1
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Tóth A, Sajdik K, Gyurcsik B, Nafaee ZH, Wéber E, Kele Z, Christensen NJ, Schell J, Correia JG, Sigfridsson Clauss KGV, Pittkowski RK, Thulstrup PW, Hemmingsen L, Jancsó A. As III Selectively Induces a Disorder-to-Order Transition in the Metalloid Binding Region of the AfArsR Protein. J Am Chem Soc 2024; 146:17009-17022. [PMID: 38820242 PMCID: PMC11212059 DOI: 10.1021/jacs.3c11665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 05/22/2024] [Accepted: 05/23/2024] [Indexed: 06/02/2024]
Abstract
Arsenic is highly toxic and a significant threat to human health, but certain bacteria have developed defense mechanisms initiated by AsIII binding to AsIII-sensing proteins of the ArsR family. The transcriptional regulator AfArsR responds to AsIII and SbIII by coordinating the metalloids with three cysteines, located in a short sequence of the same monomer chain. Here, we characterize the binding of AsIII and HgII to a model peptide encompassing this fragment of the protein via solution equilibrium and spectroscopic/spectrometric techniques (pH potentiometry, UV, CD, NMR, PAC, EXAFS, and ESI-MS) combined with DFT calculations and MD simulations. Coordination of AsIII changes the peptide structure from a random-coil to a well-defined structure of the complex. A trigonal pyramidal AsS3 binding site is formed with almost exactly the same structure as observed in the crystal structure of the native protein, implying that the peptide possesses all of the features required to mimic the AsIII recognition and response selectivity of AfArsR. Contrary to this, binding of HgII to the peptide does not lead to a well-defined structure of the peptide, and the atoms near the metal binding site are displaced and reoriented in the HgII model. Our model study suggests that structural organization of the metal site by the inducer ion is a key element in the mechanism of the metalloid-selective recognition of this protein.
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Affiliation(s)
- Annamária Tóth
- Department
of Molecular and Analytical Chemistry, University
of Szeged, Dóm
tér 7-8, H-6720 Szeged, Hungary
| | - Kadosa Sajdik
- Department
of Molecular and Analytical Chemistry, University
of Szeged, Dóm
tér 7-8, H-6720 Szeged, Hungary
| | - Béla Gyurcsik
- Department
of Molecular and Analytical Chemistry, University
of Szeged, Dóm
tér 7-8, H-6720 Szeged, Hungary
| | - Zeyad H. Nafaee
- Department
of Molecular and Analytical Chemistry, University
of Szeged, Dóm
tér 7-8, H-6720 Szeged, Hungary
| | - Edit Wéber
- Department
of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
- HUN-REN-SZTE
Biomimetic Systems Research Group, Dóm tér 8, H-6720 Szeged, Hungary
| | - Zoltan Kele
- Department
of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - Niels Johan Christensen
- Department
of Chemistry, Faculty of Science, University
of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark
| | - Juliana Schell
- Institute
for Materials Science and Center for Nanointegration Duisburg-Essen
(CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
- European
Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland
| | - Joao Guilherme Correia
- Centro de
Cięncias e Tecnologias Nucleares, Departamento de Engenharia
e Cięncias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal
- European
Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland
| | | | - Rebecca K. Pittkowski
- Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Kobenhavn Ø, Denmark
| | - Peter Waaben Thulstrup
- Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Kobenhavn Ø, Denmark
| | - Lars Hemmingsen
- Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Kobenhavn Ø, Denmark
| | - Attila Jancsó
- Department
of Molecular and Analytical Chemistry, University
of Szeged, Dóm
tér 7-8, H-6720 Szeged, Hungary
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2
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Fischer N, Tóth A, Jancsó A, Thulstrup P, Diness F. Inducing α-Helicity in Peptides by Silver Coordination to Cysteine. Chemistry 2024; 30:e202304064. [PMID: 38456607 DOI: 10.1002/chem.202304064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 02/29/2024] [Accepted: 03/01/2024] [Indexed: 03/09/2024]
Abstract
Short peptide sequences consisting of two cysteine residues separated by three other amino acids display complete change from random coil to α-helical secondary structure in response to addition of Ag+ ions. The folded CXXXC/Ag+ complex involves formation of multinuclear Ag+ species and is stable in a wide pH range from below 3 to above 8. The complex is stable through reversed-phase HPLC separation as well as towards a physiological level of chloride ions, based on far-UV circular dichroism spectroscopy. In electrospray MS under acidic conditions a peptide dimer with four Ag+ ions bound was observed, and modelling based on potentiometric experiments supported this to be the dominating complex at neutral pH together with a peptide dimer with 3 Ag+ and one proton at lower pH. The complex was demonstrated to work as a N-terminal nucleation site for inducing α-helicity into longer peptides. This type of silver-mediated peptide assembly and folding may be of more general use for stabilizing not only peptide folding but also for controlling oligomerization even under acidic conditions.
