151
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Schmid MH, Das AK, Landis CR, Meuwly M. Multi-State VALBOND for Atomistic Simulations of Hypervalent Molecules, Metal Complexes, and Reactions. J Chem Theory Comput 2018; 14:3565-3578. [DOI: 10.1021/acs.jctc.7b01210] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Maurus H. Schmid
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland
| | - Akshaya Kumar Das
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland
| | - Clark R. Landis
- Department of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Markus Meuwly
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland
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152
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Oya N, Yamada M, Surinwong S, Kuwamura N, Konno T. A stable thiolato-Cu I-thiolato triple linkage that bridges two cobalt(iii) centres. Dalton Trans 2018; 47:2497-2500. [PMID: 29376536 DOI: 10.1039/c7dt04760f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of Λ-fac-[Co(d-pen-N,S)3]3- (d-H2pen = d-penicillamine) with Cu+ in water gave a stable CoCu complex, ΛΛ-[Co2Cu3(d-pen)6]3- ([1]3-), having three thiolato-copper(i)-thiolato moieties that bridge two cobalt(iii) centres. Complex [1]3- was isolated as a coordination polymer of Na3[1], which was converted to a complex salt of [Cr(H2O)6][1] by treatment with Cr(NO3)3.
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Affiliation(s)
- Naoyuki Oya
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
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153
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Wilkin OM, Harris N, Rooms JF, Dixon EL, Bridgeman AJ, Young NA. How Inert, Perturbing, or Interacting Are Cryogenic Matrices? A Combined Spectroscopic (Infrared, Electronic, and X-ray Absorption) and DFT Investigation of Matrix-Isolated Iron, Cobalt, Nickel, and Zinc Dibromides. J Phys Chem A 2018; 122:1994-2029. [DOI: 10.1021/acs.jpca.7b09734] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Owen M. Wilkin
- Department
of Chemistry, The University of Hull, Kingston upon Hull HU6
7RX, U.K
| | - Neil Harris
- Department
of Chemistry, The University of Hull, Kingston upon Hull HU6
7RX, U.K
| | - John F. Rooms
- Department
of Chemistry, The University of Hull, Kingston upon Hull HU6
7RX, U.K
| | - Emma L. Dixon
- Department
of Chemistry, The University of Hull, Kingston upon Hull HU6
7RX, U.K
| | - Adam J. Bridgeman
- School
of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Nigel A. Young
- Department
of Chemistry, The University of Hull, Kingston upon Hull HU6
7RX, U.K
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154
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Stein BW, Tichnell CR, Chen J, Shultz DA, Kirk ML. Excited State Magnetic Exchange Interactions Enable Large Spin Polarization Effects. J Am Chem Soc 2018; 140:2221-2228. [DOI: 10.1021/jacs.7b11397] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Benjamin W. Stein
- Department
of Chemistry and Chemical Biology, The University of New Mexico, MSC03
2060, 1 University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
- Chemistry
Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Christopher R. Tichnell
- Department
of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Ju Chen
- Department
of Chemistry and Chemical Biology, The University of New Mexico, MSC03
2060, 1 University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
| | - David A. Shultz
- Department
of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Martin L. Kirk
- Department
of Chemistry and Chemical Biology, The University of New Mexico, MSC03
2060, 1 University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
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155
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Ahmad T, Mahmood R, Georgieva I, Zahariev T, Tahir MN, Shaheen MA, Gilani MA, Ahmad S. Synthesis, crystal structure and DFT studies of a novel dinuclear copper(I) complex with triphenylphosphine and 2-mercaptonicotinic acid. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.10.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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156
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Mara MW, Hadt RG, Reinhard ME, Kroll T, Lim H, Hartsock RW, Alonso-Mori R, Chollet M, Glownia JM, Nelson S, Sokaras D, Kunnus K, Hodgson KO, Hedman B, Bergmann U, Gaffney KJ, Solomon EI. Metalloprotein entatic control of ligand-metal bonds quantified by ultrafast x-ray spectroscopy. Science 2018. [PMID: 28642436 DOI: 10.1126/science.aam6203] [Citation(s) in RCA: 91] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The multifunctional protein cytochrome c (cyt c) plays key roles in electron transport and apoptosis, switching function by modulating bonding between a heme iron and the sulfur in a methionine residue. This Fe-S(Met) bond is too weak to persist in the absence of protein constraints. We ruptured the bond in ferrous cyt c using an optical laser pulse and monitored the bond reformation within the protein active site using ultrafast x-ray pulses from an x-ray free-electron laser, determining that the Fe-S(Met) bond enthalpy is ~4 kcal/mol stronger than in the absence of protein constraints. The 4 kcal/mol is comparable with calculations of stabilization effects in other systems, demonstrating how biological systems use an entatic state for modest yet accessible energetics to modulate chemical function.
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Affiliation(s)
- Michael W Mara
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA.,Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Ryan G Hadt
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - Marco Eli Reinhard
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA
| | - Thomas Kroll
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.,Linac Coherent Light Source, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, USA
| | - Hyeongtaek Lim
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA.,Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Robert W Hartsock
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA
| | - Roberto Alonso-Mori
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, USA
| | - Matthieu Chollet
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, USA
| | - James M Glownia
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, USA
| | - Silke Nelson
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, USA
| | - Dimosthenis Sokaras
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.,Linac Coherent Light Source, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, USA
| | - Kristjan Kunnus
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA
| | - Keith O Hodgson
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA.,Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Britt Hedman
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Uwe Bergmann
- PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA.,Linac Coherent Light Source, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, USA
| | - Kelly J Gaffney
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.,PULSE Institute, SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA
| | - Edward I Solomon
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA. .,Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
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157
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Naumova M, Khakhulin D, Rebarz M, Rohrmüller M, Dicke B, Biednov M, Britz A, Espinoza S, Grimm-Lebsanft B, Kloz M, Kretzschmar N, Neuba A, Ortmeyer J, Schoch R, Andreasson J, Bauer M, Bressler C, Gero Schmidt W, Henkel G, Rübhausen M. Structural dynamics upon photoexcitation-induced charge transfer in a dicopper(i)–disulfide complex. Phys Chem Chem Phys 2018; 20:6274-6286. [DOI: 10.1039/c7cp04880g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A study of structural evolution upon photoinduced charge transfer in a dicopper complex with biologically relevant sulfur coordination.
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158
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Avelar M, Pastor N, Ramirez-Ramirez J, Ayala M. Replacement of oxidizable residues predicted by QM-MM simulation of a fungal laccase generates variants with higher operational stability. J Inorg Biochem 2018; 178:125-133. [DOI: 10.1016/j.jinorgbio.2017.10.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 10/09/2017] [Accepted: 10/10/2017] [Indexed: 11/28/2022]
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159
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Khan S, Herrero S, González-Prieto R, Drew MGB, Banerjee S, Chattopadhyay S. A mixed phenoxo and end-on azide bridged dinuclear copper(ii) Schiff base complex: synthesis, structure, magnetic characterization and DFT study. NEW J CHEM 2018. [DOI: 10.1039/c8nj02612b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The magnetic properties of a dinuclear copper(ii) Schiff base complex with dissimilar bridges have been investigated through some theoretical calculations (DFT) using suitable modeled structures.
