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Kotuniak R, Bal W. Reactive Cu2+-peptide intermediates revealed by kinetic studies gain relevance by matching time windows in copper metallomics. Metallomics 2023; 15:7036795. [PMID: 36787891 PMCID: PMC10382716 DOI: 10.1093/mtomcs/mfad007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 02/10/2023] [Indexed: 02/16/2023]
Abstract
The purpose of this essay is to propose that metallomic studies in the area of extracellular copper transport are incomplete without the explicit consideration of kinetics of Cu2+ion binding and exchange reactions. The kinetic data should be interpreted in the context of time constraints imposed by specific physiological processes. Examples from experimental studies of Cu2+ ion interactions with amino-terminal copper and nickel binding site/N-terminal site motifs are used to demonstrate that duration and periodicity of such processes as bloodstream transport or neurotransmission promote the reaction intermediates to the role of physiological effectors. The unexpectedly long lifetimes of intermediate complexes lead to their accumulation and novel reactivities. The emerging ideas are discussed in the context of other research areas in metallomics.
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Affiliation(s)
- Radosław Kotuniak
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
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Kotuniak R, Szczerba P, Sudzik D, Strampraad MJ, Hagedoorn PL, Bal W. The rates of Cu(II)-ATCUN complex formation. Why so slow? Dalton Trans 2022; 51:17553-17557. [DOI: 10.1039/d2dt02856e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We used a series of modified/substituted GGH analogues to investigate the kinetics of Cu(II) binding to ACTUN peptides. Rules for rate modulation by 1st and 2nd sphere interactions were established,...
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Kotuniak R, Bal W. Kinetics of Cu(II) complexation by ATCUN/NTS and related peptides: a gold mine of novel ideas for copper biology. Dalton Trans 2021; 51:14-26. [PMID: 34816848 DOI: 10.1039/d1dt02878b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Cu(II)-peptide complexes are intensely studied as models for biological peptides and proteins and for their direct importance in copper homeostasis and dyshomeostasis in human diseases. In particular, high-affinity ATCUN/NTS (amino-terminal copper and nickel/N-terminal site) motifs present in proteins and peptides are considered as Cu(II) transport agents for copper delivery to cells. The information on the affinities and structures of such complexes derived from steady-state methods appears to be insufficient to resolve the mechanisms of copper trafficking, while kinetic studies have recently shown promise in explaining them. Stopped-flow experiments of Cu(II) complexation to ATCUN/NTS peptides revealed the presence of reaction steps with rates much slower than the diffusion limit due to the formation of novel intermediate species. Herein, the state of the field in Cu(II)-peptide kinetics is reviewed in the context of physiological data, leading to novel ideas in copper biology, together with the discussion of current methodological issues.
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Affiliation(s)
- Radosław Kotuniak
- Institute of Biochemistry and Biophysics, Polish Academy of Science, Pawińskiego 5a, 02-106 Warsaw, Poland.
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Science, Pawińskiego 5a, 02-106 Warsaw, Poland.
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Płonka D, Kotuniak R, Dąbrowska K, Bal W. Electrospray-Induced Mass Spectrometry Is Not Suitable for Determination of Peptidic Cu(II) Complexes. J Am Soc Mass Spectrom 2021; 32:2766-2776. [PMID: 34738801 PMCID: PMC8640992 DOI: 10.1021/jasms.1c00206] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 10/22/2021] [Accepted: 10/25/2021] [Indexed: 06/13/2023]
Abstract
The toolset of mass spectrometry (MS) is still expanding, and the number of metal ion complexes researched this way is growing. The Cu(II) ion forms particularly strong peptide complexes of biological interest which are frequent objects of MS studies, but quantitative aspects of some reported results are at odds with those of experiments performed in solution. Cu(II) complexes are usually characterized by fast ligand exchange rates, despite their high affinity, and we speculated that such kinetic lability could be responsible for the observed discrepancies. In order to resolve this issue, we selected peptides belonging to the ATCUN family characterized with high and thoroughly determined Cu(II) binding constants and re-estimated them using two ESI-MS techniques: standard conditions in combination with serial dilution experiments and very mild conditions for competition experiments. The sample acidification, which accompanies the electrospray formation, was simulated with the pH-jump stopped-flow technique. Our results indicate that ESI-MS should not be used for quantitative studies of Cu(II)-peptide complexes because the electrospray formation process compromises the entropic contribution to the complex stability, yielding underestimations of complex stability constants.
