residues of His-289, His-349, His-473, and His-606 seem the most probable candidates for the complexation of the cis-VOL2 moiety. The lack of a ternary complex with Hacac was attributed to the square-pyramidal structure of [VO(acac)2], which does not possess equatorial sites that can be replaced by the surface His-N. Since holo-transferrin is recognized by the transferrin receptor, the formation of ternary complexes between VO(2+) ion, a ligand L(-), and holo-hTf may be a way to transport vanadium compounds inside the cells.
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Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare , Trav. La Crucca 3, I-07040 Sassari, Italy
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Mehtab S, Gonçalves G, Roy S, Tomaz AI, Santos-Silva T, Santos MFA, Romão MJ, Jakusch T, Kiss T, Pessoa JC. Interaction of vanadium(IV) with human serum apo-transferrin. J Inorg Biochem 2013; 121:187-95. [PMID: 23411030 DOI: 10.1016/j.jinorgbio.2012.12.020] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Revised: 12/27/2012] [Accepted: 12/28/2012] [Indexed: 10/27/2022]
Abstract
The interaction of V(IV)O-salts as well as of a few V(IV)O(carrier)n complexes with human serum transferrin (hTF) is studied focusing on the determination of the nature and stoichiometry of the binding of V(IV)O(2+) to hTF, as well as whether the conformation of hTF upon binding to V(IV)O(2+) or to its complexes is changed. Circular dichroism (CD) spectra measured for solutions containing V(IV)O(2+) and apo-hTF, and V(IV)O-maltol and apo-hTF, clearly indicate that hTF-V(IV)O-maltol ternary species form with a V(IV)O:maltol stoichiometry of 1:1. For V(IV)O salts and several V(IV)O(carrier)n complexes (carrier ligand=maltolato, dhp, picolinato and dipicolinato) (Hdhp=1,2-dimethyl-3-hydroxy-4-pyridinone) the maximum number of V(IV)O(2+) bound per mole of hTF is determined to be ~2 or lower in all cases. The binding of V(IV)O to apo-hTF most certainly involves several amino acid residues of the Fe-binding site, and as concluded by urea gel electrophoresis experiments, the formation of (V(IV)O)2hTF species may occur with the closing of the hTF conformation as is the case in (Fe(III))2hTF, which is an essential feature for the transferrin receptor recognition.
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Affiliation(s)
- Sameena Mehtab
- Centro Química Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
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Transport of the anti-diabetic VO2+ complexes formed by pyrone derivatives in the blood serum. J Inorg Biochem 2012; 115:87-99. [PMID: 22926028 DOI: 10.1016/j.jinorgbio.2012.04.020] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 03/20/2012] [Accepted: 04/20/2012] [Indexed: 11/22/2022]
Abstract
The biotransformation in the blood serum of the two anti-diabetic agents [VO(ema)(2)] - or BEOV - and [VO(koj)(2)] formed by ethylmaltol (Hema) and kojic acid (Hkoj) was studied with EPR spectroscopy, pH-potentiometry and DFT calculations. For comparison, the behavior of the systems with tropolone (Htrop) was also analyzed. The interaction of [VO(ema)(2)] and [VO(koj)(2)] with the most important bioligands of the serum, lactic (Hlact) and citric acid (H(3)citr), human serum transferrin (hTf), human serum albumin (HSA) and immunoglobulin G (IgG) was examined and discussed. Among the several mixed species observed, cis-VO(carrier)(2)(hTf), cis-VO(carrier)(2)(HSA) and cis-VO(carrier)(2)(IgG), where carrier is ethylmaltolate or kojate, with a His-N of the protein coordinated in the equatorial position, are plausible candidates for the transport processes of the drug toward the target organs. The values of the logβ are in the range 19.6-19.8 for the species formed by ethylmaltol and 17.4-17.6 for those formed by kojic acid. The formation of such species was confirmed through pH-titrations of the model systems VO(2+)/carrier/1-MeIm and VO(2+)/carrier/Ac-his, where 1-MeIm and Ac-his are 1-methylimidazole and N-acetylhistamine, and DFT calculations of (51)V A(z) of the model species cis-[VO(carrier)(2)(1-MeIm)] and cis-[VO(carrier)(2)(Ac-his)]. The values of the stability constants for the mixed species observed were used to predict the biodistribution of VO(2+) ion between the blood serum components for concentrations of 1, 10 and 50 μM.
