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Strausbaugh Hjelmstad A, Pushie MJ, Ruth K, Escobedo M, Kuter K, Haas KL. Investigating Cu(I) binding to model peptides of N-terminal Aβ isoforms. J Inorg Biochem 2024; 253:112480. [PMID: 38309203 DOI: 10.1016/j.jinorgbio.2024.112480] [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: 10/03/2023] [Revised: 12/10/2023] [Accepted: 01/02/2024] [Indexed: 02/05/2024]
Abstract
Amyloid beta (Aβ) peptides and copper (Cu) ions are each involved in critical biological processes including antimicrobial activity, regulation of synaptic function, angiogenesis, and others. Aβ binds to Cu and may play a role in Cu trafficking. Aβ peptides exist in isoforms that vary at their C-and N-termini; variation at the N-terminal sequence affects Cu binding affinity, structure, and redox activity by providing different sets of coordinating groups to the metal ion. Several N-terminal isoforms have been detected in human brain tissues including Aβ1-40/42, Aβ3-42, pEAβ3-42, Aβ4-42, Aβ11-40 and pEAβ11-40 (where pE denotes an N-terminal pyroglutamic acid). Several previous works have individually investigated the affinity and structure of Cu(I) bound to some of these isoforms' metal binding domains. However, the disparately reported values are apparent constants collected under different sets of conditions, and thus an integrated comparison cannot be made. The work presented here provides the Cu(I) coordination structure and binding affinities of these six biologically relevant Aβ isoforms determined in parallel using model peptides of the Aβ metal binding domains (Aβ1-16, Aβ3-16, pEAβ3-16, Aβ4-16, Aβ11-16 and pEAβ11-16). The binding affinities of Cu(I)-Aβ complexes were measured using solution competition with ferrozine (Fz) and bicinchoninic acid (BCA), two colorimetric Cu(I) indicators in common use. The Cu(I) coordination structures were characterized by X-ray absorption spectroscopy. The data presented here facilitate comparison of the isoforms' Cu-binding interactions and contribute to our understanding of the role of Aβ peptides as copper chelators in healthy and diseased brains.
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Affiliation(s)
| | - M Jake Pushie
- Department of Surgery, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
| | - Kaylee Ruth
- Department of Chemistry, Duke University, Durham, NC 27708, USA
| | - Maria Escobedo
- Department of Mathematics and Computer Science, Saint Mary's College, Notre Dame, Indiana 46556, USA
| | - Kristin Kuter
- Department of Mathematics and Computer Science, Saint Mary's College, Notre Dame, Indiana 46556, USA
| | - Kathryn L Haas
- Department of Chemistry, Duke University, Durham, NC 27708, USA.
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2
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Rulmont C, Stigliani JL, Hureau C, Esmieu C. Rationally Designed Cu(I) Ligand to Prevent CuAβ-Generated ROS Production in the Alzheimer's Disease Context. Inorg Chem 2024; 63:2340-2351. [PMID: 38243896 DOI: 10.1021/acs.inorgchem.3c02693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2024]
Abstract
In the context of Alzheimer's disease, copper (Cu) can be loosely bound to the amyloid-β (Aβ) peptide, leading to the formation of CuAβ, which can catalytically generate reactive oxygen species that contribute to oxidative stress. To fight against this phenomenon, the chelation therapy approach has been developed and consists of using a ligand able to remove Cu from Aβ and to redox-silence it, thus stopping the reactive oxygen species (ROS) production. A large number of Cu(II) chelators has been studied, allowing us to define and refine the properties required to design a "good" ligand, but without strong therapeutic outcomes to date. Those chelators targeted the Cu(II) redox state. Herein, we explore a parallel and relevant alternative pathway by designing a chelator able to target the Cu(I) redox state. To that end, we designed LH2 ([1N3S] binding set) and demonstrated that (i) it is perfectly able to extract Cu(I) from Cu(I)Aβ even in the presence of an excess of Zn(II) and (ii) it redox-silences the Cu, preventing the formation of ROS. We showed that LH2 that is sensitive to oxidation can efficiently replace the [Zn(II)L] complex without losing its excellent ability to stop the ROS production while increasing its resistance to oxidation.
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Affiliation(s)
- Clément Rulmont
- LCC-CNRS, Université de Toulouse, CNRS, Toulouse 31077, France
| | | | | | - Charlène Esmieu
- LCC-CNRS, Université de Toulouse, CNRS, Toulouse 31077, France
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3
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Suh JM, Kim M, Yoo J, Han J, Paulina C, Lim MH. Intercommunication between metal ions and amyloidogenic peptides or proteins in protein misfolding disorders. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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4
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Nath AK, Roy M, Dey C, Dey A, Dey SG. Spin state dependent peroxidase activity of heme bound amyloid β peptides relevant to Alzheimer's disease. Chem Sci 2022; 13:14305-14319. [PMID: 36545147 PMCID: PMC9749105 DOI: 10.1039/d2sc05008k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 11/10/2022] [Indexed: 11/23/2022] Open
Abstract
The colocalization of heme rich deposits in the senile plaque of Aβ in the cerebral cortex of the Alzheimer's disease (AD) brain along with altered heme homeostasis and heme deficiency symptoms in AD patients has invoked the association of heme in AD pathology. Heme bound Aβ complexes, depending on the concentration of the complex or peptide to heme ratio, exhibit an equilibrium between a high-spin mono-His bound peroxidase-type active site and a low-spin bis-His bound cytochrome b type active site. The high-spin heme-Aβ complex shows higher peroxidase activity than free heme, where compound I is the reactive oxidant. It is also capable of oxidizing neurotransmitters like serotonin in the presence of peroxide, owing to the formation of compound I. The low-spin bis-His heme-Aβ complex on the other hand shows enhanced peroxidase activity relative to high-spin heme-Aβ. It reacts with H2O2 to produce two stable intermediates, compound 0 and compound I, which are characterized by absorption, EPR and resonance Raman spectroscopy. The stability of compound I of low-spin heme-Aβ is accountable for its enhanced peroxidase activity and oxidation of the neurotransmitter serotonin. The effect of the second sphere Tyr10 residue of Aβ on the formation and stability of the intermediates of low-spin heme-Aβ has also been investigated. The higher stability of compound I for low-spin heme-Aβ is likely due to H-bonding interactions involving Tyr10 in the distal pocket.
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Affiliation(s)
- Arnab Kumar Nath
- School of Chemical Sciences, Indian Association for the Cultivation of Science2A & 2B, Raja S. C. Mullick Road, JadavpurKolkata 700032India
| | - Madhuparna Roy
- School of Chemical Sciences, Indian Association for the Cultivation of Science2A & 2B, Raja S. C. Mullick Road, JadavpurKolkata 700032India
| | - Chinmay Dey
- School of Chemical Sciences, Indian Association for the Cultivation of Science2A & 2B, Raja S. C. Mullick Road, JadavpurKolkata 700032India
| | - Abhishek Dey
- School of Chemical Sciences, Indian Association for the Cultivation of Science2A & 2B, Raja S. C. Mullick Road, JadavpurKolkata 700032India
| | - Somdatta Ghosh Dey
- School of Chemical Sciences, Indian Association for the Cultivation of Science2A & 2B, Raja S. C. Mullick Road, JadavpurKolkata 700032India
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5
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Sequence-Activity Relationship of ATCUN Peptides in the Context of Alzheimer's Disease. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27227903. [PMID: 36432004 PMCID: PMC9698028 DOI: 10.3390/molecules27227903] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/04/2022] [Accepted: 11/07/2022] [Indexed: 11/17/2022]
Abstract
Amino-terminal CuII and NiII (ATCUN) binding sequences are widespread in the biological world. Here, we report on the study of eight ATCUN peptides aimed at targeting copper ions and stopping the associated formation of reactive oxygen species (ROS). This study was actually more focused on Cu(Aβ)-induced ROS production in which the Aβ peptide is the "villain" linked to Alzheimer's disease. The full characterization of CuII binding to the ATCUN peptides, the CuII extraction from CuII(Aβ), and the ability of the peptides to prevent and/or stop ROS formation are described in the relevant biological conditions. We highlighted in this research that all the ATCUN motifs studied formed the same thermodynamic complex but that the addition of a second histidine in position 1 or 2 allowed for an improvement in the CuII uptake kinetics. This kinetic rate was directly related to the ability of the peptide to stop the CuII(Aβ)-induced production of ROS, with the most efficient motifs being HWHG and HGHW.
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6
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Reznik N, Gallo AD, Rush KW, Javitt G, Fridmann-Sirkis Y, Ilani T, Nairner NA, Fishilevich S, Gokhman D, Chacón KN, Franz KJ, Fass D. Intestinal mucin is a chaperone of multivalent copper. Cell 2022; 185:4206-4215.e11. [PMID: 36206754 DOI: 10.1016/j.cell.2022.09.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 06/21/2022] [Accepted: 09/09/2022] [Indexed: 01/26/2023]
Abstract
Mucus protects the epithelial cells of the digestive and respiratory tracts from pathogens and other hazards. Progress in determining the molecular mechanisms of mucus barrier function has been limited by the lack of high-resolution structural information on mucins, the giant, secreted, gel-forming glycoproteins that are the major constituents of mucus. Here, we report how mucin structures we determined enabled the discovery of an unanticipated protective role of mucus: managing the toxic transition metal copper. Using two juxtaposed copper binding sites, one for Cu2+ and the other for Cu1+, the intestinal mucin, MUC2, prevents copper toxicity by blocking futile redox cycling and the squandering of dietary antioxidants, while nevertheless permitting uptake of this important trace metal into cells. These findings emphasize the value of molecular structure in advancing mucosal biology, while introducing mucins, produced in massive quantities to guard extensive mucosal surfaces, as extracellular copper chaperones.
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Affiliation(s)
- Nava Reznik
- Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Annastassia D Gallo
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Katherine W Rush
- Department of Chemistry, Reed College, Portland, Oregon 97202, United States; Oregon Health & Science University, Portland, Oregon 97239, United States
| | - Gabriel Javitt
- Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Yael Fridmann-Sirkis
- Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Tal Ilani
- Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Noa A Nairner
- Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Simon Fishilevich
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - David Gokhman
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Kelly N Chacón
- Department of Chemistry, Reed College, Portland, Oregon 97202, United States
| | - Katherine J Franz
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Deborah Fass
- Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel.
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7
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Walencik PK. The redox-active Cu-FomA complex: the mode that provides coordination of Cu II/Cu I ions during the reduction/oxidation cycle. Dalton Trans 2022; 51:15515-15529. [PMID: 36165635 DOI: 10.1039/d2dt02398a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Colorectal cancer (CRC) is the third most commonly diagnosed form of cancer worldwide. Recent studies have indicated a strong correlation between microbial imbalance and the development of CRC. An abundance of Fusobacterium nucleatum, an anaerobic Gram-negative bacterium, has been considered a biomarker of CRC progression. Several investigations have also proposed that binding copper ions to various bacterial proteins enhances the CuII + e- ⇄ CuI redox cycle, which consequently promotes uncontrolled production of reactive oxygen species (ROS) and propels colorectal carcinogenesis. In this work, a multidisciplinary approach was applied to study the molecular relation of copper with the peptide models of FomA, a protein expressed by Fusobacterium nucleatum. The main goal was to investigate all the factors that tune the CuII + e- ⇄ CuI equilibrium. A linear peptide Fom1 (Ac-KGHGNGEEGTPTVHNE-NH2) and cyclic peptide Fom2 (cyclo-(KGHGNGEEGTPTVHNE)) were used as ligands. The coordination of CuI was deduced from the NMR data. The conditional dissociation constants KcondD defined the stability of CuI complexes. The electrochemical activity of CuII and CuI compounds was analysed using cyclic voltammetry. A quasi-reversible redox conversion CuII-peptide + e- ⇄ CuI-peptide was revealed for all studied systems. In the presence of ascorbic acid (HAsc), CuII complexes were immediately reduced to CuI species; however, their re-oxidation was kinetically sluggish. The HAsc-induced redox cycle provoked the metal-catalyzed oxidation (MCO) effect. That in the end prevented coordination of the re-appearing CuII ion to its initial binding site. The toxicity of the FomA-CuII/CuI complexes and their role in CRC progression were briefly discussed.
