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Borghesani V, Zastrow ML, Tolbert AE, Deb A, Penner-Hahn JE, Pecoraro VL. Co(II) Substitution Enhances the Esterase Activity of a de Novo Designed Zn(II) Carbonic Anhydrase. Chemistry 2024; 30:e202304367. [PMID: 38377169 PMCID: PMC11045307 DOI: 10.1002/chem.202304367] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 02/16/2024] [Accepted: 02/20/2024] [Indexed: 02/22/2024]
Abstract
Carbonic Anhydrases (CAs) have been a target for de novo protein designers due to the simplicity of the active site and rapid rate of the reaction. The first reported mimic contained a Zn(II) bound to three histidine imidazole nitrogens and an exogenous water molecule, hence closely mimicking the native enzymes' first coordination sphere. Co(II) has served as an alternative metal to interrogate CAs due to its d7 electronic configuration for more detailed solution characterization. We present here the Co(II) substituted [Co(II)(H2O/OH-)]N(TRIL2WL23H)3 n+ that behaves similarly to native Co(II) substituted human-CAs. Like the Zn(II) analogue, the cobalt-derivative at slightly basic pH is incapable of hydrolyzing p-nitrophenylacetate (pNPA); however, as the pH is increased a significant activity develops, which at pH values above 10 eventually yields a catalytic efficiency that exceeds that of the [Zn(II)(OH-)]N(TRIL2WL23H)3 + peptide complex. X-ray absorption analysis is consistent with an octahedral species at pH 7.5 that converts to a 5-coordinate species by pH 11. UV-vis spectroscopy can monitor this transition, giving a pKa for the conversion of 10.3. We assign this conversion to the formation of a 5-coordinate Co(II)(Nimid)3(OH)(H2O) species. The pH dependent kinetic analysis indicates the maximal rate (kcat), and thus the catalytic efficiency (kcat/Km), follow the same pH profile as the spectroscopic conversion to the pentacoordinate species. This correlation suggests that the chemically irreversible ester hydrolysis corresponds to the rate determining process.
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Affiliation(s)
- Valentina Borghesani
- Department of Chemistry and Biophysics, University of Michigan, Ann Arbor, MI-48109-1055, United States
- Department of Chemistry, Life Sciences, and Environmental Sustainability, University of Parma, Parco Area delle, Scienze 11A, 43124, Parma, Italy
| | - Melissa L Zastrow
- Department of Chemistry and Biophysics, University of Michigan, Ann Arbor, MI-48109-1055, United States
- Department of Chemistry, University of Houston, 3585 Cullen Blvd, Houston, TX-77204, United States
| | - Audrey E Tolbert
- Department of Chemistry and Biophysics, University of Michigan, Ann Arbor, MI-48109-1055, United States
| | - Aniruddha Deb
- Department of Chemistry and Biophysics, University of Michigan, Ann Arbor, MI-48109-1055, United States
| | - James E Penner-Hahn
- Department of Chemistry and Biophysics, University of Michigan, Ann Arbor, MI-48109-1055, United States
| | - Vincent L Pecoraro
- Department of Chemistry and Biophysics, University of Michigan, Ann Arbor, MI-48109-1055, United States
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Melegari M, Marzaroli V, Polisicchio R, Seletti D, Marchiò L, Pecoraro VL, Tegoni M. Insights on the Structure in Solution of Paramagnetic Ln III/Ga III 12-Metallacrown-4 Complexes Using 1D 1H NMR and Model Structures. Inorg Chem 2023. [PMID: 37350768 DOI: 10.1021/acs.inorgchem.3c00983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/24/2023]
Abstract
The solution structure of LnIIINaI(OBz)4[12-MCGaIII(N)Shi-4] complexes was studied through paramagnetic 1H NMR and DFT models. Although isostructural in the solid state, their 1H NMR spectra in DMSO-d6 are extremely different from one another due to the magnetic anisotropy of the lanthanide(III) ions. NMR data were analyzed by the "all-lanthanide" method that were compared to X-ray structures and model structures, allowing to establish the extent of the structural changes that occur from the solid state to the solution phase. Major structural changes involve the phenyl groups of the benzoate ions that, quite surprisingly, in solution present preferential orientations lowering the symmetry of the complex contrary to what observed in the solid state. Overall, DFT methods and 1D NMR data allowed us to clarify aspects related to molecular rearrangement processes in solution that could not be predicted by a simple look at the X-ray structures of these complexes.
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Affiliation(s)
- Matteo Melegari
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17A, Parma 43124, Italy
| | - Vittoria Marzaroli
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17A, Parma 43124, Italy
| | - Rosy Polisicchio
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17A, Parma 43124, Italy
| | - Davide Seletti
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17A, Parma 43124, Italy
| | - Luciano Marchiò
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17A, Parma 43124, Italy
| | - Vincent L Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Matteo Tegoni
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17A, Parma 43124, Italy
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Bragança PMS, Carepo MSP, Pauleta SR, Pinter TBJ, Elia M, Cordas CM, Moura I, Pecoraro VL, Moura JJG. Incorporation of a molybdenum atom in a Rubredoxin-type Centre of a de novo-designed α 3DIV-L21C three-helical bundle peptide. J Inorg Biochem 2023; 240:112096. [PMID: 36603242 DOI: 10.1016/j.jinorgbio.2022.112096] [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: 09/29/2022] [Revised: 11/17/2022] [Accepted: 12/04/2022] [Indexed: 12/24/2022]
Abstract
The rational design and functionalization of small, simple, and stable peptides scaffolds is an attractive avenue to mimic catalytic metal-centres of complex proteins, relevant for the design of metalloenzymes with environmental, biotechnological and health impacts. The de novo designed α3DIV-L21C framework has a rubredoxin-like metal binding site and was used in this work to incorporate a Mo-atom. Thermostability studies using differential scanning calorimetry showed an increase of 4 °C in the melting temperature of the Mo-α3DIV-L21C when compared to the apo-α3DIV-L21C. Circular dichroism in the visible and far-UV regions corroborated these results showing that Mo incorporation provides stability to the peptide even though there were almost no differences observed in the secondary structure. A formal reduction potential of ∼ -408 mV vs. NHE, pH 7.6 was determined. Combining electrochemical results, EPR and UV-visible data we discuss the oxidation state of the molybdenum centre in Mo-α3DIV-L21C and propose that is mainly in a Mo (VI) oxidation state.
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Affiliation(s)
- Pedro M S Bragança
- LAQV, REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal; Microbial Stress Lab, UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal; Associate Laboratory i4HB - Institute for Health and Bioeconomy, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Marta S P Carepo
- LAQV, REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal; Escola de Psicologia e Ciências da Vida, Departamento de Ciências da Vida, Universidade Lusófona de Humanidades e Tecnologias, Campo Grande, 1749-024 Lisboa, Portugal.
| | - Sofia R Pauleta
- Microbial Stress Lab, UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal; Associate Laboratory i4HB - Institute for Health and Bioeconomy, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Tyler B J Pinter
- Department of Chemistry and Biophysics, University of Michigan, Ann Arbor, MI 48109-1055, United States
| | - Maddalena Elia
- LAQV, REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Cristina M Cordas
- LAQV, REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Isabel Moura
- LAQV, REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Vincent L Pecoraro
- Department of Chemistry and Biophysics, University of Michigan, Ann Arbor, MI 48109-1055, United States
| | - José J G Moura
- LAQV, REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.
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Fromsejer R, Jensen ML, Zacate MO, Karner VL, Pecoraro VL, Hemmingsen L. Molecular Rotational Correlation Times and Nanoviscosity Determined by 111m Cd Perturbed Angular Correlation (PAC) of γ-rays Spectroscopy. Chemistry 2023; 29:e202203084. [PMID: 36453728 PMCID: PMC10108235 DOI: 10.1002/chem.202203084] [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: 10/03/2022] [Revised: 12/01/2022] [Accepted: 12/01/2022] [Indexed: 12/05/2022]
Abstract
The nanoviscosity experienced by molecules in solution may be determined through measurement of the molecular rotational correlation time, τc , for example, by fluorescence and NMR spectroscopy. With this work, we apply PAC spectroscopy to determine the rate of rotational diffusion, λ=1/τc , of a de novo designed protein, TRIL12AL16C, in solutions with viscosities, ξ, from 1.7 to 88 mPa⋅s. TRIL12AL16C was selected as molecular probe because it exhibits minimal effects due to intramolecular dynamics and static line broadening, allowing for exclusive elucidation of molecular rotational diffusion. Diffusion rates determined by PAC data agree well with literature data from fluorescence and NMR spectroscopy, and scales linearly with 1/ξ in agreement with the Stokes-Einstein-Debye model. PAC experiments require only trace amounts (∼1011 ) of probe nuclei and can be conducted over a broad range of sample temperatures and pressures. Moreover, most materials are relatively transparent to γ-rays. Thus, PAC spectroscopy could find applications under circumstances where conventional techniques cannot be applied, spanning from the physics of liquids to in-vivo biochemistry.