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Affiliation(s)
- Samim Khan
- Department of Chemistry
- Jadavpur University
- Kolkata-700 032
- India
| | - Santiago Herrero
- Departamento de Química Inorgánica
- Facultad de Ciencias Químicas
- Universidad Complutense de Madrid
- Ciudad Universitaria
- 28040 Madrid
| | - Rodrigo González-Prieto
- Departamento de Química Inorgánica
- Facultad de Ciencias Químicas
- Universidad Complutense de Madrid
- Ciudad Universitaria
- 28040 Madrid
| | | | - Snehasis Banerjee
- Govt. College of Engineering and Leather Technology
- Salt Lake Sector-III
- Kolkata-700 106
- India
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160
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Romero-Muñiz C, Ortega M, Vilhena JG, Díez-Pérez I, Cuevas JC, Pérez R, Zotti LA. Ab initio electronic structure calculations of entire blue copper azurins. Phys Chem Chem Phys 2018; 20:30392-30402. [DOI: 10.1039/c8cp06862c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We present a theoretical study of the blue-copper azurin extracted from Pseudomonas aeruginosa and several of its single amino acid mutants.
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Affiliation(s)
- Carlos Romero-Muñiz
- Departamento de Física Teórica de la Materia Condensada
- Universidad Autónoma de Madrid
- E-28049 Madrid
- Spain
| | - María Ortega
- Departamento de Física Teórica de la Materia Condensada
- Universidad Autónoma de Madrid
- E-28049 Madrid
- Spain
| | - J. G. Vilhena
- Departamento de Física Teórica de la Materia Condensada
- Universidad Autónoma de Madrid
- E-28049 Madrid
- Spain
- Department of Physics
| | - I. Díez-Pérez
- Department of Materials Science and Physical Chemistry & Institute of Theoretical and Computational Chemistry (IQTCUB)
- University of Barcelona
- Barcelona 08028
- Spain
- Department of Chemistry
| | - Juan Carlos Cuevas
- Departamento de Física Teórica de la Materia Condensada
- Universidad Autónoma de Madrid
- E-28049 Madrid
- Spain
- Condensed Matter Physics Center (IFIMAC)
| | - Rubén Pérez
- Departamento de Física Teórica de la Materia Condensada
- Universidad Autónoma de Madrid
- E-28049 Madrid
- Spain
- Condensed Matter Physics Center (IFIMAC)
| | - Linda A. Zotti
- Departamento de Física Teórica de la Materia Condensada
- Universidad Autónoma de Madrid
- E-28049 Madrid
- Spain
- Condensed Matter Physics Center (IFIMAC)
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161
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Sinicropi A. DFT modeling of structures and redox potentials of wild-type, Nickel-substituted and mutated (N47S/M121L, HPAz) Azurin. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.08.041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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162
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Ziesak A, Steuer L, Kaifer E, Wagner N, Beck J, Wadepohl H, Himmel HJ. Intramolecular metal–ligand electron transfer triggered by co-ligand substitution. Dalton Trans 2018; 47:9430-9441. [DOI: 10.1039/c8dt01234b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Labile co-ligands are attached to a dinuclear copper(i) complex with a redox-active bridging guanidine ligand. Their substitution triggers electron-transfer from the copper atoms to the guanidine.
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Affiliation(s)
- Alexandra Ziesak
- Anorganisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Lena Steuer
- Anorganisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Norbert Wagner
- Institut für Anorganische Chemie
- Universität Bonn
- 53121 Bonn
- Germany
| | - Johannes Beck
- Institut für Anorganische Chemie
- Universität Bonn
- 53121 Bonn
- Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut
- Ruprecht-Karls-Universität Heidelberg
- 69120 Heidelberg
- Germany
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163
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Zhou S, Rousselot-Pailley P, Ren L, Charmasson Y, Dezord EC, Robert V, Tron T, Mekmouche Y. Production and manipulation of blue copper oxidases for technological applications. Methods Enzymol 2018; 613:17-61. [DOI: 10.1016/bs.mie.2018.10.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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164
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Maiti BK, Almeida RM, Moura I, Moura JJ. Rubredoxins derivatives: Simple sulphur-rich coordination metal sites and its relevance for biology and chemistry. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.10.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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165
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Czekański Ł, Hoffmann SK, Barczyński P, Gąsowska A, Zalewska A, Goslar J, Ratajczak-Sitarz M, Katrusiak A. Syntheses, Crystal Structures and Spectroscopic Studies of Bis[1-methyl-3-(methoxycarbonylmethyl)-benzimidazolium] 2+
[CuBr 4
] 2−
and [ZnBr 4
] 2−
Compounds. ChemistrySelect 2017. [DOI: 10.1002/slct.201701716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Łukasz Czekański
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89b 61−614 Poznań Poland
| | - Stanisław K. Hoffmann
- Institute of Molecular Physics; Polish Academy of Sciences; Mariana Smoluchowskiego 17 60-179 Poznań Poland
| | - Piotr Barczyński
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89b 61−614 Poznań Poland
| | - A. Gąsowska
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89b 61−614 Poznań Poland
| | - Alina Zalewska
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89b 61−614 Poznań Poland
| | - Janina Goslar
- Institute of Molecular Physics; Polish Academy of Sciences; Mariana Smoluchowskiego 17 60-179 Poznań Poland
| | | | - Andrzej Katrusiak
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89b 61−614 Poznań Poland
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166
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Segoviano-Garfias JJ, Nájera-Lara M, Pérez-Arredondo MDLL, López-Ramírez V, Rubio-Jimenez C, Ramírez-Vázquez JA, Moreno-Esparza R. Spectrophotometric determination of formation constants of copper(II) complexes with 2,2′-bipyridyl, 1,10-phenanthroline and their halides in methanol. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.06.112] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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167
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Study of the Cys-His bridge electron transfer pathway in a copper-containing nitrite reductase by site-directed mutagenesis, spectroscopic, and computational methods. Biochim Biophys Acta Gen Subj 2017; 1862:752-760. [PMID: 29051066 DOI: 10.1016/j.bbagen.2017.10.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Revised: 09/06/2017] [Accepted: 10/12/2017] [Indexed: 11/22/2022]
Abstract
The Cys-His bridge as electron transfer conduit in the enzymatic catalysis of nitrite to nitric oxide by nitrite reductase from Sinorhizobium meliloti 2011 (SmNir) was evaluated by site-directed mutagenesis, steady state kinetic studies, UV-vis and EPR spectroscopic measurements as well as computational calculations. The kinetic, structural and spectroscopic properties of the His171Asp (H171D) and Cys172Asp (C172D) SmNir variants were compared with the wild type enzyme. Molecular properties of H171D and C172D indicate that these point mutations have not visible effects on the quaternary structure of SmNir. Both variants are catalytically incompetent using the physiological electron donor pseudoazurin, though C172D presents catalytic activity with the artificial electron donor methyl viologen (kcat=3.9(4) s-1) lower than that of wt SmNir (kcat=240(50) s-1). QM/MM calculations indicate that the lack of activity of H171D may be ascribed to the Nδ1H…OC hydrogen bond that partially shortcuts the T1-T2 bridging Cys-His covalent pathway. The role of the Nδ1H…OC hydrogen bond in the pH-dependent catalytic activity of wt SmNir is also analyzed by monitoring the T1 and T2 oxidation states at the end of the catalytic reaction of wt SmNir at pH6 and 10 by UV-vis and EPR spectroscopies. These data provide insight into how changes in Cys-His bridge interrupts the electron transfer between T1 and T2 and how the pH-dependent catalytic activity of the enzyme are related to pH-dependent structural modifications of the T1-T2 bridging chemical pathway.
