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Csire G, Timári S, Asztalos J, Király JM, Kiss M, Várnagy K. Coordination, redox properties and SOD activity of Cu(II) complexes of multihistidine peptides. J Inorg Biochem 2017; 177:198-210. [PMID: 28972934 DOI: 10.1016/j.jinorgbio.2017.08.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Revised: 08/02/2017] [Accepted: 08/30/2017] [Indexed: 01/08/2023]
Abstract
The results of electrochemical and SOD activity measurements of such copper(II) complexes of terminally protected multihistidine peptides that may mimic the active site of CuZnSOD enzyme are submitted and completed with solution equilibrium studies of some copper(II)-ligand systems. The equilibrium data confirm that the thermodynamic stabilities increase with the increasing number of histidyl residues in the amino acid sequence, the stability order, however, can be finely tuned by the number and quality of amino acids between histidine residues. Based on the cyclic voltammetric studies we concluded that the formal reduction potential values of imidazole nitrogen coordinated complexes decrease with the increasing number of imidazole donor atoms in the coordination sphere. However, the redox parameters of [CuH-1L]+ and [CuH-2L] complexes containing amide nitrogen coordination can be determined as well. All formal potential values of [CuL]2+, [CuH-1L]+ and [CuH-2L] complexes fall in the middle potential range of SOD activity. Finally, after the detailed analysis of species distribution curves based upon the equilibrium data SOD activity of copper(II) containing systems at two pH (pH=6.8 and 7.4) were determined. The imidazole coordinated [CuL]2+ complexes of the multihistidine peptide containing the HXH sequence exhibit the most significant activity, but the presence of amide nitrogen coordinated species with slightly distorted geometry could considerably contribute to the SOD activity.
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Affiliation(s)
- Gizella Csire
- Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary
| | - Sarolta Timári
- Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary; Gedeon Richter Plc, PO Box 27, Budapest, 10, H-1475, Hungary(1)
| | - József Asztalos
- Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary
| | - Judit Mária Király
- Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary
| | - Mariann Kiss
- Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary
| | - Katalin Várnagy
- Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary.
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Di Natale G, Turi I, Pappalardo G, Sóvágó I, Rizzarelli E. Cross-Talk Between the Octarepeat Domain and the Fifth Binding Site of Prion Protein Driven by the Interaction of Copper(II) with the N-terminus. Chemistry 2015; 21:4071-84. [DOI: 10.1002/chem.201405502] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Indexed: 12/21/2022]
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3
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Cichon AC, Brown DR. Nrf-2 regulation of prion protein expression is independent of oxidative stress. Mol Cell Neurosci 2014; 63:31-7. [PMID: 25242137 DOI: 10.1016/j.mcn.2014.09.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 08/18/2014] [Accepted: 09/12/2014] [Indexed: 12/13/2022] Open
Abstract
Cellular expression of host prion protein (PrP) is essential to infection with prion disease. Understanding the mechanisms that regulate prion protein expression at both the transcriptional and translational levels is therefore an important goal. The cellular prion protein has been associated with resistance to oxidative, and its expression is also increased by oxidative stress. The transcription factor Nrf-2 is associated with cellular responses to oxidative stress and is known to induce upregulation of antioxidant defense mechanisms. We have identified an Nrf-2 binding site in the prion protein promoter (Prnp) and shown that Nrf-2 downregulated PrP expression. However, this effect is independent of oxidative stress as oxidative stress can up-regulate PrP expression regardless of the level of Nrf-2 expression. Furthermore, Nrf-2 has no impact on PrP expression when cells are infected with scrapie. These findings highlight that Nrf-2 can regulate PrP expression, but that this regulation becomes uncoupled during cellular stress.
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Affiliation(s)
| | - David R Brown
- Department of Biology and Biochemistry, University of Bath, Bath, UK.
