1
|
Yao N, Jia H, Zhu J, Shi Z, Cong H, Ge J, Luo W. Atomically dispersed Ru oxide catalyst with lattice oxygen participation for efficient acidic water oxidation. Chem 2023. [DOI: 10.1016/j.chempr.2023.03.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
|
2
|
Metal single-site catalyst design for electrocatalytic production of hydrogen peroxide at industrial-relevant currents. Nat Commun 2023; 14:172. [PMID: 36635287 PMCID: PMC9837053 DOI: 10.1038/s41467-023-35839-z] [Citation(s) in RCA: 40] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Accepted: 01/03/2023] [Indexed: 01/14/2023] Open
Abstract
Direct hydrogen peroxide (H2O2) electrosynthesis via the two-electron oxygen reduction reaction is a sustainable alternative to the traditional energy-intensive anthraquinone technology. However, high-performance and scalable electrocatalysts with industrial-relevant production rates remain to be challenging, partially due to insufficient atomic level understanding in catalyst design. Here we utilize theoretical approaches to identify transition-metal single-site catalysts for two-electron oxygen reduction using the *OOH binding energy as a descriptor. The theoretical predictions are then used as guidance to synthesize the desired cobalt single-site catalyst with a O-modified Co-(pyrrolic N)4 configuration that can achieve industrial-relevant current densities up to 300 mA cm-2 with 96-100% Faradaic efficiencies for H2O2 production at a record rate of 11,527 mmol h-1 gcat-1. Here, we show the feasibility and versatility of metal single-site catalyst design using various commercial carbon and cobalt phthalocyanine as starting materials and the high applicability for H2O2 electrosynthesis in acidic, neutral and alkaline electrolytes.
Collapse
|
3
|
Goodwin KD, Lewis MA, Long EC, Georgiadis MM. Two distinct rotations of bithiazole DNA intercalation revealed by direct comparison of crystal structures of Co(III)•bleomycin A 2 and B 2 bound to duplex 5'-TAGTT sites. Bioorg Med Chem 2023; 77:117113. [PMID: 36516684 DOI: 10.1016/j.bmc.2022.117113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 11/23/2022] [Accepted: 11/28/2022] [Indexed: 12/12/2022]
Abstract
Bleomycins constitute a family of anticancer natural products that bind DNA through intercalation of a C-terminal tail/bithiazole moiety and hydrogen-bonding interactions between the remainder of the drug and the minor groove. The clinical utility of the bleomycins is believed to result from single- and double-strand DNA cleavage mediated by the HOO-Fe(III) form of the drug. The bleomycins also serve as a model system to understand the nature of complex drug-DNA interactions that may guide future DNA-targeted drug discovery. In this study, the impact of the C-terminal tail on bleomycin-DNA interactions was investigated. Toward this goal, we determined two crystal structures of HOO-Co(III)•BLMA2 "green" (a stable structural analogue of the active HOO-Fe(III) drug) bound to duplex DNA containing 5'-TAGTT, one in which the entire drug is bound (fully bound) and a second with only the C-terminal tail/bithiazole bound (partially bound). The structures reported here were captured by soaking HOO-Co(III)•BLMA2 into preformed host-guest crystals including a preferred DNA-binding site. While the overall structure of DNA-bound BLMA2 was found to be similar to those reported earlier at the same DNA site for BLMB2, the intercalated bithiazole of BLMB2 is "flipped" 180˚ relative to DNA-bound BLMA2. This finding highlights an unidentified role for the C-terminal tail in directing the intercalation of the bithiazole. In addition, these analyses identified specific bond rotations within the C-terminal domain of the drug that may be relevant for its reorganization and ability to carry out a double-strand DNA cleavage event.