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Affiliation(s)
- Niklas Fischer
- Department of Science and Environment, Roskilde University, Universitetsvej 1, 4000, Roskilde, Denmark
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, København Ø, Denmark
| | - Annamária Tóth
- Department of Molecular and Analytical Chemistry, University of Szeged, Dómtér 7-8, H-6720, Szeged, Hungary
| | - Attila Jancsó
- Department of Molecular and Analytical Chemistry, University of Szeged, Dómtér 7-8, H-6720, Szeged, Hungary
| | - Peter Thulstrup
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, København Ø, Denmark
| | - Frederik Diness
- Department of Science and Environment, Roskilde University, Universitetsvej 1, 4000, Roskilde, Denmark
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, København Ø, Denmark
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3
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Interactions of an Artificial Zinc Finger Protein with Cd(II) and Hg(II): Competition and Metal and DNA Binding. INORGANICS 2023. [DOI: 10.3390/inorganics11020064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Cys2His2 zinc finger proteins are important for living organisms, as they—among other functions—specifically recognise DNA when Zn(II) is coordinated to the proteins, stabilising their ββα secondary structure. Therefore, competition with other metal ions may alter their original function. Toxic metal ions such as Cd(II) or Hg(II) might be especially dangerous because of their similar chemical properties to Zn(II). Most competition studies carried out so far have involved small zinc finger peptides. Therefore, we have investigated the interactions of toxic metal ions with a zinc finger proteins consisting of three finger units and the consequences on the DNA binding properties of the protein. Binding of one Cd(II) per finger subunit of the protein was shown by circular dichroism spectroscopy, fluorimetry and electrospray ionisation mass spectrometry. Cd(II) stabilised a similar secondary structure to that of the Zn(II)-bound protein but with a slightly lower affinity. In contrast, Hg(II) could displace Zn(II) quantitatively (logβ′ ≥ 16.7), demolishing the secondary structure, and further Hg(II) binding was also observed. Based on electrophoretic gel mobility shift assays, the Cd(II)-bound zinc finger protein could recognise the specific DNA target sequence similarly to the Zn(II)-loaded form but with a ~0.6 log units lower stability constant, while Hg(II) could destroy DNA binding completely.
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4
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Balogh RK, Gyurcsik B, Jensen M, Thulstrup PW, Köster U, Christensen NJ, Jensen ML, Hunyadi-Gulyás É, Hemmingsen L, Jancso A. Tying up a loose end: On the role of the C-terminal CCHHRAG fragment of the metalloregulator CueR. Chembiochem 2022; 23:e202200290. [PMID: 35714117 PMCID: PMC9542689 DOI: 10.1002/cbic.202200290] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Indexed: 11/07/2022]
Abstract
The transcriptional regulator CueR is activated by the binding of CuI, AgI, or AuI to two cysteinates in a near‐linear fashion. The C‐terminal CCHHRAG sequence in Escherichia coli CueR present potential additional metal binding ligands and here we explore the effect of deleting this fragment on the binding of AgI to CueR. CD spectroscopic and ESI‐MS data indicate that the high AgI‐binding affinity of WT‐CueR is significantly reduced in Δ7C‐CueR.[111 Ag PAC spectroscopy demonstrates that the WT‐CueR metal site structure (AgS2) is conserved, but less populated in the truncated variant. Thus, the function of the C‐terminal fragment may be to stabilize the two‐coordinate metal site for cognate monovalent metal ions. In a broader perspective this is an example of residues beyond the second coordination sphere affecting metal site physicochemical properties while leaving the structure unperturbed.
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Affiliation(s)
- Ria K Balogh
- University of Szeged: Szegedi Tudomanyegyetem, Department of Inorganic and Analytical Chemistry, HUNGARY
| | - Béla Gyurcsik
- University of Szeged: Szegedi Tudomanyegyetem, Department of Inorganic and Analytical Chemistry, HUNGARY
| | - Mikael Jensen
- Technical University of Denmark: Danmarks Tekniske Universitet, Hevesy Laboratory, Center for Nuclear Technologies, DENMARK
| | - Peter W Thulstrup
- University of Copenhagen: Kobenhavns Universitet, Department of Chemistry, DENMARK
| | - Ulli Köster
- Institut Laue-Langevin, Institut Laue-Langevin, FRANCE
| | - Niels Johan Christensen
- University of Copenhagen: Kobenhavns Universitet, Department of Chemistry, Faculty of Science, DENMARK
| | - Marianne L Jensen
- Niels Bohr Instituttet: Kobenhavns Universitet Niels Bohr Instituttet, Niels Bohr Institute, DENMARK
| | - Éva Hunyadi-Gulyás
- Biological Research Centre, Szeged, Laboratory of Proteomics Research, HUNGARY
| | - Lars Hemmingsen
- University of Copenhagen: Kobenhavns Universitet, Department of Chemistry, DENMARK
| | - Attila Jancso
- University of Szeged, Department of Inorganic and Analytical Chemistry, Dóm tér 7., 6720, Szeged, HUNGARY
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5
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Xu J, Wang J, Ye J, Jiao J, Liu Z, Zhao C, Li B, Fu Y. Metal-Coordinated Supramolecular Self-Assemblies for Cancer Theranostics. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2101101. [PMID: 34145984 PMCID: PMC8373122 DOI: 10.1002/advs.202101101] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 04/25/2021] [Indexed: 05/07/2023]
Abstract
Metal-coordinated supramolecular nanoassemblies have recently attracted extensive attention as materials for cancer theranostics. Owing to their unique physicochemical properties, metal-coordinated supramolecular self-assemblies can bridge the boundary between traditional inorganic and organic materials. By tailoring the structural components of the metal ions and binding ligands, numerous multifunctional theranostic nanomedicines can be constructed. Metal-coordinated supramolecular nanoassemblies can modulate the tumor microenvironment (TME), thus facilitating the development of TME-responsive nanomedicines. More importantly, TME-responsive organic-inorganic hybrid nanomaterials can be constructed in vivo by exploiting the metal-coordinated self-assembly of a variety of functional ligands, which is a promising strategy for enhancing the tumor accumulation of theranostic molecules. In this review, recent advancements in the design and fabrication of metal-coordinated supramolecular nanomedicines for cancer theranostics are highlighted. These supramolecular compounds are classified according to the order in which the coordinated metal ions appear in the periodic table. Furthermore, the prospects and challenges of metal-coordinated supramolecular self-assemblies for both technical advances and clinical translation are discussed. In particular, the superiority of TME-responsive nanomedicines for in vivo coordinated self-assembly is elaborated, with an emphasis on strategies that enhance the accumulation of functional components in tumors for an ideal theranostic outcome.