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Affiliation(s)
- Rasmus Fromsejer
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, København, Denmark
| | - Marianne L Jensen
- Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100, København, Denmark
| | - Matthew O Zacate
- Department of Physics, Geology and Engineering Technology, Northern Kentucky University, Highland Heights, KY 41099-1900, USA
| | | | - Vincent L Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, 930N. University Ave., Ann Arbor, MI 48109-1055, USA
| | - Lars Hemmingsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, København, Denmark
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5
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Salerno EV, Carneiro Neto AN, Eliseeva SV, Hernández-Rodríguez MA, Lutter JC, Lathion T, Kampf JW, Petoud S, Carlos LD, Pecoraro VL. Tunable Optical Molecular Thermometers Based on Metallacrowns. J Am Chem Soc 2022; 144:18259-18271. [PMID: 36173924 DOI: 10.1021/jacs.2c04821] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The effect of ligands' energy levels on thermal dependence of lanthanide emission was examined to create new molecular nanothermometers. A series of Ln2Ga8L8'L8″ metallacrowns (shorthand Ln2L8'), where Ln = Gd3+, Tb3+, or Sm3+ (H3L' = salicylhydroxamic acid (H3shi), 5-methylsalicylhydroxamic acid (H3mshi), 5-methoxysalicylhydroxamic acid (H3moshi), and 3-hydroxy-2-naphthohydroxamic acid (H3nha)) and H2L″ = isophthalic acid (H2iph), was synthesized and characterized. Within the series, ligand-centered singlet state (S1) energy levels ranged from 23,300 to 27,800 cm-1, while triplet (T1) energy levels ranged from 18,150 to 21,980 cm-1. We demonstrated that the difference between T1 levels and relevant energies of the excited 4G5/2 level of Sm3+ (17,800 cm-1) and 5D4 level of Tb3+ (20,400 cm-1) is the major parameter controlling thermal dependence of the emission intensity via the back energy transfer mechanism. However, when the energy difference between S1 and T1 levels is small (below 3760 cm-1), the S1 → T1 intersystem crossing (and its reverse, S1 ← T1) mechanism contributes to the thermal behavior of metallacrowns. Both mechanisms affect Ln3+-centered room-temperature quantum yields with values ranging from 2.07(6)% to 31.2(2)% for Tb2L8' and from 0.0267(7)% to 2.27(5)% for Sm2L8'. The maximal thermal dependence varies over a wide thermal range (ca. 150-350 K) based on energy gaps between relevant ligand-based and lanthanide-based electronic states. By mixing Tb2moshi8' with Sm2moshi8' in a 1:1 ratio, an optical thermometer with a relative thermal sensitivity larger than 3%/K at 225 K was created. Other temperature ranges are also accessible with this approach.
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Affiliation(s)
- Elvin V Salerno
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Albano N Carneiro Neto
- Phantom-g, CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro Campus de Santiago, Aveiro 3810-193, Portugal
| | - Svetlana V Eliseeva
- Centre de Biophysique Moléculaire CNRS UPR 4301, 45071 Orléans Cedex 2, France
| | - Miguel A Hernández-Rodríguez
- Phantom-g, CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro Campus de Santiago, Aveiro 3810-193, Portugal
| | - Jacob C Lutter
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Timothée Lathion
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jeff W Kampf
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire CNRS UPR 4301, 45071 Orléans Cedex 2, France
| | - Luis D Carlos
- Phantom-g, CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro Campus de Santiago, Aveiro 3810-193, Portugal
| | - Vincent L Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
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Salerno EV, Foley CM, Marzaroli V, Schneider BL, Sharin MD, Kampf JW, Marchiò L, Zeller M, Guillot R, Mallah T, Tegoni M, Pecoraro VL, Zaleski CM. Unique Dimerization Topology and Countercation Binding Modes in 12‐Metallacrown‐4 Compounds. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200439] [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: 11/11/2022]
Affiliation(s)
- Elvin V. Salerno
- Department of Chemistry University of Michigan Ann Arbor Michigan 48109 United States
| | - Collin M. Foley
- Department of Chemistry and Biochemistry Shippensburg University Shippensburg Pennsylvania 17257 United States
| | - Vittoria Marzaroli
- Department of Chemistry Life Sciences, and Environmental Sustainability University of Parma Parco Area delle Scienze 11 A 43124 Parma Italy
| | | | - Max D. Sharin
- Department of Chemistry University of Michigan Ann Arbor Michigan 48109 United States
| | - Jeff W. Kampf
- Department of Chemistry University of Michigan Ann Arbor Michigan 48109 United States
| | - Luciano Marchiò
- Department of Chemistry Life Sciences, and Environmental Sustainability University of Parma Parco Area delle Scienze 11 A 43124 Parma Italy
| | - Matthias Zeller
- Department of Chemistry Purdue University West Lafayette Indiana 47907 United States
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay Université Paris Saclay ICMMO CNRS 8182 91405 Orsay, Cedex France
| | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d'Orsay Université Paris Saclay ICMMO CNRS 8182 91405 Orsay, Cedex France
| | - Matteo Tegoni
- Department of Chemistry Life Sciences, and Environmental Sustainability University of Parma Parco Area delle Scienze 11 A 43124 Parma Italy
| | - Vincent L. Pecoraro
- Department of Chemistry University of Michigan Ann Arbor Michigan 48109 United States
| | - Curtis M. Zaleski
- Department of Chemistry and Biochemistry Shippensburg University Shippensburg Pennsylvania 17257 United States
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Abstract
One of the hallmark advances in our understanding of metalloprotein function is showcased in our ability to design new, non-native, catalytically active protein scaffolds. This review highlights progress and milestone achievements in the field of de novo metalloprotein design focused on reports from the past decade with special emphasis on de novo designs couched within common subfields of bioinorganic study: heme binding proteins, monometal- and dimetal-containing catalytic sites, and metal-containing electron transfer sites. Within each subfield, we highlight several of what we have identified as significant and important contributions to either our understanding of that subfield or de novo metalloprotein design as a discipline. These reports are placed in context both historically and scientifically. General suggestions for future directions that we feel will be important to advance our understanding or accelerate discovery are discussed.
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Affiliation(s)
- Karl J. Koebke
- Department of Chemistry, University of Michigan Ann Arbor, MI 48109 USA
| | | | - Winston C. Pitts
- Department of Chemistry, University of Michigan Ann Arbor, MI 48109 USA
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Pinter TB, Ervin CS, Deb A, Penner-Hahn JE, Pecoraro VL. Cu(I) Binding to Designed Proteins Reveals a Putative Copper Binding Site of the Human Line1 Retrotransposon Protein ORF1p. Inorg Chem 2022; 61:5084-5091. [PMID: 35286080 PMCID: PMC10754372 DOI: 10.1021/acs.inorgchem.2c00057] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Long interspersed nuclear elements-1 (L1) are autonomous retrotransposons that encode two proteins in different open reading frames (ORF1 and ORF2). The ORF1p, which may be an RNA binding and chaperone protein, contains a three-stranded coiled coil (3SCC) domain that facilitates the formation of the biologically active homotrimer. This 3SCC domain is composed of seven amino acid (heptad) repeats as found in native and designed peptides and a stammer that modifies the helical structure. Cysteine residues occur at three hydrophobic positions (2 a and 1 d sites) within this domain. We recently showed that the cysteine layers in ORF1p and model de novo designed peptides bind the toxic metalloid lead(II) with high affinities, a feature that had not been previously recognized. However, there is little understanding of how essential metal ions might interact with this metal binding domain. We have, therefore, investigated the copper(I) binding properties of analogous de novo designed 3SCCs that contain cysteine layers within the hydrophobic core. The results from UV-visible and X-ray absorption spectroscopy show that these designed peptides bind Cu(I) with high affinity in a pH-dependent manner. At pH 9, monomeric trigonal planar Cu(I)S3 centers are formed with 1 equiv of metal, while dinuclear centers form with a second equivalent of metal. At physiologic pH conditions, the dinuclear center forms cooperatively. These data suggest that ORF1p is capable of binding two copper ions to its tris(cysteine) layers. This has major implications for ORF1p coiled coil domain stability and dynamics, ultimately potentially impacting the resulting biological activity.
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Affiliation(s)
- Tyler B.J. Pinter
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
- These authors contributed equally to this work
| | - Catherine S. Ervin
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
- These authors contributed equally to this work
| | - Aniruddha Deb
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
- Program in Biophysics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - James E. Penner-Hahn
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
- Program in Biophysics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Vincent L. Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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Eliseeva SV, Nguyen TN, Kampf JW, Trivedi ER, Pecoraro VL, Petoud S. Tuning the photophysical properties of lanthanide(iii)/zinc(ii) ‘encapsulated sandwich’ metallacrowns emitting in the near-infrared range. Chem Sci 2022; 13:2919-2931. [PMID: 35382470 PMCID: PMC8905956 DOI: 10.1039/d1sc06769a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 01/22/2022] [Indexed: 11/21/2022] Open
Abstract
A family of Zn16Ln(HA)16 metallacrowns (MCs; Ln = YbIII, ErIII, and NdIII; HA = picoline- (picHA2−), pyrazine- (pyzHA2−), and quinaldine- (quinHA2−) hydroximates) with an ‘encapsulated sandwich’ structure possesses outstanding luminescence properties in the near-infrared (NIR) and suitability for cell imaging. Here, to decipher which parameters affect their functional and photophysical properties and how the nature of the hydroximate ligands can allow their fine tuning, we have completed this Zn16Ln(HA)16 family by synthesizing MCs with two new ligands, naphthyridine- (napHA2−) and quinoxaline- (quinoHA2−) hydroximates. Zn16Ln(napHA)16 and Zn16Ln(quinoHA)16 exhibit absorption bands extended into the visible range and efficiently sensitize the NIR emissions of YbIII, ErIII, and NdIII upon excitation up to 630 nm. The energies of the lowest singlet (S1), triplet (T1) and intra-ligand charge transfer (ILCT) states have been determined. LnIII-centered total (QLLn) and intrinsic (QLnLn) quantum yields, sensitization efficiencies (ηsens), observed (τobs) and radiative (τrad) luminescence lifetimes have been recorded and analyzed in the solid state and in CH3OH and CD3OD solutions for all Zn16Ln(HA)16. We found that, within the Zn16Ln(HA)16 family, τrad values are not constant for a particular LnIII. The close in energy positions of T1 and ILCT states in Zn16Ln(picHA)16 and Zn16Ln(quinHA)16 are preferred for the sensitization of LnIII NIR emission and ηsens values reach 100% for NdIII. Finally, the highest values of QLLn are observed for Zn16Ln(quinHA)16 in the solid state or in CD3OD solutions. With these data at hand, we are now capable of creating MCs with desired properties suitable for NIR optical imaging. We have created a family of ‘encapsulated sandwich’ Zn16Ln(HA)16 metallacrowns and by detailed quantitative analysis demonstrated how the nature of the hydroximate ligand impacts photophysical properties of these complexes.![]()
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Affiliation(s)
- Svetlana V. Eliseeva
- Centre de Biophysique Moléculaire, CNRS UPR 4301, F-45071 Orléans, Cedex 2, France
| | - Tu N. Nguyen
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Jeff W. Kampf
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Evan R. Trivedi
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Vincent L. Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire, CNRS UPR 4301, F-45071 Orléans, Cedex 2, France
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10
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Sgarlata C, Schneider BL, Zito V, Migliore R, Tegoni M, Pecoraro VL, Arena G. Lanthanide Identity Governs Guest-Induced Dimerization in Ln III [15-MC Cu II N(L-pheHA) -5]) 3+ Metallacrowns. Chemistry 2021; 27:17669-17675. [PMID: 34637566 DOI: 10.1002/chem.202103263] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 09/08/2021] [Indexed: 11/09/2022]
Abstract
Series of lanthanide-containing metallic coordination complexes are frequently presented as structurally analogous, due to the similar chemical and coordinative properties of the lanthanides. In the case of chiral (LnIII [15-MC Cu II N(L-pheHA) -5])3+ metallacrowns (MCs), which are well established supramolecular hosts, the formation of dimers templated by a dicarboxylate guest (muconate) in solution of neutral pH is herein shown to have a unique dependence on the identity of the MC's central lanthanide. Calorimetric data and nuclear magnetic resonance diffusion studies demonstrate that MCs containing larger or smaller lanthanides as the central metal only form monomeric host-guest complexes whereas analogues with intermediate lanthanides (for example, Eu, Gd, Dy) participate in formation of dimeric host-guest-host compartments. The driving force for the dimerization event across the series is thought to be a competition between formation of highly stable MCs (larger lanthanides) and optimally linked bridging guests (smaller lanthanides).