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4
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Evolutionary implications of metal binding features in different species' prion protein: an inorganic point of view. Biomolecules 2014; 4:546-65. [PMID: 24970230 PMCID: PMC4101497 DOI: 10.3390/biom4020546] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 04/29/2014] [Accepted: 05/06/2014] [Indexed: 12/21/2022] Open
Abstract
Prion disorders are a group of fatal neurodegenerative conditions of mammals. The key molecular event in the pathogenesis of such diseases is the conformational conversion of prion protein, PrPC, into a misfolded form rich in β-sheet structure, PrPSc, but the detailed mechanistic aspects of prion protein conversion remain enigmatic. There is uncertainty on the precise physiological function of PrPC in healthy individuals. Several evidences support the notion of its role in copper homeostasis. PrPC binds Cu2+ mainly through a domain composed by four to five repeats of eight amino acids. In addition to mammals, PrP homologues have also been identified in birds, reptiles, amphibians and fish. The globular domain of protein is retained in the different species, suggesting that the protein carries out an essential common function. However, the comparison of amino acid sequences indicates that prion protein has evolved differently in each vertebrate class. The primary sequences are strongly conserved in each group, but these exhibit a low similarity with those of mammals. The N-terminal domain of different prions shows tandem amino acid repeats with an increasing amount of histidine residues going from amphibians to mammals. The difference in the sequence affects the number of copper binding sites, the affinity and the coordination environment of metal ions, suggesting that the involvement of prion in metal homeostasis may be a specific characteristic of mammalian prion protein. In this review, we describe the similarities and the differences in the metal binding of different species' prion protein, as revealed by studies carried out on the entire protein and related peptide fragments.
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Zhao C, Wang X, He L, Zhu D, Wang B, Du W. Influence of gold–bipyridyl derivants on aggregation and disaggregation of the prion neuropeptide PrP106–126. Metallomics 2014; 6:2117-25. [DOI: 10.1039/c4mt00219a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gold–bipyridyl derivants affect aggregation and disaggregation of a prion neuropeptide PrP106–126.
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Affiliation(s)
- Cong Zhao
- Department of Chemistry
- Renmin University of China
- Beijing, China
| | - Xuesong Wang
- Department of Chemistry
- Renmin University of China
- Beijing, China
| | - Lei He
- Department of Chemistry
- Renmin University of China
- Beijing, China
| | - Dengsen Zhu
- Department of Chemistry
- Renmin University of China
- Beijing, China
| | - Baohuai Wang
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing, China
| | - Weihong Du
- Department of Chemistry
- Renmin University of China
- Beijing, China
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6
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Wang X, Zhang B, Zhao C, Wang Y, He L, Cui M, Zhu X, Du W. Inhibition of human prion neuropeptide PrP106-126 aggregation by hexacoordinated ruthenium complexes. J Inorg Biochem 2013; 128:1-10. [DOI: 10.1016/j.jinorgbio.2013.07.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 07/05/2013] [Accepted: 07/08/2013] [Indexed: 11/24/2022]
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7
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Csire G, Demjén J, Timári S, Várnagy K. Electrochemical and SOD activity studies of copper(II) complexes of bis(imidazol-2-yl) derivatives. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.05.053] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Zhou F, Millhauser GL. The Rich Electrochemistry and Redox Reactions of the Copper Sites in the Cellular Prion Protein. Coord Chem Rev 2012; 256:2285-2296. [PMID: 23144499 PMCID: PMC3491995 DOI: 10.1016/j.ccr.2012.04.035] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This paper reviews recent electrochemical studies of the copper complexes of prion protein (PrP) and its related peptides, and correlates their redox behavior to chemical and biologically relevant reactions. Particular emphasis is placed on the difference in redox properties between copper in the octarepeat (OR) and the non-OR domains of PrP, as well as differences between the high and low copper occupancy states in the OR domain. Several discrepancies in literature concerning these differences are discussed and reconciled. The PrP copper complexes, in comparison to copper complexes of other amyloidogenic proteins/peptides, display a more diverse and richer redox chemistry. The specific protocols and caveats that need to be considered in studying the electrochemistry and redox reactions of copper complexes of PrP, PrP-derived peptides, and other related amyloidogenic proteins are summarized.