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Le Du A, Sabatié-Gogova A, Morgenstern A, Montavon G. Is DTPA a good competing chelating agent for Th(IV) in human serum and suitable in targeted alpha therapy? J Inorg Biochem 2012; 109:82-9. [DOI: 10.1016/j.jinorgbio.2011.12.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Revised: 11/15/2011] [Accepted: 12/16/2011] [Indexed: 10/14/2022]
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Sanna D, Bíró L, Buglyó P, Micera G, Garribba E. Biotransformation of BMOV in the presence of blood serum proteins. Metallomics 2012; 4:33-6. [DOI: 10.1039/c1mt00161b] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Application of modeling calculations in the description of metal ion distribution of bioactive compounds in biological systems. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2011.07.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bou-Abdallah F, Terpstra TR. The thermodynamic and binding properties of the transferrins as studied by isothermal titration calorimetry. Biochim Biophys Acta Gen Subj 2011; 1820:318-25. [PMID: 21843602 DOI: 10.1016/j.bbagen.2011.07.013] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2011] [Revised: 07/16/2011] [Accepted: 07/21/2011] [Indexed: 02/01/2023]
Abstract
BACKGROUND In mammals, serum-transferrins transport iron from the neutral environment of the blood to the cytoplasm by receptor-mediated endocytosis. Extensive in-vitro studies have focused on the thermodynamics and kinetics of Fe(3+) binding to a number of transferrins. However, little attention has been given to the thermodynamic characterization of the interaction of transferrin with its receptor. SCOPE OF REVIEW Iron-loaded transferrin (Tf) binds with high affinity to the specific transferrin receptor (TfR) on the cell surface. The Tf-TfR complex is then internalized via receptor mediated endocytosis into an endosome where iron is released. Here, we provide an overview of recent studies that have used ITC to quantify the interaction of various metal ions with transferrin and highlight our current understanding of the thermodynamics of the transferrin-transferrin receptor system at physiological pH. GENERAL SIGNIFICANCE The interaction of the iron-loaded transferrin with the transferrin receptor is a key cellular process that occurs during the normal course of iron metabolism. Understanding the thermodynamics of this interaction is important for iron homeostasis since the physiological requirement of iron must be appropriately maintained to avoid iron-related diseases. MAJOR CONCLUSIONS The thermodynamic data revealed stoichiometric binding of all tested metal ions to transferrin with very high affinities ranging between 10(17) and 10(22)M(-1). Iron-loaded transferrin (monoferric or diferric) is shown to bind avidly (K~10(7)-10(8)M(-1)) to the receptor at neutral pH with a stoichiometry of one Tf molecule per TfR monomer. Significantly, both the N- and the C-lobe contribute to the binding interaction which is shown to be both enthalpically and entropically driven. This article is part of a Special Issue entitled Transferrins: Molecular mechanisms of iron transport and disorders.
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Affiliation(s)
- Fadi Bou-Abdallah
- Department of Chemistry, State University of New York at Potsdam, Potsdam, NY 13676, USA.