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Affiliation(s)
- Jiating Xu
- Key Laboratory of Forest Plant EcologyMinistry of EducationCollege of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin150040P. R. China
| | - Jun Wang
- Key Laboratory of Forest Plant EcologyMinistry of EducationCollege of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin150040P. R. China
| | - Jin Ye
- Key Laboratory of Forest Plant EcologyMinistry of EducationCollege of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin150040P. R. China
| | - Jiao Jiao
- Key Laboratory of Forest Plant EcologyMinistry of EducationCollege of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin150040P. R. China
| | - Zhiguo Liu
- Key Laboratory of Forest Plant EcologyMinistry of EducationCollege of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin150040P. R. China
| | - Chunjian Zhao
- Key Laboratory of Forest Plant EcologyMinistry of EducationCollege of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin150040P. R. China
| | - Bin Li
- Key Laboratory of Forest Plant EcologyMinistry of EducationCollege of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin150040P. R. China
| | - Yujie Fu
- Key Laboratory of Forest Plant EcologyMinistry of EducationCollege of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin150040P. R. China
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6
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Balogh RK, Németh E, Jones NC, Hoffmann SV, Jancsó A, Gyurcsik B. A study on the secondary structure of the metalloregulatory protein CueR: effect of pH, metal ions and DNA. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2021; 50:491-500. [PMID: 33907862 DOI: 10.1007/s00249-021-01539-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 01/13/2021] [Accepted: 04/14/2021] [Indexed: 11/30/2022]
Abstract
The response of CueR towards environmental changes in solution was investigated. CueR is a bacterial metal ion selective transcriptional metalloregulator protein, which controls the concentration of copper ions in the cell. Although several articles have been devoted to the discussion of the structural and functional features of this protein, CueR has not previously been extensively characterized in solution. Here, we studied the effect of change in pH, temperature, and the presence of specific or non-specific binding partners on the secondary structure of CueR with circular dichroism (CD) spectroscopy. A rather peculiar reversible pH-dependent secondary structure transformation was observed, elucidated and supplemented with pKa estimation by PROPKA and CpHMD simulations suggesting an important role of His(76) and His(94) in this process. CD experiments revealed that the presence of DNA prevents this structural switch, suggesting that DNA locks CueR in the α-helical-rich form. In contrast to the non-cognate metal ions HgII, CdII and ZnII, the presence of the cognate AgI ion affects the secondary structure of CueR, most probably by stabilizing the metal ion and DNA-binding domains of the protein.
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Affiliation(s)
- Ria K Balogh
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, 6720, Hungary
| | - Eszter Németh
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, 6720, Hungary.,Institute of Enzymology, Genome Stability Research Group, Research Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest, 1117, Hungary
| | - Nykola C Jones
- ISA, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000, Aarhus C, Denmark
| | - Søren Vrønning Hoffmann
- ISA, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000, Aarhus C, Denmark
| | - Attila Jancsó
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, 6720, Hungary
| | - Béla Gyurcsik
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, 6720, Hungary.
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7
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Lukács M, Csilla Pálinkás D, Szunyog G, Várnagy K. Metal Binding Ability of Small Peptides Containing Cysteine Residues. ChemistryOpen 2021; 10:451-463. [PMID: 33830669 PMCID: PMC8028610 DOI: 10.1002/open.202000304] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 02/02/2021] [Indexed: 11/10/2022] Open
Abstract
The Cd(II)-, Pb(II)-, Ni(II)- and Zn(II)-complexes of small terminally protected peptides containing CXXX, XXXC, XCCX, CXn C (n=1-3) sequences have been studied with potentiometric, UV/Vis and CD spectroscopic techniques. The cysteine thiolate group is the primary binding site for all studied metal ions, but the presence of a histidyl or aspartyl side chain in the molecule contributes to the stability of the complexes. For two-cysteine containing peptides the (S- ,S- ) coordinated species are formed in the physiological pH range and the stability increases in the Ni(II)
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Affiliation(s)
- Márton Lukács
- Department of Inorganic and Analytical ChemistryUniversity of DebrecenEgyetem tér 14032DebrecenHungary
| | - Dóra Csilla Pálinkás
- Department of Inorganic and Analytical ChemistryUniversity of DebrecenEgyetem tér 14032DebrecenHungary
| | - Györgyi Szunyog
- Department of Inorganic and Analytical ChemistryUniversity of DebrecenEgyetem tér 14032DebrecenHungary
| | - Katalin Várnagy
- Department of Inorganic and Analytical ChemistryUniversity of DebrecenEgyetem tér 14032DebrecenHungary
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8
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Ozaki M, Yoshida S, Tsuruoka T, Usui K. Intracellular mineralization of gold nanoparticles using gold ion-binding peptides with cell-penetrating ability. Chem Commun (Camb) 2021; 57:725-728. [PMID: 33411858 DOI: 10.1039/d0cc06117d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We developed a system to directly produce gold nanoparticles in cells by intracellular mineralization in lower concentration than conventional methods using a peptide consisting of a cell-penetrating sequence and a gold ion-binding sequence. Furthermore, we could control the uniquely shaped gold nanostructures that were produced by changing peptide structures.