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168
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Ruiz MP, Aragonès AC, Camarero N, Vilhena JG, Ortega M, Zotti LA, Pérez R, Cuevas JC, Gorostiza P, Díez-Pérez I. Bioengineering a Single-Protein Junction. J Am Chem Soc 2017; 139:15337-15346. [DOI: 10.1021/jacs.7b06130] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Marta P. Ruiz
- Departament of Materials Science and Physical Chemistry & Institute of Theoretical and Computational Chemistry (IQTCUB), University of Barcelona, Martí i Franquès, 1, Barcelona 08028, Spain
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona
Institute of Science and Technology (BIST), Baldiri Reixac 15-21, Barcelona 08028, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN), Campus Río Ebro-Edificio
I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
| | - Albert C. Aragonès
- Departament of Materials Science and Physical Chemistry & Institute of Theoretical and Computational Chemistry (IQTCUB), University of Barcelona, Martí i Franquès, 1, Barcelona 08028, Spain
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona
Institute of Science and Technology (BIST), Baldiri Reixac 15-21, Barcelona 08028, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN), Campus Río Ebro-Edificio
I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
| | - Nuria Camarero
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona
Institute of Science and Technology (BIST), Baldiri Reixac 15-21, Barcelona 08028, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN), Campus Río Ebro-Edificio
I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
| | - J. G. Vilhena
- Departamento
de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
- Department
of Macromolecular Structures, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, 28049 Cantoblanco, Madrid, Spain
| | - Maria Ortega
- Departamento
de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Linda A. Zotti
- Departamento
de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Rubén Pérez
- Departamento
de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
- Condensed
Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Juan Carlos Cuevas
- Departamento
de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
- Condensed
Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Pau Gorostiza
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona
Institute of Science and Technology (BIST), Baldiri Reixac 15-21, Barcelona 08028, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN), Campus Río Ebro-Edificio
I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
- Catalan Institution for Research and Advanced Studies (ICREA)
| | - Ismael Díez-Pérez
- Departament of Materials Science and Physical Chemistry & Institute of Theoretical and Computational Chemistry (IQTCUB), University of Barcelona, Martí i Franquès, 1, Barcelona 08028, Spain
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona
Institute of Science and Technology (BIST), Baldiri Reixac 15-21, Barcelona 08028, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN), Campus Río Ebro-Edificio
I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
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169
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Sabolović J, Ramek M, Marković M. Calculating the geometry and Raman spectrum of physiological bis(l-histidinato)copper(II): an assessment of DFT functionals for aqueous and isolated systems. J Mol Model 2017; 23:290. [DOI: 10.1007/s00894-017-3448-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 08/28/2017] [Indexed: 11/24/2022]
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170
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Kohler L, Hadt RG, Hayes D, Chen LX, Mulfort KL. Synthesis, structure, and excited state kinetics of heteroleptic Cu(i) complexes with a new sterically demanding phenanthroline ligand. Dalton Trans 2017; 46:13088-13100. [PMID: 28944388 DOI: 10.1039/c7dt02476b] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this report we describe the synthesis of a new phenanthroline ligand, 2,9-di(2,4,6-tri-isopropyl-phenyl)-1,10-phenanthroline (bL2) and its use as the blocking ligand in the preparation of two new heteroleptic Cu(i)diimine complexes. Analysis of the CuHETPHEN single crystal structures shows a distinct distortion from an ideal tetrahedral geometry around the Cu(i) center, forced by the secondary phenanthroline ligand rotating to accommodate the isopropyl groups of bL2. The increased steric bulk of bL2 as compared to the more commonly used 2,9-dimesityl-1,10-phenanthroline blocking ligand prohibits intramolecular ligand-ligand interaction, which is unique among CuHETPHEN complexes. The ground state optical and redox properties of CuHETPHEN complexes are responsive to the substitution on the blocking ligand even though the differences in structure are far removed from the Cu(i) center. Transient optical spectroscopy was used to understand the excited state kinetics in both coordinating and non-coordinating solvents following visible excitation. Substitution of the blocking phenanthroline ligand has a significant impact on the 3MLCT decay and can be used to increase the excited state lifetime by 50%. Electronic structure calculations established relationships between ground and excited state properties, and general entatic state concepts are discussed for copper photosensitizers. This work contributes to the growing library of CuHETPHEN complexes and broadens the fundamental understanding of their ground and excited state properties.
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Affiliation(s)
- Lars Kohler
- Division of Chemical Sciences and Engineering, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
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171
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Ritterskamp N, Sharples K, Richards E, Folli A, Chiesa M, Platts JA, Murphy DM. Understanding the Coordination Modes of [Cu(acac) 2(imidazole) n=1,2] Adducts by EPR, ENDOR, HYSCORE, and DFT Analysis. Inorg Chem 2017; 56:11862-11875. [PMID: 28933856 DOI: 10.1021/acs.inorgchem.7b01874] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The interaction of imidazole with a [Cu(acac)2] complex was studied using electron paramagnetic resonance (EPR), electron nuclear double resonance (ENDOR), hyperfine sublevel correlation spectroscopy (HYSCORE), and density functional theory (DFT). At low Im ratios (Cu:Im 1:10), a 5-coordinate [Cu(acac)2Imn=1] monoadduct is formed in frozen solution with the spin Hamiltonian parameters g1 = 2.063, g2 = 2.063, g3 = 2.307, A1 = 26, A2 = 15, and A3 = 472 MHz with Im coordinating along the axial direction. At higher Im concentrations (Cu:Im 1:50), a 6-coordinate [Cu(acac)2Imn=2] bis-adduct is formed with the spin Hamiltonian parameters g1 = 2.059, g2 = 2.059, g3 = 2.288, A1 = 30, A2 = 30, and A3 = 498 MHz with a poorly resolved 14N superhyperfine pattern. The isotropic EPR spectra revealed a distribution of species ([Cu(acac)2], [Cu(acac)2Imn=1], and [Cu(acac)2Imn=2]) at Cu:Im ratios of 1:0, 1:10, and 1:50. The superhyperfine pattern originates from two strongly coordinating N3 imino nitrogens of the Im ring. Angular selective 14N ENDOR analysis revealed the NA tensor of [34.8, 43.5, 34.0] MHz, with e2qQ/h = 2.2 MHz and η = 0.2 for N3. The hyperfine and quadrupole values for the remote N1 amine nitrogens (from HYSCORE) were found to be [1.5, 1.4, 2.5] MHz with e2qQ/h = 1.4 MHz and η = 0.9. 1H ENDOR also revealed three sets of HA tensors corresponding to the nearly equivalent H2/H4 protons in addition to the H5 and H1 protons of the Im ring. The spin Hamiltonian parameters for the geometry optimized structures of [Cu(acac)2Imn=2], including cis-mixed plane, trans-axial, and trans-equatorial, were calculated. The best agreement between theory and experiment indicated the preferred coordination is trans-equatorial [Cu(acac)2Imn=2]. A number of other Im derivatives were also investigated. 4(5)-methyl-imidazole forms a [Cu(acac)2(Im-3)n=2] trans-equatorial adduct, whereas the bulkier 2-methyl-imidazole (Im-2) and benzimidazole (Im-4) form the [Cu(acac)2(Im-2,4)n=1] monoadduct only. Our data therefore show that subtle changes in the substrate structure lead to controllable changes in coordination behavior, which could in turn lead to rational design of complexes for use in catalysis, imaging, and medicine.