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Competitive binding of Fe3+, Cr3+, and Ni2+ to transferrin. J Biol Inorg Chem 2011; 16:913-21. [PMID: 21678080 DOI: 10.1007/s00775-011-0792-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Accepted: 05/18/2011] [Indexed: 10/18/2022]
Abstract
Competitive binding of Fe(3+), Cr(3+), and Ni(2+) to transferrin (Tf) was investigated at various physiological iron to Tf concentration ratios. Loading percentages for these metal ions are based on a two M(n+) to one Tf (i.e., 100% loading) stoichiometry and were determined using a particle beam/hollow cathode-optical emission spectroscopy (PB/HC-OES) method. Serum iron concentrations typically found in normal, iron-deficient, iron-deficient from chronic disease, iron-deficient from inflammation, and iron-overload conditions were used to determine the effects of iron concentration on iron loading into Tf. The PB/HC-OES method allows the monitoring of metal ions in competition with Fe(3+) for Tf binding. Iron-overload concentrations impeded the ability of chromium (15.0 μM) or nickel (10.3 μM) to load completely into Tf. Low Fe(3+) uptake by Tf under iron-deficient or chronic disease iron concentrations limited Ni(2+) loading into Tf. Competitive binding kinetic studies were performed with Fe(3+), Cr(3+), and Ni(2+) to determine percentages of metal ion uptake into Tf as a function of time. The initial rates of Fe(3+) loading increased in the presence of nickel or chromium, with maximal Fe(3+) loading into Tf in all cases reaching approximately 24%. Addition of Cr(3+) to 50% preloaded Fe(3+)-Tf showed that excess chromium (15.0 μM) displaced roughly 13% of Fe(3+) from Tf, resulting in 7.6 ± 1.3% Cr(3+) loading of Tf. The PB/HC-OES method provides the ability to monitor multiple metal ions competing for Tf binding and will help to understand metal competition for Tf binding.
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Sanna D, Micera G, Garribba E. Interaction of VO2+ ion and some insulin-enhancing compounds with immunoglobulin G. Inorg Chem 2011; 50:3717-28. [PMID: 21434616 DOI: 10.1021/ic200087p] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Complexation of VO(2+) ion with the most abundant class of human immunoglobulins, immunoglobulin G (IgG), was studied using EPR spectroscopy. Differently from the data in the literature which report no interaction of IgG with vanadium, in the binary system VO(2+)/IgG at least three sites with comparable strength were revealed. These sites, named 1, 2, and 3, seem to be not specific, and the most probable candidates for metal ion coordination are histidine-N, aspartate-O or glutamate-O, and serinate-O or threoninate-O. The mean value for the association constant of (VO)(x)IgG, with x = 3-4, is log β = 10.3 ± 1.0. Examination of the ternary systems formed by VO(2+) with IgG and human serum transferrin (hTf) and human serum albumin (HSA) allows one to find that the order of complexing strength is hTf ≫ HSA ≈ IgG. The behavior of the ternary systems with IgG and one insulin-enhancing agent, like [VO(6-mepic)(2)], cis-[VO(pic)(2)(H(2)O)], [VO(acac)(2)], and [VO(dhp)(2)], where 6-mepic, pic, acac, and dhp indicate the deprotonated forms of 6-methylpicolinic and picolinic acids, acetylacetone, and 1,2-dimethyl-3-hydroxy-4(1H)-pyridinone, is very similar to the corresponding systems with albumin. In particular, at the physiological pH value, VO(6-mepic)(IgG)(OH), cis-VO(pic)(2)(IgG), and cis-VO(dhp)(2)(IgG) are formed. In such species, IgG coordinates nonspecifically VO(2+) through an imidazole-N belonging to a histidine residue exposed on the protein surface. For cis-VO(dhp)(2)(IgG), log β is 25.6 ± 0.6, comparable with that of the analogous species cis-VO(dhp)(2)(HSA) and cis-VO(dhp)(2)(hTf). Finally, with these new values of log β, the predicted percent distribution of an insulin-enhancing VO(2+) agent between the high molecular mass (hTf, HSA, and IgG) and low molecular mass (lactate) components of the blood serum at physiological conditions is calculated.