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Affiliation(s)
- Makoto Ozaki
- Faculty of Frontiers of Innovative Research in Science and Technology (FIRST), Konan University, 6500047, Kobe, Japan.
| | - Shuhei Yoshida
- Faculty of Frontiers of Innovative Research in Science and Technology (FIRST), Konan University, 6500047, Kobe, Japan.
| | - Takaaki Tsuruoka
- Faculty of Frontiers of Innovative Research in Science and Technology (FIRST), Konan University, 6500047, Kobe, Japan.
| | - Kenji Usui
- Faculty of Frontiers of Innovative Research in Science and Technology (FIRST), Konan University, 6500047, Kobe, Japan.
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9
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Huang R, Ding Z, Jiang BP, Luo Z, Chen T, Guo Z, Ji SC, Liang H, Shen XC. Artificial Metalloprotein Nanoanalogues: In Situ Catalytic Production of Oxygen to Enhance Photoimmunotherapeutic Inhibition of Primary and Abscopal Tumor Growth. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2004345. [PMID: 33089606 DOI: 10.1002/smll.202004345] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 09/09/2020] [Indexed: 06/11/2023]
Abstract
Photoimmunotherapy (PIT) has shown enormous potential in not only eliminating primary tumors, but also inhibiting abscopal tumor growth. However, the efficacy of PIT is greatly limited by tumor hypoxia, which causes the attenuation of phototherapeutic efficacy and is a feature of the immunosuppressive tumor microenvironment (TME). In this study, one type of brand-new artificial metalloprotein nanoanalogues is developed via reasonable integration of a "phototherapy-enzymatic" RuO2 and a model antigen, ovalbumin (OVA) for enhanced PIT of cancers, namely, RuO2 -hybridized OVA nanoanalogues (RuO2 @OVA NAs). The RuO2 @OVA NAs exhibit remarkable photothermal/photodynamic capabilities under the near-infrared light irradiation. More importantly, the photoacoustic imaging and immunofluorescence staining confirm that RuO2 @OVA NAs can remarkably alleviate hypoxia via in situ catalysis of hydrogen peroxide overexpressed in the TME to produce oxygen (O2 ). This ushers a prospect of concurrently enhancing photodynamic therapy and reversing the immunosuppressive TME. Also, OVA, as a supplement to the immune stimulation induced by phototherapy, can activate immune responses. Finally, further combination with the cytotoxic T-lymphocyte-associated protein 4 checkpoint blockade is reported to effectively eliminate the primary tumor and inhibit distant tumor growth via the abscopal effect of antitumor immune responses, prolonging the survival.
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Affiliation(s)
- Rongtao Huang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin, 541004, P. R. China
| | - Zhaoyang Ding
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin, 541004, P. R. China
| | - Bang-Ping Jiang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin, 541004, P. R. China
| | - Zilan Luo
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin, 541004, P. R. China
| | - Ting Chen
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin, 541004, P. R. China
| | - Zhengxi Guo
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin, 541004, P. R. China
| | - Shi-Chen Ji
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin, 541004, P. R. China
| | - Hong Liang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin, 541004, P. R. China
| | - Xing-Can Shen
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin, 541004, P. R. China
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10
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Padjasek M, Kocyła A, Kluska K, Kerber O, Tran JB, Krężel A. Structural zinc binding sites shaped for greater works: Structure-function relations in classical zinc finger, hook and clasp domains. J Inorg Biochem 2020; 204:110955. [DOI: 10.1016/j.jinorgbio.2019.110955] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 11/08/2019] [Accepted: 12/01/2019] [Indexed: 12/12/2022]
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11
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Yu J, Horsley JR, Abell AD. Unravelling electron transfer in peptide-cation complexes: a model for mimicking redox centres in proteins. Phys Chem Chem Phys 2020; 22:8409-8417. [DOI: 10.1039/d0cp00635a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We provide evidence that bound zinc promotes electron transfer in a peptide by changing the electronic properties of the peptide.