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Affiliation(s)
- Paulina K Walencik
- Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wroclaw, Poland.
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8
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Why the Ala-His-His Peptide Is an Appropriate Scaffold to Remove and Redox Silence Copper Ions from the Alzheimer’s-Related Aβ Peptide. Biomolecules 2022; 12:biom12101327. [PMID: 36291536 PMCID: PMC9599918 DOI: 10.3390/biom12101327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 09/09/2022] [Accepted: 09/13/2022] [Indexed: 11/17/2022] Open
Abstract
The progressive, neurodegenerative Alzheimer’s disease (AD) is the most widespread dementia. Due to the ageing of the population and the current lack of molecules able to prevent or stop the disease, AD will be even more impactful for society in the future. AD is a multifactorial disease, and, among other factors, metal ions have been regarded as potential therapeutic targets. This is the case for the redox-competent Cu ions involved in the production of reactive oxygen species (ROS) when bound to the Alzheimer-related Aβ peptide, a process that contributes to the overall oxidative stress and inflammation observed in AD. Here, we made use of peptide ligands to stop the Cu(Aβ)-induced ROS production and we showed why the AHH sequence is fully appropriate, while the two parents, AH and AAH, are not. The AHH peptide keeps its beneficial ability against Cu(Aβ)-induced ROS, even in the presence of ZnII-competing ions and other biologically relevant ions. The detailed kinetic mechanism by which AHH could exert its action against Cu(Aβ)-induced ROS is also proposed.
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9
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Drommi M, Rulmont C, Esmieu C, Hureau C. Hybrid Bis-Histidine Phenanthroline-Based Ligands to Lessen Aβ-Bound Cu ROS Production: An Illustration of Cu(I) Significance. Molecules 2021; 26:7630. [PMID: 34946712 PMCID: PMC8707446 DOI: 10.3390/molecules26247630] [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: 11/29/2021] [Accepted: 12/10/2021] [Indexed: 11/23/2022] Open
Abstract
We here report the synthesis of three new hybrid ligands built around the phenanthroline scaffold and encompassing two histidine-like moieties: phenHH, phenHGH and H'phenH', where H correspond to histidine and H' to histamine. These ligands were designed to capture Cu(I/II) from the amyloid-β peptide and to prevent the formation of reactive oxygen species produced by amyloid-β bound copper in presence of physiological reductant (e.g., ascorbate) and dioxygen. The amyloid-β peptide is a well-known key player in Alzheimer's disease, a debilitating and devasting neurological disorder the mankind has to fight against. The Cu-Aβ complex does participate in the oxidative stress observed in the disease, due to the redox ability of the Cu(I/II) ions. The complete characterization of the copper complexes made with phenHH, phenHGH and H'phenH' is reported, along with the ability of ligands to remove Cu from Aβ, and to prevent the formation of reactive oxygen species catalyzed by Cu and Cu-Aβ, including in presence of zinc, the second metal ions important in the etiology of Alzheimer's disease. The importance of the reduced state of copper, Cu(I), in the prevention and arrest of ROS is mechanistically described with the help of cyclic voltammetry experiments.
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Affiliation(s)
| | | | | | - Christelle Hureau
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 Route de Narbonne, CEDEX 4, 31077 Toulouse, France; (M.D.); (C.R.); (C.E.)
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10
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Molecular Insights into the Copper-Sensitive Operon Repressor in Acidithiobacillus caldus. Appl Environ Microbiol 2021; 87:e0066021. [PMID: 34085855 DOI: 10.1128/aem.00660-21] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The copper-sensitive operon repressor (CsoR) family, which is the main Cu(I)-sensing family, is widely distributed and regulates regulons involved in detoxification in response to extreme copper stress (a general range of ≥3 g/liter copper ions). Here, we identified CsoR in hyper-copper-resistant Acidithiobacillus caldus (CsoRAc), an organism used in the bioleaching process of copper ores. CsoRAc possesses highly conserved Cu(I) ligands and structures within the CsoR family members. Transcriptional analysis assays indicated that the promoter (PIII) of csoR was active but weakly responsive to copper in Escherichia coli. Copper titration assays gave a stoichiometry of 0.8 mol Cu(I) per apo-CsoRAc monomer in vitro combined with atomic absorption spectroscopy analysis. CuI-CsoRAc and apo-CsoRAc share essentially identical secondary structures and assembly states, as demonstrated by circular dichroism spectra and size exclusion chromatography profiles. The average dissociation constants (KD = 2.26 × 10-18 M and 0.53 × 10-15 M) and Cu(I) binding affinity of apo-CsoRAc were estimated by bathocuproine disulfonate (BCS) and bicinchoninic acid (BCA) competition assays, respectively. Site-directed mutations of conserved Cu(I) ligands in CsoRAc did not significantly alter the secondary structure or assembly state. Competition assays showed that mutants had the same order of magnitude of Cu(I) binding affinity as apo-CsoRAc. Moreover, apo-CsoRAc could bind to the DNA fragment P08430 in vitro, although with low affinity. Finally, a working model was developed to illustrate putative copper resistance mechanisms in A. caldus. IMPORTANCE Research on copper resistance among various species has attracted considerable interest. However, due to the lack of effective and reproducible genetic tools, few studies regarding copper resistance have been reported for A. caldus. Here, we characterized a major Cu(I)-sensing family protein, CsoRAc, which binds Cu(I) with an attomolar affinity higher than that of the Cu(I)-specific chelator bathocuproine disulfonate. In particular, CsoR family proteins were identified only in A. caldus, rather than A. ferrooxidans and A. thiooxidans, which are both used for bioleaching. Meanwhile, A. caldus harbored more copper resistance determinants and a relatively full-scale regulatory system involved in copper homeostasis. These observations suggested that A. caldus may play an essential role in the application of engineered strains with higher copper resistance in the near future.
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Isaac M, Denisov SA, McClenaghan ND, Sénèque O. Bioinspired Luminescent Europium-Based Probe Capable of Discrimination between Ag + and Cu . Inorg Chem 2021; 60:10791-10798. [PMID: 34236828 DOI: 10.1021/acs.inorgchem.1c01486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Due to their similar coordination properties, discrimination of Cu+ and Ag+ by water-soluble luminescent probes is challenging. We have synthesized LCC4Eu, an 18 amino acid cyclic peptide bearing a europium complex, which is able to bind one Cu+ or Ag+ ion by the side chains of two methionines, a histidine and a 3-(1-naphthyl)-l-alanine. In this system, the naphthyl moiety establishes a cation-π interaction with these cations. It also acts as an antenna for the sensitization of Eu3+ luminescence. Interestingly, when excited at 280 nm, LCC4Eu behaves as a turn-on probe for Ag+ (+150% Eu emission) and as a turn-off probe for Cu+ (-50% Eu3+ emission). Shifting the excitation wavelength to 305 nm makes the probe responsive to Ag+ (+380% Eu3+ emission) but not to Cu+ or other physiological cations. Thus, LCC4Eu is uniquely capable of discriminating Ag+ from Cu+. A detailed spectroscopic characterization based on steady-state and time-resolved measurements clearly demonstrates that Eu3+ sensitization relies on electronic energy transfer from the naphthalene triplet state to the Eu3+ excited states and that the cation-π interaction lowers the energy of this triplet state by 700 and 2400 cm-1 for Ag+ and Cu+, respectively. Spectroscopic data point to a modulation of the efficiency of the electronic energy transfer caused by the differential red shift of the naphthalene triplet, deciphering the differential luminescence response of LCC4Eu toward Ag+ and Cu+.
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Affiliation(s)
- Manon Isaac
- Université Grenoble Alpes, CNRS, CEA, IRIG, LCBM (UMR 5249), 38000 Grenoble, France
| | - Sergey A Denisov
- Université Bordeaux, CNRS, ISM (UMR 5255), 33405 Talence, France
| | | | - Olivier Sénèque
- Université Grenoble Alpes, CNRS, CEA, IRIG, LCBM (UMR 5249), 38000 Grenoble, France
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12
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Tripodal scaffolds with three appended imidazole thiones for Cu(I) chelation and protection from Cu-mediated oxidative stress. J Inorg Biochem 2021; 222:111518. [PMID: 34182264 DOI: 10.1016/j.jinorgbio.2021.111518] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 06/02/2021] [Accepted: 06/12/2021] [Indexed: 11/21/2022]
Abstract
Imidazole thiones appear as interesting building blocks for Cu(I) chelation and protection against Cu-mediated oxidative stress. Therefore, a series of tripodal molecules derived from nitrilotriacetic acid appended with three imidazole thiones belonging either to histamine-like or histidine-like moieties were synthesized. These tripods demonstrate intermediate affinity between that previously measured for tripodal analogues bearing three thiol moieties such as cysteine and those grafted with three thioethers, like methionines, consistently with the thione group in the imidazole thione moiety existing as a tautomer between a thiol and a thione. The two non-alkylated tripods derived from thioimidazole, TH and TH* demonstrated three orders of magnitude larger affinity for Cu(I) (logKpH 7.4 = 14.3) than their analogues derived from N,N'-dialkylated thioimidazole TMe and TEt (logKpH 7.4 = 11-11.6). Their efficiency to inhibit Cu-mediated oxidative stress is demonstrated by several assays involving ascorbate consumption or biomolecule damages and correlates with their ability to chelate Cu(I), related to their conditional complexation constants at pH 7.4. The two non-alkylated tripods derived from thioimidazole, TH and TH* are significantly more powerful in reducing Cu-mediated oxidative stress than their analogues derived from N,N'-dialkylated thioimidazole TMe and TEt.
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13
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Principles and practice of determining metal-protein affinities. Biochem J 2021; 478:1085-1116. [PMID: 33710331 PMCID: PMC7959690 DOI: 10.1042/bcj20200838] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/05/2021] [Accepted: 02/11/2021] [Indexed: 01/02/2023]
Abstract
Metal ions play many critical roles in biology, as structural and catalytic cofactors, and as cell regulatory and signalling elements. The metal–protein affinity, expressed conveniently by the metal dissociation constant, KD, describes the thermodynamic strength of a metal–protein interaction and is a key parameter that can be used, for example, to understand how proteins may acquire metals in a cell and to identify dynamic elements (e.g. cofactor binding, changing metal availabilities) which regulate protein metalation in vivo. Here, we outline the fundamental principles and practical considerations that are key to the reliable quantification of metal–protein affinities. We review a selection of spectroscopic probes which can be used to determine protein affinities for essential biological transition metals (including Mn(II), Fe(II), Co(II), Ni(II), Cu(I), Cu(II) and Zn(II)) and, using selected examples, demonstrate how rational probe selection combined with prudent experimental design can be applied to determine accurate KD values.
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14
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Nguyen PH, Ramamoorthy A, Sahoo BR, Zheng J, Faller P, Straub JE, Dominguez L, Shea JE, Dokholyan NV, De Simone A, Ma B, Nussinov R, Najafi S, Ngo ST, Loquet A, Chiricotto M, Ganguly P, McCarty J, Li MS, Hall C, Wang Y, Miller Y, Melchionna S, Habenstein B, Timr S, Chen J, Hnath B, Strodel B, Kayed R, Lesné S, Wei G, Sterpone F, Doig AJ, Derreumaux P. Amyloid Oligomers: A Joint Experimental/Computational Perspective on Alzheimer's Disease, Parkinson's Disease, Type II Diabetes, and Amyotrophic Lateral Sclerosis. Chem Rev 2021; 121:2545-2647. [PMID: 33543942 PMCID: PMC8836097 DOI: 10.1021/acs.chemrev.0c01122] [Citation(s) in RCA: 384] [Impact Index Per Article: 128.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Protein misfolding and aggregation is observed in many amyloidogenic diseases affecting either the central nervous system or a variety of peripheral tissues. Structural and dynamic characterization of all species along the pathways from monomers to fibrils is challenging by experimental and computational means because they involve intrinsically disordered proteins in most diseases. Yet understanding how amyloid species become toxic is the challenge in developing a treatment for these diseases. Here we review what computer, in vitro, in vivo, and pharmacological experiments tell us about the accumulation and deposition of the oligomers of the (Aβ, tau), α-synuclein, IAPP, and superoxide dismutase 1 proteins, which have been the mainstream concept underlying Alzheimer's disease (AD), Parkinson's disease (PD), type II diabetes (T2D), and amyotrophic lateral sclerosis (ALS) research, respectively, for many years.