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Affiliation(s)
- Nadine Ritterskamp
- School of Chemistry, Cardiff University , Park Place, Cardiff CF10 3AT, U.K
| | - Katherine Sharples
- School of Chemistry, Cardiff University , Park Place, Cardiff CF10 3AT, U.K
| | - Emma Richards
- School of Chemistry, Cardiff University , Park Place, Cardiff CF10 3AT, U.K
| | - Andrea Folli
- School of Chemistry, Cardiff University , Park Place, Cardiff CF10 3AT, U.K
| | - Mario Chiesa
- Dipartimento di Chimica, Università di Torino , Via P. Giuria 7, 10125 Torino, Italy
| | - James A Platts
- School of Chemistry, Cardiff University , Park Place, Cardiff CF10 3AT, U.K
| | - Damien M Murphy
- School of Chemistry, Cardiff University , Park Place, Cardiff CF10 3AT, U.K
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172
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Fowler NJ, Blanford CF, Warwicker J, de Visser SP. Prediction of Reduction Potentials of Copper Proteins with Continuum Electrostatics and Density Functional Theory. Chemistry 2017; 23:15436-15445. [PMID: 28815759 PMCID: PMC5698706 DOI: 10.1002/chem.201702901] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Indexed: 12/20/2022]
Abstract
Blue copper proteins, such as azurin, show dramatic changes in Cu2+/Cu+ reduction potential upon mutation over the full physiological range. Hence, they have important functions in electron transfer and oxidation chemistry and have applications in industrial biotechnology. The details of what determines these reduction potential changes upon mutation are still unclear. Moreover, it has been difficult to model and predict the reduction potential of azurin mutants and currently no unique procedure or workflow pattern exists. Furthermore, high‐level computational methods can be accurate but are too time consuming for practical use. In this work, a novel approach for calculating reduction potentials of azurin mutants is shown, based on a combination of continuum electrostatics, density functional theory and empirical hydrophobicity factors. Our method accurately reproduces experimental reduction potential changes of 30 mutants with respect to wildtype within experimental error and highlights the factors contributing to the reduction potential change. Finally, reduction potentials are predicted for a series of 124 new mutants that have not yet been investigated experimentally. Several mutants are identified that are located well over 10 Å from the copper center that change the reduction potential by more than 85 mV. The work shows that secondary coordination sphere mutations mostly lead to long‐range electrostatic changes and hence can be modeled accurately with continuum electrostatics.
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Affiliation(s)
- Nicholas J Fowler
- Manchester Institute of Biotechnology and School of Chemistry, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, United Kingdom
| | - Christopher F Blanford
- Manchester Institute of Biotechnology and School of Materials, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, United Kingdom
| | - Jim Warwicker
- Manchester Institute of Biotechnology and School of Chemistry, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, United Kingdom
| | - Sam P de Visser
- Manchester Institute of Biotechnology, and School of Chemical Engineering and Analytical Science, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, United Kingdom
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173
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Affiliation(s)
- Nicolas Mano
- CNRS, CRPP, UPR 8641, 33600 Pessac, France
- University of Bordeaux, CRPP, UPR 8641, 33600 Pessac, France
| | - Anne de Poulpiquet
- Aix Marseille Univ., CNRS, BIP, 31, chemin Aiguier, 13402 Marseille, France
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174
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Das AK, Meuwly M. Hydration Control Through Intramolecular Degrees of Freedom: Molecular Dynamics of [Cu(II)(Imidazole)4]. J Phys Chem B 2017; 121:9024-9031. [DOI: 10.1021/acs.jpcb.7b05949] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akshaya K. Das
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4001 Basel, Switzerland
| | - Markus Meuwly
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4001 Basel, Switzerland
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175
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Schrempp DF, Leingang S, Schnurr M, Kaifer E, Wadepohl H, Himmel HJ. Inter- and Intramolecular Electron Transfer in Copper Complexes: Electronic Entatic State with Redox-Active Guanidine Ligands. Chemistry 2017; 23:13607-13611. [PMID: 28771843 DOI: 10.1002/chem.201703611] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Indexed: 02/01/2023]
Abstract
Fast and efficient electron transfer in blue copper proteins is realized by a structural harmonization between the CuI and CuII complex pair ("entatic state" model). Herein, we present now a CuI /CuII complex pair with redox-active guanidine ligands showing almost perfect match between both redox states. By modifying the ligand electron donor strength, the redox chemistry of the copper complex can be controlled to be either metal-centered or to cross the borderline to ligand-centered. This work is the first systematic study of complexes with redox-active ligands within the concept of the entatic state.
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Affiliation(s)
- David F Schrempp
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 275, 69120, Heidelberg, Germany
| | - Simone Leingang
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 275, 69120, Heidelberg, Germany
| | - Martin Schnurr
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 275, 69120, Heidelberg, Germany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 275, 69120, Heidelberg, Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 275, 69120, Heidelberg, Germany
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 275, 69120, Heidelberg, Germany
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176
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Alkoxo- and carboxylato-bridged hexanuclear copper(II) complex: Synthesis, structure and magnetic properties. INORG CHEM COMMUN 2017. [DOI: 10.1016/j.inoche.2017.06.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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177
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Seppälä P, Sillanpää R, Lehtonen A. Structural diversity of copper(II) amino alcoholate complexes. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.06.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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178
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Simonov AN, Hocking RK, Tao L, Gengenbach T, Williams T, Fang XY, King HJ, Bonke SA, Hoogeveen DA, Romano CA, Tebo BM, Martin LL, Casey WH, Spiccia L. Tunable Biogenic Manganese Oxides. Chemistry 2017; 23:13482-13492. [PMID: 28722330 DOI: 10.1002/chem.201702579] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Indexed: 11/08/2022]
Abstract
Influence of the conditions for aerobic oxidation of Mn2+(aq) catalysed by the MnxEFG protein complex on the morphology, structure and reactivity of the resulting biogenic manganese oxides (MnOx ) is explored. Physical characterisation of MnOx includes scanning and transmission electron microscopy, and X-ray photoelectron and K-edge Mn, Fe X-ray absorption spectroscopy. This characterisation reveals that the MnOx materials share the structural features of birnessite, yet differ in the degree of structural disorder. Importantly, these biogenic products exhibit strikingly different morphologies that can be easily controlled. Changing the substrate-to-protein ratio produces MnOx either as nm-thin sheets, or rods with diameters below 20 nm, or a combination of the two. Mineralisation in solutions that contain Fe2+(aq) makes solids with significant disorder in the structure, while the presence of Ca2+(aq) facilitates formation of more ordered materials. The (photo)oxidation and (photo)electrocatalytic capacity of the MnOx minerals is examined and correlated with their structural properties.