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Affiliation(s)
- Jingxian Yu
- ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP)
- Institute of Photonics and Advanced Sensing (IPAS)
- Department of Chemistry
- The University of Adelaide
- Adelaide
| | - John R. Horsley
- ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP)
- Institute of Photonics and Advanced Sensing (IPAS)
- Department of Chemistry
- The University of Adelaide
- Adelaide
| | - Andrew D. Abell
- ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP)
- Institute of Photonics and Advanced Sensing (IPAS)
- Department of Chemistry
- The University of Adelaide
- Adelaide
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12
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Balogh RK, Gyurcsik B, Hunyadi‐Gulyás É, Schell J, Thulstrup PW, Hemmingsen L, Jancsó A. C-terminal Cysteines of CueR Act as Auxiliary Metal Site Ligands upon Hg II Binding-A Mechanism To Prevent Transcriptional Activation by Divalent Metal Ions? Chemistry 2019; 25:15030-15035. [PMID: 31365771 PMCID: PMC6899792 DOI: 10.1002/chem.201902940] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Indexed: 01/20/2023]
Abstract
Intracellular CuI is controlled by the transcriptional regulator CueR, which effectively discriminates between monovalent and divalent metal ions. It is intriguing that HgII does not activate transcription, as bis-thiolate metal sites exhibit high affinity for HgII . Here the binding of HgII to CueR and a truncated variant, ΔC7-CueR, without the last 7 amino acids at the C-terminus including a conserved CCHH motif is explored. ESI-MS demonstrates that up to two HgII bind to CueR, while ΔC7-CueR accommodates only one HgII . 199m Hg PAC and UV absorption spectroscopy indicate HgS2 structure at both the functional and the CCHH metal site. However, at sub-equimolar concentrations of HgII at pH 8.0, the metal binding site displays an equilibrium between HgS2 and HgS3 , involving cysteines from both sites. We hypothesize that the C-terminal CCHH motif provides auxiliary ligands that coordinate to HgII and thereby prevents activation of transcription.
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Affiliation(s)
- Ria K. Balogh
- Department of Inorganic and Analytical ChemistryUniversity of SzegedDóm tér 76720SzegedHungary
| | - Béla Gyurcsik
- Department of Inorganic and Analytical ChemistryUniversity of SzegedDóm tér 76720SzegedHungary
| | - Éva Hunyadi‐Gulyás
- Laboratory of Proteomics ResearchInstitute of Biochemistry, Biological Research Centre of the Hungarian Academy of SciencesTemesvári krt. 626726SzegedHungary
| | - Juliana Schell
- Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE)University of Duisburg-Essen, 45141 Essen (Germany), European Organization for Nuclear Research (CERN)1211GenevaSwitzerland
| | - Peter W. Thulstrup
- Department of ChemistryUniversity of CopenhagenUniversitetsparken 52100CopenhagenDenmark
| | - Lars Hemmingsen
- Department of ChemistryUniversity of CopenhagenUniversitetsparken 52100CopenhagenDenmark
| | - Attila Jancsó
- Department of Inorganic and Analytical ChemistryUniversity of SzegedDóm tér 76720SzegedHungary
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13
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Cao M, Xing R, Chang R, Wang Y, Yan X. Peptide-coordination self-assembly for the precise design of theranostic nanodrugs. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.06.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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14
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Szekeres LI, Bálint S, Galbács G, Kálomista I, Kiss T, Larsen FH, Hemmingsen L, Jancsó A. Hg 2+ and Cd 2+ binding of a bioinspired hexapeptide with two cysteine units constructed as a minimalistic metal ion sensing fluorescent probe. Dalton Trans 2019; 48:8327-8339. [PMID: 31111849 DOI: 10.1039/c9dt01141b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Hg2+ and Cd2+ complexation of a short hexapeptide, Ac-DCSSCY-NH2 (DY), was studied by pH-potentiometry, UV and NMR spectroscopy and fluorimetry in aqueous solutions and the Hg2+-binding ability of the ligand was also described in an immobilized form, where the peptides were anchored to a hydrophilic resin. Hg2+ was demonstrated to form a 1 : 1 complex with the ligand even at pH = 2.0 while Cd2+ coordination by the peptide takes place only above pH ∼ 3.5. Both metal ions form bis-ligand complexes by the coordination of four Cys-thiolates at ligand excess above pH ∼ 5.5 (Cd2+) and 7.0 (Hg2+). Fluorescence studies demonstrated a Hg2+ induced concentration-dependent quenching of the Tyr fluorescence until a 1 : 1 Hg2+ : DY ratio. The fluorescence emission intensity decreases linearly with the increasing Hg2+ concentration in a range of over two orders of magnitude. The fact that this occurs even in the presence of 1.0 eq. of Cd2+ per ligand reflects a complete displacement of the latter metal ion by Hg2+ from its peptide-bound form. The immobilized peptide was also shown to bind Hg2+ very efficiently even from samples at pH = 2.0. However, the existence of lower affinity binding sites was also demonstrated by binding of more than 1.0 eq. of Hg2+ per immobilized DY molecule under Hg2+-excess conditions. Experiments performed with a mixture of four metal ions, Hg2+, Cd2+, Zn2+ and Ni2+, indicate that this molecular probe may potentially be used in Hg2+-sensing systems under acidic conditions for the measurement of μM range concentrations.
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Affiliation(s)
- Levente I Szekeres
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, H-6720, Hungary.
| | - Sára Bálint
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, H-6720, Hungary.
| | - Gábor Galbács
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, H-6720, Hungary.
| | - Ildikó Kálomista
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, H-6720, Hungary.
| | - Tamás Kiss
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, H-6720, Hungary.
| | - Flemming H Larsen
- Department of Food Science, University of Copenhagen, Rolighedsvej 30, 1958 Frederiksberg C, Denmark
| | - Lars Hemmingsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Attila Jancsó
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, H-6720, Hungary.