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Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
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Lodyga-Chruscinska E, Micera G, Garribba E. Complex Formation in Aqueous Solution and in the Solid State of the Potent Insulin-Enhancing VIVO2+ Compounds Formed by Picolinate and Quinolinate Derivatives. Inorg Chem 2011; 50:883-99. [DOI: 10.1021/ic101475x] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elzbieta Lodyga-Chruscinska
- Institute of General Food Chemistry, Technical University of Lodz, ul. Stefanowskiego 4/10, PL-90924, Lodz, Poland
| | - Giovanni Micera
- Dipartimento di Chimica e Centro Interdisciplinare per lo Sviluppo della Ricerca Biotecnologica e per lo Studio della Biodiversità della Sardegna, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
| | - Eugenio Garribba
- Dipartimento di Chimica e Centro Interdisciplinare per lo Sviluppo della Ricerca Biotecnologica e per lo Studio della Biodiversità della Sardegna, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
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Sanna D, Buglyó P, Micera G, Garribba E. A quantitative study of the biotransformation of insulin-enhancing VO2+ compounds. J Biol Inorg Chem 2010; 15:825-39. [DOI: 10.1007/s00775-010-0647-9] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2009] [Accepted: 03/02/2010] [Indexed: 11/24/2022]
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Quarles Jr. CD, Brumaghim JL, Marcus RK. Instrumental comparison of the determination of Cr3+ uptake by human transferrin. Metallomics 2010; 2:792-9. [DOI: 10.1039/c0mt00032a] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bytzek AK, Enyedy ÃA, Kiss T, Keppler BK, Hartinger CG. Biodistribution of anti-diabetic Zn(II) complexes in human serum andin vitroprotein-binding studies by means of CZEâICP-MS. Electrophoresis 2009; 30:4075-82. [DOI: 10.1002/elps.200900212] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Sanna D, Micera G, Garribba E. New Developments in the Comprehension of the Biotransformation and Transport of Insulin-Enhancing Vanadium Compounds in the Blood Serum. Inorg Chem 2009; 49:174-87. [DOI: 10.1021/ic9017213] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daniele Sanna
- Istituto CNR di Chimica Biomolecolare, Trav. La Crucca 3, I-07040 Sassari, Italy
| | - Giovanni Micera
- Dipartimento di Chimica e Centro Interdisciplinare per lo Sviluppo della Ricerca Biotecnologica e per lo Studio della Biodiversità della Sardegna, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
| | - Eugenio Garribba
- Dipartimento di Chimica e Centro Interdisciplinare per lo Sviluppo della Ricerca Biotecnologica e per lo Studio della Biodiversità della Sardegna, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy
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Jakusch T, Dean A, Oncsik T, Bényei AC, Di Marco V, Kiss T. Vanadate complexes in serum: a speciation modeling study. Dalton Trans 2009:212-20. [PMID: 20023952 DOI: 10.1039/b914849c] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The speciations of two drug candidate ligands, 2-hydroxypyridine-N-oxide (Hhpno) and 2-mercaptopyridine-N-oxide (Hmpno), with vanadate (V(V)) were determined at 25.0 degrees C and 0.20 mol dm(-3) KCl by pH-metric and (51)V-NMR methods. At pH 7.4, the two predominant compounds with both ligands are the VO(2)L(2) and VO(2)L(OH). NH(4)[VO(2)(hpno)(2)] x 3 H(2)O was prepared in solid form, and its crystal structure was determined by X-ray diffraction. The stabilities of the complexes VO(2)L(2) of five drug candidate ligands were compared at pH 7.4. In view of the stability sequence hpno > maltol approximately hdp (Hhdp: 3-hydroxy-1,2-dimethyl-4-pyridinone) >> mpno > picolinic acid, the first two of these ligands were chosen for equilibrium studies with apotransferrin (apoTf) competition. The V(V)-apoTf stability constants (log K(1) = 6.03 +/- 0.10; log K(2) = 5.46 +/- 0.18) determined by (51)V-NMR spectroscopy were confirmed by ultrafiltration. Both methods proved that there seems to be no hydrogencarbonate-vanadate competition for the apoTf anion-binding positions. The other potential high molecular mass V(V) binder in the serum is human serum albumin (HSA). As no interaction was detected by (51)V-NMR spectroscopy or fluorimetry, the binding properties of HSA were quantified on the basis of literature data. As a final conclusion, speciation modeling calculations suggest that, under serum conditions, apoTf is probably the primary metal ion binder, even in the presence of the most stable V(V) carrier ligands hpno and maltol and HSA plays a negligible role in V(V) binding.