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Affiliation(s)
- Alexandr N Simonov
- School of Chemistry and the ARC Centre of Excellence for Electromaterials Science, Monash University, Victoria, 3800, Australia
| | - Rosalie K Hocking
- Discipline of Chemistry, College of Science and Engineering, James Cook University, Queensland, 4811, Australia
| | - Lizhi Tao
- Department of Chemistry, University of California, One Shields Avenue, Davis, California, 95616, USA
| | - Thomas Gengenbach
- Commonwealth Scientific and Industrial Research Organisation Manufacturing Flagship, Clayton, Victoria, 3168, Australia
| | - Timothy Williams
- Monash Centre for Electron Microscopy, Monash University, Victoria, 3800, Australia
| | - Xi-Ya Fang
- Monash Centre for Electron Microscopy, Monash University, Victoria, 3800, Australia
| | - Hannah J King
- Discipline of Chemistry, College of Science and Engineering, James Cook University, Queensland, 4811, Australia
| | - Shannon A Bonke
- School of Chemistry and the ARC Centre of Excellence for Electromaterials Science, Monash University, Victoria, 3800, Australia
| | - Dijon A Hoogeveen
- School of Chemistry and the ARC Centre of Excellence for Electromaterials Science, Monash University, Victoria, 3800, Australia
| | - Christine A Romano
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon, 97239, USA
| | - Bradley M Tebo
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon, 97239, USA
| | - Lisandra L Martin
- School of Chemistry and the ARC Centre of Excellence for Electromaterials Science, Monash University, Victoria, 3800, Australia
| | - William H Casey
- Department of Chemistry, University of California, One Shields Avenue, Davis, California, 95616, USA.,Department of Earth and Planetary Sciences, University of California, One Shields Avenue, Davis, California, 95616, USA
| | - Leone Spiccia
- School of Chemistry and the ARC Centre of Excellence for Electromaterials Science, Monash University, Victoria, 3800, Australia
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179
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Tao L, Simonov AN, Romano CA, Butterfield CN, Tebo BM, Bond AM, Spiccia L, Martin LL, Casey WH. Probing Electron Transfer in the Manganese‐Oxide‐Forming MnxEFG Protein Complex using Fourier Transformed AC Voltammetry: Understanding the Oxidative Priming Effect. ChemElectroChem 2017. [DOI: 10.1002/celc.201700563] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Lizhi Tao
- Department of Chemistry University of California One Shields Avenue Davis California 95616 United States
| | - Alexandr N. Simonov
- A School of Chemistry Monash University Victoria 3800 Australia
- ARC Centre of Excellence for Electromaterials Science Monash University Victoria 3800 Australia
| | - Christine A. Romano
- Division of Environmental and Biomolecular Systems Institute of Environmental Health Oregon Health & Science University Portland Oregon 97239 United States
| | - Cristina N. Butterfield
- Division of Environmental and Biomolecular Systems Institute of Environmental Health Oregon Health & Science University Portland Oregon 97239 United States
| | - Bradley M. Tebo
- Division of Environmental and Biomolecular Systems Institute of Environmental Health Oregon Health & Science University Portland Oregon 97239 United States
| | - Alan M. Bond
- A School of Chemistry Monash University Victoria 3800 Australia
- ARC Centre of Excellence for Electromaterials Science Monash University Victoria 3800 Australia
| | - Leone Spiccia
- A School of Chemistry Monash University Victoria 3800 Australia
- ARC Centre of Excellence for Electromaterials Science Monash University Victoria 3800 Australia
| | | | - William H. Casey
- Department of Chemistry University of California One Shields Avenue Davis California 95616 United States
- Department of Earth and Planetary Sciences University of California One Shields Avenue Davis California 95616 United States
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180
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Roy S, Bhattacharyya A, Herrero S, González-Prieto R, Frontera A, Chattopadhyay S. Accidental Orthogonality Induced Weak Magnetic Coupling in a Dinuclear Copper(II) Complex: Exploration of Unconventional C-H⋅⋅⋅π(SCN) Interactions and Catechol Oxidase Activity. ChemistrySelect 2017. [DOI: 10.1002/slct.201701016] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sourav Roy
- Department of Chemistry, Inorganic Section; Jadavpur University; Kolkata - 700032 India
| | - Anik Bhattacharyya
- Department of Chemistry, Inorganic Section; Jadavpur University; Kolkata - 700032 India
| | - Santiago Herrero
- Departamento de Química Inorgánica I, Facultad de Ciencias Químicas; Universidad Complutense de Madrid, Ciudad Universitaria; 28040 Madrid Spain
| | - Rodrigo González-Prieto
- Departamento de Química Inorgánica I, Facultad de Ciencias Químicas; Universidad Complutense de Madrid, Ciudad Universitaria; 28040 Madrid Spain
| | - Antonio Frontera
- Departament de Química; Universitat de les Illes Balears; Crta de Valldemossa km 7.5 07122 Palma de Mallorca (Baleares) Spain
| | - Shouvik Chattopadhyay
- Department of Chemistry, Inorganic Section; Jadavpur University; Kolkata - 700032 India
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181
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Layek S, Agrahari B, Tarafdar A, Kumari C, Anuradha, Ganguly R, Pathak DD. Synthesis, spectroscopic and single crystal X-ray studies on three new mononuclear Ni(II) pincer type complexes: DFT calculations and their antimicrobial activities. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.03.114] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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182
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Wang S, Deng W, Yang L, Tan Y, Xie Q, Yao S. Copper-Based Metal-Organic Framework Nanoparticles with Peroxidase-Like Activity for Sensitive Colorimetric Detection of Staphylococcus aureus. ACS APPLIED MATERIALS & INTERFACES 2017; 9:24440-24445. [PMID: 28691795 DOI: 10.1021/acsami.7b07307] [Citation(s) in RCA: 172] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cu-MOF nanoparticles with an average diameter of 550 nm were synthesized from 2-aminoterephthalic acid and Cu(NO3)2 by a mixed solvothermal method. The Cu-MOF nanoparticles can show peroxidase-like activity that can catalyze 3,3',5,5'-tetramethylbenzidine to produce a yellow chromogenic reaction in the presence of H2O2. The presence of abundant amine groups on the surfaces of Cu-MOF nanoparticles enables facile modification of Staphylococcus aureus (S. aureus) aptamer on Cu-MOF nanoparticles. By combining Cu-MOF-catalyzed chromogenic reaction with aptamer recognition and magnetic separation, a simple, sensitive, and selective colorimetric method for the detection of S. aureus was developed.
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Affiliation(s)
- Shuqin Wang
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University , Changsha 410081, China
| | - Wenfang Deng
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University , Changsha 410081, China
| | - Lu Yang
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University , Changsha 410081, China
| | - Yueming Tan
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University , Changsha 410081, China
| | - Qingji Xie
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University , Changsha 410081, China
| | - Shouzhuo Yao
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University , Changsha 410081, China
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183
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Manesis AC, O'Connor MJ, Schneider CR, Shafaat HS. Multielectron Chemistry within a Model Nickel Metalloprotein: Mechanistic Implications for Acetyl-CoA Synthase. J Am Chem Soc 2017; 139:10328-10338. [PMID: 28675928 DOI: 10.1021/jacs.7b03892] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The acetyl coenzyme A synthase (ACS) enzyme plays a central role in the metabolism of anaerobic bacteria and archaea, catalyzing the reversible synthesis of acetyl-CoA from CO and a methyl group through a series of nickel-based organometallic intermediates. Owing to the extreme complexity of the native enzyme systems, the mechanism by which this catalysis occurs remains poorly understood. In this work, we have developed a protein-based model for the NiP center of acetyl coenzyme A synthase using a nickel-substituted azurin protein (NiAz). NiAz is the first model nickel protein system capable of accessing three (NiI/NiII/NiIII) distinct oxidation states within a physiological potential range in aqueous solution, a critical feature for achieving organometallic ACS activity, and binds CO and -CH3 groups with biologically relevant affinity. Characterization of the NiI-CO species through spectroscopic and computational techniques reveals fundamentally similar features between the model NiAz system and the native ACS enzyme, highlighting the potential for related reactivity in this model protein. This work provides insight into the enzymatic process, with implications toward engineering biological catalysts for organometallic processes.