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Affiliation(s)
- Carmelo Sgarlata
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale Andrea Doria 6, 95125, Catania, Italy
| | | | - Valeria Zito
- Institute of Crystallography, National Research Council (CNR), S.S. Catania, Via P. Gaifami 18, 95126, Catania, Italy
| | - Rossella Migliore
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale Andrea Doria 6, 95125, Catania, Italy
| | - Matteo Tegoni
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17 A, 43124, Parma, Italy
| | - Vincent L Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Giuseppe Arena
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale Andrea Doria 6, 95125, Catania, Italy
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11
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Pinter TBJ, Ruckthong L, Stuckey JA, Deb A, Penner-Hahn JE, Pecoraro VL. Open Reading Frame 1 Protein of the Human Long Interspersed Nuclear Element 1 Retrotransposon Binds Multiple Equivalents of Lead. J Am Chem Soc 2021; 143:15271-15278. [PMID: 34494819 PMCID: PMC11069406 DOI: 10.1021/jacs.1c06461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The human long interspersed nuclear element 1 (LINE1) has been implicated in numerous diseases and has been suggested to play a significant role in genetic evolution. Open reading frame 1 protein (ORF1p) is one of the two proteins encoded in this self-replicating mobile genetic element, both of which are essential for retrotransposition. The structure of the three-stranded coiled-coil domain of ORF1p was recently solved and showed the presence of tris-cysteine layers in the interior of the coiled-coil that could function as metal binding sites. Here, we demonstrate that ORF1p binds Pb(II). We designed a model peptide, GRCSL16CL23C, to mimic two of the ORF1p Cys3 layers and crystallized the peptide both as the apo-form and in the presence of Pb(II). Structural comparison of the ORF1p with apo-(GRCSL16CL23C)3 shows very similar Cys3 layers, preorganized for Pb(II) binding. We propose that exposure to heavy metals, such as lead, could influence directly the structural parameters of ORF1p and thus impact the overall LINE1 retrotransposition frequency, directly relating heavy metal exposure to genetic modification.
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Affiliation(s)
- Tyler B. J. Pinter
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, United States
| | - Leela Ruckthong
- Department of Chemistry, Faculty of Science, King Mongkut’s University of Technology Thonburi (KMUTT), Bang Mod, Thung Khru, Bangkok, 10140, Thailand
| | - Jeanne A. Stuckey
- Life Sciences Institute, University of Michigan, Ann Arbor, 48109, United States
| | - Aniruddha Deb
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, United States
| | - James E. Penner-Hahn
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, United States
- Program in Biophysics, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Vincent L. Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, United States
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12
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Koebke KJ, Tebo AG, Manickas EC, Deb A, Penner-Hahn JE, Pecoraro VL. Nitrite reductase activity within an antiparallel de novo scaffold. J Biol Inorg Chem 2021; 26:855-862. [PMID: 34487215 DOI: 10.1007/s00775-021-01889-1] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 07/26/2021] [Indexed: 12/28/2022]
Abstract
Copper nitrite reductase (CuNiR) is a copper enzyme that converts nitrite to nitric oxide and is an important part of the global nitrogen cycle in bacteria. The relatively simple CuHis3 binding site of the CuNiR active site has made it an enticing target for small molecule modeling and de novo protein design studies. We have previously reported symmetric CuNiR models within parallel three stranded coiled coil systems, with activities that span a range of three orders of magnitude. In this report, we investigate the same CuHis3 binding site within an antiparallel three helical bundle scaffold, which allows the design of asymmetric constructs. We determine that a simple CuHis3 binding site can be designed within this scaffold with enhanced activity relative to the comparable construct in parallel coiled coils. Incorporating more complex designs or repositioning this binding site can decrease this activity as much as 15 times. Comparing these constructs, we reaffirm a previous result in which a blue shift in the 1s to 4p transition energy determined by Cu(I) X-ray absorption spectroscopy is correlated with an enhanced activity within imidazole-based constructs. With this step and recent successful electron transfer site designs within this scaffold, we are one step closer to a fully functional de novo designed nitrite reductase.
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Affiliation(s)
- Karl J Koebke
- Department of Chemistry, University of Michigan, Ann Arbor, MI, USA
| | - Alison G Tebo
- Program in Chemical Biology, University of Michigan, Ann Arbor, MI, USA.,Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA, USA
| | | | - Aniruddha Deb
- Department of Chemistry, University of Michigan, Ann Arbor, MI, USA
| | - James E Penner-Hahn
- Department of Chemistry, University of Michigan, Ann Arbor, MI, USA.,Department of Biophysics, University of Michigan, Ann Arbor, MI, USA
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13
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Lutter JC, Boron TT, Chadwick KE, Davis AH, Kleinhaus S, Kampf JW, Zaleski CM, Pecoraro VL. Identification of slow magnetic relaxation and magnetocoolant capabilities of heterobimetallic lanthanide-manganese metallacrown-like compounds. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115190] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Tebo A, Quaranta A, Pecoraro VL, Aukauloo A. Enhanced Photoinduced Electron Transfer Through a Tyrosine Relay in a De Novo Designed Protein Scaffold Bearing a Photoredox Unit and a Fe
II
S
4
Site. CHEMPHOTOCHEM 2021. [DOI: 10.1002/cptc.202100014] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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)
- Alison Tebo
- Program in Chemical Biology University of Michigan Ann Arbor USA
- Department of Chemistry University of Michigan Ann Arbor USA
| | - Annamaria Quaranta
- Institut de Biologie Integrative de la cellule CEA Université Paris-Saclay Gif-sur-Yvette France
| | | | - Ally Aukauloo
- Institut de Biologie Integrative de la cellule CEA Université Paris-Saclay Gif-sur-Yvette France
- Institut de Chimie Moléculaire et des Matériaux d'Orsay Université Paris-Saclay Orsay France
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15
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Salerno EV, Kampf JW, Pecoraro VL, Mallah T. Magnetic properties of two Gd IIIFe III4 metallacrowns and strategies for optimizing the magnetocaloric effect of this topology. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00207d] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Two Gd3+ [12-MCFeIII(N)shi-4] metallacrowns are analyzed for magnetic properties, and calculations concerning the magnetic exchange parameters of this topology are considered.
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Affiliation(s)
- Elvin V. Salerno
- Department of Chemistry
- Willard H. Dow Laboratories
- University of Michigan
- Ann Arbor
- USA
| | - Jeff W. Kampf
- Department of Chemistry
- Willard H. Dow Laboratories
- University of Michigan
- Ann Arbor
- USA
| | - Vincent L. Pecoraro
- Department of Chemistry
- Willard H. Dow Laboratories
- University of Michigan
- Ann Arbor
- USA
| | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d'Orsay
- CNRS
- Université Paris-Saclay
- 91405 Orsay Cedex
- France
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16
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Koebke KJ, Kühl T, Lojou E, Demeler B, Schoepp-Cothenet B, Iranzo O, Pecoraro VL, Ivancich A. The pH-Induced Selectivity Between Cysteine or Histidine Coordinated Heme in an Artificial α-Helical Metalloprotein. Angew Chem Int Ed Engl 2020; 60:3974-3978. [PMID: 33215801 DOI: 10.1002/anie.202012673] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 09/17/2020] [Revised: 11/19/2020] [Indexed: 11/09/2022]
Abstract
De Novo metalloprotein design assesses the relationship between metal active site architecture and catalytic reactivity. Herein, we use an α-helical scaffold to control the iron coordination geometry when a heme cofactor is allowed to bind to either histidine or cysteine ligands, within a single artificial protein. Consequently, we uncovered a reversible pH-induced switch of the heme axial ligation within this simplified scaffold. Characterization of the specific heme coordination modes was done by using UV/Vis and Electron Paramagnetic Resonance spectroscopies. The penta- or hexa-coordinate thiolate heme (9≤pH≤11) and the penta-coordinate imidazole heme (6≤pH≤8.5) reproduces well the heme ligation in chloroperoxidases or cyt P450 monooxygenases and peroxidases, respectively. The stability of heme coordination upon ferric/ferrous redox cycling is a crucial property of the construct. At basic pHs, the thiolate mini-heme protein can catalyze O2 reduction when adsorbed onto a pyrolytic graphite electrode.