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Affiliation(s)
- Feimeng Zhou
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032
| | - Glenn L. Millhauser
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064
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Arena G, La Mendola D, Pappalardo G, Sóvágó I, Rizzarelli E. Interactions of Cu2+ with prion family peptide fragments: Considerations on affinity, speciation and coordination. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2012.03.038] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Árus D, Jancsó A, Szunyogh D, Matyuska F, Nagy NV, Hoffmann E, Körtvélyesi T, Gajda T. On the possible roles of N-terminal His-rich domains of Cu,Zn SODs of some Gram-negative bacteria. J Inorg Biochem 2012; 106:10-8. [DOI: 10.1016/j.jinorgbio.2011.09.029] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 09/21/2011] [Accepted: 09/21/2011] [Indexed: 12/01/2022]
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11
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Structural characterization of Cu2+, Ni2+ and Zn2+ binding sites of model peptides associated with neurodegenerative diseases. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2011.07.004] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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12
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Davies P, McHugh PC, Hammond VJ, Marken F, Brown DR. Contribution of Individual Histidines to Prion Protein Copper Binding. Biochemistry 2011; 50:10781-91. [DOI: 10.1021/bi2012349] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Paul Davies
- Department of Biology and Biochemistry and ‡Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - Patrick C. McHugh
- Department of Biology and Biochemistry and ‡Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - Victoria J. Hammond
- Department of Biology and Biochemistry and ‡Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - Frank Marken
- Department of Biology and Biochemistry and ‡Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - David R. Brown
- Department of Biology and Biochemistry and ‡Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
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13
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Liu L, Jiang D, McDonald A, Hao Y, Millhauser GL, Zhou F. Copper redox cycling in the prion protein depends critically on binding mode. J Am Chem Soc 2011; 133:12229-37. [PMID: 21707094 PMCID: PMC3166251 DOI: 10.1021/ja2045259] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The prion protein (PrP) takes up 4-6 equiv of copper in its extended N-terminal domain, composed of the octarepeat (OR) segment (human sequence residues 60-91) and two mononuclear binding sites (at His96 and His111; also referred to as the non-OR region). The OR segment responds to specific copper concentrations by transitioning from a multi-His mode at low copper levels to a single-His, amide nitrogen mode at high levels (Chattopadhyay et al. J. Am. Chem. Soc. 2005, 127, 12647-12656). The specific function of PrP in healthy tissue is unclear, but numerous reports link copper uptake to a neuroprotective role that regulates cellular stress (Stevens, et al. PLoS Pathog.2009, 5 (4), e1000390). A current working hypothesis is that the high occupancy binding mode quenches copper's inherent redox cycling, thus, protecting against the production of reactive oxygen species from unregulated Fenton type reactions. Here, we directly test this hypothesis by performing detailed pH-dependent electrochemical measurements on both low and high occupancy copper binding modes. In contrast to the current belief, we find that the low occupancy mode completely quenches redox cycling, but high occupancy leads to the gentle production of hydrogen peroxide through a catalytic reduction of oxygen facilitated by the complex. These electrochemical findings are supported by independent kinetic measurements that probe for ascorbate usage and also peroxide production. Hydrogen peroxide production is also observed from a segment corresponding to the non-OR region. Collectively, these results overturn the current working hypothesis and suggest, instead, that the redox cycling of copper bound to PrP in the high occupancy mode is not quenched, but is regulated. The observed production of hydrogen peroxide suggests a mechanism that could explain PrP's putative role in cellular signaling.