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Affiliation(s)
- Tamás Jakusch
- Department of Inorganic and Analytical Chemistry, University of Szeged, P.O. Box 440, Szeged, H-6701, Hungary
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Quarles CD, Brumaghim JL, Marcus RK. Simultaneous multiple element detection by particle beam/hollow cathode-optical emission spectroscopy as a tool for metallomic studies: determinations of metal binding with apo-transferrin. Metallomics 2009; 2:154-61. [PMID: 21069147 DOI: 10.1039/b916073f] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Particle beam/hollow cathode-optical emission spectroscopy (PB/HC-OES) is presented as a tool for the determination of metal ion loading in transferrin (Tf). The elemental specificity of optical emission spectroscopy provides a means of assessing metal ion concentrations as well as the relative amounts of metal per unit protein concentration (up to 2 moles of Fe per mole of protein). The PB/HC-OES method allows for the simultaneous detection of metal content (Fe (I) 371.99, Ni (I) 341.41 nm, Zn (I) 213.86 nm, and Ag (I) 338.28 nm in this case), as well as elemental carbon and sulfur (C (I) 156.14 nm and S (I) 180.73 nm) that are reflective of the protein composition and concentration. Quantification for the metal species is based on calibration functions derived from aqueous solutions, with limits of detection for the entire suite being less than 1.0 μM. Determinations in this manner eliminate much of the ambiguity inherent in UV-VIS absorbance determinations of Tf metal binding. Validation of this method is obtained by analyzing loading response of Fe(3+) into Tf using the PB/HC-OES method and comparing the results with those of the standard UV-VIS absorbance method. Maximum Fe(3+) loading of Tf (based on the number of available binding sites) was determined to be 71.2 ± 4.7% by the PB/HC-OES method and 67.5 ± 2.5% for the UV-VIS absorbance method. Element emission ratios between the dopant metals and the carbon and sulfur protein constituents allow for concentration independent determinations of metal binding into Tf. Loading percentages were determined for Ni(2+), Zn(2+), and Ag(+) into Tf with maximum loading values of 19.5 ± 0.4%, 41.0 ± 4.4%, and 141.2 ± 4.3%, respectively. While of no apparent biological significance, Ag(+) presents an interesting case as a surrogate for Pt(2+), whose binding with Tf has shown to be quite different from the other metals. A different mode from the others is indeed observed, and is consistent with conjecture on the Pt(2+) mechanisms. Competitive binding studies not easily performed using absorbance spectroscopy are easily performed by simultaneous, multielement analysis, reflective of the metals and the protein content. In this work, there is clear competition between and Fe(3+) and Zn(2+) for binding in the C-terminus lobe of Tf, while Ni(2+) binds within the N-terminus lobe. Addition of Ag(+) to this mixture does not affect the other metals' distributions, but reflects binding at other protein sites.
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Affiliation(s)
- C Derrick Quarles
- Department of Chemistry, Biosystems Research Complex, Clemson University, Clemson, SC 29634-0973, USA
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Racine R, Moisy P, Paquet F, Métivier H, Madic C. In vitro study of the interaction between neptunium ions and aposerumtransferrin by absorption spectrophotometry and ultrafiltration: the case of Np(V). RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.91.2.115.19987] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The interaction between Np(V) and human aposerumtransferrin (apoTf) was studied in vitro under physiological conditions (37°C, pH 7.4, [NaCl]=0.15 M, [HEPES]=5×10-2 M) by UV-visible and near-IR absorption spectrophotometry and by ultrafiltration. It was found that Np(V) was bound in small fraction (<12%) to apoTf, and that the role of carbonate and citrate anions in binding is more competitive than synergistic. The complexes NpO2CO3
- and NpO2Cit2- tend to form rather than the Np(V)-apoTf complex. Np(V) binding on apoTf appears to be pH-dependent and reversible. Displacement experiments with FeIIINTA showed non-specific binding, suggesting a weak interaction between Np(V) and apoTf different from the reactions involving transferrin-specific sites with other metallic ions, such as Fe(III). The low overall charge, the size and the geometry of the linear di-oxocation NpO2
+ could account for the weak interaction between Np(V) and human transferrin.