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Affiliation(s)
- Karl J Koebke
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Toni Kühl
- Laboratoire de Bioénergétique et Ingénierie des Protéines (UMR 7281), IMM FR3479, CNRS, Aix-Marseille Univ., Marseille, France
| | - Elisabeth Lojou
- Laboratoire de Bioénergétique et Ingénierie des Protéines (UMR 7281), IMM FR3479, CNRS, Aix-Marseille Univ., Marseille, France
| | - Borries Demeler
- Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada
| | - Barbara Schoepp-Cothenet
- Laboratoire de Bioénergétique et Ingénierie des Protéines (UMR 7281), IMM FR3479, CNRS, Aix-Marseille Univ., Marseille, France
| | - Olga Iranzo
- Institut des Sciences Moléculaires de Marseille (iSm2), Centrale Marseille, Aix-Marseille Univ., CNRS, Marseille, France
| | - Vincent L Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Anabella Ivancich
- Laboratoire de Bioénergétique et Ingénierie des Protéines (UMR 7281), IMM FR3479, CNRS, Aix-Marseille Univ., Marseille, France
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17
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Koebke KJ, Kühl T, Lojou E, Demeler B, Schoepp‐Cothenet B, Iranzo O, Pecoraro VL, Ivancich A. The pH‐Induced Selectivity Between Cysteine or Histidine Coordinated Heme in an Artificial α‐Helical Metalloprotein. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202012673] [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: 12/31/2022]
Affiliation(s)
- Karl J. Koebke
- Department of Chemistry University of Michigan Ann Arbor MI 48109 USA
| | - Toni Kühl
- Laboratoire de Bioénergétique et Ingénierie des Protéines (UMR 7281), IMM FR3479, CNRS Aix-Marseille Univ. Marseille France
| | - Elisabeth Lojou
- Laboratoire de Bioénergétique et Ingénierie des Protéines (UMR 7281), IMM FR3479, CNRS Aix-Marseille Univ. Marseille France
| | - Borries Demeler
- Department of Chemistry and Biochemistry University of Lethbridge Lethbridge AB T1K 3M4 Canada
| | - Barbara Schoepp‐Cothenet
- Laboratoire de Bioénergétique et Ingénierie des Protéines (UMR 7281), IMM FR3479, CNRS Aix-Marseille Univ. Marseille France
| | - Olga Iranzo
- Institut des Sciences Moléculaires de Marseille (iSm2) Centrale Marseille Aix-Marseille Univ. CNRS Marseille France
| | | | - Anabella Ivancich
- Laboratoire de Bioénergétique et Ingénierie des Protéines (UMR 7281), IMM FR3479, CNRS Aix-Marseille Univ. Marseille France
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18
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Salerno EV, Eliseeva SV, Schneider BL, Kampf JW, Petoud S, Pecoraro VL. Visible, Near-Infrared, and Dual-Range Luminescence Spanning the 4f Series Sensitized by a Gallium(III)/Lanthanide(III) Metallacrown Structure. J Phys Chem A 2020; 124:10550-10564. [DOI: 10.1021/acs.jpca.0c08819] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Elvin V. Salerno
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Svetlana V. Eliseeva
- Centre de Biophysique Moléculaire, CNRS UPR 4301, F-45071, Orleans Cedex 2, France
| | - Bernadette L. Schneider
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jeff W. Kampf
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire, CNRS UPR 4301, F-45071, Orleans Cedex 2, France
| | - Vincent L. Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
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19
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Pinter TBJ, Manickas EC, Tolbert AE, Koebke KJ, Deb A, Penner-Hahn JE, Pecoraro VL. Making or Breaking Metal-Dependent Catalytic Activity: The Role of Stammers in Designed Three-Stranded Coiled Coils. Angew Chem Int Ed Engl 2020; 59:20445-20449. [PMID: 32748510 PMCID: PMC7722090 DOI: 10.1002/anie.202008356] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 07/21/2020] [Indexed: 12/31/2022]
Abstract
While many life-critical reactions would be infeasibly slow without metal cofactors, a detailed understanding of how protein structure can influence catalytic activity remains elusive. Using de novo designed three-stranded coiled coils (TRI and Grand peptides formed using a heptad repeat approach), we examine how the insertion of a three residue discontinuity, known as a stammer insert, directly adjacent to a (His)3 metal binding site alters catalytic activity. The stammer, which locally alters the twist of the helix, significantly increases copper-catalyzed nitrite reductase activity (CuNiR). In contrast, the well-established zinc-catalyzed carbonic anhydrase activity (p-nitrophenyl acetate, pNPA) is effectively ablated. This study illustrates how the perturbation of the protein sequence using non-coordinating and non-acid base residues in the helical core can perturb metalloenzyme activity through the simple expedient of modifying the helical pitch adjacent to the catalytic center.
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Affiliation(s)
- Tyler B. J. Pinter
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, USA, 48109
| | | | - Audrey E. Tolbert
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, USA, 48109
| | - Karl J. Koebke
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, USA, 48109
| | - Aniruddha Deb
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, USA, 48109
| | - James E. Penner-Hahn
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, USA, 48109
| | - Vincent L. Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, USA, 48109
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20
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Pinter TBJ, Manickas EC, Tolbert AE, Koebke KJ, Deb A, Penner‐Hahn JE, Pecoraro VL. Making or Breaking Metal‐Dependent Catalytic Activity: The Role of Stammers in Designed Three‐Stranded Coiled Coils. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008356] [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: 11/09/2022]
Affiliation(s)
| | | | - Audrey E. Tolbert
- Department of Chemistry University of Michigan Ann Arbor MI 48109 USA
| | - Karl J. Koebke
- Department of Chemistry University of Michigan Ann Arbor MI 48109 USA
| | - Aniruddha Deb
- Department of Chemistry University of Michigan Ann Arbor MI 48109 USA
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21
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Salerno EV, Zeler J, Eliseeva SV, Hernández-Rodríguez MA, Carneiro Neto AN, Petoud S, Pecoraro VL, Carlos LD. [Ga 3+ 8 Sm 3+ 2 , Ga 3+ 8 Tb 3+ 2 ] Metallacrowns are Highly Promising Ratiometric Luminescent Molecular Nanothermometers Operating at Physiologically Relevant Temperatures. Chemistry 2020; 26:13792-13796. [PMID: 32663350 DOI: 10.1002/chem.202003239] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Indexed: 12/13/2022]
Abstract
Nanothermometry is the study of temperature at the submicron scale with a broad range of potential applications, such as cellular studies or electronics. Molecular luminescent-based nanothermometers offer a non-contact means to record these temperatures with high spatial resolution and thermal sensitivity. A luminescent-based molecular thermometer comprised of visible-emitting Ga3+ /Tb3+ and Ga3+ /Sm3+ metallacrowns (MCs) achieved remarkable relative thermal sensitivity associated with very low temperature uncertainty of Sr =1.9 % K-1 and δT<0.045 K, respectively, at 328 K, as an aqueous suspension of polystyrene nanobeads loaded with the corresponding MCs. To date, they are the ratiometric molecular nanothermometers offering the highest level of sensitivity in the physiologically relevant temperature range.
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Affiliation(s)
- Elvin V Salerno
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48108, USA
| | - Justyna Zeler
- Phantom-g, CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro, Campus de Santiago, Aveiro, Portugal.,Faculty of Chemistry, University of Wroclaw, Wroclaw, Poland
| | - Svetlana V Eliseeva
- Centre de Biophysique Moléculaire, CNRS, UPR 4301, 45071, Orléans Cedex 2, France
| | - Miguel A Hernández-Rodríguez
- Phantom-g, CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro, Campus de Santiago, Aveiro, Portugal
| | - Albano N Carneiro Neto
- Phantom-g, CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro, Campus de Santiago, Aveiro, Portugal
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire, CNRS, UPR 4301, 45071, Orléans Cedex 2, France
| | - Vincent L Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48108, USA
| | - Luís D Carlos
- Phantom-g, CICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro, Campus de Santiago, Aveiro, Portugal
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22
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Eliseeva SV, Salerno EV, Lopez Bermudez BA, Petoud S, Pecoraro VL. Dy3+ White Light Emission Can Be Finely Controlled by Tuning the First Coordination Sphere of Ga3+/Dy3+ Metallacrown Complexes. J Am Chem Soc 2020; 142:16173-16176. [DOI: 10.1021/jacs.0c07198] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Svetlana V. Eliseeva
- Centre de Biophysique Moléculaire, CNRS UPR 4301, F-45071 Orléans, Cedex 2, France
| | - Elvin V. Salerno
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Beatriz A. Lopez Bermudez
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire, CNRS UPR 4301, F-45071 Orléans, Cedex 2, France
| | - Vincent L. Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
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23
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Koebke KJ, Alfaro VS, Pinter TBJ, Deb A, Lehnert N, Tard C, Penner-Hahn JE, Pecoraro VL. Traversing the Red-Green-Blue Color Spectrum in Rationally Designed Cupredoxins. J Am Chem Soc 2020; 142:15282-15294. [PMID: 32786767 DOI: 10.1021/jacs.0c04757] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Blue copper proteins have a constrained Cu(II) geometry that has proven difficult to recapitulate outside native cupredoxin folds. Previous work has successfully designed green copper proteins which could be tuned blue using exogenous ligands, but the question of how one can create a self-contained blue copper site within a de novo scaffold, especially one removed from a cupredoxin fold, remained. We have recently reported a red copper protein site within a three helical bundle scaffold which we later revisited and determined to be a nitrosocyanin mimic, with a CuHis2CysGlu binding site. We now report efforts to rationally design this construct toward either green or blue copper chromophores using mutation strategies that have proven successful in native cupredoxins. By rotating the metal binding site, we created a de novo green copper protein. This in turn was converted to a blue copper protein by removing an axial methionine. Following this rational sequence, we have successfully created red, green, and blue copper proteins within an alpha helical fold, enabling comparisons for the first time of their structure and function disconnected from the overall cupredoxin fold.
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Affiliation(s)
- Karl J Koebke
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Victor Sosa Alfaro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Tyler B J Pinter
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Aniruddha Deb
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Nicolai Lehnert
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Cédric Tard
- LCM, CNRS, Ecole Polytechnique, IP Paris, F-91128 Palaiseau, France
| | - James E Penner-Hahn
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Vincent L Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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24
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Abstract
The relationship between protein structure and function is one of the greatest puzzles within biochemistry. De novo metalloprotein design is a way to wipe the board clean and determine what is required to build in function from the ground up in an unrelated structure. This Review focuses on protein design efforts to create de novo metalloproteins within alpha-helical scaffolds. Examples of successful designs include those with carbonic anhydrase or nitrite reductase activity by incorporating a ZnHis3 or CuHis3 site, or that recapitulate the spectroscopic properties of unique electron-transfer sites in cupredoxins (CuHis2 Cys) or rubredoxins (FeCys4 ). This work showcases the versatility of alpha helices as scaffolds for metalloprotein design and the progress that is possible through careful rational design. Our studies cover the invariance of carbonic anhydrase activity with different site positions and scaffolds, refinement of our cupredoxin models, and enhancement of nitrite reductase activity up to 1000-fold.