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Affiliation(s)
- Anastasia C Manesis
- The Ohio State University , 100 West 18th Avenue, Newman & Wolfrom Laboratory of Chemistry, Columbus, Ohio 43210, United States
| | - Matthew J O'Connor
- The Ohio State University , 100 West 18th Avenue, Newman & Wolfrom Laboratory of Chemistry, Columbus, Ohio 43210, United States
| | - Camille R Schneider
- The Ohio State University , 100 West 18th Avenue, Newman & Wolfrom Laboratory of Chemistry, Columbus, Ohio 43210, United States
| | - Hannah S Shafaat
- The Ohio State University , 100 West 18th Avenue, Newman & Wolfrom Laboratory of Chemistry, Columbus, Ohio 43210, United States
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184
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Witte M, Rohrmüller M, Gerstmann U, Henkel G, Schmidt WG, Herres-Pawlis S. [Cu 6 (NGuaS) 6 ] 2+ and its oxidized and reduced derivatives: Confining electrons on a torus. J Comput Chem 2017; 38:1752-1761. [PMID: 28394037 DOI: 10.1002/jcc.24798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 02/04/2017] [Accepted: 03/11/2017] [Indexed: 12/14/2022]
Abstract
The hexanuclear thioguanidine mixed-valent copper complex cation [Cu6 (NGuaS)6 ]+2 (NGuaS = o-SC6 H4 NC(NMe2 )2 ) and its oxidized/reduced states are theoretically analyzed by means of density functional theory (DFT) (TPSSh + D3BJ/def2-TZV (p)). A detailed bonding analysis using overlap populations is performed. We find that a delocalized Cu-based ring orbital serves as an acceptor for donated S p electrons. The formed fully delocalized orbitals give rise to a confined electron cloud within the Cu6 S6 cage which becomes larger on reduction. The resulting strong electrostatic repulsion might prevent the fully reduced state. Experimental UV/Vis spectra are explained using time-dependent density functional theory (TD-DFT) and analyzed with a natural transition orbital analysis. The spectra are dominated by MLCTs within the Cu6 S6 core over a wide range but LMCTs are also found. The experimental redshift of the reduced low energy absorption band can be explained by the clustering of the frontier orbitals. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Matthias Witte
- Lehrstuhl für Bioanorganische Chemie, Fachgruppe Chemie, RWTH Aachen University, Landoltweg 1, Aachen, 52074, Germany
| | - Martin Rohrmüller
- Lehrstuhl für Theoretische Physik, Universität Paderborn, Warburger Str. 100, Paderborn, 33098, Germany
| | - Uwe Gerstmann
- Lehrstuhl für Theoretische Physik, Universität Paderborn, Warburger Str. 100, Paderborn, 33098, Germany
| | - Gerald Henkel
- Lehrstuhl für Anorganische Chemie, Universität Paderborn, Warburger Str.100, Paderborn, 33098, Germany
| | - Wolf Gero Schmidt
- Lehrstuhl für Theoretische Physik, Universität Paderborn, Warburger Str. 100, Paderborn, 33098, Germany
| | - Sonja Herres-Pawlis
- Lehrstuhl für Bioanorganische Chemie, Fachgruppe Chemie, RWTH Aachen University, Landoltweg 1, Aachen, 52074, Germany
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185
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Rao G, Bansal S, Law WX, O’Dowd B, Dikanov SA, Oldfield E. Pulsed Electron Paramagnetic Resonance Insights into the Ligand Environment of Copper in Drosophila Lysyl Oxidase. Biochemistry 2017; 56:3770-3779. [DOI: 10.1021/acs.biochem.7b00308] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guodong Rao
- Department of Chemistry and ‡Department of Veterinary Clinical Medicine, University of Illinois, Urbana, Illinois 61801, United States
| | - Sandhya Bansal
- Department of Chemistry and ‡Department of Veterinary Clinical Medicine, University of Illinois, Urbana, Illinois 61801, United States
| | - Wen Xuan Law
- Department of Chemistry and ‡Department of Veterinary Clinical Medicine, University of Illinois, Urbana, Illinois 61801, United States
| | - Bing O’Dowd
- Department of Chemistry and ‡Department of Veterinary Clinical Medicine, University of Illinois, Urbana, Illinois 61801, United States
| | - Sergei A. Dikanov
- Department of Chemistry and ‡Department of Veterinary Clinical Medicine, University of Illinois, Urbana, Illinois 61801, United States
| | - Eric Oldfield
- Department of Chemistry and ‡Department of Veterinary Clinical Medicine, University of Illinois, Urbana, Illinois 61801, United States
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186
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Tao L, Stich TA, Liou SH, Soldatova AV, Delgadillo DA, Romano CA, Spiro TG, Goodin DB, Tebo BM, Casey WH, Britt RD. Copper Binding Sites in the Manganese-Oxidizing Mnx Protein Complex Investigated by Electron Paramagnetic Resonance Spectroscopy. J Am Chem Soc 2017; 139:8868-8877. [DOI: 10.1021/jacs.7b02277] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | | | | | - Alexandra V. Soldatova
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, United States
| | - David A. Delgadillo
- Department of Chemistry & Chemical Biology, University of California, 5200 North Lake Road, Merced, California 95343, United States
| | - Christine A. Romano
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon 97239, United States
| | - Thomas G. Spiro
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, United States
| | | | - Bradley M. Tebo
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon 97239, United States
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187
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Roger M, Sciara G, Biaso F, Lojou E, Wang X, Bauzan M, Giudici-Orticoni MT, Vila AJ, Ilbert M. Impact of copper ligand mutations on a cupredoxin with a green copper center. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017; 1858:351-359. [DOI: 10.1016/j.bbabio.2017.02.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 02/10/2017] [Accepted: 02/14/2017] [Indexed: 11/26/2022]
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188
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Paul A, Bertolasi V, Figuerola A, Manna SC. Structural and magnetic characterization of three tetranuclear Cu(II) complexes with face-sharing-dicubane/double-open-cubane like core framework. J SOLID STATE CHEM 2017. [DOI: 10.1016/j.jssc.2017.02.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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189
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Singh MK, Roy S, Hansda A, Kumar S, Kumar M, Kumar V, Peter SC, John RP. Synthesis, characterization and antibacterial activity evaluation of trinuclear Ni(II) complexes with N-substituted salicylhydrazide ligands. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.01.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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190
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Li M, Huang S, Cai Q, Xie Y. Spectroscopic investigation and in vitro cytotoxic activity toward HepG2 cells of a copper compound complexed with human serum albumin. LUMINESCENCE 2017; 32:888-898. [PMID: 28371207 DOI: 10.1002/bio.3272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 10/10/2016] [Accepted: 12/02/2016] [Indexed: 12/14/2022]
Abstract
The human serum albumin (HSA) interaction of a mixed-ligand copper compound (1) with an imidazole and taurine Schiff base derived from salicylaldehyde and taurine was investigated using fluorescence spectroscopy, UV-vis spectroscopy, time-resolved fluorescence spectroscopy, circular dichroism (CD) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and a molecular docking technique. The results of fluorescence and time-resolved fluorescence spectroscopy indicated that 1 can effectively quench the HSA fluorescence by a static mechanism. Binding constants (K) and the number of binding sites (n ≈ 1) were calculated using modified Stern-Volmer equations. The thermodynamic parameters were calculated. UV-vis, CD and FT-IR spectroscopy measurements confirm the alterations in the HSA secondary structure induced by 1. The site marker competitive experiment confirms that 1 is located in subdomain IB of HSA. The combination of molecular docking results and fluorescence experimental results reveal that hydrophobic interaction and hydrogen bonds are the predominant intermolecular forces stabilizing the 1-HSA complex. The 1-HSA complex increases approximately three times its cytotoxicity in cancer cells but has no effect on normal cells in vitro. Compared with unbound 1, the 1-HSA complex promotes HepG2 cells apoptosis and also has a stronger capacity for cell cycle arrest at the S phase of HepG2 cells.