Collapse
Affiliation(s)
- Kristie D Goodwin
- Department of Biochemistry & Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Mark A Lewis
- Department of Chemistry & Chemical Biology, Indiana University-Indianapolis (IUPUI), 402 North Blackford Street, Indianapolis, IN 46202, USA
| | - Eric C Long
- Department of Chemistry & Chemical Biology, Indiana University-Indianapolis (IUPUI), 402 North Blackford Street, Indianapolis, IN 46202, USA.
| | - Millie M Georgiadis
- Department of Biochemistry & Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
| |
Collapse
|
4
|
Voltammetric Quantification of Anti-Cancer Antibiotic Bleomycin Using an Electrochemically Pretreated and Decorated with Lead Nanoparticles Screen-Printed Sensor. Int J Mol Sci 2022; 24:ijms24010472. [PMID: 36613924 PMCID: PMC9820353 DOI: 10.3390/ijms24010472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/16/2022] [Accepted: 12/20/2022] [Indexed: 12/29/2022] Open
Abstract
In this paper, we report a highly sensitive voltammetric sensor for the determination of the anti-cancer antibiotic bleomycin (BLM) based on a screen-printed carbon sensor that is electrochemically pretreated and decorated with lead nanoparticles in the sample solution (pSPCE/PbNPs). These sensor surface manipulations contribute to significant amplification of the analytical signal and improvement of its shape and repeatability. The effect of the electrochemical behavior of BLM on the pSPCE/PbNPs was examined by electrochemical strategies. CV, EIS, and XPS were used to compare the sensor surface modifications. The effects of the type and pH of the supporting electrolyte and the procedure parameters were optimized. The features of the proposed procedure include: (a) very low limits of detection and quantification (2.8 × 10-11 and 9.3 × 10-11 M, respectively), (b) linear ranges (1.0 × 10-10-2.0 × 10-9 M and 2.0 × 10-9-2.0 × 10-8 M, and (c) a high sensitivity of 0.32 µA/nM. The electrochemical sensor was successfully applied for the determination of BLM in wastewater and reference material of human urine samples.
Collapse
|
5
|
Yang X, Wu W, Chen X, Wu F, Fan S, Yu P, Mao L. A versatile artificial metalloenzyme scaffold enabling direct bioelectrocatalysis in solution. SCIENCE ADVANCES 2022; 8:eabo3315. [PMID: 36322668 PMCID: PMC9629707 DOI: 10.1126/sciadv.abo3315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 09/13/2022] [Indexed: 06/16/2023]
Abstract
Artificial metalloenzymes (ArMs) are commonly designed with protein scaffolds containing buried coordination pockets to achieve substrate specificity and product selectivity for homogeneous reactions. However, their reactivities toward heterogeneous transformations are limited because interfacial electron transfers are hampered by the backbone shells. Here, we introduce bacterial small laccase (SLAC) as a new protein scaffold for constructing ArMs to directly catalyze electrochemical transformations. We use molecular dynamics simulation, x-ray crystallography, spectroscopy, and computation to illustrate the scaffold-directed assembly of an oxo-bridged dicobalt motif on protein surface. The resulting ArM in aqueous phase catalyzes electrochemical water oxidation without mediators or electrode modifications. Mechanistic investigation reveals the role of SLAC scaffold in defining the four-electron transfer pathway from water to oxygen. Furthermore, we demonstrate that SLAC-based ArMs implemented with Ni2+, Mn2+, Ru3+, Pd2+, or Ir3+ also enable direct bioelectrocatalysis of water electrolysis. Our study provides a versatile and generalizable route to complement heterogeneous repertoire of ArMs for expanded applications.
Collapse
Affiliation(s)
- Xiaoti Yang
- Beijing National Laboratory for Molecular Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenjie Wu
- Beijing National Laboratory for Molecular Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiling Chen
- Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Fei Wu
- Beijing National Laboratory for Molecular Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shilong Fan
- Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Ping Yu
- Beijing National Laboratory for Molecular Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lanqun Mao
- Beijing National Laboratory for Molecular Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| |
Collapse
|
6
|
Spectroscopically clean Au nanoparticles for catalytic decomposition of hydrogen peroxide. Sci Rep 2021; 11:9709. [PMID: 33958687 PMCID: PMC8102470 DOI: 10.1038/s41598-021-89235-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 04/16/2021] [Indexed: 11/25/2022] Open
Abstract
Au nanoparticles synthesized from colloidal techniques have the capability in many applications such as catalysis and sensing. Au nanoparticles function as both catalyst and highly sensitive SERS probe can be employed for sustainable and green catalytic process. However, capping ligands that are necessary to stabilize nanoparticles during synthesis are negative for catalytic activity. In this work, a simple effective mild thermal treatment to remove capping ligands meanwhile preserving the high SERS sensitivity of Au nanoparticles is reported. We show that under the optimal treatment conditions (250 °C for 2 h), 50 nm Au nanoparticles surfaces are free from any capping molecules. The catalytic activity of treated Au nanoparticles is studied through H2O2 decomposition, which proves that the treatment is favorable for catalytic performance improvement. A reaction intermediate during H2O2 decomposition is observed and identified.