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Affiliation(s)
- Tyler B. J. Pinter
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, United States, 48109-1055
| | - Karl J. Koebke
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, United States, 48109-1055
| | - Vincent L. Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, United States, 48109-1055
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25
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Affiliation(s)
- Tyler B. J. Pinter
- Department of Chemistry University of Michigan Ann Arbor Michigan 48109-1055 USA
| | - Karl J. Koebke
- Department of Chemistry University of Michigan Ann Arbor Michigan 48109-1055 USA
| | - Vincent L. Pecoraro
- Department of Chemistry University of Michigan Ann Arbor Michigan 48109-1055 USA
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26
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Tolbert AE, Ervin CS, Ruckthong L, Paul TJ, Jayasinghe-Arachchige VM, Neupane KP, Stuckey JA, Prabhakar R, Pecoraro VL. Heteromeric three-stranded coiled coils designed using a Pb(II)(Cys) 3 template mediated strategy. Nat Chem 2020; 12:405-411. [PMID: 32123337 DOI: 10.1038/s41557-020-0423-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 01/19/2020] [Indexed: 11/09/2022]
Abstract
Three-stranded coiled coils are peptide structures constructed from amphipathic heptad repeats. Here we show that it is possible to form pure heterotrimeric three-stranded coiled coils by combining three distinct characteristics: (1) a cysteine sulfur layer for metal coordination, (2) a thiophilic, trigonal pyramidal metalloid (Pb(II)) that binds to these sulfurs and (3) an adjacent layer of reduced steric bulk generating a cavity where water can hydrogen bond to the cysteine sulfur atoms. Cysteine substitution in an a site yields Pb(II)A2B heterotrimers, while d sites provide pure Pb(II)C2D or Pb(II)CD2 scaffolds. Altering the metal from Pb(II) to Hg(II) or shifting the relative position of the sterically less demanding layer removes heterotrimer specificity. Because only two of the eight or ten hydrophobic layers are perturbed, catalytic sites can be introduced at other regions of the scaffold. A Zn(II)(histidine)3(H2O) centre can be incorporated at a remote location without perturbing the heterotrimer selectivity, suggesting a unique strategy to prepare dissymmetric catalytic sites within self-assembling de novo-designed proteins.
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Affiliation(s)
- Audrey E Tolbert
- Department of Chemistry, University of Michigan, Ann Arbor, MI, USA
| | | | - Leela Ruckthong
- Department of Chemistry, Faculty of Science, King Mongkut's University of Technology, Thonburi (KMUTT), Bangkok, Thailand
| | - Thomas J Paul
- Department of Chemistry, University of Miami, Coral Gables, FL, USA
| | | | - Kosh P Neupane
- Department of Chemistry, University of Michigan, Ann Arbor, MI, USA
| | - Jeanne A Stuckey
- Life Sciences Institute, University of Michigan, Ann Arbor, MI, USA
| | - Rajeev Prabhakar
- Department of Chemistry, University of Miami, Coral Gables, FL, USA
| | - Vincent L Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, MI, USA. .,Department of Biophysics, University of Michigan, Ann Arbor, MI, USA.
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27
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Lutter JC, Eliseeva SV, Collet G, Martinić I, Kampf JW, Schneider BL, Carichner A, Sobilo J, Lerondel S, Petoud S, Pecoraro VL. Iodinated Metallacrowns: Toward Combined Bimodal Near‐Infrared and X‐Ray Contrast Imaging Agents. Chemistry 2020; 26:1274-1277. [DOI: 10.1002/chem.201905241] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Indexed: 12/21/2022]
Affiliation(s)
- Jacob C. Lutter
- Department of ChemistryWillard H. Dow LaboratoriesThe University of Michigan Ann Arbor MI 48109 United States
| | | | - Guillaume Collet
- Centre de Biophysique MoléculaireCNRS UPR 4301 45071 Orléans Cedex 2 France
| | - Ivana Martinić
- Centre de Biophysique MoléculaireCNRS UPR 4301 45071 Orléans Cedex 2 France
| | - Jeff W. Kampf
- Department of ChemistryWillard H. Dow LaboratoriesThe University of Michigan Ann Arbor MI 48109 United States
| | - Bernadette L. Schneider
- Department of ChemistryWillard H. Dow LaboratoriesThe University of Michigan Ann Arbor MI 48109 United States
| | - Aidan Carichner
- Department of ChemistryWillard H. Dow LaboratoriesThe University of Michigan Ann Arbor MI 48109 United States
| | - Julien Sobilo
- Centre d'Imagerie du Petit AnimalPHENOMIN-TAAM 45071 Orléans Cedex 2 France
| | - Stéphanie Lerondel
- Centre d'Imagerie du Petit AnimalPHENOMIN-TAAM 45071 Orléans Cedex 2 France
| | - Stéphane Petoud
- Centre de Biophysique MoléculaireCNRS UPR 4301 45071 Orléans Cedex 2 France
| | - Vincent L. Pecoraro
- Department of ChemistryWillard H. Dow LaboratoriesThe University of Michigan Ann Arbor MI 48109 United States
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28
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Nguyen TN, Eliseeva SV, Chow CY, Kampf JW, Petoud S, Pecoraro VL. Peculiarities of crystal structures and photophysical properties of GaIII/LnIII metallacrowns with a non-planar [12-MC-4] core. Inorg Chem Front 2020. [DOI: 10.1039/c9qi01647c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The direct synthetic approach can be used to create a series of visible and near-infrared emitting GaIII/LnIII metallacrowns with a non-planar [12-MC-4] core.
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Affiliation(s)
- Tu N. Nguyen
- Department of Chemistry
- Willard H. Dow Laboratories
- University of Michigan
- Ann Arbor
- USA
| | | | - Chun Y. Chow
- Department of Chemistry
- Willard H. Dow Laboratories
- University of Michigan
- Ann Arbor
- USA
| | - Jeff W. Kampf
- Department of Chemistry
- Willard H. Dow Laboratories
- University of Michigan
- Ann Arbor
- USA
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire
- CNRS UPR 4301
- F-45071 Orléans Cedex 2
- France
| | - Vincent L. Pecoraro
- Department of Chemistry
- Willard H. Dow Laboratories
- University of Michigan
- Ann Arbor
- USA
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29
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Ostrowska M, Toporivska Y, Golenya IA, Shova S, Fritsky IO, Pecoraro VL, Gumienna-Kontecka E. Explaining How α-Hydroxamate Ligands Control the Formation of Cu(II)-, Ni(II)-, and Zn(II)-Containing Metallacrowns. Inorg Chem 2019; 58:16642-16659. [DOI: 10.1021/acs.inorgchem.9b02724] [Citation(s) in RCA: 9] [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: 12/31/2022]
Affiliation(s)
| | | | - Irina A. Golenya
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska Str., 01601 Kiev, Ukraine
| | - Sergiu Shova
- “Poni Petru” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Igor O. Fritsky
- Department of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska Str., 01601 Kiev, Ukraine
| | - Vincent L. Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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30
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Jung J, Islam MA, Pecoraro VL, Mallah T, Berthon C, Bolvin H. Derivation of Lanthanide Series Crystal Field Parameters From First Principles. Chemistry 2019; 25:15112-15122. [PMID: 31496013 DOI: 10.1002/chem.201903141] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [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: 07/10/2019] [Revised: 08/28/2019] [Indexed: 11/08/2022]
Abstract
Two series of lanthanide complexes have been chosen to analyze trends in the magnetic properties and crystal field parameters (CFPs) along the two series: The highly symmetric LnZn16 (picHA)16 series (Ln=Tb, Dy, Ho, Er, Yb; picHA=picolinohydroxamic acid) and the [Ln(dpa)3 ](C3 H5 N2 )3 ⋅3H2 O series (Ln=Ce-Yb; dpa=2,6-dipicolinic acid) with approximate three-fold symmetry. The first series presents a compressed coordination sphere of eight oxygen atoms whereas in the second series, the coordination sphere consists of an elongated coordination sphere formed of six oxygen atoms. The CFPs have been deduced from ab initio calculations using two methods: The AILFT (ab initio ligand field theory) method, in which the parameters are determined at the orbital level, and the ITO (irreducible tensor operator) decomposition, in which the problems are treated at the many-electron level. It has been found that the CFPs are transferable from one derivative to another, within a given series, as a first approximation. The sign of the second-order parameter B 0 2 differs in the two series, reflecting the different environments. It has been found that the use of the strength parameter S allows for an easy comparison between complexes. Furthermore, in both series, the parameters have been found to decrease in magnitude along the series, and this decrease is attributed to covalent effects.
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Affiliation(s)
- Julie Jung
- Theoretical division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA
| | - M Ashraful Islam
- Laboratoire de Chimie et Physique Quantiques, CNRS, Université Toulouse III, 118 route de Narbonne, 31062, Toulouse, France
| | - Vincent L Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan, 48109, USA
| | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS, Université de Paris-Sud 11, 91405, Orsay Cedex, France
| | - Claude Berthon
- CEA, Nuclear Energy Division, Radiochemistry Processes Department, DRCP, BP 17171, 30207, Bagnols sur Cèze, France
| | - Hélène Bolvin
- Laboratoire de Chimie et Physique Quantiques, CNRS, Université Toulouse III, 118 route de Narbonne, 31062, Toulouse, France
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31
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Abstract
The relationship between structure and function has long been one of the major points of investigation in Biophysics. Understanding how much, or how little, of a protein's often complicated structure is necessary for its function can lead to directed therapeutic strategies and would allow one to design proteins for specific desired functions. Studying protein function by de novo design builds the functionality from the ground up in a completely unrelated and noncoded protein scaffold. Our lab has used this strategy to study heavy and transition metal binding within the TRI family of three stranded coiled coil (3SCC) constructs to understand coordination geometry and metalloenzyme catalytic control within a protein environment. These peptides contain hydrophobic layers within the interior of the 3SCC, which one can mutate to metal binding residues to create a minimal metal binding site, while solid phase synthesis allows our lab to easily incorporate a number of noncoded amino acids including d enantiomers of binding or secondary coordination sphere amino acids, penicillamine, or methylated versions of histidine. Our studies of Cd(II) binding to Cys3 environments have determined, largely through the use of 113Cd NMR and 111mCd PAC, that the coordination environment around a heavy metal can be controlled by incorporating noncoded amino acids in either the primary or secondary coordination spheres. We found mutating the metal binding amino acids to l-Pen can enforce trigonal Cd(II)S3 geometry exclusively compared to the mixed coordination determined for l-Cys coordination. The same result can be achieved with secondary sphere mutations as well by incorporating d-Leu above a Cys3. We hypothesize this latter effect is due to the increased steric packing above the metal binding site that occurs when the l-Leu oriented toward the N-terminus of the scaffold is mutated to d-Leu and oriented toward the C-terminus. Mutating the layer below Cys3 to d-Leu instead formed a mixed 4- and 5-coordinate Cd(II)S3(H2O) and Cd(II)S3(H2O)2 construct as steric bulk was decreased below the metal binding site. We have also applied noncoded amino acids to metalloenzyme systems by incorporating His residues that are methylated at the δ- or ε-nitrogen to enforce Cu(I) ligation to the opposite open nitrogen of His and found a 2 orders of magnitude increased catalytic efficiency for nitrite reductase activity with ε-nitrogen coordination compared to δ-nitrogen. These results exemplify the ability to tune coordination environment and catalytic efficiency within a de novo scaffold as well as the utility of noncoded amino acids to increase the chemist's toolbox. By furthering our understanding of metalloprotein design one could envision, through our use of amino acids not normally available to nature, that protein design laboratories will soon be capable of outperforming the native systems previously used as their benchmark of successful design. The ability to design proteins at this level would have far reaching and exciting benefits within various fields including medical and industrial applications.