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Affiliation(s)
- Lin Liu
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032
| | - Dianlu Jiang
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032
| | - Alex McDonald
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064
| | - Yuanqiang Hao
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032
| | - Glenn L. Millhauser
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064
| | - Feimeng Zhou
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032
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14
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Wang Y, Feng L, Zhang B, Wang X, Huang C, Li Y, Du W. Palladium Complexes Affect the Aggregation of Human Prion Protein PrP106-126. Inorg Chem 2011; 50:4340-8. [DOI: 10.1021/ic102331x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Yanli Wang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Li Feng
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Bingbing Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Xuesong Wang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Cheng Huang
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Yiming Li
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Weihong Du
- Department of Chemistry, Renmin University of China, Beijing 100872, China
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15
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Wang Y, Xu J, Wang L, Zhang B, Du W. Interaction of the Human Prion Protein PrP106-126 with Metal Complexes: Potential Therapeutic Agents Against Prion Disease. Chemistry 2010; 16:13339-42. [DOI: 10.1002/chem.201002207] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Valensin D, Szyrwiel Ł, Camponeschi F, Rowińska-Zyrek M, Molteni E, Jankowska E, Szymanska A, Gaggelli E, Valensin G, Kozłowski H. Heteronuclear and homonuclear Cu2+ and Zn2+ complexes with multihistidine peptides based on zebrafish prion-like protein. Inorg Chem 2009; 48:7330-40. [PMID: 19586023 DOI: 10.1021/ic9008202] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The homeostasis of metal ions, especially copper and zinc, is a major factor that may influence the prion diseases and the biological function of prion protein (PrP). The His-rich regions are basic sites for metal binding and antioxidant activity of the PrP structures. Animal prion-like proteins contain also His-rich domains, and their coordination chemistry may provide better insight into the chemistry and biology of PrP structures and related diseases. Herein, we report an equilibrium study on heteronuclear Zn(2+)-Cu(2+) complexes with zrel-PrP fragments from zebrafish. Potentiometric, spectroscopic, and mass spectrometric methods showed that the binding of copper is much more effective than the binding of zinc. At physiological pH, both metals bind to the histidine imidazole N donors of the studied peptides.
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Affiliation(s)
- Daniela Valensin
- Department of Chemistry, University of Siena, Via Aldo Moro, 53100 Siena, Italy.
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17
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Copper, iron, and zinc ions homeostasis and their role in neurodegenerative disorders (metal uptake, transport, distribution and regulation). Coord Chem Rev 2009. [DOI: 10.1016/j.ccr.2009.05.011] [Citation(s) in RCA: 342] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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18
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Zoroddu MA, Medici S, Peana M. Copper and nickel binding in multi-histidinic peptide fragments. J Inorg Biochem 2009; 103:1214-20. [DOI: 10.1016/j.jinorgbio.2009.06.008] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2009] [Revised: 06/22/2009] [Accepted: 06/22/2009] [Indexed: 10/20/2022]
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19
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Yamamoto N, Kuwata K. Difference in redox behaviors between copper-binding octarepeat and nonoctarepeat sites in prion protein. J Biol Inorg Chem 2009; 14:1209-18. [DOI: 10.1007/s00775-009-0564-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2009] [Accepted: 06/22/2009] [Indexed: 02/07/2023]
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20
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Davies P, Marken F, Salter S, Brown DR. Thermodynamic and Voltammetric Characterization of the Metal Binding to the Prion Protein: Insights into pH Dependence and Redox Chemistry. Biochemistry 2009; 48:2610-9. [DOI: 10.1021/bi900170n] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paul Davies
- Department of Biology and Biochemistry and Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - Frank Marken
- Department of Biology and Biochemistry and Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - Simon Salter
- Department of Biology and Biochemistry and Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - David R. Brown
- Department of Biology and Biochemistry and Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
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21
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Modeling the interplay of glycine protonation and multiple histidine binding of copper in the prion protein octarepeat subdomains. J Biol Inorg Chem 2008; 14:361-74. [PMID: 19048309 DOI: 10.1007/s00775-008-0454-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2008] [Accepted: 11/14/2008] [Indexed: 11/26/2022]
Abstract
The octarepeat region of the prion protein can bind Cu(2+) ions up to full occupancy (one ion per octarepeat) at neutral pH. While crystallographic data show that the HGGG octarepeat subdomain is the basic binding unit, multiple histidine coordination at lower Cu occupancy has been reported by X-ray absorption spectroscopy, EPR, and potentiometric experiments. In this paper we investigate, with first principles Car-Parrinello simulations, the first step for the formation of the Cu low-level binding mode, where four histidine side chains are coordinated to the same Cu(2+) ion. This step involves the further binding of a second histidine to an already HGGG domain bonded Cu(2+) ion. The influence of the pH on the ability of Cu to bind two histidine side chains was taken into account by simulating different protonation states of the amide N atoms of the two glycines lying nearest to the first histidine. Multiple histidine coordination is also seen to occur when glycine deprotonation occurs and the presence of the extra histidine stabilizes the Cu-peptide complex. Though the stabilization effect slightly decreases with the number of deprotonated glycines (reaching a minimum when both N atoms of the two nearest glycines are available as Cu ligands), the system is still capable of binding the second histidine in a 4N tetrahedral (though slightly distorted) coordination, whose energy is very near to that of the crystallographic square-planar 3N1O coordination. This result suggests that at low metal concentration the reorganization energy associated with Cu(II)/Cu(I) reduction is small also at pH approximately 7, when glycines are deprotonated.