Collapse
|
7
|
Jiang M, Fu C, Cheng R, Zhang W, Liu T, Wang R, Zhang J, Sun B. Integrated and Binder-Free Air Cathodes of Co 3 Fe 7 Nanoalloy and Co 5.47 N Encapsulated in Nitrogen-Doped Carbon Foam with Superior Oxygen Reduction Activity in Flexible Aluminum-Air Batteries. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:e2000747. [PMID: 34437770 PMCID: PMC7509645 DOI: 10.1002/advs.202000747] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 06/22/2020] [Indexed: 05/14/2023]
Abstract
All-solid-sate Al-air batteries with features of high theoretical energy density, low cost, and environmental-friendliness are promising as power sources for next-generation flexible and wearable electronics. However, the sluggish oxygen reduction reaction (ORR) and poor interfacial contact in air cathodes cause unsatisfied performance. Herein, a free-standing Co3 Fe7 nanoalloy and Co5.47 N encapsulated in 3D nitrogen-doped carbon foam (Co3 Fe7 @Co5.47 N/NCF) is prepared as an additive-free and integrated air cathode for flexible Al-air batteries in both alkaline and neutral electrolytes. The Co3 Fe7 @Co5.47 N/NCF outperforms commercial platinum/carbon (Pt/C) toward ORR with an onset potential of 1.02 V and a positive half-wave potential of 0.92 V in an alkaline electrolyte (0.59 V in sodium chloride solution), which is ascribed to the unique interfacial structure between Co3 Fe7 and Co5.47 N supported by 3D N-doped carbon foam to facilitate fast electron and mass transfer. The high ORR performance is also supported by in-situ electrochemical Raman spectra and density functional theory calculation. Furthermore, the fabricated Al-air battery displays good flexibility and delivers a power density of 199.6 mW cm-2 , and the binder-free and integrated cathode shows better discharge performance than the traditionally slurry casting cathode. This work demonstrates a facile and efficient approach to develop integrated air cathode for metal-air batteries.
Collapse
Affiliation(s)
- Min Jiang
- School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240P. R. China
| | - Chaopeng Fu
- School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240P. R. China
| | - Ruiqi Cheng
- School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240P. R. China
| | - Wei Zhang
- Advanced Technology InstituteUniversity of SurreyGuildfordGU2 7XHUK
| | - Tongyao Liu
- School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240P. R. China
| | - Ruibin Wang
- Instrumental Analysis Center of SJTUShanghai Jiao Tong UniversityShanghai200240P. R. China
| | - Jiao Zhang
- School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240P. R. China
| | - Baode Sun
- School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240P. R. China
| |
Collapse
|
8
|
Anandababu K, Muthuramalingam S, Velusamy M, Mayilmurugan R. Single-step benzene hydroxylation by cobalt(ii) catalysts via a cobalt(iii)-hydroperoxo intermediate. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02601k] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Cobalt(ii) complexes reported as efficient and selective catalysts for single-step phenol formation from benzene using H2O2. The catalysis proceeds likely via cobalt(iii)-hydroperoxo species.