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Affiliation(s)
- Phuong H Nguyen
- CNRS, UPR9080, Université de Paris, Laboratory of Theoretical Biochemistry, IBPC, Fondation Edmond de Rothschild, PSL Research University, Paris 75005, France
| | - Ayyalusamy Ramamoorthy
- Biophysics and Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Bikash R Sahoo
- Biophysics and Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Jie Zheng
- Department of Chemical & Biomolecular Engineering, The University of Akron, Akron, Ohio 44325, United States
| | - Peter Faller
- Institut de Chimie, UMR 7177, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - John E Straub
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Laura Dominguez
- Facultad de Química, Departamento de Fisicoquímica, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Joan-Emma Shea
- Department of Chemistry and Biochemistry, and Department of Physics, University of California, Santa Barbara, California 93106, United States
| | - Nikolay V Dokholyan
- Department of Pharmacology and Biochemistry & Molecular Biology, Penn State University College of Medicine, Hershey, Pennsylvania 17033, United States
- Department of Chemistry, and Biomedical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Alfonso De Simone
- Department of Life Sciences, Imperial College London, London SW7 2AZ, U.K
- Molecular Biology, University of Naples Federico II, Naples 80138, Italy
| | - Buyong Ma
- Basic Science Program, Leidos Biomedical Research, Inc., Cancer and Inflammation Program, National Cancer Institute, Frederick, Maryland 21702, United States
- School of Pharmacy, Shanghai Jiao Tong University, Shanghai, China
| | - Ruth Nussinov
- Basic Science Program, Leidos Biomedical Research, Inc., Cancer and Inflammation Program, National Cancer Institute, Frederick, Maryland 21702, United States
- Sackler Institute of Molecular Medicine, Department of Human Genetics and Molecular Medicine Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Saeed Najafi
- Department of Chemistry and Biochemistry, and Department of Physics, University of California, Santa Barbara, California 93106, United States
| | - Son Tung Ngo
- Laboratory of Theoretical and Computational Biophysics & Faculty of Applied Sciences, Ton Duc Thang University, 33000 Ho Chi Minh City, Vietnam
| | - Antoine Loquet
- Institute of Chemistry & Biology of Membranes & Nanoobjects, (UMR5248 CBMN), CNRS, Université Bordeaux, Institut Européen de Chimie et Biologie, 33600 Pessac, France
| | - Mara Chiricotto
- Department of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, U.K
| | - Pritam Ganguly
- Department of Chemistry and Biochemistry, and Department of Physics, University of California, Santa Barbara, California 93106, United States
| | - James McCarty
- Chemistry Department, Western Washington University, Bellingham, Washington 98225, United States
| | - Mai Suan Li
- Institute for Computational Science and Technology, SBI Building, Quang Trung Software City, Tan Chanh Hiep Ward, District 12, Ho Chi Minh City 700000, Vietnam
- Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland
| | - Carol Hall
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
| | - Yiming Wang
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
| | - Yifat Miller
- Department of Chemistry and The Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Be'er Sheva 84105, Israel
| | | | - Birgit Habenstein
- Institute of Chemistry & Biology of Membranes & Nanoobjects, (UMR5248 CBMN), CNRS, Université Bordeaux, Institut Européen de Chimie et Biologie, 33600 Pessac, France
| | - Stepan Timr
- CNRS, UPR9080, Université de Paris, Laboratory of Theoretical Biochemistry, IBPC, Fondation Edmond de Rothschild, PSL Research University, Paris 75005, France
| | - Jiaxing Chen
- Department of Pharmacology and Biochemistry & Molecular Biology, Penn State University College of Medicine, Hershey, Pennsylvania 17033, United States
| | - Brianna Hnath
- Department of Pharmacology and Biochemistry & Molecular Biology, Penn State University College of Medicine, Hershey, Pennsylvania 17033, United States
| | - Birgit Strodel
- Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Rakez Kayed
- Mitchell Center for Neurodegenerative Diseases, and Departments of Neurology, Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, Texas 77555, United States
| | - Sylvain Lesné
- Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Guanghong Wei
- Department of Physics, State Key Laboratory of Surface Physics, and Key Laboratory for Computational Physical Science, Multiscale Research Institute of Complex Systems, Fudan University, Shanghai 200438, China
| | - Fabio Sterpone
- CNRS, UPR9080, Université de Paris, Laboratory of Theoretical Biochemistry, IBPC, Fondation Edmond de Rothschild, PSL Research University, Paris 75005, France
| | - Andrew J Doig
- Division of Neuroscience and Experimental Psychology, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PT, U.K
| | - Philippe Derreumaux
- CNRS, UPR9080, Université de Paris, Laboratory of Theoretical Biochemistry, IBPC, Fondation Edmond de Rothschild, PSL Research University, Paris 75005, France
- Laboratory of Theoretical Chemistry, Ton Duc Thang University, 33000 Ho Chi Minh City, Vietnam
- Faculty of Pharmacy, Ton Duc Thang University, 33000 Ho Chi Minh City, Vietnam
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15
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Calculating metalation in cells reveals CobW acquires Co II for vitamin B 12 biosynthesis while related proteins prefer Zn II. Nat Commun 2021; 12:1195. [PMID: 33608553 PMCID: PMC7895991 DOI: 10.1038/s41467-021-21479-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 01/25/2021] [Indexed: 02/01/2023] Open
Abstract
Protein metal-occupancy (metalation) in vivo has been elusive. To address this challenge, the available free energies of metals have recently been determined from the responses of metal sensors. Here, we use these free energy values to develop a metalation-calculator which accounts for inter-metal competition and changing metal-availabilities inside cells. We use the calculator to understand the function and mechanism of GTPase CobW, a predicted CoII-chaperone for vitamin B12. Upon binding nucleotide (GTP) and MgII, CobW assembles a high-affinity site that can obtain CoII or ZnII from the intracellular milieu. In idealised cells with sensors at the mid-points of their responses, competition within the cytosol enables CoII to outcompete ZnII for binding CobW. Thus, CoII is the cognate metal. However, after growth in different [CoII], CoII-occupancy ranges from 10 to 97% which matches CobW-dependent B12 synthesis. The calculator also reveals that related GTPases with comparable ZnII affinities to CobW, preferentially acquire ZnII due to their relatively weaker CoII affinities. The calculator is made available here for use with other proteins.
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16
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Esmieu C, Balderrama-Martínez-Sotomayor R, Conte-Daban A, Iranzo O, Hureau C. Unexpected Trends in Copper Removal from Aβ Peptide: When Less Ligand Is Better and Zn Helps. Inorg Chem 2021; 60:1248-1256. [PMID: 33400522 DOI: 10.1021/acs.inorgchem.0c03407] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cu, Zn, and amyloid-β (Aβ) peptides play an important role in the etiology of Alzheimer's disease (AD). Their interaction indeed modifies the self-assembly propensity of the peptide that is at the origin of the deposition of insoluble peptide aggregates in the amyloid plaque, a hallmark found in AD brains. Another even more important fallout of the Cu binding to Aβ peptide is the formation of reactive oxygen species (ROS) that contributes to the overall oxidative stress detected in the disease and is due to the redox ability of the Cu ions. Many therapeutic approaches are currently developed to aid fighting against AD, one of them targeting the redox-active Cu ions. Along this research line, we report in the present article the use of a phenanthroline-based peptide-like ligand (L), which is able to withdraw Cu from Aβ and redox-silence it in a very stable 4N Cu(II) binding site even in the presence of Zn(II). In addition and in contrast to what is usually observed, the presence of excess of L lessens the searched effect of ROS production prevention, but it is counterbalanced by the co-presence of Zn(II). To explain such unprecedented trends, we proposed a mechanism that involves the redox reaction between Cu(II)L and Cu(I)L2. We thus illustrated (i) how speciation and redox chemistry can weaken the effect of a ligand that would have appeared perfectly suitable if only tested in a 1:1 ratio and on CuAβ and (ii) how Zn overcomes the undesired lessening of ROS arrest due to excess of ligand. In brief, we have shown how working in biologically relevant conditions is important for the understanding of all of the reactions at play and this must be taken into consideration for the further rational design of ligands aiming to become drug candidates.
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Affiliation(s)
- Charlène Esmieu
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, 31077 Toulouse, Cedex 4, France
| | | | - Amandine Conte-Daban
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, 31077 Toulouse, Cedex 4, France
| | - Olga Iranzo
- Aix Marseille University, CNRS, Centrale Marseille, iSm2, Campus Scientifique de St Jérôme, 13397 Marseille, France
| | - Christelle Hureau
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, 31077 Toulouse, Cedex 4, France
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17
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Esmieu C, Ferrand G, Borghesani V, Hureau C. Impact of N-Truncated Aβ Peptides on Cu- and Cu(Aβ)-Generated ROS: Cu I Matters! Chemistry 2020; 27:1777-1786. [PMID: 33058356 DOI: 10.1002/chem.202003949] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 10/07/2020] [Indexed: 12/15/2022]
Abstract
In vitro Cu(Aβ1-x )-induced ROS production has been extensively studied. Conversely, the ability of N-truncated isoforms of Aβ to alter the Cu-induced ROS production has been overlooked, even though they are main constituents of amyloid plaques found in the human brain. N-Truncated peptides at the positions 4 and 11 (Aβ4-x and Aβ11-x ) contain an amino-terminal copper and nickel (ATCUN) binding motif (H2 N-Xxx-Zzz-His) that confer them different coordination sites and higher affinities for CuII compared to the Aβ1-x peptide. It has further been proposed that the role of Aβ4-x peptide is to quench CuII toxicity in the brain. However, the role of CuI coordination has not been investigated to date. In contrast to CuII , CuI coordination is expected to be the same for N-truncated and N-intact peptides. Herein, we report in-depth characterizations and ROS production studies of Cu (CuI and CuII ) complexes of the Aβ4-16 and Aβ11-16 N-truncated peptides. Our findings show that the N-truncated peptides do produce ROS when CuI is present in the medium, albeit to a lesser extent than the unmodified counterpart. In addition, when used as competitor ligands (i.e., in the presence of Aβ1-16 ), the N-truncated peptides are not able to fully preclude Cu(Aβ1-16 )-induced ROS production.
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Affiliation(s)
- Charlène Esmieu
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077, Toulouse Cedex 4, France
| | - Guillaume Ferrand
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077, Toulouse Cedex 4, France.,UPS, INPT, University of Toulouse, 31077, Toulouse Cedex 4, France
| | - Valentina Borghesani
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077, Toulouse Cedex 4, France.,UPS, INPT, University of Toulouse, 31077, Toulouse Cedex 4, France.,current address: School of Chemistry, University of Birmingham, Edgbaston, B15 2TT, UK
| | - Christelle Hureau
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077, Toulouse Cedex 4, France.,UPS, INPT, University of Toulouse, 31077, Toulouse Cedex 4, France
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18
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Hunsaker EW, McAuliffe KJ, Franz KJ. Fluconazole analogues with metal-binding motifs impact metal-dependent processes and demonstrate antifungal activity in Candida albicans. J Biol Inorg Chem 2020; 25:729-745. [PMID: 32542530 PMCID: PMC7415656 DOI: 10.1007/s00775-020-01796-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 05/25/2020] [Indexed: 12/28/2022]
Abstract
Azole antifungals are an important class of antifungal drugs due to their low cost, ability to be administered orally, and broad-spectrum activity. However, their widespread and long-term use have given rise to adaptation mechanisms that render these compounds less effective against common fungal pathogens, including Candida albicans. New antifungals are desperately needed as drug-resistant strains become more prevalent. We recently showed that copper supplementation potentiates the activity of the azole antifungal fluconazole against the opportunistic fungal pathogen C. albicans. Here, we report eight new azole analogues derived from fluconazole in which one triazole group has been replaced with a metal-binding group, a strategy designed to enhance potentiation of azole antifungal activity by copper. The bioactivity of all eight compounds was tested and compared to that of fluconazole. Three of the analogues showed activity against C. albicans and two had lower levels of trailing growth. One compound, Flu-TSCZ, was found to impact the levels, speciation, and bioavailability of cellular metals.