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Evaluation of ovotransferrin-matrix metal-affinity metalloprotein chromatography for Pu(IV) separations. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.91.12.697.23418] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Metal-Affinity metalloprotein chromatography has been suggested to have potential for selectively removing actinides from solution. To evaluate this potential, characterization of Pu(IV) and Fe(III) binding to an ovotransferrin-Sepharose™ 4B matrix, with oxalate and carbonate synergistic anions, was performed. Metal binding capacity was determined for metal concentrations ranging from 2×10-6 to 1×10-3M Fe(III) and 2.9×10-5 to 2.6×10-4M Pu(IV), where both metals were added as a solution of 10:1 nitrilotriacetic acid:metal. Metal binding capacity was also determined over the pH range 3.0 to 9.2. The metal binding properties of the immobilized ovotransferrin were found to differ from those reported for free-protein studies. Distribution coefficients were low: for metal solution concentrations of 0.02, 0.04, 0.10, and 0.20mM, coefficients were 540, 180, 23, and 12mL/g for Fe(III) and 20, 12, 7.2, and 6.0mL/g for Pu(IV), respectively. The capacity of the material was less dependent on pH than expected, varying by only two μmoles metal/g matrix for both Fe(III) and Pu(IV) over the pH range of 4.2 to 9.5. This study illustrates limitations of metalloprotein chromatography for Pu(IV) separation.
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Interaction of VO2+ ion with human serum transferrin and albumin. J Inorg Biochem 2009; 103:648-55. [DOI: 10.1016/j.jinorgbio.2009.01.002] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2008] [Revised: 12/29/2008] [Accepted: 12/30/2008] [Indexed: 11/18/2022]
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Jakusch T, Hollender D, Enyedy ÉA, González CS, Montes-Bayón M, Sanz-Medel A, Costa Pessoa J, Tomaz I, Kiss T. Biospeciation of various antidiabetic VIVO compounds in serum. Dalton Trans 2009:2428-37. [DOI: 10.1039/b817748a] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Weaver KD, Heymann JJ, Mehta A, Roulhac PL, Anderson DS, Nowalk AJ, Adhikari P, Mietzner TA, Fitzgerald MC, Crumbliss AL. Ga3+ as a mechanistic probe in Fe3+ transport: characterization of Ga3+ interaction with FbpA. J Biol Inorg Chem 2008; 13:887-98. [PMID: 18461372 DOI: 10.1007/s00775-008-0376-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2008] [Accepted: 04/04/2008] [Indexed: 10/22/2022]
Abstract
The obligate human pathogens Haemophilus influenzae, Neisseria gonorrhoeae, and N. meningitidis utilize a highly conserved, three-protein ATP-binding cassette transporter (FbpABC) to shuttle free Fe(3+) from the periplasm and across the cytoplasmic membrane. The periplasmic binding protein, ferric binding protein (FbpA), is capable of transporting other trivalent cations, including Ga(3+), which, unlike Fe(3+), is not redox-active. Because of a similar size and charge as Fe(3+), Ga(3+) is widely used as a non-redox-active Fe(3+) substitute for studying metal complexation in proteins and bacterial populations. The investigations reported here elucidate the similarities and differences in FbpA sequestration of Ga(3+) and Fe(3+), focusing on metal selectivity and the resulting transport function. The thermodynamic binding constant for Ga(3+) complexed with FbpA at pH 6.5, in 50 mM 4-morpholineethanesulfonic acid, 200 mM KCl, 5 mM KH(2)PO(4) was determined by UV-difference spectroscopy as log K'eff=13.7+/-0.6. This represents a 10(5)-fold weaker binding relative to Fe(3+) at identical conditions. The unfolding/refolding behavior of Ga(3+) and Fe(3+) holo-FbpA were also studied using a matrix-assisted laser desorption/ionization time-of-flight mass spectroscopy technique, stability of unpurified proteins from rates of H/D exchange (SUPREX). This analysis indicates significant differences between Fe(3+) and Ga(3+) sequestration with regard to protein folding behavior. A series of kinetic experiments established the lability of the Ga(3+)FbpA-PO(4) assembly, and the similarities/differences of stepwise loading of Fe(3+) into apo- or Ga(3+)-loaded FbpA. These biophysical characterization data are used to interpret FbpA-mediated Ga(3+) transport and toxicity in cell culture studies.