Collapse
Affiliation(s)
- Karunanithi Anandababu
- Bioinorganic Chemistry Laboratory/Physical Chemistry
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625021
- India
| | - Sethuraman Muthuramalingam
- Bioinorganic Chemistry Laboratory/Physical Chemistry
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625021
- India
| | - Marappan Velusamy
- Department of Chemistry
- North Eastern Hill University
- Shillong-793022
- India
| | - Ramasamy Mayilmurugan
- Bioinorganic Chemistry Laboratory/Physical Chemistry
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625021
- India
| |
Collapse
|
9
|
Guo Z, Xie Y, Xiao J, Zhao ZJ, Wang Y, Xu Z, Zhang Y, Yin L, Cao H, Gong J. Single-Atom Mn–N4 Site-Catalyzed Peroxone Reaction for the Efficient Production of Hydroxyl Radicals in an Acidic Solution. J Am Chem Soc 2019; 141:12005-12010. [DOI: 10.1021/jacs.9b04569] [Citation(s) in RCA: 125] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Zhuang Guo
- Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yongbing Xie
- Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China
| | - Jiadong Xiao
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, David de Wiedgebouw, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Zhi-Jian Zhao
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering & Technology, Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Yuxian Wang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, China
| | - Zhaomeng Xu
- Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yi Zhang
- Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China
| | - Lichang Yin
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
| | - Hongbin Cao
- Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China
| | - Jinlong Gong
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering & Technology, Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| |
Collapse
|
10
|
Nishiura T, Chiba Y, Nakazawa J, Hikichi S. Tuning the O2 Binding Affinity of Cobalt(II) Centers by Changing the Structural and Electronic Properties of the Distal Substituents on Azole-Based Chelating Ligands. Inorg Chem 2018; 57:14218-14229. [DOI: 10.1021/acs.inorgchem.8b02241] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Toshiki Nishiura
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Yosuke Chiba
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Jun Nakazawa
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| | - Shiro Hikichi
- Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
| |
Collapse
|
11
|
Yiliguma, Xu W, Wang Z, Shang L, Zhang H, Al-Enizi AM, Tang Y, Zheng G. Unconventional morphologies of CoO nanocrystals via controlled oxidation of cobalt oleate precursors. Chem Commun (Camb) 2018; 54:3867-3870. [PMID: 29594293 DOI: 10.1039/c8cc01060a] [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
We report an 'oxidation state' regulating method for the synthesis of anisotropic wurtzite CoO nanocrytals (NCs) with various shapes, including ultrathin nanosheets and a core-antenna structure for the first time. We show that the decomposition process of precursors was altered by their oxidation, which played a significant role in the unconventional growth.
Collapse
Affiliation(s)
- Yiliguma
- Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China.
| | - Wenhao Xu
- Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China.
| | - Zhijie Wang
- Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China.
| | - Longmei Shang
- Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China.
| | - Hui Zhang
- Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China.
| | - Abdullah M Al-Enizi
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Yun Tang
- Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China.
| | - Gengfeng Zheng
- Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China.
| |
Collapse
|
12
|
Mak PJ, Denisov IG. Spectroscopic studies of the cytochrome P450 reaction mechanisms. BIOCHIMICA ET BIOPHYSICA ACTA. PROTEINS AND PROTEOMICS 2018; 1866:178-204. [PMID: 28668640 PMCID: PMC5709052 DOI: 10.1016/j.bbapap.2017.06.021] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 06/22/2017] [Indexed: 10/19/2022]
Abstract
The cytochrome P450 monooxygenases (P450s) are thiolate heme proteins that can, often under physiological conditions, catalyze many distinct oxidative transformations on a wide variety of molecules, including relatively simple alkanes or fatty acids, as well as more complex compounds such as steroids and exogenous pollutants. They perform such impressive chemistry utilizing a sophisticated catalytic cycle that involves a series of consecutive chemical transformations of heme prosthetic group. Each of these steps provides a unique spectral signature that reflects changes in oxidation or spin states, deformation of the porphyrin ring or alteration of dioxygen moieties. For a long time, the focus of cytochrome P450 research was to understand the underlying reaction mechanism of each enzymatic step, with the biggest challenge being identification and characterization of the powerful oxidizing intermediates. Spectroscopic methods, such as electronic absorption (UV-Vis), electron paramagnetic resonance (EPR), nuclear magnetic resonance (NMR), electron nuclear double resonance (ENDOR), Mössbauer, X-ray absorption (XAS), and resonance Raman (rR), have been useful tools in providing multifaceted and detailed mechanistic insights into the biophysics and biochemistry of these fascinating enzymes. The combination of spectroscopic techniques with novel approaches, such as cryoreduction and Nanodisc technology, allowed for generation, trapping and characterizing long sought transient intermediates, a task that has been difficult to achieve using other methods. Results obtained from the UV-Vis, rR and EPR spectroscopies are the main focus of this review, while the remaining spectroscopic techniques are briefly summarized. This article is part of a Special Issue entitled: Cytochrome P450 biodiversity and biotechnology, edited by Erika Plettner, Gianfranco Gilardi, Luet Wong, Vlada Urlacher, Jared Goldstone.