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Affiliation(s)
- Elizabeth W Hunsaker
- Department of Chemistry, French Family Science Center, Duke University, 124 Science Drive, Durham, NC, 27708, USA
| | - Katherine J McAuliffe
- Department of Chemistry, French Family Science Center, Duke University, 124 Science Drive, Durham, NC, 27708, USA
| | - Katherine J Franz
- Department of Chemistry, French Family Science Center, Duke University, 124 Science Drive, Durham, NC, 27708, USA.
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19
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Santoro A, Calvo JS, Peris-Díaz MD, Krężel A, Meloni G, Faller P. The Glutathione/Metallothionein System Challenges the Design of Efficient O 2 -Activating Copper Complexes. Angew Chem Int Ed Engl 2020; 59:7830-7835. [PMID: 32049413 PMCID: PMC7294961 DOI: 10.1002/anie.201916316] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Indexed: 01/17/2023]
Abstract
Copper complexes are of medicinal and biological interest, including as anticancer drugs designed to cleave intracellular biomolecules by O2 activation. To exhibit such activity, the copper complex must be redox active and resistant to dissociation. Metallothioneins (MTs) and glutathione (GSH) are abundant in the cytosol and nucleus. Because they are thiol-rich reducing molecules with high CuI affinity, they are potential competitors for a copper ion bound in a copper drug. Herein, we report the investigation of a panel of CuI /CuII complexes often used as drugs, with diverse coordination chemistries and redox potentials. We evaluated their catalytic activity in ascorbate oxidation based on redox cycling between CuI and CuII , as well as their resistance to dissociation or inactivation under cytosolically relevant concentrations of GSH and MT. O2 -activating CuI /CuII complexes for cytosolic/nuclear targets are generally not stable against the GSH/MT system, which creates a challenge for their future design.
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Affiliation(s)
- Alice Santoro
- Institut de Chimie, UMR 7177, University of Strasbourg/ CNRS, 4 rue Blaise Pascal, 67000, Strasbourg, France
| | - Jenifer S Calvo
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 W Campbell Rd., Richardson, TX, 75080, USA
| | - Manuel David Peris-Díaz
- Department of Chemical Biology, Faculty of Biotechnology, University of Wrocław, F. Joliot-Curie 14a, 50-383, Wrocław, Poland
| | - Artur Krężel
- Department of Chemical Biology, Faculty of Biotechnology, University of Wrocław, F. Joliot-Curie 14a, 50-383, Wrocław, Poland
| | - Gabriele Meloni
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 W Campbell Rd., Richardson, TX, 75080, USA
| | - Peter Faller
- Institut de Chimie, UMR 7177, University of Strasbourg/ CNRS, 4 rue Blaise Pascal, 67000, Strasbourg, France
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20
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Santoro A, Calvo JS, Peris‐Díaz MD, Krężel A, Meloni G, Faller P. The Glutathione/Metallothionein System Challenges the Design of Efficient O
2
‐Activating Copper Complexes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201916316] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Alice Santoro
- Institut de Chimie UMR 7177 University of Strasbourg/ CNRS 4 rue Blaise Pascal 67000 Strasbourg France
| | - Jenifer S. Calvo
- Department of Chemistry and Biochemistry The University of Texas at Dallas 800 W Campbell Rd. Richardson TX 75080 USA
| | - Manuel David Peris‐Díaz
- Department of Chemical Biology, Faculty of Biotechnology University of Wrocław F. Joliot-Curie 14a 50–383 Wrocław Poland
| | - Artur Krężel
- Department of Chemical Biology, Faculty of Biotechnology University of Wrocław F. Joliot-Curie 14a 50–383 Wrocław Poland
| | - Gabriele Meloni
- Department of Chemistry and Biochemistry The University of Texas at Dallas 800 W Campbell Rd. Richardson TX 75080 USA
| | - Peter Faller
- Institut de Chimie UMR 7177 University of Strasbourg/ CNRS 4 rue Blaise Pascal 67000 Strasbourg France
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21
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Porchia M, Tisato F, Zancato M, Gandin V, Marzano C. In vitro antitumor activity of water-soluble copper(I) complexes with diimine and monodentate phosphine ligands. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2017.09.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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22
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Subedi P, Paxman JJ, Wang G, Ukuwela AA, Xiao Z, Heras B. The Scs disulfide reductase system cooperates with the metallochaperone CueP in Salmonella copper resistance. J Biol Chem 2019; 294:15876-15888. [PMID: 31444272 DOI: 10.1074/jbc.ra119.010164] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 08/21/2019] [Indexed: 12/31/2022] Open
Abstract
The human pathogen Salmonella enterica serovar Typhimurium (S Typhimurium) contains a complex disulfide bond (Dsb) catalytic machinery. This machinery encompasses multiple Dsb thiol-disulfide oxidoreductases that mediate oxidative protein folding and a less-characterized suppressor of copper sensitivity (scs) gene cluster, associated with increased tolerance to copper. To better understand the function of the Salmonella Scs system, here we characterized two of its key components, the membrane protein ScsB and the periplasmic protein ScsC. Our results revealed that these two proteins form a redox pair in which the electron transfer from the periplasmic domain of ScsB (n-ScsB) to ScsC is thermodynamically driven. We also demonstrate that the Scs reducing pathway remains separate from the Dsb oxidizing pathways and thereby avoids futile redox cycles. Additionally, we provide new insight into the molecular mechanism underlying Scs-mediated copper tolerance in Salmonella We show that both ScsB and ScsC can bind toxic copper(I) with femtomolar affinities and transfer it to the periplasmic copper metallochaperone CueP. Our results indicate that the Salmonella Scs machinery has evolved a dual mode of action, capable of transferring reducing power to the oxidizing periplasm and protecting against copper stress by cooperating with the cue regulon, a major copper resistance mechanism in Salmonella. Overall, these findings expand our understanding of the functional diversity of Dsb-like systems, ranging from those mediating oxidative folding of proteins required for infection to those contributing to defense mechanisms against oxidative stress and copper toxicity, critical traits for niche adaptation and survival.
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Affiliation(s)
- Pramod Subedi
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Kingsbury Drive, Bundoora, Victoria 3083, Australia
| | - Jason J Paxman
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Kingsbury Drive, Bundoora, Victoria 3083, Australia
| | - Geqing Wang
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Kingsbury Drive, Bundoora, Victoria 3083, Australia
| | - Ashwinie A Ukuwela
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Zhiguang Xiao
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.,Melbourne Dementia Research Centre, Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria 3052, Australia
| | - Begoña Heras
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Kingsbury Drive, Bundoora, Victoria 3083, Australia
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23
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Hunsaker EW, Franz KJ. Copper potentiates azole antifungal activity in a way that does not involve complex formation. Dalton Trans 2019; 48:9654-9662. [PMID: 30888372 PMCID: PMC6613581 DOI: 10.1039/c9dt00642g] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
To survive, fungal pathogens must acquire nutrient metals that are restricted by the host while also tolerating mechanisms of metal toxicity that are induced by the host. Given this dual vulnerability, we hypothesized that a pathogen's access to and control of essential yet potentially dangerous metal ions would affect fungal tolerance to antifungal drug stress. Here, we show that Candida albicans becomes sensitized to both Cu limitation and Cu elevation during exposure in liquid culture to the antifungal drug fluconazole, a widely prescribed antifungal agent. Spectroscopic data confirm that while fluconazole forms a complex with Cu(ii) in water, interactions of fluconazole with neither Cu(ii) nor Cu(i) are observed in the cell culture media used for the cellular assays. This result is further supported by growth assays in deletion strains that lack Cu import machinery. Overall, we establish that increases in Cu levels by as little as 40 nM over basal levels in the growth medium reduce tolerance of C. albicans to fluconazole in a way that does not require formation of a Cu-fluconazole complex. Rather, our data point to a more complex relationship between drug stress and Cu availability that gives rise to metal-mediated outcomes of drug treatment.
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Affiliation(s)
- Elizabeth W Hunsaker
- Department of Chemistry, Duke University, French Family Science Center, 124 Science Drive, 27708, Durham, NC, USA.
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24
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Rosario-Cruz Z, Eletsky A, Daigham NS, Al-Tameemi H, Swapna GVT, Kahn PC, Szyperski T, Montelione GT, Boyd JM. The copBL operon protects Staphylococcus aureus from copper toxicity: CopL is an extracellular membrane-associated copper-binding protein. J Biol Chem 2019; 294:4027-4044. [PMID: 30655293 PMCID: PMC6422080 DOI: 10.1074/jbc.ra118.004723] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 01/08/2019] [Indexed: 12/22/2022] Open
Abstract
As complications associated with antibiotic resistance have intensified, copper (Cu) is attracting attention as an antimicrobial agent. Recent studies have shown that copper surfaces decrease microbial burden, and host macrophages use Cu to increase bacterial killing. Not surprisingly, microbes have evolved mechanisms to tightly control intracellular Cu pools and protect against Cu toxicity. Here, we identified two genes (copB and copL) encoded within the Staphylococcus aureus arginine-catabolic mobile element (ACME) that we hypothesized function in Cu homeostasis. Supporting this hypothesis, mutational inactivation of copB or copL increased copper sensitivity. We found that copBL are co-transcribed and that their transcription is increased during copper stress and in a strain in which csoR, encoding a Cu-responsive transcriptional repressor, was mutated. Moreover, copB displayed genetic synergy with copA, suggesting that CopB functions in Cu export. We further observed that CopL functions independently of CopB or CopA in Cu toxicity protection and that CopL from the S. aureus clone USA300 is a membrane-bound and surface-exposed lipoprotein that binds up to four Cu+ ions. Solution NMR structures of the homologous Bacillus subtilis CopL, together with phylogenetic analysis and chemical-shift perturbation experiments, identified conserved residues potentially involved in Cu+ coordination. The solution NMR structure also revealed a novel Cu-binding architecture. Of note, a CopL variant with defective Cu+ binding did not protect against Cu toxicity in vivo Taken together, these findings indicate that the ACME-encoded CopB and CopL proteins are additional factors utilized by the highly successful S. aureus USA300 clone to suppress copper toxicity.