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15
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Credille CV, Dick BL, Morrison CN, Stokes RW, Adamek RN, Wu NC, Wilson IA, Cohen SM. Structure-Activity Relationships in Metal-Binding Pharmacophores for Influenza Endonuclease. J Med Chem 2018; 61:10206-10217. [PMID: 30351002 DOI: 10.1021/acs.jmedchem.8b01363] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Metalloenzymes represent an important target space for drug discovery. A limitation to the early development of metalloenzyme inhibitors has been the lack of established structure-activity relationships (SARs) for molecules that bind the metal ion cofactor(s) of a metalloenzyme. Herein, we employed a bioinorganic perspective to develop an SAR for inhibition of the metalloenzyme influenza RNA polymerase PAN endonuclease. The identified trends highlight the importance of the electronics of the metal-binding pharmacophore (MBP), in addition to MBP sterics, for achieving improved inhibition and selectivity. By optimization of the MBPs for PAN endonuclease, a class of highly active and selective fragments was developed that displays IC50 values <50 nM. This SAR led to structurally distinct molecules that also displayed IC50 values of ∼10 nM, illustrating the utility of a metal-centric development campaign in generating highly active and selective metalloenzyme inhibitors.
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Affiliation(s)
- Cy V Credille
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla , California 92093 , United States
| | - Benjamin L Dick
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla , California 92093 , United States
| | - Christine N Morrison
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla , California 92093 , United States
| | - Ryjul W Stokes
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla , California 92093 , United States
| | - Rebecca N Adamek
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla , California 92093 , United States
| | - Nicholas C Wu
- Department of Integrative Structural and Computational Biology , The Scripps Research Institute , La Jolla , California 92037 , United States
| | - Ian A Wilson
- Department of Integrative Structural and Computational Biology , The Scripps Research Institute , La Jolla , California 92037 , United States.,The Skaggs Institute for Chemical Biology , The Scripps Research Institute , La Jolla , California 92037 , United States
| | - Seth M Cohen
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla , California 92093 , United States
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16
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pH Controlled Impedimetric Sensing of Copper(II) Ion Using Oxytocin as Recognition Element. SURFACES 2018. [DOI: 10.3390/surfaces1010008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We report the modulation of the specific metal gation properties of a peptide and demonstrate a highly selective sensor for copper(II) ion. The neuropeptide oxytocin (OT) is reported for its high affinity towards Zn2+ and Cu2+ at physiological pH. The binding of the metal ions to OT is tuned by altering the pH of the medium. OT was self-assembled on glassy carbon electrode using surface chemistry, and electrochemical impedance spectroscopy (EIS) was used to probe the binding of Cu2+. Our results clearly indicate that at pH 10.0, the binding of Cu2+ to OT is increased compared to that at pH 7.0, while the binding to Zn2+ becomes almost negligible. This proves that the selectivity of OT towards each of the ions can be regulated simply by controlling the pH of the medium and hence allows the preparation of a sensing device with selectivity to Cu2+.
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17
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Ferranco A, Sun K, Udaipaul T, Kraatz H. Metal Coordination to Unsymmetric 1,
n′
‐Disubstituted Ferrocene Histidine Peptides. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800455] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Annaleizle Ferranco
- Department of Physical and Environmental Sciences University of Toronto 1265 Military Trail M1C 1A4 Toronto Canada
- Department of Chemistry University of Toronto Scarborough 80 St. George Street M5S 3H6 Toronto Ontario Canada
| | - Keija Sun
- Department of Chemistry University of Toronto Scarborough 80 St. George Street M5S 3H6 Toronto Ontario Canada
| | - Theodore Udaipaul
- Department of Chemistry University of Toronto Scarborough 80 St. George Street M5S 3H6 Toronto Ontario Canada
| | - Heinz‐Bernhard Kraatz
- Department of Physical and Environmental Sciences University of Toronto 1265 Military Trail M1C 1A4 Toronto Canada
- Department of Chemistry University of Toronto Scarborough 80 St. George Street M5S 3H6 Toronto Ontario Canada
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18
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Mesterházy E, Boff B, Lebrun C, Delangle P, Jancsó A. Oligopeptide models of the metal binding loop of the bacterial copper efflux regulator protein CueR as potential Cu(I) chelators. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.06.062] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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19
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Sénèque O, Rousselot-Pailley P, Pujol A, Boturyn D, Crouzy S, Proux O, Manceau A, Lebrun C, Delangle P. Mercury Trithiolate Binding (HgS 3) to a de Novo Designed Cyclic Decapeptide with Three Preoriented Cysteine Side Chains. Inorg Chem 2018; 57:2705-2713. [PMID: 29443519 DOI: 10.1021/acs.inorgchem.7b03103] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mercury(II) is an unphysiological soft ion with high binding affinity for thiolate ligands. Its toxicity lies in the interactions with low molecular weight thiols including glutathione and cysteine-containing proteins that disrupt the thiol balance and alter vital functions. However, mercury can also be detoxified via interactions with Hg(II)-responsive regulatory proteins such as MerR, which coordinates Hg(II) with three cysteine residues in a trigonal planar fashion (HgS3 coordination). The model cyclodecapeptide P3C, c(GCTCSGCSRP) was designed to promote Hg(II) chelation in a HgS3 coordination environment through the parallel orientation of three cysteine side chains. The binding motif is derived from the dicysteine P2C cyclodecapeptide validated previously as a model for d10 metal transporters containing the binding sequence CxxC. The formation of the mononuclear HgP3C complex with a HgS3 coordination is demonstrated using electrospray ionization mass spectrometry, UV absorption, and 199Hg NMR. Hg LIII-edge extended X-ray absorption fine structure (EXAFS) spectroscopy indicates that the Hg(II) coordination environment is T-shaped with two short Hg-S distances at 2.45 Å and one longer distance at 2.60 Å. The solution structure of the HgP3C complex was refined based on 1H-1H NMR constraints and EXAFS results. The cyclic peptide scaffold has a rectangular shape with the three binding cysteine side chains pointing toward Hg(II). The HgP3CH complex has a p Ka of 4.3, indicating that the HgS3 coordination mode is stable over a large range of pH. This low p Ka value suggests that the preorientation of the three cysteine groups is particularly well-achieved for Hg(II) trithiolate coordination in P3C.