Collapse
Affiliation(s)
- Piotr J Mak
- Department of Chemistry, Saint Louis University, St. Louis, MO, United States.
| | - Ilia G Denisov
- Department of Biochemistry, University of Illinois Urbana-Champaign, Urbana, IL, United States.
| |
Collapse
|
13
|
Deng Y, Yeo BS. Characterization of Electrocatalytic Water Splitting and CO2 Reduction Reactions Using In Situ/Operando Raman Spectroscopy. ACS Catal 2017. [DOI: 10.1021/acscatal.7b02561] [Citation(s) in RCA: 133] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yilin Deng
- Department
of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Boon Siang Yeo
- Department
of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore 117543
- Solar
Energy Research Institute of Singapore, National University of Singapore, 7 Engineering Drive 1, Singapore 117574
| |
Collapse
|
14
|
Gimbert-Suriñach C, Moonshiram D, Francàs L, Planas N, Bernales V, Bozoglian F, Guda A, Mognon L, López I, Hoque MA, Gagliardi L, Cramer CJ, Llobet A. Structural and Spectroscopic Characterization of Reaction Intermediates Involved in a Dinuclear Co–Hbpp Water Oxidation Catalyst. J Am Chem Soc 2016; 138:15291-15294. [DOI: 10.1021/jacs.6b08532] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Carolina Gimbert-Suriñach
- Institute
of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Dooshaye Moonshiram
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
| | - Laia Francàs
- Institute
of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Nora Planas
- Department
of Chemistry, Supercomputing Institute and Chemical Theory Center, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Varinia Bernales
- Department
of Chemistry, Supercomputing Institute and Chemical Theory Center, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Fernando Bozoglian
- Institute
of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Alexander Guda
- International
Research Center “Smart Materials”, Southern Federal University, 344090 Rostov-on-Don, Russia
| | - Lorenzo Mognon
- Institute
of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Isidoro López
- Institute
of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Md Asmaul Hoque
- Institute
of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Laura Gagliardi
- Department
of Chemistry, Supercomputing Institute and Chemical Theory Center, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Christopher J. Cramer
- Department
of Chemistry, Supercomputing Institute and Chemical Theory Center, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Antoni Llobet
- Institute
of Chemical Research of Catalonia (ICIQ), Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, 43007 Tarragona, Spain
- Departament
de Química, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
| |
Collapse
|
15
|
Shin B, Sutherlin KD, Ohta T, Ogura T, Solomon EI, Cho J. Reactivity of a Cobalt(III)-Hydroperoxo Complex in Electrophilic Reactions. Inorg Chem 2016; 55:12391-12399. [PMID: 27934432 DOI: 10.1021/acs.inorgchem.6b02288] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reactivity of mononuclear metal-hydroperoxo adducts has fascinated researchers in many areas due to their diverse biological and catalytic processes. In this study, a mononuclear cobalt(III)-peroxo complex bearing a tetradentate macrocyclic ligand, [CoIII(Me3-TPADP)(O2)]+ (Me3-TPADP = 3,6,9-trimethyl-3,6,9-triaza-1(2,6)-pyridinacyclodecaphane), was prepared by reacting [CoII(Me3-TPADP)(CH3CN)2]2+ with H2O2 in the presence of triethylamine. Upon protonation, the cobalt(III)-peroxo intermediate was converted into a cobalt(III)-hydroperoxo complex, [CoIII(Me3-TPADP)(O2H)(CH3CN)]2+. The mononuclear cobalt(III)-peroxo and -hydroperoxo intermediates were characterized by a variety of physicochemical methods. Results of electrospray ionization mass spectrometry clearly show the transformation of the intermediates: the peak at m/z 339.2 assignable to the cobalt(III)-peroxo species disappears with concomitant growth of the peak at m/z 190.7 corresponding to the