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Affiliation(s)
- Zuelay Rosario-Cruz
- From the Department of Biochemistry and Microbiology, Rutgers, the State University of New Jersey, New Brunswick, New Jersey 08901
| | - Alexander Eletsky
- the Department of Chemistry, State University of New York at Buffalo and Northeast Structural Genomics Consortium, Buffalo, New York 14260, and
| | - Nourhan S Daigham
- the Department of Molecular Biology and Biochemistry, Center for Advanced Biotechnology and Medicine, and Northeast Structural Genomics Consortium, Rutgers, the State University of New Jersey, Piscataway, New Jersey 08854
| | - Hassan Al-Tameemi
- From the Department of Biochemistry and Microbiology, Rutgers, the State University of New Jersey, New Brunswick, New Jersey 08901
| | - G V T Swapna
- the Department of Molecular Biology and Biochemistry, Center for Advanced Biotechnology and Medicine, and Northeast Structural Genomics Consortium, Rutgers, the State University of New Jersey, Piscataway, New Jersey 08854
| | - Peter C Kahn
- From the Department of Biochemistry and Microbiology, Rutgers, the State University of New Jersey, New Brunswick, New Jersey 08901
| | - Thomas Szyperski
- the Department of Chemistry, State University of New York at Buffalo and Northeast Structural Genomics Consortium, Buffalo, New York 14260, and
| | - Gaetano T Montelione
- the Department of Molecular Biology and Biochemistry, Center for Advanced Biotechnology and Medicine, and Northeast Structural Genomics Consortium, Rutgers, the State University of New Jersey, Piscataway, New Jersey 08854,
- the Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School, Rutgers, the State University of New Jersey, Piscataway, New Jersey 08854
| | - Jeffrey M Boyd
- From the Department of Biochemistry and Microbiology, Rutgers, the State University of New Jersey, New Brunswick, New Jersey 08901,
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25
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Young TR, Wedd AG, Xiao Z. Evaluation of Cu(i) binding to the E2 domain of the amyloid precursor protein - a lesson in quantification of metal binding to proteins via ligand competition. Metallomics 2019; 10:108-119. [PMID: 29215101 DOI: 10.1039/c7mt00291b] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The extracellular domain E2 of the amyloid precursor protein (APP) features a His-rich metal-binding site (denoted as the M1 site). In conjunction with surrounding basic residues, the site participates in interactions with components of the extracellular matrix including heparins, a class of negatively charged polysaccharide molecules of varying length. This work studied the chemistry of Cu(i) binding to APP E2 with the probe ligands Bcs, Bca, Fz and Fs. APP E2 forms a stable Cu(i)-mediated ternary complex with each of these anionic ligands. The complex with Bca was selected for isolation and characterization and was demonstrated, by native ESI-MS analysis, to have the stoichiometry E2 : Cu(i) : Bca = 1 : 1 : 1. Formation of these ternary complexes is specific for the APP E2 domain and requires Cu(i) coordination to the M1 site. Mutation of the M1 site was consistent with the His ligands being part of the E2 ligand set. It is likely that interactions between the negatively charged probe ligands and a positively charged patch on the surface of APP E2 are one aspect of the generation of the stable ternary complexes. Their formation prevented meaningful quantification of the affinity of Cu(i) binding to the M1 site with these probe ligands. However, the ternary complexes are disrupted by heparin, allowing reliable determination of a picomolar Cu(i) affinity for the E2/heparin complex with the Fz or Bca probe ligands. This is the first documented example of the formation of stable ternary complexes between a Cu(i) binding protein and a probe ligand. The ready disruption of the complexes by heparin identified clear 'tell-tale' signs for diagnosis of ternary complex formation and allowed a systematic review of conditions and criteria for reliable determination of affinities for metal binding via ligand competition. This study also provides new insights into a potential correlation of APP functions regulated by copper binding and heparin interaction.
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Affiliation(s)
- Tessa R Young
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia
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26
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Young TR, Pukala TL, Cappai R, Wedd AG, Xiao Z. The Human Amyloid Precursor Protein Binds Copper Ions Dominated by a Picomolar-Affinity Site in the Helix-Rich E2 Domain. Biochemistry 2018; 57:4165-4176. [DOI: 10.1021/acs.biochem.8b00572] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Tessa R. Young
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Tara L. Pukala
- Discipline of Chemistry, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Roberto Cappai
- Department of Pharmacology and Therapeutics, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Anthony G. Wedd
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Zhiguang Xiao
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia
- Melbourne Dementia Research Centre, Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria 3052, Australia
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27
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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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28
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Conte-Daban A, Boff B, Candido Matias A, Aparicio CNM, Gateau C, Lebrun C, Cerchiaro G, Kieffer I, Sayen S, Guillon E, Delangle P, Hureau C. A Trishistidine Pseudopeptide with Ability to Remove Both Cu Ι and Cu ΙΙ from the Amyloid-β Peptide and to Stop the Associated ROS Formation. Chemistry 2017; 23:17078-17088. [PMID: 28846165 PMCID: PMC5714062 DOI: 10.1002/chem.201703429] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Indexed: 01/08/2023]
Abstract
The pseudopeptide L, derived from a nitrilotriacetic acid scaffold and functionalized with three histidine moieties, is reminiscent of the amino acid side chains encountered in the Alzheimer's peptide (Aβ). Its synthesis and coordination properties for CuΙ and CuΙΙ are described. L efficiently complex CuΙΙ in a square-planar geometry involving three imidazole nitrogen atoms and an amidate-Cu bond. By contrast, CuΙ is coordinated in a tetrahedral environment. The redox behavior is irreversible and follows an ECEC mechanism in accordance with the very different environments of the two redox states of the Cu center. This is in line with the observed resistance of the CuΙ complex to oxidation by oxygen and the CuΙΙ complex reduction by ascorbate. The affinities of L for CuΙΙ and CuΙ at physiological pH are larger than that reported for the Aβ peptide. Therefore, due to its peculiar Cu coordination properties, the ligand L is able to target both redox states of Cu, redox silence them and prevent reactive oxygen species production by the CuAβ complex. Because reactive oxygen species contribute to the oxidative stress, a key issue in Alzheimer's disease, this ligand thus represents a new strategy in the long route of finding molecular concepts for fighting Alzheimer's disease.
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Affiliation(s)
- A. Conte-Daban
- CNRS, LCC (Laboratoire de Chimie de Coordination) 205 route de Narbonne,BP 44099 31077 Toulouse Cedex 4, France
- University of Toulouse, UPS, INPT 31077 Toulouse Cedex 4, France
| | - B. Boff
- Univ. Grenoble Alpes, CEA, CNRS, INAC, SyMMES (UMR 5819), CIBEST, 17 rue des martyrs, F-38 000 Grenoble, France
| | - A. Candido Matias
- Univ. Grenoble Alpes, CEA, CNRS, INAC, SyMMES (UMR 5819), CIBEST, 17 rue des martyrs, F-38 000 Grenoble, France
- Center for Natural Sciences and Humanities, Federal University of ABC – UFABC 09210-580, Santo André, SP, Brazil
| | - C. N. Montes Aparicio
- CNRS, LCC (Laboratoire de Chimie de Coordination) 205 route de Narbonne,BP 44099 31077 Toulouse Cedex 4, France
- University of Toulouse, UPS, INPT 31077 Toulouse Cedex 4, France
| | - C. Gateau
- Univ. Grenoble Alpes, CEA, CNRS, INAC, SyMMES (UMR 5819), CIBEST, 17 rue des martyrs, F-38 000 Grenoble, France
| | - C. Lebrun
- Univ. Grenoble Alpes, CEA, CNRS, INAC, SyMMES (UMR 5819), CIBEST, 17 rue des martyrs, F-38 000 Grenoble, France
| | - G. Cerchiaro
- Center for Natural Sciences and Humanities, Federal University of ABC – UFABC 09210-580, Santo André, SP, Brazil
| | - I. Kieffer
- BM30B/FAME beamline, ESRF, F-38043 Grenoble cedex 9, France
- Observatoire des Sciences de l’Univers de Grenoble, UMS 832 CNRS Université Grenoble Alpes, F-38041 Grenoble, France
| | - S. Sayen
- Institut de Chimie Moléculaire de Reims (ICMR, UMR CNRS 7312), Université de Reims Champagne-Ardenne, F-51687 Reims Cedex 2, France
| | - E. Guillon
- Institut de Chimie Moléculaire de Reims (ICMR, UMR CNRS 7312), Université de Reims Champagne-Ardenne, F-51687 Reims Cedex 2, France
| | - P. Delangle
- Univ. Grenoble Alpes, CEA, CNRS, INAC, SyMMES (UMR 5819), CIBEST, 17 rue des martyrs, F-38 000 Grenoble, France
| | - C. Hureau
- CNRS, LCC (Laboratoire de Chimie de Coordination) 205 route de Narbonne,BP 44099 31077 Toulouse Cedex 4, France
- University of Toulouse, UPS, INPT 31077 Toulouse Cedex 4, France
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29
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Yako N, Young TR, Cottam Jones JM, Hutton CA, Wedd AG, Xiao Z. Copper binding and redox chemistry of the Aβ16 peptide and its variants: insights into determinants of copper-dependent reactivity. Metallomics 2017; 9:278-291. [PMID: 28145544 DOI: 10.1039/c6mt00299d] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The metal-binding sites of Aβ peptides are dictated primarily by the coordination preferences of the metal ion. Consequently, Cu(i) is typically bound with two His ligands in a linear mode while Cu(ii) forms a pseudo-square planar stereochemistry with the N-terminal amine nitrogen acting as an anchoring ligand. Several distinct combinations of other groups can act as co-ligands for Cu(ii). A population of multiple binding modes is possible with the equilibrium position shifting sensitively with solution pH and the nature of the residues in the N-terminal region. This work examined the Cu(ii) chemistry of the Aβ16 peptide and several variants that targeted these binding modes. The results are consistent with: (i) at pH < 7.8, the square planar site in CuII-Aβ16 consists primarily of a bidentate ligand provided by the carboxylate sidechain of Asp1 and the N-terminal amine supported by the imidazole sidechains of two His residues (designated here as component IA); it is in equilibrium with a less stable component IB in which the carboxylate ligand is substituted by the Asp1-Ala2 carbonyl oxygen. (ii) Both IA and IB convert to a common component II (apparent transition pKa ∼7.8 for IA and ∼6.5 for IB, respectively) featuring a tridentate ligand consisting of the N-terminal amine, the Asp1-Ala2 amide and the Ala2-Pro3 carbonyl; this stereochemistry is stabilized by two five-membered chelate rings. (iii) Component IA is stabilized for variant Aβ16-D1H, components I (both IA and IB) are imposed on Aβ16-A2P while the less stable IB is enforced on Aβ16-D1A (which is converted to component II at pH ∼6.5); (iv) components IA and IB share two His ligands with Cu(i) and are more reactive in redox catalysis than component II that features a highly covalent and less reactive amide N- ligand. The redox activity of IA is further enhanced for peptides with a His1 N-terminus that may act as a ligand for either Cu(i) or Cu(ii) with lower re-organization energy required for redox-shuttling. This study provided insights into the determinants that regulate the reactivity of Cu-Aβ complexes.
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Affiliation(s)
- Nineveh Yako
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Tessa R Young
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Jade M Cottam Jones
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Craig A Hutton
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Anthony G Wedd
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Zhiguang Xiao
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia.
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30
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Helsel ME, White EJ, Razvi SZA, Alies B, Franz KJ. Chemical and functional properties of metal chelators that mobilize copper to elicit fungal killing of Cryptococcus neoformans. Metallomics 2017; 9:69-81. [PMID: 27853789 DOI: 10.1039/c6mt00172f] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A panel of iron (Fe) and copper (Cu) chelators was screened for growth inhibitory activity against the fungal pathogen Cryptococcus neoformans. Select bidentate metal-binding ligands containing mixed O,S or O,N donor atoms were identified as agents that induce cell killing in a Cu-dependent manner. Conversely, structurally similar ligands with O,O donor atoms did not inhibit C. neoformans growth regardless of Cu status. Studies of Cu(ii) and Cu(i) binding affinity, lipophilicity, and growth recovery assays of Cu-import deficient cells identified lipophilicity of thermodynamically stable CuIIL2 complexes as the best predictor of antifungal activity. These same complexes induce cellular hyperaccumulation of Zn and Fe in addition to Cu. The results described here present the utility of appropriate metal-binding ligands as potential antifungal agents that manipulate cellular metal balance as an antimicrobial strategy.
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Affiliation(s)
- Marian E Helsel
- Department of Chemistry, Duke University, French Family Science Center, 124 Science Drive, 22708, Durham, NC, USA.
| | - Elizabeth J White
- Department of Chemistry, Duke University, French Family Science Center, 124 Science Drive, 22708, Durham, NC, USA.
| | - Sayyeda Zeenat A Razvi
- Department of Chemistry, Duke University, French Family Science Center, 124 Science Drive, 22708, Durham, NC, USA.
| | - Bruno Alies
- Department of Chemistry, Duke University, French Family Science Center, 124 Science Drive, 22708, Durham, NC, USA.
| | - Katherine J Franz
- Department of Chemistry, Duke University, French Family Science Center, 124 Science Drive, 22708, Durham, NC, USA.