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Affiliation(s)
- Mei Li
- Key Laboratory of Jiangxi University for Functional Material Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou, Jiangxi, China
| | - ShuJuan Huang
- Key Laboratory of Jiangxi University for Functional Material Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou, Jiangxi, China
| | - Qingyou Cai
- College of Mathematics and Computer Sciences, Gannan Normal University, Ganzhou, Jiangxi, China
| | - YongRong Xie
- Key Laboratory of Jiangxi University for Functional Material Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou, Jiangxi, China
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191
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Hollmann K, Oppermann A, Witte M, Li S, Amen M, Flörke U, Egold H, Henkel G, Herres-Pawlis S. Copper(I) Complexes with Thiourea Derivatives as Ligands: Revealing Secrets of Their Bonding Scheme. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601547] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Katharina Hollmann
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
| | - Alexander Oppermann
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
| | - Matthias Witte
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
| | - Sun Li
- Universität Paderborn; Warburger Str. 100 33098 Paderborn Germany
| | - Maike Amen
- Universität Paderborn; Warburger Str. 100 33098 Paderborn Germany
| | - Ulrich Flörke
- Universität Paderborn; Warburger Str. 100 33098 Paderborn Germany
| | - Hans Egold
- Universität Paderborn; Warburger Str. 100 33098 Paderborn Germany
| | - Gerald Henkel
- Universität Paderborn; Warburger Str. 100 33098 Paderborn Germany
| | - Sonja Herres-Pawlis
- RWTH Aachen University; Institut für Anorganische Chemie; Landoltweg 1 52074 Aachen Germany
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192
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Fukuda Y, Mizohata E, Inoue T. New molecular packing in a crystal of pseudoazurin from Alcaligenes faecalis: a double-helical arrangement of blue copper. Acta Crystallogr F Struct Biol Commun 2017; 73:159-166. [PMID: 28291752 PMCID: PMC5349310 DOI: 10.1107/s2053230x17002631] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 02/15/2017] [Indexed: 11/10/2022] Open
Abstract
Pseudoazurin from the denitrifying bacterium Alcaligenes faecalis (AfPAz) is a blue copper protein and functions as an electron donor to copper-containing nitrite reductase (CuNIR). Conventionally, AfPAz has been crystallized using highly concentrated ammonium sulfate as a precipitant. Here, a needle-like crystal of AfPAz grown in a solution containing a macromolecular precipitant, polyethylene glycol 8000 (PEG 8000), is reported. The crystal belonged to space group P61, with unit-cell parameters a = b = 68.7, c = 94.2 Å. The structure has been determined and refined at 2.6 Å resolution. The asymmetric unit contained two AfPAz molecules contacting each other on negatively charged surfaces. The molecular packing of the crystal showed a right-handed double-helical arrangement of AfPAz molecules and hence of blue copper sites. This structure provides insight into the excluded-volume effect of PEG and the manner of assembly of AfPAz.
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Affiliation(s)
- Yohta Fukuda
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Eiichi Mizohata
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Tsuyoshi Inoue
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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193
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Abstract
Metal ions play significant roles in numerous fields including chemistry, geochemistry, biochemistry, and materials science. With computational tools increasingly becoming important in chemical research, methods have emerged to effectively face the challenge of modeling metal ions in the gas, aqueous, and solid phases. Herein, we review both quantum and classical modeling strategies for metal ion-containing systems that have been developed over the past few decades. This Review focuses on classical metal ion modeling based on unpolarized models (including the nonbonded, bonded, cationic dummy atom, and combined models), polarizable models (e.g., the fluctuating charge, Drude oscillator, and the induced dipole models), the angular overlap model, and valence bond-based models. Quantum mechanical studies of metal ion-containing systems at the semiempirical, ab initio, and density functional levels of theory are reviewed as well with a particular focus on how these methods inform classical modeling efforts. Finally, conclusions and future prospects and directions are offered that will further enhance the classical modeling of metal ion-containing systems.
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Affiliation(s)
| | - Kenneth M. Merz
- Department of Chemistry, Department of Biochemistry and Molecular Biology, and Institute of Cyber-Enabled Research, Michigan State University, East Lansing, Michigan 48824, United States
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194
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Yu Y, Petrik ID, Chacón KN, Hosseinzadeh P, Chen H, Blackburn NJ, Lu Y. Effect of circular permutation on the structure and function of type 1 blue copper center in azurin. Protein Sci 2017; 26:218-226. [PMID: 27759897 PMCID: PMC5275729 DOI: 10.1002/pro.3071] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 10/13/2016] [Accepted: 10/14/2016] [Indexed: 11/10/2022]
Abstract
Type 1 copper (T1Cu) proteins are electron transfer (ET) proteins involved in many important biological processes. While the effects of changing primary and secondary coordination spheres in the T1Cu ET function have been extensively studied, few report has explored the effect of the overall protein structural perturbation on active site configuration or reduction potential of the protein, even though the protein scaffold has been proposed to play a critical role in enforcing the entatic or "rack-induced" state for ET functions. We herein report circular permutation of azurin by linking the N- and C-termini and creating new termini in the loops between 1st and 2nd β strands or between 3rd and 4th β strands. Characterization by electronic absorption, electron paramagnetic spectroscopies, as well as crystallography and cyclic voltammetry revealed that, while the overall structure and the primary coordination sphere of the circular permutated azurins remain the same as those of native azurin, their reduction potentials increased by 18 and 124 mV over that of WTAz. Such increases in reduction potentials can be attributed to subtle differences in the hydrogen-bonding network in secondary coordination sphere around the T1Cu center.
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Affiliation(s)
- Yang Yu
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of SciencesTianjin300308China
| | - Igor D. Petrik
- Department of Chemistry, University of Illinois at Urbana‐ChampaignUrbanaIllinois61801
| | | | - Parisa Hosseinzadeh
- Department of BiochemistryUniversity of Illinois at Urbana‐ChampaignUrbanaIllinois61801
| | - Honghui Chen
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of SciencesTianjin300308China
- Tianjin University of Science and TechnologyTianjin300457China
| | - Ninian J. Blackburn
- Institute of Environmental Health, Oregon Health and Science UniversityPortlandOregon97239
| | - Yi Lu
- Department of Chemistry, University of Illinois at Urbana‐ChampaignUrbanaIllinois61801
- Department of BiochemistryUniversity of Illinois at Urbana‐ChampaignUrbanaIllinois61801
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195
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Muthuramalingam S, Subramaniyan S, Khamrang T, Velusamy M, Mayilmurugan R. Copper(II)-Bioinspired Models for Copper Amine Oxidases: Oxidative Half-Reaction in Water. ChemistrySelect 2017. [DOI: 10.1002/slct.201601786] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sethuraman Muthuramalingam
- Bioinorganic Chemistry Laboratory/Physical Chemistry; School of Chemistry; Madurai Kamaraj University; Madurai 625 021, Tamil Nadu India
| | - Shanmugam Subramaniyan
- Bioinorganic Chemistry Laboratory/Physical Chemistry; School of Chemistry; Madurai Kamaraj University; Madurai 625 021, Tamil Nadu India
| | - Themmila Khamrang
- Department of Chemistry; North Eastern Hill Universuty; Shillong- 793022 India
| | - Marappan Velusamy
- Department of Chemistry; North Eastern Hill Universuty; Shillong- 793022 India
| | - Ramasamy Mayilmurugan
- Bioinorganic Chemistry Laboratory/Physical Chemistry; School of Chemistry; Madurai Kamaraj University; Madurai 625 021, Tamil Nadu India
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196
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Asatkar AK, Tripathi M, Panda S, Pande R, Zade SS. Cu(I) complexes of bis(methyl)(thia/selena) salen ligands: Synthesis, characterization, redox behavior and DNA binding studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 171:18-24. [PMID: 27458761 DOI: 10.1016/j.saa.2016.07.029] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Accepted: 07/16/2016] [Indexed: 06/06/2023]
Abstract
Mononuclear cuprous complexes 1 and 2, [{CH3E(o-C6H4)CH=NCH2}2Cu]ClO4; E=S/Se, have been synthesized by the reaction of bis(methyl)(thia/selena) salen ligands and [Cu(CH3CN)4]ClO4. Both the products were characterized by elemental analysis, ESI-MS, FT-IR, 1H/13C/77Se NMR, and cyclic voltammetry. The complexes possess tetrahedral geometry around metal center with the N2S2/N2Se2 coordination core. Cyclic voltammograms of complexes 1 and 2 displayed reversible anodic waves at E1/2=+0.08V and +0.10V, respectively, corresponding to the Cu(I)/Cu(II) redox couple. DNA binding studies of both the complexes were performed applying absorbance, fluorescence and molecular docking techniques. Competitive binding experiment of complexes with ct-DNA against ethidium bromide is performed to predict the mode of binding. The results indicate the groove binding mode of complexes 1 and 2 to DNA. The binding constants revealed the strong binding affinity of complexes towards ct-DNA.