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Jakab IN, Lorincz O, Jancsó A, Gajda T, Gyurcsik B. Approaching the minimal metal ion binding peptide for structural and functional metalloenzyme mimicking. Dalton Trans 2008:6987-95. [PMID: 19050785 DOI: 10.1039/b811452h] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The peptides Ac-His-Pro-His-Pro-His-NH(2) (L1) and Ac-Lys-His-Pro-His-Pro-His-Gln-NH(2) (L2) have been prepared and the equilibria of their proton, copper(II) and zinc(II) complexes in aqueous solution have been studied by the combination of pH-potentiometric titrations, UV/visible and circular dichroism (CD) spectroscopy. The latter methods also provided information on solution structure of the complexes formed under different conditions. Both ligands formed complexes with three imidazole nitrogens around the metal ion at pH ~7. In the L1 containing system precipitation of either copper(II) or zinc(II) complexes occurred upon slight increase of the pH. The re-titration of the filtered and acidified precipitates revealed that the insoluble materials were neutral complexes rather than metal-hydroxides. Indeed, by attaching amino acids with polar side-chains to the His-Pro-His-Pro-His template in L2 we could prevent any precipitation, and the soluble complexes around pH ~7 exerted three imidazole nitrogens and a (deprotonated) water molecule around the metal ions. To our knowledge L2 provides the first example of a short peptide preventing both the amide nitrogen coordination in copper(II) and the formation of copper(II) and zinc(II) hydroxides. The zinc(II) and copper(II) complexes at pH ~7 having similar structure to the natural hydrolytic and redox enzymes, respectively, showed considerable activity in hydrolytic cleavage assays with a model substrate (2-hydroxypropyl-4-nitrophenyl phosphate), as well as with native plasmid DNA, and in a superoxide dismutase-like reaction.