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Affiliation(s)
- Karl J. Koebke
- Department of Chemistry, University of Michigan Ann Arbor, Michigan 48109, United States
| | - Vincent L. Pecoraro
- Department of Chemistry, University of Michigan Ann Arbor, Michigan 48109, United States
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32
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Koebke KJ, Yu F, Van Stappen C, Pinter TBJ, Deb A, Penner-Hahn JE, Pecoraro VL. Methylated Histidines Alter Tautomeric Preferences that Influence the Rates of Cu Nitrite Reductase Catalysis in Designed Peptides. J Am Chem Soc 2019; 141:7765-7775. [PMID: 30983335 PMCID: PMC6824201 DOI: 10.1021/jacs.9b00196] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Copper proteins have the capacity to serve as both redox active catalysts and purely electron transfer centers. A longstanding question in this field is how the function of histidine ligated Cu centers are modulated by δ vs ε-nitrogen ligation of the imidazole. Evaluating the impact of these coordination modes on structure and function by comparative analysis of deposited crystal structures is confounded by factors such as differing protein folds and disparate secondary coordination spheres that make direct comparison of these isomers difficult. Here, we present a series of de novo designed proteins using the noncanonical amino acids 1-methyl-histidine and 3-methyl-histidine to create Cu nitrite reductases where δ- or ε-nitrogen ligation is enforced by the opposite nitrogen's methylation as a means of directly comparing these two ligation states in the same protein fold. We find that ε-nitrogen ligation allows for a better nitrite reduction catalyst, displaying 2 orders of magnitude higher activity than the δ-nitrogen ligated construct. Methylation of the δ nitrogen, combined with a secondary sphere mutation we have previously published, has produced a new record for efficiency within a homogeneous aqueous system, improving by 1 order of magnitude the previously published most efficient construct. Furthermore, we have measured Michaelis-Menten kinetics on these highly active constructs, revealing that the remaining barriers to matching the catalytic efficiency ( kcat/ KM) of native Cu nitrite reductase involve both substrate binding ( KM) and catalysis ( kcat).
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Affiliation(s)
- Karl J. Koebke
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Fangting Yu
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Casey Van Stappen
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Tyler B. J. Pinter
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Aniruddha Deb
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - James E. Penner-Hahn
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Vincent L. Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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33
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Ruckthong L, Stuckey JA, Pecoraro VL. How Outer Coordination Sphere Modifications Can Impact Metal Structures in Proteins: A Crystallographic Evaluation. Chemistry 2019; 25:6773-6787. [PMID: 30861211 PMCID: PMC6510599 DOI: 10.1002/chem.201806040] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Indexed: 11/06/2022]
Abstract
A challenging objective of de novo metalloprotein design is to control of the outer coordination spheres of an active site to fine tune metal properties. The well-defined three stranded coiled coils, TRI and CoilSer peptides, are used to address this question. Substitution of Cys for Leu yields a thiophilic site within the core. Metals such as HgII , PbII , and AsIII result in trigonal planar or trigonal pyramidal geometries; however, spectroscopic studies have shown that CdII forms three-, four- or five-coordinate CdII S3 (OH2 )x (in which x=0-2) when the outer coordination spheres are perturbed. Unfortunately, there has been little crystallographic examination of these proteins to explain the observations. Here, the high-resolution X-ray structures of apo- and mercurated proteins are compared to explain the modifications that lead to metal coordination number and geometry variation. It reveals that Ala substitution for Leu opens a cavity above the Cys site allowing for water excess, facilitating CdII S3 (OH2 ). Replacement of Cys by Pen restricts thiol rotation, causing a shift in the metal-binding plane, which displaces water, forming CdII S3 . Residue d-Leu, above the Cys site, reorients the side chain towards the Cys layer, diminishing the space for water accommodation yielding CdII S3 , whereas d-Leu below opens more space, allowing for equal CdII S3 (OH2 ) and CdII S3 (OH2 )2 . These studies provide insights into how to control desired metal geometries in metalloproteins by using coded and non-coded amino acids.
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Affiliation(s)
- Leela Ruckthong
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, USA
- Department of Chemistry, Faculty of Science, King Mongkut's University of Technology, Thonburi (KMUTT), Bang Mod, Thung Khru, Bangkok, 10140, Thailand
| | - Jeanne A Stuckey
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan, 48109, USA
- Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, USA
| | - Vincent L Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, USA
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34
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Lutter JC, Lopez Bermudez BA, Nguyen TN, Kampf JW, Pecoraro VL. Functionalization of luminescent lanthanide-gallium metallacrowns using copper-catalyzed alkyne-azide cycloaddition and thiol-maleimide Michael addition. J Inorg Biochem 2019; 192:119-125. [DOI: 10.1016/j.jinorgbio.2018.12.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 12/21/2018] [Indexed: 10/27/2022]
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35
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Koebke KJ, Ruckthong L, Meagher JL, Mathieu E, Harland J, Deb A, Lehnert N, Policar C, Tard C, Penner-Hahn JE, Stuckey JA, Pecoraro VL. Clarifying the Copper Coordination Environment in a de Novo Designed Red Copper Protein. Inorg Chem 2018; 57:12291-12302. [PMID: 30226758 DOI: 10.1021/acs.inorgchem.8b01989] [Citation(s) in RCA: 15] [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: 12/11/2022]
Abstract
Cupredoxins are copper-dependent electron-transfer proteins that can be categorized as blue, purple, green, and red depending on the spectroscopic properties of the Cu(II) bound forms. Interestingly, despite significantly different first coordination spheres and nuclearity, all cupredoxins share a common Greek Key β-sheet fold. We have previously reported the design of a red copper protein within a completely distinct three-helical bundle protein, α3DChC2. (1) While this design demonstrated that a β-barrel fold was not requisite to recapitulate the properties of a native cupredoxin center, the parent peptide α3D was not sufficiently stable to allow further study through additional mutations. Here we present the design of an elongated protein GRANDα3D (GRα3D) with Δ Gu = -11.4 kcal/mol compared to the original design's -5.1 kcal/mol. Diffraction quality crystals were grown of GRα3D (a first for an α3D peptide) and solved to a resolution of 1.34 Å. Examination of this structure suggested that Glu41 might interact with the Cu in our previously reported red copper protein. The previous bis(histidine)(cysteine) site (GRα3DChC2) was designed into this new scaffold and a series of variant constructs were made to explore this hypothesis. Mutation studies around Glu41 not only prove the proposed interaction, but also enabled tuning of the constructs' hyperfine coupling constant from 160 to 127 × 10-4 cm-1. X-ray absorption spectroscopy analysis is consistent with these hyperfine coupling differences being the result of variant 4p mixing related to coordination geometry changes. These studies not only prove that an Glu41-Cu interaction leads to the α3DChC2 construct's red copper protein like spectral properties, but also exemplify the exact control one can have in a de novo construct to tune the properties of an electron-transfer Cu site.
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Affiliation(s)
| | | | | | - Emilie Mathieu
- Laboratoire des biomolécules, LBM, Département de chimie , École normale supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
| | | | | | | | - Clotilde Policar
- Laboratoire des biomolécules, LBM, Département de chimie , École normale supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
| | - Cédric Tard
- LCM, CNRS, Ecole Polytechnique , Université Paris-Saclay , 91128 Palaiseau Cedex , France
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36
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Abstract
The development of redox-active metalloprotein catalysts is a challenging objective of de novo protein design. Within this Perspective we detail our efforts to create a redox-active Cu nitrite reductase (NiR) by incorporating Cu into the hydrophobic interior of well-defined three-stranded coiled coils (3SCCs). The scaffold contains three histidine residues that provide a layer of three nitrogen donors that mimic the type 2 catalytic site of NiR. We have found that this strategy successfully produces an active and stable CuNiR model that functions for over 1000 turnovers. Spectroscopic evidence indicates that the Cu(I) site has a lower coordination number in comparison to the enzyme, whereas the Cu(II) geometry may more faithfully reproduce the NiR type 2 center. Mutations at the helical interface successfully produce a hydrogen bond between an interfacial Glu residue and the Culigating His residue, which allows for the tuning of the redox potential over a 100 mV range. We successfully created constructs with as much as a 120-fold improvement from the original design by modifying the steric bulk above or below the Cu binding site. These systems are now the most active water-soluble and stable artificial NiR catalysts yet produced. Several avenues for improving the catalytic efficiency of later designs are detailed within this Perspective, including adjustment of their resting oxidation state, the use of asymmetric scaffolds to allow for single amino acid mutation within the second coordination sphere, and the design of hydrogen-bonding networks to tune residue orientation and electronics. Through these studies the TRI-H system has given insight into the difficulties that arise in creating a de novo redox active enzyme. Work to improve upon this model will provide strategies by which redox-active de novo enzymes may be tuned and detail how native enzymes accomplish catalytic efficiencies through proton gated redox catalysis.