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Catapano MC, Parsons DS, Kotuniak R, Mladěnka P, Bal W, Maret W. Probing the Structure and Function of the Cytosolic Domain of the Human Zinc Transporter ZnT8 with Nickel(II) Ions. Int J Mol Sci 2021; 22:2940. [PMID: 33799326 PMCID: PMC8000985 DOI: 10.3390/ijms22062940] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 03/08/2021] [Accepted: 03/09/2021] [Indexed: 11/30/2022] Open
Abstract
The human zinc transporter ZnT8 provides the granules of pancreatic β-cells with zinc (II) ions for assembly of insulin hexamers for storage. Until recently, the structure and function of human ZnTs have been modelled on the basis of the 3D structures of bacterial zinc exporters, which form homodimers with each monomer having six transmembrane α-helices harbouring the zinc transport site and a cytosolic domain with an α,β structure and additional zinc-binding sites. However, there are important differences in function as the bacterial proteins export an excess of zinc ions from the bacterial cytoplasm, whereas ZnT8 exports zinc ions into subcellular vesicles when there is no apparent excess of cytosolic zinc ions. Indeed, recent structural investigations of human ZnT8 show differences in metal binding in the cytosolic domain when compared to the bacterial proteins. Two common variants, one with tryptophan (W) and the other with arginine (R) at position 325, have generated considerable interest as the R-variant is associated with a higher risk of developing type 2 diabetes. Since the mutation is at the apex of the cytosolic domain facing towards the cytosol, it is not clear how it can affect zinc transport through the transmembrane domain. We expressed the cytosolic domain of both variants of human ZnT8 and have begun structural and functional studies. We found that (i) the metal binding of the human protein is different from that of the bacterial proteins, (ii) the human protein has a C-terminal extension with three cysteine residues that bind a zinc(II) ion, and (iii) there are small differences in stability between the two variants. In this investigation, we employed nickel(II) ions as a probe for the spectroscopically silent Zn(II) ions and utilised colorimetric and fluorimetric indicators for Ni(II) ions to investigate metal binding. We established Ni(II) coordination to the C-terminal cysteines and found differences in metal affinity and coordination in the two ZnT8 variants. These structural differences are thought to be critical for the functional differences regarding the diabetes risk. Further insight into the assembly of the metal centres in the cytosolic domain was gained from potentiometric investigations of zinc binding to synthetic peptides corresponding to N-terminal and C-terminal sequences of ZnT8 bearing the metal-coordinating ligands. Our work suggests the involvement of the C-terminal cysteines, which are part of the cytosolic domain, in a metal chelation and/or acquisition mechanism and, as now supported by the high-resolution structural work, provides the first example of metal-thiolate coordination chemistry in zinc transporters.
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Affiliation(s)
- Maria Carmen Catapano
- Departments of Biochemistry and Nutritional Sciences, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King’s College London, Franklin-Wilkins Bldg, 150 Stamford St., London SE1 9NH, UK; (M.C.C.); (D.S.P.)
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203, 500 05 Hradec Králové, Czech Republic
| | - Douglas S. Parsons
- Departments of Biochemistry and Nutritional Sciences, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King’s College London, Franklin-Wilkins Bldg, 150 Stamford St., London SE1 9NH, UK; (M.C.C.); (D.S.P.)
- Department of Radiology, Boston University School of Medicine, 670 Albany Street, Boston, MA 02118, USA
| | - Radosław Kotuniak
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland; (R.K.); (W.B.)
| | - Přemysl Mladěnka
- Department of Pharmacology and Toxicology, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203, 500 05 Hradec Králové, Czech Republic;
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland; (R.K.); (W.B.)
| | - Wolfgang Maret
- Departments of Biochemistry and Nutritional Sciences, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King’s College London, Franklin-Wilkins Bldg, 150 Stamford St., London SE1 9NH, UK; (M.C.C.); (D.S.P.)
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Kotuniak R, Strampraad MJF, Bossak‐Ahmad K, Wawrzyniak UE, Ufnalska I, Hagedoorn P, Bal W. Frontispiz: Key Intermediate Species Reveal the Copper(II)‐Exchange Pathway in Biorelevant ATCUN/NTS Complexes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202082861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Radosław Kotuniak
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Marc J. F. Strampraad
- Department of Biotechnology Delft University of Technology Van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Karolina Bossak‐Ahmad
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Urszula E. Wawrzyniak
- Chair of Medical Biotechnology Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Iwona Ufnalska
- Chair of Medical Biotechnology Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Peter‐Leon Hagedoorn
- Department of Biotechnology Delft University of Technology Van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Wojciech Bal
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
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Kotuniak R, Strampraad MJF, Bossak‐Ahmad K, Wawrzyniak UE, Ufnalska I, Hagedoorn P, Bal W. Key Intermediate Species Reveal the Copper(II)-Exchange Pathway in Biorelevant ATCUN/NTS Complexes. Angew Chem Int Ed Engl 2020; 59:11234-11239. [PMID: 32267054 PMCID: PMC7383912 DOI: 10.1002/anie.202004264] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Indexed: 01/31/2023]
Abstract
The amino-terminal copper and nickel/N-terminal site (ATCUN/NTS) present in proteins and bioactive peptides exhibits high affinity towards CuII ions and have been implicated in human copper physiology. Little is known, however, about the rate and exact mechanism of formation of such complexes. We used the stopped-flow and microsecond freeze-hyperquenching (MHQ) techniques supported by steady-state spectroscopic and electrochemical data to demonstrate the formation of partially coordinated intermediate CuII complexes formed by glycyl-glycyl-histidine (GGH) peptide, the simplest ATCUN/NTS model. One of these novel intermediates, characterized by two-nitrogen coordination, t1/2 ≈100 ms at pH 6.0 and the ability to maintain the CuII /CuI redox pair is the best candidate for the long-sought reactive species in extracellular copper transport.