cobalt(III)-hydroperoxo complex (with bound CH3CN). Isotope labeling experiments further support the existence of the cobalt(III)-peroxo and -hydroperoxo complexes. In particular, the O-O bond stretching frequency of the cobalt(III)-hydroperoxo complex was determined to be 851 cm-1 for 16O2H samples (803 cm-1 for 18O2H samples), and its Co-O vibrational energy was observed at 571 cm-1 for 16O2H samples (551 cm-1 for 18O2H samples; 568 cm-1 for 16O22H samples) by resonance Raman spectroscopy. Reactivity studies performed with the cobalt(III)-peroxo and -hydroperoxo complexes in organic functionalizations reveal that the latter is capable of conducting oxygen atom transfer with an electrophilic character, whereas the former exhibits no oxygen atom transfer reactivity under the same reaction conditions. Alternatively, the cobalt(III)-hydroperoxo complex does not perform hydrogen atom transfer reactions, while analogous low-spin Fe(III)-hydroperoxo complexes are capable of this reactivity. Density functional theory calculations indicate that this lack of reactivity is due to the high free energy cost of O-O bond homolysis that would be required to produce the hypothetical Co(IV)-oxo product.
Collapse
Affiliation(s)
- Bongki Shin
- Department of Emerging Materials Science, DGIST , Daegu 42988, Korea
| | - Kyle D Sutherlin
- Department of Chemistry, Stanford University , Stanford, California 94305, United States
| | - Takehiro Ohta
- Picobiology Institute, Graduate School of Life Science, University of Hyogo , RSC-UH LP Center, Hyogo 679-5148, Japan
| | - Takashi Ogura
- Picobiology Institute, Graduate School of Life Science, University of Hyogo , RSC-UH LP Center, Hyogo 679-5148, Japan
| | - Edward I Solomon
- Department of Chemistry, Stanford University , Stanford, California 94305, United States.,Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center , Menlo Park, California 94025, United States
| | - Jaeheung Cho
- Department of Emerging Materials Science, DGIST , Daegu 42988, Korea
| |
Collapse
|
16
|
Wang CC, Chang HC, Lai YC, Fang H, Li CC, Hsu HK, Li ZY, Lin TS, Kuo TS, Neese F, Ye S, Chiang YW, Tsai ML, Liaw WF, Lee WZ. A Structurally Characterized Nonheme Cobalt–Hydroperoxo Complex Derived from Its Superoxo Intermediate via Hydrogen Atom Abstraction. J Am Chem Soc 2016; 138:14186-14189. [DOI: 10.1021/jacs.6b08642] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chun-Chieh Wang
- Department
of Chemistry and Instrumentation Center, National Taiwan Normal University, Taipei 11677, Taiwan
- Department
of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Hao-Ching Chang
- Department
of Chemistry and Instrumentation Center, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Yei-Chen Lai
- Department
of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Huayi Fang
- Max-Planck Institut für Chemische Energiekonversion, Mülheim an der Ruhr D-45470, Germany
| | - Chieh-Chin Li
- Department
of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Hung-Kai Hsu
- Department
of Chemistry and Instrumentation Center, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Zong-Yan Li
- Department
of Chemistry and Instrumentation Center, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Tien-Sung Lin
- Department
of Chemistry, Washington University, St. Louis, Missouri 63130, United States
| | - Ting-Shen Kuo
- Department
of Chemistry and Instrumentation Center, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Frank Neese
- Max-Planck Institut für Chemische Energiekonversion, Mülheim an der Ruhr D-45470, Germany
| | - Shengfa Ye
- Max-Planck Institut für Chemische Energiekonversion, Mülheim an der Ruhr D-45470, Germany
| | - Yun-Wei Chiang
- Department
of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Ming-Li Tsai
- Department
of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Wen-Feng Liaw
- Department
of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Way-Zen Lee
- Department
of Chemistry and Instrumentation Center, National Taiwan Normal University, Taipei 11677, Taiwan