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31
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Christopher Leslee DB, Karuppannan S, Vengaian KM, Gandhi S, Subramanian S. Carbazole–azine based fluorescence ‘
off–on
’ sensor for selective detection of Cu
2+
and its live cell imaging. LUMINESCENCE 2017. [DOI: 10.1002/bio.3332] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
| | - Sekar Karuppannan
- Department of Chemistry Anna University – University College of Engineering Dindigul India
| | | | - Sivaraman Gandhi
- Institute for Stem Cell Biology and Regenerative Medicine Bangalore India
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32
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Zhu Z, Chen H, Li S, Yang X, Bittner E, Cai C. Tripodal Amine Ligands for Accelerating Cu-Catalyzed Azide-Alkyne Cycloaddition: Efficiency and Stability against Oxidation and Dissociation. Catal Sci Technol 2017; 7:2474-2485. [PMID: 29129990 PMCID: PMC5679428 DOI: 10.1039/c7cy00587c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ancillary ligands, especially the tripodal ligands such as tris(triazolylmethyl)amines, have been widely used to accelerate the Cu-catalyzed azide-alkyne cycloaddition (CuAAC, a "click" reaction). However, the relationship between the activity of these Cu(I) complexes and their stability against air oxidation and ligand dissociation/exchange was seldom studied, which is critical for the applications of CuAAC in many biological systems. In this work, we synthesized twenty-one Cu(I) tripodal ligands varying in chelate arm length (five to seven atoms), donor groups (triazolyl, pyridyl and phenyl), and steric hindrance. The effects of these variables on the CuAAC reaction, air oxidation, and ligand dissociation were evaluated. Reducing the chelate arm length to five atoms, decreasing steric hindrance, or using a relatively weakly-binding ligand can significantly increase the CuAAC reactivity of the Cu(I) complexes, but the concomitant higher degree of oxidation cannot be avoided, which leads to rapid degradation of a histidine-containing peptide as a model of proteins. The oxidation of the peptide can be reduced by attaching oligo(ethylene glycol) chains to the ligands as sacrificing reagents. Using electrospray ionization mass spectrometry (ESI-MS), we directly observed the tri- and di-copper(I)-acetylide complexes in CuAAC reaction in the [5,5,5] ligand system and a small amount of di-Cu(I)-acetylide in the [5,5,6] ligand system. Only the mono-Cu(I) ligand adducts were observed in the [6,6,6] and [5,6,6] ligand systems.
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Affiliation(s)
- Zhiling Zhu
- Department of Chemistry, University of Houston, 4800 Calhoun Rd., Houston, TX 77204, USA
| | - Haoqing Chen
- Department of Chemistry, University of Houston, 4800 Calhoun Rd., Houston, TX 77204, USA
| | - Siheng Li
- Department of Chemistry, University of Houston, 4800 Calhoun Rd., Houston, TX 77204, USA
| | - Xunmo Yang
- Department of Chemistry, University of Houston, 4800 Calhoun Rd., Houston, TX 77204, USA
| | - Eric Bittner
- Department of Chemistry, University of Houston, 4800 Calhoun Rd., Houston, TX 77204, USA
| | - Chengzhi Cai
- Department of Chemistry, University of Houston, 4800 Calhoun Rd., Houston, TX 77204, USA
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33
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Cortes L, Roberts BR, Wedd AG, Xiao Z. Molecular Aspects of a Robust Assay for Ferroxidase Function of Ceruloplasmin. Inorg Chem 2017; 56:5275-5284. [PMID: 28414228 DOI: 10.1021/acs.inorgchem.7b00372] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ceruloplasmin (Cp) is one of the most complex multicopper oxidase enzymes and plays an essential role in the metabolism of iron in mammals. Ferrous ion supplied by the ferroportin exporter is converted by Cp to ferric ion that is accepted by plasma metallo-chaperone transferrin. Study of the enzyme at the atomic and molecular level has been hampered by the lack of a suitable ferrous substrate. We have developed the classic chromophoric complex FeIIHx(Tar)2 (H2Tar, 4-(2-thiazolylazo)resorcinol; x = 0-2; overall charge omitted) as a robust substrate for evaluation of the ferroxidase function of Cp and related enzymes. The catalysis can be followed conveniently in real time by monitoring the solution absorbance at 720 nm, a fingerprint of FeIIHx(Tar)2. The complex is oxidized to its ferric form FeIIIHx(Tar)2 via the overall reaction sequence FeIIHx(Tar)2 → FeII-Cp → FeIII-Cp → FeIIIHx(Tar)2: i.e., Fe(II) is transferred formally from FeIIHx(Tar)2 to the substrate docking/oxidation (SDO) site(s) in Cp, followed by oxidation to product Fe(III) that is trapped again by the ligand. Each Tar ligand in the above bis-complex coordinates the metal center in a meridional tridentate mode involving a pH-sensitive -OH group (pKa > 12), and this imposes rapid Fe(II) and Fe(III) transfer kinetics to facilitate the catalytic process. The formation constants of both the ferrous and ferric complexes at pH 7.0 were determined (log β2' = 13.6 and 21.6, respectively), as well as an average dissociation constant of the SDO site(s) in Cp (log KD' = -7.2).
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Affiliation(s)
- Laura Cortes
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne , Parkville, Victoria 3010, Australia.,The Florey Institute of Neuroscience and Mental Health, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Blaine R Roberts
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Anthony G Wedd
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne , Parkville, Victoria 3010, Australia
| | - Zhiguang Xiao
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne , Parkville, Victoria 3010, Australia.,The Florey Institute of Neuroscience and Mental Health, The University of Melbourne , Parkville, Victoria 3010, Australia
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34
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Conte-Daban A, Borghesani V, Sayen S, Guillon E, Journaux Y, Gontard G, Lisnard L, Hureau C. Link between Affinity and Cu(II) Binding Sites to Amyloid-β Peptides Evaluated by a New Water-Soluble UV-Visible Ratiometric Dye with a Moderate Cu(II) Affinity. Anal Chem 2017; 89:2155-2162. [PMID: 28208266 PMCID: PMC5714188 DOI: 10.1021/acs.analchem.6b04979] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Being able to easily determine the Cu(II) affinity for biomolecules of moderate affinity is important. Such biomolecules include amyloidogenic peptides, such as the well-known amyloid-β peptide involved in Alzheimer's disease. Here, we report the synthesis of a new water-soluble ratiometric Cu(II) dye with a moderate affinity (109 M-1 at pH 7.1) and the characterizations of the Cu(II) corresponding complex by X-ray crystallography, EPR, and XAS spectroscopic methods. UV-vis competition was performed on the Aβ peptide as well as on a wide series of modified peptides, leading to an affinity value of 1.6 × 109 M-1 at pH 7.1 for the Aβ peptide and to a coordination model for the Cu(II) site within the Aβ peptide that agrees with the one mostly accepted currently.
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Affiliation(s)
- Amandine Conte-Daban
- CNRS; LCC (Laboratoire de Chimie de Coordination) ; 205, route de Narbonne, F-31077 Toulouse, France. Université de Toulouse; UPS, INPT ; LCC ; F-31077 Toulouse, France
| | - Valentina Borghesani
- CNRS; LCC (Laboratoire de Chimie de Coordination) ; 205, route de Narbonne, F-31077 Toulouse, France. Université de Toulouse; UPS, INPT ; LCC ; F-31077 Toulouse, France
| | - Stéphanie Sayen
- Université de Reims Champagne Ardenne, Institut de Chimie Moléculaire de Reims (ICMR), UMR 7312 CNRS-URCA, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France
| | - Emmanuel Guillon
- Université de Reims Champagne Ardenne, Institut de Chimie Moléculaire de Reims (ICMR), UMR 7312 CNRS-URCA, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France
| | - Yves Journaux
- Sorbonne Universités, UPMC Univ. Paris 06, UMR 8232, IPCM, F-75005, Paris, France
- CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005, Paris, France
| | - Geoffrey Gontard
- Sorbonne Universités, UPMC Univ. Paris 06, UMR 8232, IPCM, F-75005, Paris, France
- CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005, Paris, France
| | - Laurent Lisnard
- Sorbonne Universités, UPMC Univ. Paris 06, UMR 8232, IPCM, F-75005, Paris, France
- CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005, Paris, France
| | - Christelle Hureau
- CNRS; LCC (Laboratoire de Chimie de Coordination) ; 205, route de Narbonne, F-31077 Toulouse, France. Université de Toulouse; UPS, INPT ; LCC ; F-31077 Toulouse, France
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35
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Alies B, Conte-Daban A, Sayen S, Collin F, Kieffer I, Guillon E, Faller P, Hureau C. Zinc(II) Binding Site to the Amyloid-β Peptide: Insights from Spectroscopic Studies with a Wide Series of Modified Peptides. Inorg Chem 2016; 55:10499-10509. [PMID: 27665863 PMCID: PMC5069684 DOI: 10.1021/acs.inorgchem.6b01733] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The Zn(II) ion has been linked to Alzheimer's disease (AD) due to its ability to modulate the aggregating properties of the amyloid-β (Aβ) peptide, where Aβ aggregation is a central event in the etiology of the disease. Delineating Zn(II) binding properties to Aβ is thus a prerequisite to better grasp its potential role in AD. Because of (i) the flexibility of the Aβ peptide, (ii) the multiplicity of anchoring sites, and (iii) the silent nature of the Zn(II) ion in most classical spectroscopies, this is a difficult task. To overcome these difficulties, we have investigated the impact of peptide alterations (mutations, N-terminal acetylation) on the Zn(Aβ) X-ray absorption spectroscopy fingerprint and on the Zn(II)-induced modifications of the Aβ peptides' NMR signatures. We propose a tetrahedrally bound Zn(II) ion, in which the coordination sphere is made by two His residues and two carboxylate side chains. Equilibria between equivalent ligands for one Zn(II) binding position have also been observed, the predominant site being made by the side chains of His6, His13 or His14, Glu11, and Asp1 or Glu3 or Asp7, with a slight preference for Asp1.
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Affiliation(s)
- Bruno Alies
- CNRS, LCC (Laboratoire de Chimie de Coordination) , 205 Route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France.,Université de Toulouse , UPS, INPT, F-31077 Toulouse Cedex 4, France
| | - Amandine Conte-Daban
- CNRS, LCC (Laboratoire de Chimie de Coordination) , 205 Route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France.,Université de Toulouse , UPS, INPT, F-31077 Toulouse Cedex 4, France
| | - Stéphanie Sayen
- Université Reims Champagne Ardenne , Institut de Chimie Moléculaire de Reims (ICMR), UMR 7312 CNRS-URCA, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France
| | - Fabrice Collin
- CNRS, LCC (Laboratoire de Chimie de Coordination) , 205 Route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France.,Université de Toulouse , UPS, INPT, F-31077 Toulouse Cedex 4, France.,Université de Toulouse , UPS, UMR 152 PHARMA-DEV, Université Toulouse 3, and Institut de Recherche pour le Développement (IRD), UMR 152 PHARMA-DEV, F-31062 Toulouse Cedex 09, France
| | - Isabelle Kieffer
- Observatoire des Sciences de l'Univers de Grenoble (OSUG) , CNRS UMS 832, 414 Rue de la Piscine, 38400 Saint Martin d'Hères, France.,BM30B/FAME, ESRF, The European Synchrotron , 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Emmanuel Guillon
- Université Reims Champagne Ardenne , Institut de Chimie Moléculaire de Reims (ICMR), UMR 7312 CNRS-URCA, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France
| | - Peter Faller
- CNRS, LCC (Laboratoire de Chimie de Coordination) , 205 Route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France.,Université de Toulouse , UPS, INPT, F-31077 Toulouse Cedex 4, France
| | - Christelle Hureau
- CNRS, LCC (Laboratoire de Chimie de Coordination) , 205 Route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France.,Université de Toulouse , UPS, INPT, F-31077 Toulouse Cedex 4, France
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36
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Laurent C, Lekeux G, Ukuwela AA, Xiao Z, Charlier JB, Bosman B, Carnol M, Motte P, Damblon C, Galleni M, Hanikenne M. Metal binding to the N-terminal cytoplasmic domain of the PIB ATPase HMA4 is required for metal transport in Arabidopsis. PLANT MOLECULAR BIOLOGY 2016; 90:453-66. [PMID: 26797794 DOI: 10.1007/s11103-016-0429-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 01/03/2016] [Indexed: 05/26/2023]
Abstract
PIB ATPases are metal cation pumps that transport metals across membranes. These proteins possess N- and C-terminal cytoplasmic extensions that contain Cys- and His-rich high affinity metal binding domains, which may be involved in metal sensing, metal ion selectivity and/or in regulation of the pump activity. The PIB ATPase HMA4 (Heavy Metal ATPase 4) plays a central role in metal homeostasis in Arabidopsis thaliana and has a key function in zinc and cadmium hypertolerance and hyperaccumulation in the extremophile plant species Arabidopsis halleri. Here, we examined the function and structure of the N-terminal cytoplasmic metal-binding domain of HMA4. We mutagenized a conserved CCTSE metal-binding motif in the domain and assessed the impact of the mutations on protein function and localization in planta, on metal-binding properties in vitro and on protein structure by Nuclear Magnetic Resonance spectroscopy. The two Cys residues of the motif are essential for the function, but not for localization, of HMA4 in planta, whereas the Glu residue is important but not essential. These residues also determine zinc coordination and affinity. Zinc binding to the N-terminal domain is thus crucial for HMA4 protein function, whereas it is not required to maintain the protein structure. Altogether, combining in vivo and in vitro approaches in our study provides insights towards the molecular understanding of metal transport and specificity of metal P-type ATPases.