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Affiliation(s)
- Olivier Sénèque
- INAC-SyMMES , Univ. Grenoble Alpes, CEA, CNRS , 38000 Grenoble , France.,Univ. Grenoble Alpes, CNRS, CEA, BIG, LCBM (UMR 5249) , 38000 Grenoble , France
| | | | - Anaïs Pujol
- INAC-SyMMES , Univ. Grenoble Alpes, CEA, CNRS , 38000 Grenoble , France
| | - Didier Boturyn
- DCM UMR 5250, Université Grenoble Alpes-CNRS , 38041 Grenoble cedex 9 , France
| | - Serge Crouzy
- Univ. Grenoble Alpes, CNRS, CEA, BIG, LCBM (UMR 5249) , 38000 Grenoble , France
| | - Olivier Proux
- BM30B/FAME beamline , ESRF , 38043 Grenoble cedex 9 , France
| | - Alain Manceau
- ISTerre , Univ. Grenoble Alpes, CNRS , CS 40700 , 38058 Grenoble , France
| | - Colette Lebrun
- INAC-SyMMES , Univ. Grenoble Alpes, CEA, CNRS , 38000 Grenoble , France
| | - Pascale Delangle
- INAC-SyMMES , Univ. Grenoble Alpes, CEA, CNRS , 38000 Grenoble , France
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20
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Mesterházy E, Lebrun C, Crouzy S, Jancsó A, Delangle P. Short oligopeptides with three cysteine residues as models of sulphur-rich Cu(i)- and Hg(ii)-binding sites in proteins. Metallomics 2018; 10:1232-1244. [DOI: 10.1039/c8mt00113h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Peptides mimicking sulphur-rich fragments found in metallothioneins display unexpectedly different behaviours with the two metal ions Hg(ii) and Cu(i).
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Affiliation(s)
- Edit Mesterházy
- INAC/SYMMES/Université Grenoble Alpes
- CEA
- CNRS
- 38000 Grenoble
- France
| | - Colette Lebrun
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- Szeged H-6720
- Hungary
| | - Serge Crouzy
- BIG/LCBM/Université Grenoble Alpes
- CEA
- CNRS
- (UMR 5249)
- 38000 Grenoble
| | - Attila Jancsó
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- Szeged H-6720
- Hungary
| | - Pascale Delangle
- INAC/SYMMES/Université Grenoble Alpes
- CEA
- CNRS
- 38000 Grenoble
- France
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21
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Tadi K, Alshanski I, Mervinetsky E, Marx G, Petrou P, Dimitrios KM, Gilon C, Hurevich M, Yitzchaik S. Oxytocin-Monolayer-Based Impedimetric Biosensor for Zinc and Copper Ions. ACS OMEGA 2017; 2:8770-8778. [PMID: 29302631 PMCID: PMC5748277 DOI: 10.1021/acsomega.7b01404] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 11/23/2017] [Indexed: 06/07/2023]
Abstract
Zinc and copper are essential metal ions for numerous biological processes. Their levels are tightly maintained in all body organs. Impairment of the Zn2+ to Cu2+ ratio in serum was found to correlate with many disease states, including immunological and inflammatory disorders. Oxytocin (OT) is a neuropeptide, and its activity is modulated by zinc and copper ion binding. Harnessing the intrinsic properties of OT is one of the attractive ways to develop valuable metal ion sensors. Here, we report for the first time an OT-based metal ion sensor prepared by immobilizing the neuropeptide onto a glassy carbon electrode. The developed impedimetric biosensor was ultrasensitive to Zn2+ and Cu2+ ions at physiological pH and not to other biologically relevant ions. Interestingly, the electrochemical impedance signal of two hemicircle systems was recorded after the attachment of OT to the surface. These two semicircles suggest two capacitive regions that result from two different domains in the OT monolayer. Moreover, the change in the charge-transfer resistance of either Zn2+ or Cu2+ was not similar in response to binding. This suggests that the metal-dependent conformational changes of OT can be translated to distinct impedimetric data. Selective masking of Zn2+ and Cu2+ was used to allow for the simultaneous determination of zinc to copper ions ratio by the OT sensor. The OT sensor was able to distinguish between healthy control and multiple sclerosis patients diluted sera samples by determining the Zn/Cu ratio similar to the state-of-the-art techniques. The OT sensor presented herein is likely to have numerous applications in biomedical research and pave the way to other types of neuropeptide-derived sensors.