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Affiliation(s)
- Karl J. Koebke
- Department of Chemistry, University of Michigan Ann Arbor, Michigan 48109, United States
| | - Vincent L. Pecoraro
- Department of Chemistry, University of Michigan Ann Arbor, Michigan 48109, United States
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37
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Marzaroli V, Marchió L, Spigolon G, Licini G, Pecoraro VL, Tegoni M. Engeneering novel porous 3D metallacrown frameworks, through the ligand periphery design. Acta Crystallogr A Found Adv 2018. [DOI: 10.1107/s2053273318089635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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38
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Lutter JC, Eliseeva SV, Kampf JW, Petoud S, Pecoraro VL. A Unique Ln
III
{[3.3.1]Ga
III
Metallacryptate} Series That Possesses Properties of Slow Magnetic Relaxation and Visible/Near‐Infrared Luminescence. Chemistry 2018; 24:10773-10783. [DOI: 10.1002/chem.201801355] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Jacob C. Lutter
- Department of Chemistry Willard H. Dow Laboratories University of Michigan Ann Arbor MI 48109 USA
| | | | - Jeff W. Kampf
- Department of Chemistry Willard H. Dow Laboratories University of Michigan Ann Arbor MI 48109 USA
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire CNRS UPR 4301 45071 Orléans Cedex 2 France
| | - Vincent L. Pecoraro
- Department of Chemistry Willard H. Dow Laboratories University of Michigan Ann Arbor MI 48109 USA
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39
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Tebo AG, Pinter TBJ, García-Serres R, Speelman AL, Tard C, Sénéque O, Blondin G, Latour JM, Penner-Hahn J, Lehnert N, Pecoraro VL. Development of a Rubredoxin-Type Center Embedded in a de Dovo-Designed Three-Helix Bundle. Biochemistry 2018; 57:2308-2316. [PMID: 29561598 DOI: 10.1021/acs.biochem.8b00091] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Protein design is a powerful tool for interrogating the basic requirements for the function of a metal site in a way that allows for the selective incorporation of elements that are important for function. Rubredoxins are small electron transfer proteins with a reduction potential centered near 0 mV (vs normal hydrogen electrode). All previous attempts to design a rubredoxin site have focused on incorporating the canonical CXXC motifs in addition to reproducing the peptide fold or using flexible loop regions to define the morphology of the site. We have produced a rubredoxin site in an utterly different fold, a three-helix bundle. The spectra of this construct mimic the ultraviolet-visible, Mössbauer, electron paramagnetic resonance, and magnetic circular dichroism spectra of native rubredoxin. Furthermore, the measured reduction potential suggests that this rubredoxin analogue could function similarly. Thus, we have shown that an α-helical scaffold sustains a rubredoxin site that can cycle with the desired potential between the Fe(II) and Fe(III) states and reproduces the spectroscopic characteristics of this electron transport protein without requiring the classic rubredoxin protein fold.
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Affiliation(s)
- Alison G Tebo
- Program in Chemical Biology , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Tyler B J Pinter
- Department of Chemistry and Biophysics , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Ricardo García-Serres
- Université Grenoble Alpes, CNRS, CEA, BIG, LCBM (UMR 5249), F-38054 Grenoble , France
| | - Amy L Speelman
- Department of Chemistry and Biophysics , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Cédric Tard
- LCM, CNRS, École Polytechnique, Université Paris-Saclay, 91128 Palaiseau Cedex, France
| | - Olivier Sénéque
- Université Grenoble Alpes, CNRS, CEA, BIG, LCBM (UMR 5249), F-38054 Grenoble , France
| | - Geneviève Blondin
- Université Grenoble Alpes, CNRS, CEA, BIG, LCBM (UMR 5249), F-38054 Grenoble , France
| | - Jean-Marc Latour
- Université Grenoble Alpes, CNRS, CEA, BIG, LCBM (UMR 5249), F-38054 Grenoble , France
| | - James Penner-Hahn
- Department of Chemistry and Biophysics , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Nicolai Lehnert
- Department of Chemistry and Biophysics , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Vincent L Pecoraro
- Program in Chemical Biology , University of Michigan , Ann Arbor , Michigan 48109 , United States.,Department of Chemistry and Biophysics , University of Michigan , Ann Arbor , Michigan 48109 , United States
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40
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Koebke KJ, Yu F, Salerno E, Van Stappen C, Tebo AG, Penner-Hahn JE, Pecoraro VL. Modifying the Steric Properties in the Second Coordination Sphere of Designed Peptides Leads to Enhancement of Nitrite Reductase Activity. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712757] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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)
- Karl J. Koebke
- Department of Chemistry; University of Michigan; Ann Arbor MI 48109 USA
| | - Fangting Yu
- Department of Chemistry; University of Michigan; Ann Arbor MI 48109 USA
| | - Elvin Salerno
- Department of Chemistry; University of Michigan; Ann Arbor MI 48109 USA
| | - Casey Van Stappen
- Department of Chemistry; University of Michigan; Ann Arbor MI 48109 USA
| | - Alison G. Tebo
- Department of Chemistry; University of Michigan; Ann Arbor MI 48109 USA
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41
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Koebke KJ, Yu F, Salerno E, Van Stappen C, Tebo AG, Penner-Hahn JE, Pecoraro VL. Modifying the Steric Properties in the Second Coordination Sphere of Designed Peptides Leads to Enhancement of Nitrite Reductase Activity. Angew Chem Int Ed Engl 2018; 57:3954-3957. [PMID: 29316146 DOI: 10.1002/anie.201712757] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [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: 12/14/2017] [Indexed: 11/10/2022]
Abstract
Protein design is a useful strategy to interrogate the protein structure-function relationship. We demonstrate using a highly modular 3-stranded coiled coil (TRI-peptide system) that a functional type 2 copper center exhibiting copper nitrite reductase (NiR) activity exhibits the highest homogeneous catalytic efficiency under aqueous conditions for the reduction of nitrite to NO and H2 O. Modification of the amino acids in the second coordination sphere of the copper center increases the nitrite reductase activity up to 75-fold compared to previously reported systems. We find also that steric bulk can be used to enforce a three-coordinate CuI in a site, which tends toward two-coordination with decreased steric bulk. This study demonstrates the importance of the second coordination sphere environment both for controlling metal-center ligation and enhancing the catalytic efficiency of metalloenzymes and their analogues.
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Affiliation(s)
- Karl J Koebke
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Fangting Yu
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Elvin Salerno
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Casey Van Stappen
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Alison G Tebo
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | | | - Vincent L Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
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Nguyen TN, Chow CY, Eliseeva SV, Trivedi ER, Kampf JW, Martinić I, Petoud S, Pecoraro VL. Cover Feature: One-Step Assembly of Visible and Near-Infrared Emitting Metallacrown Dimers Using a Bifunctional Linker (Chem. Eur. J. 5/2018). Chemistry 2018. [DOI: 10.1002/chem.201705225] [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: 11/10/2022]
Affiliation(s)
- Tu N. Nguyen
- Department of Chemistry, Willard H. Dow Laboratories; University of Michigan; Ann Arbor Michigan 48109 United States
| | - Chun Y. Chow
- Department of Chemistry, Willard H. Dow Laboratories; University of Michigan; Ann Arbor Michigan 48109 United States
| | | | - Evan R. Trivedi
- Department of Chemistry, Willard H. Dow Laboratories; University of Michigan; Ann Arbor Michigan 48109 United States
| | - Jeff W. Kampf
- Department of Chemistry, Willard H. Dow Laboratories; University of Michigan; Ann Arbor Michigan 48109 United States
| | - Ivana Martinić
- Centre de Biophysique Moléculaire; CNRS UPR 4301; 45071 Orléans Cedex 2 France
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire; CNRS UPR 4301; 45071 Orléans Cedex 2 France
- Department of Inorganic, Applied and Analytical Chemistry; University of Geneva; 1211 Geneva 4 Switzerland
| | - Vincent L. Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories; University of Michigan; Ann Arbor Michigan 48109 United States
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Lutter JC, Zaleski CM, Pecoraro VL. Metallacrowns: Supramolecular Constructs With Potential in Extended Solids, Solution-State Dynamics, Molecular Magnetism, and Imaging. ADVANCES IN INORGANIC CHEMISTRY 2018. [DOI: 10.1016/bs.adioch.2017.11.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Cabral ACS, Jakovleska J, Deb A, Penner-Hahn JE, Pecoraro VL, Freisinger E. Further insights into the metal ion binding abilities and the metalation pathway of a plant metallothionein from Musa acuminata. J Biol Inorg Chem 2018; 23:91-107. [PMID: 29218632 PMCID: PMC5756683 DOI: 10.1007/s00775-017-1513-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 11/07/2017] [Indexed: 10/18/2022]
Abstract
The superfamily of metallothioneins (MTs) combines a diverse group of metalloproteins, sharing the characteristics of rather low molecular weight and high cysteine content. The latter provides MTs with the capability to coordinate thiophilic metal ions, in particular those with a d 10 electron configuration. The sub-family of plant MT3 proteins is only poorly characterized and there is a complete lack of three-dimensional structure information. Building upon our previous results on the Musa acuminata MT3 (musMT3) protein, the focus of the present work is to understand the metal cluster formation process, the role of the single histidine residue present in musMT3, and the metal ion binding affinity. We concentrate our efforts on the coordination of ZnII and CdII ions, using CoII as a spectroscopic probe for ZnII binding. The overall protein-fold is analysed with a combination of limited proteolytic digestion, mass spectrometry, and dynamic light scattering. Histidine coordination of metal ions is probed with extended X-ray absorption fine structure spectroscopy and CoII titration experiments. Initial experiments with isothermal titration calorimetry provide insights into the thermodynamics of metal ion binding.
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Affiliation(s)
- Augusto C S Cabral
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Jovana Jakovleska
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Aniruddha Deb
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, MI, 48109, USA
| | - James E Penner-Hahn
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, MI, 48109, USA
| | - Vincent L Pecoraro
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, MI, 48109, USA
| | - Eva Freisinger
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.