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Affiliation(s)
- Ashish K Asatkar
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur, 741252 Nadia, WB, India.
| | - Mamta Tripathi
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur 492010, India
| | - Snigdha Panda
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur, 741252 Nadia, WB, India
| | - Rama Pande
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur 492010, India
| | - Sanjio S Zade
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur, 741252 Nadia, WB, India
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197
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Eckert PA, Kubarych KJ. Dynamic Flexibility of Hydrogenase Active Site Models Studied with 2D-IR Spectroscopy. J Phys Chem A 2017; 121:608-615. [PMID: 28032999 DOI: 10.1021/acs.jpca.6b11962] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Hydrogenase enzymes enable organisms to use H2 as an energy source, having evolved extremely efficient biological catalysts for the reversible oxidation of molecular hydrogen. Small-molecule mimics of these enzymes provide both simplified models of the catalysis reactions and potential artificial catalysts that might be used to facilitate a hydrogen economy. We have studied two diiron hydrogenase mimics, μ-pdt-[Fe(CO)3]2 and μ-edt-[Fe(CO)3]2 (pdt = propanedithiolate, edt = ethanedithiolate), in a series of alkane solvents and have observed significant ultrafast spectral dynamics using two-dimensional infrared (2D-IR) spectroscopy. Since solvent fluctuations in nonpolar alkanes do not lead to substantial electrostatic modulations in a solute's vibrational mode frequencies, we attribute the spectral diffusion dynamics to intramolecular flexibility. The intramolecular origin is supported by the absence of any measurable solvent viscosity dependence, indicating that the frequency fluctuations are not coupled to the solvent motional dynamics. Quantum chemical calculations reveal a pronounced coupling between the low-frequency torsional rotation of the carbonyl ligands and the terminal CO stretching vibrations. The flexibility of the CO ligands has been proposed to play a central role in the catalytic reaction mechanism, and our results highlight that the CO ligands are highly flexible on a picosecond time scale.
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Affiliation(s)
- Peter A Eckert
- Department of Chemistry, University of Michigan , 930 N. University Ave., Ann Arbor, Michigan 48109, United States
| | - Kevin J Kubarych
- Department of Chemistry, University of Michigan , 930 N. University Ave., Ann Arbor, Michigan 48109, United States
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198
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Pallares IG, Moore TC, Escalante-Semerena JC, Brunold TC. Spectroscopic Studies of the EutT Adenosyltransferase from Salmonella enterica: Evidence of a Tetrahedrally Coordinated Divalent Transition Metal Cofactor with Cysteine Ligation. Biochemistry 2017; 56:364-375. [PMID: 28045498 DOI: 10.1021/acs.biochem.6b00750] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The EutT enzyme from Salmonella enterica, a member of the family of ATP:cobalt(I) corrinoid adenosyltransferase (ACAT) enzymes, requires a divalent transition metal ion for catalysis, with Fe(II) yielding the highest activity. EutT contains a unique cysteine-rich HX11CCX2C(83) motif (where H and the last C occupy the 67th and 83rd positions, respectively, in the amino acid sequence) not found in other ACATs and employs an unprecedented mechanism for the formation of adenosylcobalamin. Recent kinetic and spectroscopic studies of this enzyme revealed that residues in the HX11CCX2C(83) motif are required for the tight binding of the divalent metal ion and are critical for the formation of a four-coordinate (4c) cob(II)alamin [Co(II)Cbl] intermediate in the catalytic cycle. However, it remained unknown which, if any, of the residues in the HX11CCX2C(83) motif bind the divalent metal ion. To address this issue, we have characterized Co(II)-substituted wild-type EutT (EutTWT/Co) by using electronic absorption, electron paramagnetic resonance, and magnetic circular dichroism (MCD) spectroscopies. Our results indicate that the reduced catalytic activity of EutTWT/Co relative to that of the Fe(II)-containing enzyme arises from the incomplete incorporation of Co(II) ions and, thus, a decrease in the relative population of 4c Co(II)Cbl. Our MCD data for EutTWT/Co also reveal that the Co(II) ions reside in a distorted tetrahedral coordination environment with direct cysteine sulfur ligation. Additional spectroscopic studies of EutT/Co variants possessing a single alanine substitution of either His67, His75, Cys79, Cys80, or Cys83 indicate that Cys80 coordinates to the Co(II) ion, while the additional residues are important for maintaining the structural integrity and/or high affinity of the metal binding site.
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Affiliation(s)
- Ivan G Pallares
- Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States
| | - Theodore C Moore
- Department of Microbiology, University of Georgia , Athens, Georgia 30602, United States
| | | | - Thomas C Brunold
- Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States
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199
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Chen H, Su B, Zhang T, Huang A, Liu H, Yu Y, Wang J. Engineering the metal-binding loop at a type 1 copper center by circular permutation. RSC Adv 2017. [DOI: 10.1039/c7ra11512a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Circular permutation of the cupredoxin azurin creates a break on the metal binding loop, highlighting the loop's flexibility.
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Affiliation(s)
- Honghui Chen
- College of Biotechnology
- Tianjin University of Science and Technology
- Tianjin
- China
- Tianjin Institute of Industrial Biotechnology
| | - Binbin Su
- College of Biotechnology
- Tianjin University of Science and Technology
- Tianjin
- China
- Tianjin Institute of Industrial Biotechnology
| | - Tongtong Zhang
- Tianjin Institute of Industrial Biotechnology
- Chinese Academy of Sciences
- Tianjin
- China
| | - Aiping Huang
- Tianjin Institute of Industrial Biotechnology
- Chinese Academy of Sciences
- Tianjin
- China
| | - Haiping Liu
- Tianjin Institute of Industrial Biotechnology
- Chinese Academy of Sciences
- Tianjin
- China
| | - Yang Yu
- Tianjin Institute of Industrial Biotechnology
- Chinese Academy of Sciences
- Tianjin
- China
| | - Jiangyun Wang
- Laboratory of RNA Biology
- Institute of Biophysics
- Chinese Academy of Sciences
- Beijing
- China
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200
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Vilhena FS, Felcman J, Szpoganicz B, Miranda FS. Potentiometric and DFT studies of Cu(II) complexes with glycylglycine and methionine of interest for the brain chemistry. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.07.073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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