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Affiliation(s)
- Kiran
Kumar Tadi
- Institute
of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Israel Alshanski
- Institute
of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Evgeniy Mervinetsky
- Institute
of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | | | - Panayiota Petrou
- Department
of Neurology, Hadassah-Hebrew University
Hospital, Ein Kerem, Jerusalem 91120, Israel
| | - Karussis M. Dimitrios
- Department
of Neurology, Hadassah-Hebrew University
Hospital, Ein Kerem, Jerusalem 91120, Israel
| | - Chaim Gilon
- Institute
of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Mattan Hurevich
- Institute
of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Shlomo Yitzchaik
- Institute
of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
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22
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23
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Sóvágó I, Várnagy K, Lihi N, Grenács Á. Coordinating properties of peptides containing histidyl residues. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.04.015] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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24
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Szunyogh D, Szokolai H, Thulstrup PW, Larsen FH, Gyurcsik B, Christensen NJ, Stachura M, Hemmingsen L, Jancsó A. Specificity of the Metalloregulator CueR for Monovalent Metal Ions: Possible Functional Role of a Coordinated Thiol? Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508555] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Dániel Szunyogh
- MTA‐SZTE Bioinorganic Chemistry Research Group, Dóm tér 7, 6720 Szeged (Hungary)
| | - Hajnalka Szokolai
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, 6720 Szeged (Hungary)
| | - Peter W. Thulstrup
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark)
| | - Flemming H. Larsen
- Department of Food Science, University of Copenhagen, Rolighedsvej 30, 1958 Frederiksberg C (Denmark)
| | - Béla Gyurcsik
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, 6720 Szeged (Hungary)
| | - Niels Johan Christensen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark)
| | - Monika Stachura
- ISOLDE‐CERN, 1211 Geneva 23 (Switzerland)
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3 (Canada)
| | - Lars Hemmingsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark)
| | - Attila Jancsó
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, 6720 Szeged (Hungary)
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25
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Szunyogh D, Szokolai H, Thulstrup PW, Larsen FH, Gyurcsik B, Christensen NJ, Stachura M, Hemmingsen L, Jancsó A. Specificity of the Metalloregulator CueR for Monovalent Metal Ions: Possible Functional Role of a Coordinated Thiol? Angew Chem Int Ed Engl 2015; 54:15756-61. [PMID: 26563985 DOI: 10.1002/anie.201508555] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Indexed: 11/12/2022]
Abstract
Metal-ion-responsive transcriptional regulators within the MerR family effectively discriminate between mono- and divalent metal ions. Herein we address the origin of the specificity of the CueR protein for monovalent metal ions. Several spectroscopic techniques were employed to study Ag(I) , Zn(II) , and Hg(II) binding to model systems encompassing the metal-ion-binding loop of CueR from E. coli and V. cholerae. In the presence of Ag(I) , a conserved cysteine residue displays a pKa value for deprotonation of the thiol that is close to the physiological pH value. This property is only observed with the monovalent metal ion. Quantum chemically optimized structures of the CueR metal site with Cys 112 protonated demonstrate that the conserved Ser 77 backbone carbonyl oxygen atom from the other monomer of the homodimer is "pulled" towards the metal site. A common allosteric mechanism of the metalloregulatory members of the MerR family is proposed. For CueR, the mechanism relies on the protonation of Cys 112.
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Affiliation(s)
- Dániel Szunyogh
- MTA-SZTE Bioinorganic Chemistry Research Group, Dóm tér 7, 6720 Szeged (Hungary)
| | - Hajnalka Szokolai
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, 6720 Szeged (Hungary)
| | - Peter W Thulstrup
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark)
| | - Flemming H Larsen
- Department of Food Science, University of Copenhagen, Rolighedsvej 30, 1958 Frederiksberg C (Denmark)
| | - Béla Gyurcsik
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, 6720 Szeged (Hungary)
| | - Niels Johan Christensen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark)
| | - Monika Stachura
- ISOLDE-CERN, 1211 Geneva 23 (Switzerland).,TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3 (Canada)
| | - Lars Hemmingsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark).
| | - Attila Jancsó
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, 6720 Szeged (Hungary).
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26
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Lihi N, Grenács Á, Timári S, Turi I, Bányai I, Sóvágó I, Várnagy K. Zinc(ii) and cadmium(ii) complexes of N-terminally free peptides containing two separate cysteinyl binding sites. NEW J CHEM 2015. [DOI: 10.1039/c5nj01677k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The novel synthesized cysteine peptides form stable zinc(ii) and cadmium(ii) complexes; the specific sequence makes possible metal induced amide deprotonation.
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Affiliation(s)
- Norbert Lihi
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Debrecen
- Hungary
| | - Ágnes Grenács
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Debrecen
- Hungary
| | - Sarolta Timári
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Debrecen
- Hungary
| | - Ildikó Turi
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Debrecen
- Hungary
| | - István Bányai
- Department of Colloid and Environmental Chemistry
- University of Debrecen
- Debrecen
- Hungary
| | - Imre Sóvágó
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Debrecen
- Hungary
| | - Katalin Várnagy
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Debrecen
- Hungary
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