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Affiliation(s)
- Clémentine Laurent
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium
| | - Gilles Lekeux
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium
| | - Ashwinie A Ukuwela
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, VIC, 3010, Australia
| | - Zhiguang Xiao
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, VIC, 3010, Australia
| | - Jean-Benoit Charlier
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium
| | - Bernard Bosman
- Laboratory of Plant and Microbial Ecology, Department of Biology, Ecology, Evolution, University of Liège, 4000, Liège, Belgium
| | - Monique Carnol
- Laboratory of Plant and Microbial Ecology, Department of Biology, Ecology, Evolution, University of Liège, 4000, Liège, Belgium
| | - Patrick Motte
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium
- PhytoSYSTEMS, University of Liège, 4000, Liège, Belgium
| | - Christian Damblon
- Chimie Biologique Structurale, Department of Chemistry, University of Liège, Liège, Belgium
| | - Moreno Galleni
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium
| | - Marc Hanikenne
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium.
- PhytoSYSTEMS, University of Liège, 4000, Liège, Belgium.
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An improved Bathocuproine assay for accurate valence identification and quantification of copper bound by biomolecules. Anal Biochem 2015; 497:27-35. [PMID: 26743717 DOI: 10.1016/j.ab.2015.12.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 12/04/2015] [Accepted: 12/18/2015] [Indexed: 01/06/2023]
Abstract
Copper is an essential metal in all organisms. Reliably quantifying and identifying the copper content and oxidation state is crucial, since the information is essential to understanding protein structure and function. Chromophoric ligands, such as Bathocuproine (BC) and its water-soluble analog, Bathocuproinedisulfonic acid (BCS), preferentially bind Cu(I) over Cu(II), and therefore have been widely used as optical probes to determine the oxidation state of copper bound by biomolecules. However, the BCS assay is commonly misused, leading to erroneous conclusions regarding the role of copper in biological processes. By measuring the redox potential of Cu(II)-BCS2 and conducting UV-vis absorption measurements in the presence of oxidizable amino acids, the thermodynamic origin of the potential artifacts becomes evident. The BCS assay was improved by introducing a strong Cu(II) chelator EDTA prior to the addition of BCS to prevent interference that might arise from Cu(II) present in the sample. The strong Cu(II) chelator rids of all the potential errors inherent in the conventional BCS assay. Applications of the improved assay to peptides and protein containing oxidizable amino acid residues confirm that free Cu(II) no longer leads to artifacts, thereby resolving issues related to this persistently misused colorimetric assay of Cu(I) in biological systems.
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Wijekoon CJK, Ukuwela AA, Wedd AG, Xiao Z. Evaluation of employing poly-lysine tags versus poly-histidine tags for purification and characterization of recombinant copper-binding proteins. J Inorg Biochem 2015; 162:286-294. [PMID: 26766000 DOI: 10.1016/j.jinorgbio.2015.12.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 12/01/2015] [Accepted: 12/16/2015] [Indexed: 01/26/2023]
Abstract
Quantitative characterization of metalloproteins at molecular and atomic levels generally requires tens of milligrams of highly purified samples, a situation frequently challenged by problems in generating unmodified native forms. A variety of affinity tags, such as the popular poly-histidine tag, have been developed to facilitate purification but they generally rely on expensive affinity resins and their presence may interfere with protein characterization. This paper documents that addition of a poly-lysine tag to the C-terminus enables, for the copper-binding proteins examined, ready purification in large scale via cost-effective cation-exchange chromatography. The tag may be removed readily by the enzyme carboxypeptidase B to generate the native protein with no extra residues. However, this cleavage step is normally not necessary since the poly-lysine tag is shown to have no detectable affinity for either Cu(I) or Cu(II) and imposes no interference to the copper binding properties of the target proteins. In contrast, the poly-histidine tag possesses a sub-picomolar affinity for Cu(I) and -nanomolar affinity for Cu(II) and may need to be removed for reliable characterization of the target proteins. These conclusions may be extended to the study of other metallo-proteins and metallo-enzymes.
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Affiliation(s)
- Chathuri J K Wijekoon
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Ashwinie A Ukuwela
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Anthony G Wedd
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Zhiguang Xiao
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia.
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39
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De Ricco R, Valensin D, Dell'Acqua S, Casella L, Hureau C, Faller P. Copper(I/II), α/β-Synuclein and Amyloid-β: Menage à Trois? Chembiochem 2015; 16:2319-28. [PMID: 26338312 DOI: 10.1002/cbic.201500425] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Indexed: 12/12/2022]
Abstract
Copper binding to α-synuclein (aS) and to amyloid-β (Ab) has been connected to Parkinson's and Alzheimer's disease (AD), respectively, because Cu ions can modulate the peptide aggregation, and these Cu ⋅ peptide complexes can catalyse the production of reactive oxygen species (ROS). In a significant proportion of AD brains, aggregation of aS and Ab has been detected, and it was proposed that Ab and aS interact with each other. Thus, we investigated the potential interactions of Ab and aS through their binding of copper(I) and copper(II). Additionally, β-synuclein (bS) was investigated, due to its additional methionine residue, a potential Cu(I) ligand. We found that: 1) the peptides containing the Cu-binding domains Ab1-16, aS1-15 and bS1-15 have similar affinities towards Cu(II) and towards Cu(I), with Ab1-16 being slightly stronger, 2) in the case of Cu(I), the additional Met residue in bS1-15 increased the affinity slightly, 3) the exchange of Cu(I/II) between the two peptides is rapid (≤ ms), 4) a/bS1-15 and Ab1-16 form a heterodimeric complex with Cu(II), 5) Cu(I) probably promotes a transient ternary complex, 6) the different Cu(I/II) coordination of Ab1-16, aS1-15 and bS1-15 impacts the capacity to produce ROS and to oxidise catechol, and 7) when Ab1-16, aS1-15 and Cu are present, the ROS production more closely resembles that by Ab1-16. The work gives insights into the coordination chemistry of these related peptides, and the relevance of coordination differences, the ternary complex and ROS production are discussed.
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Affiliation(s)
- Riccardo De Ricco
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 Route de Narbonne, B. P. 44099, 31077, Toulouse Cedex 4, France.,Université de Toulouse, UPS, INPT, 205 Route de Narbonne, B. P. 44099, 31077, Toulouse Cedex 4, France.,Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Via A. Moro 2, 53100, Siena, Italy
| | - Daniela Valensin
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Via A. Moro 2, 53100, Siena, Italy.
| | - Simone Dell'Acqua
- Department of Chemistry, University of Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Luigi Casella
- Department of Chemistry, University of Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Christelle Hureau
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 Route de Narbonne, B. P. 44099, 31077, Toulouse Cedex 4, France.,Université de Toulouse, UPS, INPT, 205 Route de Narbonne, B. P. 44099, 31077, Toulouse Cedex 4, France
| | - Peter Faller
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 Route de Narbonne, B. P. 44099, 31077, Toulouse Cedex 4, France. .,Université de Toulouse, UPS, INPT, 205 Route de Narbonne, B. P. 44099, 31077, Toulouse Cedex 4, France.
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40
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Xu S, Andrews D, Hill BC. The affinity of yeast and bacterial SCO proteins for CU(I) and CU(II). A capture and release strategy for copper transfer. Biochem Biophys Rep 2015; 4:10-19. [PMID: 29124182 PMCID: PMC5668878 DOI: 10.1016/j.bbrep.2015.08.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 08/11/2015] [Accepted: 08/13/2015] [Indexed: 12/20/2022] Open
Abstract
SCO (Synthesis of Cytochrome c Oxidase) proteins are present in prokaryotic and eukaryotic cells, and are often required for efficient synthesis of the respiratory enzyme cytochrome c oxidase. The Bacillus subtilis version of SCO (i.e., BsSCO) has much greater affinity for Cu(II) than it does for Cu(I) (Davidson and Hill, 2009), and this has been contrasted to mitochondrial SCO proteins that are characterized as being specific for Cu(I) (Nittis, George and Winge, 2001). This differential affinity has been proposed to reflect the different physiological environments in which these two members of the SCO protein family reside. In this study the affinity of mitochondrial SCO1 from yeast is compared directly to that of BsSCO in vitro. We find that the yeast SCO1 protein has similar preference for Cu(II) over Cu(I), as does BsSCO. We propose a mechanism for SCO function which would involve high-affinity binding to capture Cu(II), and relatively weak binding of Cu(I) to facilitate copper transfer. Yeast SCO1 prefers Cu(II) over Cu(I) by many orders of magnitude. Yeast SCO1 has similar copper-species preference as a bacterial SCO protein. High affinity binding of Cu(II) by SCO may be initial step in copper transfer. Conversion of SCO-Cu(II) to SCO-Cu(I) is required for copper transfer. A second cysteine pair in yeast SCO1 may be involved in redox sensing.
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Affiliation(s)
- Shuai Xu
- Department of Biomedical and Molecular Sciences, Queen’s University, Kingston, ON K7L3N6 Canada
| | - Diann Andrews
- Department of Biomedical and Molecular Sciences, Queen’s University, Kingston, ON K7L3N6 Canada
| | - Bruce C. Hill
- Department of Biomedical and Molecular Sciences, Queen’s University, Kingston, ON K7L3N6 Canada
- Protein Function Discovery Research Group, Queen’s University, Kingston, ON K7L3N6 Canada
- Corresponding author at: Department of Biomedical and Molecular Sciences, Queen’s University, Kingston, ON K7L3N6 Canada.Department of Biomedical and Molecular Sciences, Queen’s UniversityKingstonON K7L3N6Canada
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41
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Miłoch A, Krężel A. Metal binding properties of the zinc finger metallome--insights into variations in stability. Metallomics 2015; 6:2015-24. [PMID: 25109667 DOI: 10.1039/c4mt00149d] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Zinc is one of the most widespread metal ions found in biological systems. Of the expected 3000 zinc proteins in the human proteome, most contain zinc in structural sites. Among these structures, the most important are zinc fingers, which are well suited to facilitate interactions with DNA, RNA, proteins and lipid molecules. Knowledge regarding their stability is a critical issue in understanding the function of zinc fingers and their reactivity under fluxing cellular Zn(II) availability and different redox states. Zinc stability constants that have been determined using a variety of methods demonstrate wide diversity. Recent studies on the stability of consensus zinc fingers have demonstrated that the known metal-ion affinities for zinc fingers may have been underestimated by as much as three or more orders of magnitude. Here, using four natural ββα zinc fingers, we compare in detail several different methods that have been used for the determination of zinc finger stability constants, such as common reverse-titration, potentiometry, competition with metal chelators, and a new approach based on a three-step spectrophotometric titration. We discuss why the stabilities of zinc fingers that are determined spectrophotometrically are frequently underestimated due to the lack of effective equilibrium competition, which leads to large errors during the processing of the titration data. The literature stability constants of many natural zinc fingers have been underestimated, and they are significantly lower when compared with the consensus peptides. Our data show that in the cell, some naturally occurring zinc fingers may potentially be unoccupied and are instead loaded transiently with Zn(II). Large variations in stability within the same class of zinc fingers have demonstrated that the thermodynamic effects hidden in the sequence and structure are the key elements responsible for the differentiation of the stability of the zinc finger metallome.