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Nguyen TN, Chow CY, Eliseeva SV, Trivedi ER, Kampf JW, Martinić I, Petoud S, Pecoraro VL. One‐Step Assembly of Visible and Near‐Infrared Emitting Metallacrown Dimers Using a Bifunctional Linker. Chemistry 2017; 24:1031-1035. [DOI: 10.1002/chem.201703911] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Indexed: 12/21/2022]
Affiliation(s)
- Tu N. Nguyen
- Department of Chemistry, Willard H. Dow Laboratories University of Michigan Ann Arbor Michigan 48109 United States
| | - Chun Y. Chow
- Department of Chemistry, Willard H. Dow Laboratories University of Michigan Ann Arbor Michigan 48109 United States
| | | | - Evan R. Trivedi
- Department of Chemistry, Willard H. Dow Laboratories University of Michigan Ann Arbor Michigan 48109 United States
| | - Jeff W. Kampf
- Department of Chemistry, Willard H. Dow Laboratories University of Michigan Ann Arbor Michigan 48109 United States
| | - Ivana Martinić
- Centre de Biophysique Moléculaire CNRS UPR 4301 45071 Orléans Cedex 2 France
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire CNRS UPR 4301 45071 Orléans Cedex 2 France
- Department of Inorganic, Applied and Analytical Chemistry University of Geneva 1211 Geneva 4 Switzerland
| | - Vincent L. Pecoraro
- Department of Chemistry, Willard H. Dow Laboratories University of Michigan Ann Arbor Michigan 48109 United States
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Martinić I, Eliseeva SV, Nguyen TN, Foucher F, Gosset D, Westall F, Pecoraro VL, Petoud S. Near-infrared luminescent metallacrowns for combined in vitro cell fixation and counter staining. Chem Sci 2017; 8:6042-6050. [PMID: 28989634 PMCID: PMC5625569 DOI: 10.1039/c7sc01872j] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 06/21/2017] [Indexed: 01/01/2023] Open
Abstract
Cell fixation is an essential approach for preserving cell morphology, allowing the targeting and labelling of biomolecules with fluorescent probes. One of the key requirements for more efficient fluorescent labelling is the preservation of cell morphology, which usually requires a combination of several fixation techniques. In addition, the use of a counter stain is often essential to improve the contrast of the fluorescent probes. Current agents possess significant limitations, such as low resistance toward photobleaching and sensitivity to changes in the microenvironment. Luminescent Ln3+ 'encapsulated sandwich' metallacrowns (MCs) overcome these drawbacks and offer complementary advantages. In particular, they emit sharp emission bands, possess a large difference between excitation and emission wavelengths and do not photobleach. Herein, MCs formed with pyrazinehydroxamic acid (Ln3+[Zn(ii)MCpyzHA], Ln3+ = Yb, Nd) were used, combined with near-infrared (NIR) counter staining and fixation agents for HeLa cells upon an initial five minute exposure to UV-A light. The validity and quality of the cell fixation were assessed with Raman spectroscopy. Analysis of the NIR luminescence properties of these MCs was performed under different experimental conditions, including in a suspension of stained cells. Moreover, the high emission intensity of Ln3+[Zn(ii)MCpyzHA] in the NIR region allows these MCs to be used for imaging with standard CCD cameras installed on routine fluorescence microscopes. Finally, the NIR-emitting Ln3+[Zn(ii)MCpyzHA] compounds combine, within a single molecule, features such as cell fixation and staining abilities, good photostability and minimal sensitivity of the emission bands to the local microenvironment, and they are highly promising for establishing the next generation of imaging agents with a single biodistribution.
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Affiliation(s)
- Ivana Martinić
- Centre de Biophysique Moléculaire , CNRS , UPR 4301 , 45071 Orléans Cedex 2 , France . ;
| | - Svetlana V Eliseeva
- Centre de Biophysique Moléculaire , CNRS , UPR 4301 , 45071 Orléans Cedex 2 , France . ;
| | - Tu N Nguyen
- Department of Chemistry , Willard H. Dow Laboratories , University of Michigan , 930 N. University Ave , Michigan 48109 , USA .
| | - Frédéric Foucher
- Centre de Biophysique Moléculaire , CNRS , UPR 4301 , 45071 Orléans Cedex 2 , France . ;
| | - David Gosset
- Centre de Biophysique Moléculaire , CNRS , UPR 4301 , 45071 Orléans Cedex 2 , France . ;
| | - Frances Westall
- Centre de Biophysique Moléculaire , CNRS , UPR 4301 , 45071 Orléans Cedex 2 , France . ;
| | - Vincent L Pecoraro
- Department of Chemistry , Willard H. Dow Laboratories , University of Michigan , 930 N. University Ave , Michigan 48109 , USA .
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire , CNRS , UPR 4301 , 45071 Orléans Cedex 2 , France . ;
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Martinić I, Eliseeva SV, Nguyen TN, Pecoraro VL, Petoud S. Near-Infrared Optical Imaging of Necrotic Cells by Photostable Lanthanide-Based Metallacrowns. J Am Chem Soc 2017; 139:8388-8391. [DOI: 10.1021/jacs.7b01587] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Ivana Martinić
- Centre de Biophysique Moléculaire, CNRS UPR 4301, 45071 Orléans Cedex 2, France
| | | | - Tu N. Nguyen
- Department
of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Vincent L. Pecoraro
- Department
of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire, CNRS UPR 4301, 45071 Orléans Cedex 2, France
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Ruckthong L, Peacock AFA, Pascoe CE, Hemmingsen L, Stuckey JA, Pecoraro VL. d-Cysteine Ligands Control Metal Geometries within De Novo Designed Three-Stranded Coiled Coils. Chemistry 2017; 23:8232-8243. [PMID: 28384393 DOI: 10.1002/chem.201700660] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Indexed: 12/31/2022]
Abstract
Although metal ion binding to naturally occurring l-amino acid proteins is well documented, understanding the impact of the opposite chirality (d-)amino acids on the structure and stereochemistry of metals is in its infancy. We examine the effect of a d-configuration cysteine within a designed l-amino acid three-stranded coiled coil in order to enforce a precise coordination number on a metal center. The d chirality does not alter the native fold, but the side-chain re-orientation modifies the sterics of the metal binding pocket. l-Cys side chains within the coiled-coil structure have previously been shown to rotate substantially from their preferred positions in the apo structure to create a binding site for a tetra-coordinate metal ion. However, here we show by X-ray crystallography that d-Cys side chains are preorganized within a suitable geometry to bind such a ligand. This is confirmed by comparison of the structure of ZnII Cl(CSL16D C)32- to the published structure of ZnII (H2 O)(GRAND-CSL12AL16L C)3- . Moreover, spectroscopic analysis indicates that the CdII geometry observed by using l-Cys ligands (a mixture of three- and four-coordinate CdII ) is altered to a single four-coordinate species when d-Cys is present. This work opens a new avenue for the control of the metal site environment in man-made proteins, by simply altering the binding ligand with its mirror-imaged d configuration. Thus, the use of non-coded amino acids in the coordination sphere of a metal promises to be a powerful tool for controlling the properties of future metalloproteins.
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Affiliation(s)
- Leela Ruckthong
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, USA
- Present address: Department Chemistry, Faculty of Science, King Mongkut's University of Technology Thonburi (KMUTT), Bang Mod, ThungKhru, Bangkok, 10140, Thailand
| | - Anna F A Peacock
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, USA
- Present address: School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Cherilyn E Pascoe
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, USA
| | - Lars Hemmingsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, København Ø, Denmark
| | - Jeanne A Stuckey
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan, 48109, USA
| | - Vincent L Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, USA
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Sgarlata C, Giuffrida A, Trivedi ER, Pecoraro VL, Arena G. Anion Encapsulation Drives the Formation of Dimeric Gd III[15-metallacrown-5] 3+ Complexes in Aqueous Solution. Inorg Chem 2017; 56:4771-4774. [PMID: 28414219 DOI: 10.1021/acs.inorgchem.6b03043] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Metallacrown complexes capable of sequestering dianions, as shown in the solid state, also exist in aqueous solution at neutral pH, as demonstrated by calorimetric and mass spectrometric data. The driving forces for the formation of these dimeric complexes in solution strongly depend on the chain length of the guest rather than its degree of unsaturation.
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Affiliation(s)
- Carmelo Sgarlata
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania , Via A. Doria 6, 95125 Catania, Italy
| | - Alessandro Giuffrida
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania , Via A. Doria 6, 95125 Catania, Italy
| | - Evan R Trivedi
- Department of Chemistry, University of Michigan , Ann Arbor, Michigan 48109-1055, United States
| | - Vincent L Pecoraro
- Department of Chemistry, University of Michigan , Ann Arbor, Michigan 48109-1055, United States
| | - Giuseppe Arena
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania , Via A. Doria 6, 95125 Catania, Italy
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Cangelosi V, Ruckthong L, Pecoraro VL. Lead(II) Binding in Natural and Artificial Proteins. Met Ions Life Sci 2017; 17:/books/9783110434330/9783110434330-010/9783110434330-010.xml. [PMID: 28731303 PMCID: PMC5771651 DOI: 10.1515/9783110434330-010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
This article describes recent attempts to understand the biological chemistry of lead using a synthetic biology approach. Lead binds to a variety of different biomolecules ranging from enzymes to regulatory and signaling proteins to bone matrix. We have focused on the interactions of this element in thiolate-rich sites that are found in metalloregulatory proteins such as Pbr, Znt, and CadC and in enzymes such as δ-aminolevulinic acid dehydratase (ALAD). In these proteins, Pb(II) is often found as a homoleptic and hemidirectic Pb(II)(SR)3- complex. Using first principles of biophysics, we have developed relatively short peptides that can associate into three-stranded coiled coils (3SCCs), in which a cysteine group is incorporated into the hydrophobic core to generate a (cysteine)3 binding site. We describe how lead may be sequestered into these sites, the characteristic spectral features may be observed for such systems and we provide crystallographic insight on metal binding. The Pb(II)(SR)3- that is revealed within these α-helical assemblies forms a trigonal pyramidal structure (having an endo orientation) with distinct conformations than are also found in natural proteins (having an exo conformation). This structural insight, combined with 207Pb NMR spectroscopy, suggests that while Pb(II) prefers hemidirected Pb(II)(SR)3- scaffolds regardless of the protein fold, the way this is achieved within α-helical systems is different than in β-sheet or loop regions of proteins. These interactions between metal coordination preference and protein structural preference undoubtedly are exploited in natural systems to allow for protein conformation changes that define function. Thus, using a design approach that separates the numerous factors that lead to stable natural proteins allows us to extract fundamental concepts on how metals behave in biological systems.
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