| |
Collapse
|
17
|
Time-resolved observations of water oxidation intermediates on a cobalt oxide nanoparticle catalyst. Nat Chem 2014; 6:362-7. [DOI: 10.1038/nchem.1874] [Citation(s) in RCA: 584] [Impact Index Per Article: 58.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2013] [Accepted: 01/14/2014] [Indexed: 12/22/2022]
|
18
|
Kim JA, Kim S, Lee J, Baeg JO, Kim J. Photochemical Production of NADH Using Cobaloxime Catalysts and Visible-Light Energy. Inorg Chem 2012; 51:8057-63. [DOI: 10.1021/ic300185n] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Jin Ah Kim
- Department of Chemistry
and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Soojin Kim
- Department of Chemistry
and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Jungha Lee
- Department of Chemistry
and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Jin-Oog Baeg
- Advanced Chemical
Technology Division, Korea Research Institute of Chemical Technology (KRICT), Daejeon 305-343, Korea
| | - Jinheung Kim
- Department of Chemistry
and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| |
Collapse
|
19
|
Yeo BS, Klaus SL, Ross PN, Mathies RA, Bell AT. Identification of hydroperoxy species as reaction intermediates in the electrochemical evolution of oxygen on gold. Chemphyschem 2010; 11:1854-7. [PMID: 20473978 DOI: 10.1002/cphc.201000294] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Boon Siang Yeo
- Department of Chemical Engineering, University of California, Berkeley, Berkeley, CA 94720, USA
| | | | | | | | | |
Collapse
|
20
|
Pitié M, Pratviel G. Activation of DNA Carbon−Hydrogen Bonds by Metal Complexes. Chem Rev 2010; 110:1018-59. [DOI: 10.1021/cr900247m] [Citation(s) in RCA: 138] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Marguerite Pitié
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, and Université de Toulouse, Toulouse, France
| | - Geneviève Pratviel
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, F-31077 Toulouse, France, and Université de Toulouse, Toulouse, France
| |
Collapse
|
21
|
Denisov IG, Mak PJ, Makris TM, Sligar SG, Kincaid JR. Resonance Raman characterization of the peroxo and hydroperoxo intermediates in cytochrome P450. J Phys Chem A 2009; 112:13172-9. [PMID: 18630867 DOI: 10.1021/jp8017875] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Resonance Raman (RR) studies of intermediates generated by cryoreduction of the oxyferrous complex of the D251N mutant of cytochrome P450(cam) (CYP101) are reported. Owing to the fact that proton delivery to the active site is hindered in this mutant, the unprotonated peroxo-ferric intermediate is observed as the primary species after radiolytic reduction of the oxy-complex in frozen solutions at 77 K. In as much as previous EPR and ENDOR studies have shown that annealing of this species to approximately 180 K results in protonation of the distal oxygen atom to form the hydroperoxo intermediate, this system has been exploited to permit direct RR interrogation of the changes in the Fe-O and O-O bonds caused by the reduction and subsequent protonation. Our results show that the nu(O-O) mode decreases from a superoxo-like frequency near approximately 1130 cm(-1) to 792 cm(-1) upon reduction. The latter frequency, as well as its lack of sensitivity to H/D exchange, is consistent with heme-bound peroxide formulation. This species also exhibits a nu(Fe-O) mode, the 553 cm(-1) frequency of which is higher than that observed for the nonreduced oxy P450 precursor (537 cm(-1)), implying a strengthened Fe-O linkage upon reduction. Upon subsequent protonation, the resulting Fe-O-OH fragment exhibits a lowered nu(O-O) mode at 774 cm(-1), whereas the nu(Fe-O) increases to 564 cm(-1). Both modes exhibit a downshift upon H/D exchange, as expected for a hydroperoxo-ferric formulation. These experimental RR data are compared with those previously acquired for the wild-type protein, and the shifts observed upon reduction and subsequent protonation are discussed with reference to theoretical predictions.