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Affiliation(s)
- Anna Miłoch
- Laboratory of Chemical Biology, Faculty of Biotechnology, University of Wrocław, Joliot-Curie 14a, 50-383 Wrocław, Poland.
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42
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Atrián-Blasco E, Cerrada E, Conte-Daban A, Testemale D, Faller P, Laguna M, Hureau C. Copper(I) targeting in the Alzheimer's disease context: a first example using the biocompatible PTA ligand. Metallomics 2015; 7:1229-32. [PMID: 25926057 DOI: 10.1039/c5mt00077g] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copper(I) coordinating ligands in the Alzheimer's disease context have remained unexplored, despite the biological relevance of this redox state of the copper ion. Here, we show that the PTA ligand can remove copper from Aβ, prevent reactive oxygen species production and oligomer formation, two deleterious events in the disease's etiology.
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Affiliation(s)
- E Atrián-Blasco
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne et Université de Toulouse, F-31077 Toulouse, France.
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43
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Nasica-Labouze J, Nguyen PH, Sterpone F, Berthoumieu O, Buchete NV, Coté S, De Simone A, Doig AJ, Faller P, Garcia A, Laio A, Li MS, Melchionna S, Mousseau N, Mu Y, Paravastu A, Pasquali S, Rosenman DJ, Strodel B, Tarus B, Viles JH, Zhang T, Wang C, Derreumaux P. Amyloid β Protein and Alzheimer's Disease: When Computer Simulations Complement Experimental Studies. Chem Rev 2015; 115:3518-63. [PMID: 25789869 DOI: 10.1021/cr500638n] [Citation(s) in RCA: 475] [Impact Index Per Article: 52.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jessica Nasica-Labouze
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Phuong H Nguyen
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Fabio Sterpone
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Olivia Berthoumieu
- ‡LCC (Laboratoire de Chimie de Coordination), CNRS, Université de Toulouse, Université Paul Sabatier (UPS), Institut National Polytechnique de Toulouse (INPT), 205 route de Narbonne, BP 44099, Toulouse F-31077 Cedex 4, France
| | | | - Sébastien Coté
- ∥Département de Physique and Groupe de recherche sur les protéines membranaires (GEPROM), Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec H3C 3T5, Canada
| | - Alfonso De Simone
- ⊥Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Andrew J Doig
- #Manchester Institute of Biotechnology, University of Manchester, 131 Princess Street, Manchester M1 7DN, United Kingdom
| | - Peter Faller
- ‡LCC (Laboratoire de Chimie de Coordination), CNRS, Université de Toulouse, Université Paul Sabatier (UPS), Institut National Polytechnique de Toulouse (INPT), 205 route de Narbonne, BP 44099, Toulouse F-31077 Cedex 4, France
| | | | - Alessandro Laio
- ○The International School for Advanced Studies (SISSA), Via Bonomea 265, 34136 Trieste, Italy
| | - Mai Suan Li
- ◆Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland.,¶Institute for Computational Science and Technology, SBI Building, Quang Trung Software City, Tan Chanh Hiep Ward, District 12, Ho Chi Minh City, Vietnam
| | - Simone Melchionna
- ⬠Instituto Processi Chimico-Fisici, CNR-IPCF, Consiglio Nazionale delle Ricerche, 00185 Roma, Italy
| | | | - Yuguang Mu
- ▲School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, 637551 Singapore
| | - Anant Paravastu
- ⊕National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Samuela Pasquali
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | | | - Birgit Strodel
- △Institute of Complex Systems: Structural Biochemistry (ICS-6), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Bogdan Tarus
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - John H Viles
- ▼School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, United Kingdom
| | - Tong Zhang
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France.,▲School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, 637551 Singapore
| | | | - Philippe Derreumaux
- †Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique (IBPC), UPR9080 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France.,□Institut Universitaire de France, 75005 Paris, France
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44
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Cotruvo JA, Aron AT, Ramos-Torres KM, Chang CJ. Synthetic fluorescent probes for studying copper in biological systems. Chem Soc Rev 2015; 44:4400-14. [PMID: 25692243 DOI: 10.1039/c4cs00346b] [Citation(s) in RCA: 362] [Impact Index Per Article: 40.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The potent redox activity of copper is required for sustaining life. Mismanagement of its cellular pools, however, can result in oxidative stress and damage connected to aging, neurodegenerative diseases, and metabolic disorders. Therefore, copper homeostasis is tightly regulated by cells and tissues. Whereas copper and other transition metal ions are commonly thought of as static cofactors buried within protein active sites, emerging data points to the presence of additional loosely bound, labile pools that can participate in dynamic signalling pathways. Against this backdrop, we review advances in sensing labile copper pools and understanding their functions using synthetic fluorescent indicators. Following brief introductions to cellular copper homeostasis and considerations in sensor design, we survey available fluorescent copper probes and evaluate their properties in the context of their utility as effective biological screening tools. We emphasize the need for combined chemical and biological evaluation of these reagents, as well as the value of complementing probe data with other techniques for characterizing the different pools of metal ions in biological systems. This holistic approach will maximize the exciting opportunities for these and related chemical technologies in the study and discovery of novel biology of metals.
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Affiliation(s)
- Joseph A Cotruvo
- Department of Chemistry, University of California, Berkeley, CA 94720, USA.
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45
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Jullien AS, Gateau C, Lebrun C, Delangle P. Pseudo-peptides Based on Methyl Cysteine or Methionine Inspired from Mets Motifs Found in the Copper Transporter Ctr1. Inorg Chem 2015; 54:2339-44. [DOI: 10.1021/ic502962d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Anne-Solène Jullien
- Univ. Grenoble Alpes, INAC-SCIB, F-38000 Grenoble, France
- CEA, INAC-SCIB,
Reconnaissance Ionique et Chimie de Coordination, F-38000 Grenoble, France
| | - Christelle Gateau
- Univ. Grenoble Alpes, INAC-SCIB, F-38000 Grenoble, France
- CEA, INAC-SCIB,
Reconnaissance Ionique et Chimie de Coordination, F-38000 Grenoble, France
| | - Colette Lebrun
- Univ. Grenoble Alpes, INAC-SCIB, F-38000 Grenoble, France
- CEA, INAC-SCIB,
Reconnaissance Ionique et Chimie de Coordination, F-38000 Grenoble, France
| | - Pascale Delangle
- Univ. Grenoble Alpes, INAC-SCIB, F-38000 Grenoble, France
- CEA, INAC-SCIB,
Reconnaissance Ionique et Chimie de Coordination, F-38000 Grenoble, France
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46
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Young TR, Wijekoon CJK, Spyrou B, Donnelly PS, Wedd AG, Xiao Z. A set of robust fluorescent peptide probes for quantification of Cu(ii) binding affinities in the micromolar to femtomolar range. Metallomics 2015; 7:567-78. [DOI: 10.1039/c4mt00301b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A set of four fluorescent probes were developed and demonstrated to be capable of quantifying Cu(ii) binding affinities in the micromolar to femtomolar range and exploring Cu(ii) binding ligands in peptides and proteins.
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Affiliation(s)
- Tessa R. Young
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
| | - Chathuri J. K. Wijekoon
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
| | - Benjamin Spyrou
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
| | - Paul S. Donnelly
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
| | - Anthony G. Wedd
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
| | - Zhiguang Xiao
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- Parkville, Australia
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47
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Shen C, New EJ. What has fluorescent sensing told us about copper and brain malfunction? Metallomics 2015; 7:56-65. [DOI: 10.1039/c4mt00288a] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Here we review the development and application of fluorescent sensors for studying copper in the brain.
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Affiliation(s)
- Clara Shen
- School of Chemistry
- The University of Sydney
- , Australia
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48
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Brose J, La Fontaine S, Wedd AG, Xiao Z. Redox sulfur chemistry of the copper chaperone Atox1 is regulated by the enzyme glutaredoxin 1, the reduction potential of the glutathione couple GSSG/2GSH and the availability of Cu(I). Metallomics 2014; 6:793-808. [PMID: 24522867 DOI: 10.1039/c4mt00020j] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Glutaredoxins have been characterised as enzymes regulating the redox status of protein thiols via cofactors GSSG/GSH. However, such a function has not been demonstrated with physiologically relevant protein substrates in in vitro experiments. Their active sites frequently feature a Cys-xx-Cys motif that is predicted not to bind metal ions. Such motifs are also present in copper-transporting proteins such as Atox1, a human cytosolic copper metallo-chaperone. In this work, we present the first demonstration that: (i) human glutaredoxin 1 (hGrx1) efficiently catalyses interchange of the dithiol and disulfide forms of the Cys(12)-xx-Cys(15) fragment in Atox1 but does not act upon the isolated single residue Cys(41); (ii) the direction of catalysis is regulated by the GSSG/2GSH ratio and the availability of Cu(I); (iii) the active site Cys(23)-xx-Cys(26) in hGrx1 can bind Cu(I) tightly with femtomolar affinity (K(D) = 10(-15.5) M) and possesses a reduction potential of E(o)' = -118 mV at pH 7.0. In contrast, the Cys(12)-xx-Cys(15) motif in Atox1 has a higher affinity for Cu(I) (K(D) = 10(-17.4) M) and a more negative potential (E(o)' = -188 mV). These differences may be attributed primarily to the very low pKa of Cys23 in hGrx1 and allow rationalisation of conclusion (ii) above: hGrx1 may catalyse the oxidation of Atox1(dithiol) by GSSG, but not the complementary reduction of the oxidised Atox1(disulfide) by GSH unless Cu(aq)(+) is present at a concentration that allows binding of Cu(I) to reduced Atox1 but not to hGrx1. In fact, in the latter case, the catalytic preferences are reversed. Both Cys residues in the active site of hGrx1 are essential for the high affinity Cu(I) binding but the single Cys(23) residue only is required for the redox catalytic function. The molecular properties of both Atox1 and hGrx1 are consistent with a correlation between copper homeostasis and redox sulfur chemistry, as suggested by recent cell experiments. These proteins appear to have evolved the features necessary to fill multiple roles in redox regulation, Cu(I) buffering and Cu(I) transport.
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Affiliation(s)
- Jens Brose
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia.
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49
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Leong SL, Young TR, Barnham KJ, Wedd AG, Hinds MG, Xiao Z, Cappai R. Quantification of copper binding to amyloid precursor protein domain 2 and its Caenorhabditis elegans ortholog. Implications for biological function. Metallomics 2014; 6:105-16. [DOI: 10.1039/c3mt00258f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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50
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Young TR, Kirchner A, Wedd AG, Xiao Z. An integrated study of the affinities of the Aβ16 peptide for Cu(i) and Cu(ii): implications for the catalytic production of reactive oxygen species. Metallomics 2014; 6:505-17. [DOI: 10.1039/c4mt00001c] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Affinities of Aβ16 peptide and several selected variants for Cu(i) and Cu(ii) were determined with new probes and correlated to their binding modes and abilities in promoting ROS generation.
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Affiliation(s)
- Tessa R. Young
- The Bio21 Molecular Science and Biotechnology Institute
- The University of Melbourne
- Victoria 3010, Australia
- School of Chemistry
- The University of Melbourne
| | - Angie Kirchner
- The Bio21 Molecular Science and Biotechnology Institute
- The University of Melbourne
- Victoria 3010, Australia
- School of Chemistry
- The University of Melbourne
| | - Anthony G. Wedd
- The Bio21 Molecular Science and Biotechnology Institute
- The University of Melbourne
- Victoria 3010, Australia
- School of Chemistry
- The University of Melbourne
| | - Zhiguang Xiao
- The Bio21 Molecular Science and Biotechnology Institute
- The University of Melbourne
- Victoria 3010, Australia
- School of Chemistry
- The University of Melbourne
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