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Kiss T, Jakusch T, Hollender D, Dörnyei Á, Enyedy ÉA, Pessoa JC, Sakurai H, Sanz-Medel A. Biospeciation of antidiabetic VO(IV) complexes. Coord Chem Rev 2008. [DOI: 10.1016/j.ccr.2007.09.011] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Du H, Xiang J, Tang Y, Wang Z. Quercetin-induced Conformational Change of Human Serum Transferrin. CHEM LETT 2007. [DOI: 10.1246/cl.2007.84] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Ansoborlo E, Prat O, Moisy P, Den Auwer C, Guilbaud P, Carriere M, Gouget B, Duffield J, Doizi D, Vercouter T, Moulin C, Moulin V. Actinide speciation in relation to biological processes. Biochimie 2006; 88:1605-18. [PMID: 16996675 DOI: 10.1016/j.biochi.2006.06.011] [Citation(s) in RCA: 151] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2006] [Accepted: 06/26/2006] [Indexed: 11/21/2022]
Abstract
In case of accidental release of radionuclides into the environment, actinides represent a severe health risk to human beings following internal contamination (inhalation, ingestion or wound). For a better understanding of the actinide behaviour in man (in term of metabolism, retention, excretion) and in specific biological systems (organs, cells or biochemical pathways), it is of prime importance to have a good knowledge of the relevant actinide solution chemistry and biochemistry, in particular of the thermodynamic constants needed for computing actinide speciation. To a large extent, speciation governs bioavailability and toxicity of elements and has a significant impact on the mechanisms by which toxics accumulate in cell compartments and organs and by which elements are transferred and transported from cell to cell. From another viewpoint, speciation is the prerequisite for the design and success of potential decorporation therapies. The purpose of this review is to present the state of the art of actinide knowledge within biological media. It is also to discuss how actinide speciation can be determined or predicted and to highlight the areas where information is lacking with the aim to encourage new research efforts.
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Affiliation(s)
- Eric Ansoborlo
- CEA/DEN/DRCP/CETAMA, VRH-Marcoule, BP 17171, 30207 Bagnols sur Cèze, France.
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Kiss T, Jakusch T, Bouhsina S, Sakurai H, Enyedy ÉA. Binding Constant of VIVO to Transferrin. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600314] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Nagaoka MH, Maitani T. Binding affinity of aluminium to human serum transferrin and effects of carbohydrate chain modification as studied by HPLC/high-resolution ICP-MS--speciation of aluminium in human serum. J Inorg Biochem 2006; 99:1887-94. [PMID: 16139893 DOI: 10.1016/j.jinorgbio.2005.06.034] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2005] [Revised: 06/21/2005] [Accepted: 06/27/2005] [Indexed: 11/28/2022]
Abstract
Aluminium (Al) in the blood is bound to transferrin (Tf), a glycoprotein of about 80kDa that is characterized by its need for a synergistic anion. In this focused review, the binding affinity of Al to Tf is surveyed in the context of our recent studies using on-line high-performance liquid chromatography/high-resolution inductively coupled plasma mass spectrometry (HPLC/HR-ICP-MS). Al in human serum without any in vitro Al-spikes was present in a form bound to the N-lobe site of Tf. The influences of sialic acid in the carbohydrate chain of human serum Tf (hTf) were studied using asialo-hTf, obtained by treatment with sialidase. The binding affinity of Fe was similar between asialo-hTf and native-hTf, while that of Al for asialo-hTf was larger than that for native-hTf, especially in the presence of oxalate, a synergistic anion. The above findings are discussed in relation to diseases in which the serum concentrations of carbohydrate-deficient Tf and oxalate are augmented.
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Affiliation(s)
- Megumi Hamano Nagaoka
- National Institute of Health Sciences, Kamiyoga 1-18-1, Setagaya, Tokyo 158-8501, Japan.