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Affiliation(s)
- Ida Noémi Jakab
- Department of Inorganic and Analytical Chemistry, University of Szeged, Szeged, Hungary
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Gaggelli E, Jankowska E, Kozlowski H, Marcinkowska A, Migliorini C, Stanczak P, Valensin D, Valensin G. Structural Characterization of the Intra- and Inter-Repeat Copper Binding Modes within the N-Terminal Region of “Prion Related Protein” (PrP-rel-2) of Zebrafish. J Phys Chem B 2008; 112:15140-50. [DOI: 10.1021/jp804759q] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elena Gaggelli
- Department of Chemistry, University of Siena, via Aldo Moro, 53-100 Siena, Italy, Faculty of Chemistry, University of Gdañsk, Gdañsk, Poland, and Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Elzbieta Jankowska
- Department of Chemistry, University of Siena, via Aldo Moro, 53-100 Siena, Italy, Faculty of Chemistry, University of Gdañsk, Gdañsk, Poland, and Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Henryk Kozlowski
- Department of Chemistry, University of Siena, via Aldo Moro, 53-100 Siena, Italy, Faculty of Chemistry, University of Gdañsk, Gdañsk, Poland, and Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Alina Marcinkowska
- Department of Chemistry, University of Siena, via Aldo Moro, 53-100 Siena, Italy, Faculty of Chemistry, University of Gdañsk, Gdañsk, Poland, and Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Caterina Migliorini
- Department of Chemistry, University of Siena, via Aldo Moro, 53-100 Siena, Italy, Faculty of Chemistry, University of Gdañsk, Gdañsk, Poland, and Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Pawel Stanczak
- Department of Chemistry, University of Siena, via Aldo Moro, 53-100 Siena, Italy, Faculty of Chemistry, University of Gdañsk, Gdañsk, Poland, and Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Daniela Valensin
- Department of Chemistry, University of Siena, via Aldo Moro, 53-100 Siena, Italy, Faculty of Chemistry, University of Gdañsk, Gdañsk, Poland, and Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Gianni Valensin
- Department of Chemistry, University of Siena, via Aldo Moro, 53-100 Siena, Italy, Faculty of Chemistry, University of Gdañsk, Gdañsk, Poland, and Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
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Copper(II) complexes with an avian prion N-terminal region and their potential SOD-like activity. J Inorg Biochem 2008; 103:195-204. [PMID: 19019452 DOI: 10.1016/j.jinorgbio.2008.10.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Revised: 10/03/2008] [Accepted: 10/06/2008] [Indexed: 11/20/2022]
Abstract
Potentiometric and spectroscopic (UV-Vis, CD and EPR) studies were carried out on copper(II) complexes with chicken prion protein N-terminal fragments, Ac-(PHNPGY)(4)-NH(2), and the mutated residue, Ac-(PHNPGF)(4)-NH(2), to assess the role of tyrosine in the copper coordination. Both thermodynamic and spectroscopic results indicate that chicken prion fragments are not able to bind more than two copper ions and only with the involvement of side chain tyrosine groups. The prevailing complex shows one copper ion bound to four imidazole nitrogen atoms in the 1:1 metal to ligand ratio systems. The superoxide dismutase (SOD)-like activity of copper(II) complexes with the avian peptides and mammal analogue, Ac-(PHGGGWGQ)(4)-NH(2), was also investigated by means of Pulse radiolysis. The copper(II) complexes with avian peptides do not display SOD-like activity, while very low activity has been detected for the copper(II) complexes with mammalian tetraoctarepeat.
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Kozlowski H, Janicka-Klos A, Stanczak P, Valensin D, Valensin G, Kulon K. Specificity in the Cu2+ interactions with prion protein fragments and related His-rich peptides from mammals to fishes. Coord Chem Rev 2008. [DOI: 10.1016/j.ccr.2007.08.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Stańczak P, Juszczyk P, Grzonka Z, Kozłowski H. The whole hexapeptide repeats domain from avian PrP displays untypical hallmarks in aspect of the Cu2+complexes formation. FEBS Lett 2007; 581:4544-8. [PMID: 17803992 DOI: 10.1016/j.febslet.2007.08.043] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2007] [Revised: 08/07/2007] [Accepted: 08/08/2007] [Indexed: 11/19/2022]
Abstract
Prions, the infectious agents responsible for the transmissible spongiform encephalopathies (TSEs) have defied full characterization for decades. Although the interactions of Cu(2+) ions with PrP both in vivo and in vitro are well documented, there are still a lot of ambiguities concerning the biological and chemical nature of these effects. In this work, we have investigated the interactions of Cu(2+) ions with whole repeat region of the copper-binding domain (hexapeptide repeats) of chicken PrP. Our results provide explanations for the structural and chemical basis of the specific interactions of Cu(2+) ions with the hexapeptide repeat region. Furthermore, we show that SOD-like activity depends on Cu(2+) complexes.
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Affiliation(s)
- Paweł Stańczak
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wroclaw, Poland
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