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Affiliation(s)
- Radosław Kotuniak
- Department of BiophysicsInstitute of Biochemistry and Biophysics Polish Academy of SciencesPawińskiego 5a02-106WarsawPoland
| | - Marc J. F. Strampraad
- Department of BiotechnologyDelft University of TechnologyVan der Maasweg 92629HZDelftThe Netherlands
| | - Karolina Bossak‐Ahmad
- Department of BiophysicsInstitute of Biochemistry and Biophysics Polish Academy of SciencesPawińskiego 5a02-106WarsawPoland
| | - Urszula E. Wawrzyniak
- Chair of Medical BiotechnologyFaculty of ChemistryWarsaw University of TechnologyNoakowskiego 300-664WarsawPoland
| | - Iwona Ufnalska
- Chair of Medical BiotechnologyFaculty of ChemistryWarsaw University of TechnologyNoakowskiego 300-664WarsawPoland
| | - Peter‐Leon Hagedoorn
- Department of BiotechnologyDelft University of TechnologyVan der Maasweg 92629HZDelftThe Netherlands
| | - Wojciech Bal
- Department of BiophysicsInstitute of Biochemistry and Biophysics Polish Academy of SciencesPawińskiego 5a02-106WarsawPoland
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Kotuniak R, Strampraad MJF, Bossak‐Ahmad K, Wawrzyniak UE, Ufnalska I, Hagedoorn P, Bal W. Frontispiece: Key Intermediate Species Reveal the Copper(II)‐Exchange Pathway in Biorelevant ATCUN/NTS Complexes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/anie.202082861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Radosław Kotuniak
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Marc J. F. Strampraad
- Department of Biotechnology Delft University of Technology Van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Karolina Bossak‐Ahmad
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Urszula E. Wawrzyniak
- Chair of Medical Biotechnology Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Iwona Ufnalska
- Chair of Medical Biotechnology Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Peter‐Leon Hagedoorn
- Department of Biotechnology Delft University of Technology Van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Wojciech Bal
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
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Kotuniak R, Strampraad MJF, Bossak‐Ahmad K, Wawrzyniak UE, Ufnalska I, Hagedoorn P, Bal W. Key Intermediate Species Reveal the Copper(II)‐Exchange Pathway in Biorelevant ATCUN/NTS Complexes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004264] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Radosław Kotuniak
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Marc J. F. Strampraad
- Department of Biotechnology Delft University of Technology Van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Karolina Bossak‐Ahmad
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Urszula E. Wawrzyniak
- Chair of Medical Biotechnology Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Iwona Ufnalska
- Chair of Medical Biotechnology Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Peter‐Leon Hagedoorn
- Department of Biotechnology Delft University of Technology Van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Wojciech Bal
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
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Teng X, Stefaniak E, Girvan P, Kotuniak R, Płonka D, Bal W, Ying L. Hierarchical binding of copperII to N-truncated Aβ4–16 peptide. Metallomics 2020; 12:470-473. [DOI: 10.1039/c9mt00299e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Multiple intermediates were found in Cu(ii) binding to Aβ4–16 before the formation of a tight complex.
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Affiliation(s)
- Xiangyu Teng
- Department of Chemistry
- Imperial College London
- Molecular Sciences Research Hub
- White City Campus
- London W12 0BZ
| | - Ewelina Stefaniak
- Institute of Biochemistry and Biophysics
- Polish Academy of Sciences
- 02-106 Warsaw
- Poland
| | - Paul Girvan
- Department of Chemistry
- Imperial College London
- Molecular Sciences Research Hub
- White City Campus
- London W12 0BZ
| | - Radosław Kotuniak
- Institute of Biochemistry and Biophysics
- Polish Academy of Sciences
- 02-106 Warsaw
- Poland
| | - Dawid Płonka
- Institute of Biochemistry and Biophysics
- Polish Academy of Sciences
- 02-106 Warsaw
- Poland
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics
- Polish Academy of Sciences
- 02-106 Warsaw
- Poland
| | - Liming Ying
- National Heart and Lung Institute
- Imperial College London
- Molecular Sciences Research Hub
- White City Campus
- London W12 0BZ
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Kotuniak R, Fra̧czyk T, Skrobecki P, Płonka D, Bal W. Gly-His-Thr-Asp-Amide, an Insulin-Activating Peptide from the Human Pancreas Is a Strong Cu(II) but a Weak Zn(II) Chelator. Inorg Chem 2018; 57:15507-15516. [DOI: 10.1021/acs.inorgchem.8b02841] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Radosław Kotuniak
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
| | - Tomasz Fra̧czyk
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
- Department of Immunology, Transplantology and Internal Medicine, Medical University of Warsaw, Nowogrodzka 59, 02-006 Warsaw, Poland
| | - Piotr Skrobecki
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
| | - Dawid Płonka
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
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