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Alexeev D, Zhu H, Guo M, Zhong W, Hunter DJB, Yang W, Campopiano DJ, Sadler PJ. A novel protein-mineral interface. Nat Struct Mol Biol 2003; 10:297-302. [PMID: 12598891 DOI: 10.1038/nsb903] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2002] [Accepted: 01/06/2003] [Indexed: 11/09/2022]
Abstract
Transferrins transport Fe3+ and other metal ions in mononuclear-binding sites. We present the first evidence that a member of the transferrin superfamily is able to recognize multi-nuclear oxo-metal clusters, small mineral fragments that are the most abundant forms of many metals in the environment. We show that the ferric ion-binding protein from Neisseria gonorrhoeae (nFbp) readily binds clusters of Fe3+, Ti4+, Zr4+ or Hf4+ in solution. The 1.7 A resolution crystal structure of Hf-nFbp reveals three distinct types of clusters in an open, positively charged cleft between two hinged protein domains. A di-tyrosyl cluster nucleation motif (Tyr195-Tyr196) is situated at the bottom of this cleft and binds either a trinuclear oxo-Hf cluster, which is capped by phosphate, or a pentanuclear cluster, which in turn can be capped with phosphate. This first high-resolution structure of a protein-mineral interface suggests a novel metal-uptake mechanism and provides a model for protein-mediated mineralization/dissimilation, which plays a critical role in geochemical processes.
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Affiliation(s)
- Dmitriy Alexeev
- Institute of Cell and Molecular Biology, Michael Swann Building, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JR, UK
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Nagaoka MH, Yamazaki T, Maitani T. Binding patterns of vanadium ions with different valence states to human serum transferrin studied by HPLC/high-resolution ICP-MS. Biochem Biophys Res Commun 2002; 296:1207-14. [PMID: 12207902 DOI: 10.1016/s0006-291x(02)02067-3] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Vanadium (V) is an essential metal for mammals and has different valence states. In blood, V is bound to serum transferrin (Tf), a glycoprotein which has two metal-binding sites, and carbonate is generally required for the binding. In this study, the binding patterns of V(III), V(IV), and V(V) to human serum Tf (hTf) were analyzed using an HPLC system equipped with an anion-exchange column and directly connected to a high-resolution inductively coupled plasma-mass spectrometer for metal detection (51V). In affinity to hTf, the three ions were ranked V(III)>V(IV)>V(V) in the presence of bicarbonate and V(III) reverse congruent V(IV)>V(V) in the absence. Intermediates in the "open forms" binding to the respective sites were detected at the initial stage. V(IV) and V(V) were bound to the N-lobe site in the "closed form" and "open form," respectively. In the absence of bicarbonate, V ions with respective valence states were bound to hTf in the "open form." In terms of binding to hTf, tri-valent V was most favorable in the presence of bicarbonate.
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Affiliation(s)
- Megumi Hamano Nagaoka
- National Institute of Health Sciences, Kamiyoga 1-18-1, Setagaya, 158-8501, Tokyo, Japan
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Beatty EJ, Zhong W, Kubal G, Houldershaw D, Goodfellow JM, Sadler PJ. Histidine pK(a) values for the N-lobe of human transferrin: effect of substitution of binding site Asp by Ser (D63S). J Inorg Biochem 2002; 88:403-9. [PMID: 11897357 DOI: 10.1016/s0162-0134(01)00352-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The pK(a) values have been determined for eight of the nine histidine residues and the amino terminus of the N-lobe of human apo-transferrin (hTF/2N), and for seven of the nine histidine residues and the amino terminus of the protein Asp63Ser hTF/2N containing a mutation of the Fe(3+)-ligand Asp63 to Ser63. Calculations suggested that substitution of aspartate by serine would result in decreases of the pK(a) values of most of the histidine residues in the protein. This was found to be the case experimentally, and allowed assignment of the varepsilonCH resonance of His249. For the wild-type protein, the His residue with a pK(a) of 7.40 was assigned as His249, whereas for the mutant, no observable His residue had a pK(a) value higher than 6.9. The protonated form of His249 appears to be stabilised by interactions with Asp63, and the high pK(a) value may be critical for ensuring the release of iron at endosomal pH (5.5). The mutation lowered the apparent binding constant of hTF/2N for the synergistic anion oxalate from log K 4.0 to log K 3.3. (1)H NMR spectral changes induced by Ga(3+) binding to the mutant are compared to those observed for the wild-type protein.
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Affiliation(s)
- Emma J Beatty
- Department of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, UK
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