Collapse
Affiliation(s)
- Ilia G Denisov
- Department of Biochemistry, University of Illinois, Urbana, Illinois 61801, USA
| | | | | | | | | |
Collapse
|
22
|
Mak PJ, Kincaid JR. Resonance Raman spectroscopic studies of hydroperoxo derivatives of cobalt-substituted myoglobin. J Inorg Biochem 2008; 102:1952-7. [PMID: 18723225 DOI: 10.1016/j.jinorgbio.2008.07.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2008] [Revised: 07/11/2008] [Accepted: 07/14/2008] [Indexed: 11/15/2022]
Abstract
Recent progress in generating and stabilizing reactive heme protein enzymatic intermediates by cryoradiolytic reduction has prompted application of a range of spectroscopic approaches to effectively interrogate these species. The impressive potential of resonance Raman spectroscopy for characterizing such samples has been recently demonstrated in a number of studies of peroxo- and hydroperoxo-intermediates. While it is anticipated that this approach can be productively applied to the wide range of heme proteins whose reaction cycles naturally involve these peroxo- and hydroperoxo-intermediates, one limitation that sometimes arises is the lack of enhancement of the key intraligand nu(O-O) stretching mode in the native systems. The present work was undertaken to explore the utility of cobalt substitution to enhance both the nu(Co-O) and nu(O-O) modes of the CoOOH fragments of hydroperoxo forms of heme proteins bearing a trans-axial histidine linkage. Thus, having recently completed RR studies of hydroperoxo myoglobin, attention is now turned to its cobalt-substituted analogue. Spectra are acquired for samples prepared with (16)O(2) and (18)O(2) to reveal the nu(M-O) and nu(O-O) modes, the latter indeed being observed only for the cobalt-substituted proteins. In addition, spectra of samples prepared in deuterated solvents were also acquired, providing definitive evidence for the presence of the hydroperoxo-species.
Collapse
Affiliation(s)
- Piotr J Mak
- Department of Chemistry, Marquette University, Milwaukee, WI 53233, USA
| | | |
Collapse
|
23
|
Crystal structure of DNA-bound Co(III) bleomycin B2: Insights on intercalation and minor groove binding. Proc Natl Acad Sci U S A 2008; 105:5052-6. [PMID: 18362349 DOI: 10.1073/pnas.0708143105] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Bleomycins constitute a widely studied class of complex DNA cleaving natural products that are used to treat various cancers. Since their first isolation, the bleomycins have provided a paradigm for the development and discovery of additional DNA-cleaving chemotherapeutic agents. The bleomycins consist of a disaccharide-modified metal-binding domain connected to a bithiazole/C-terminal tail via a methylvalerate-Thr linker and induce DNA damage after oxygen activation through site-selective cleavage of duplex DNA at 5'-GT/C sites. Here, we present crystal structures of two different 5'-GT containing oligonucleotides in both the presence and absence of bound Co(III).bleomycin B(2). Several findings from our studies impact the current view of bleomycin binding to DNA. First, we report that the bithiazole intercalates in two distinct modes and can do so independently of well ordered minor groove binding of the metal binding/disaccharide domains. Second, the Co(III)-coordinating equatorial ligands in our structure include the imidazole, histidine amide, pyrimidine N1, and the secondary amine of the beta aminoalanine, whereas the primary amine acts as an axial ligand. Third, minor groove binding of Co(III).bleomycin involves direct hydrogen bonding interactions of the metal binding domain and disaccharide with the DNA. Finally, modeling of a hydroperoxide ligand coordinated to Co(III) suggests that it is ideally positioned for initiation of C4'-H abstraction.
Collapse
|
24
|
|
25
|
Mak PJ, Denisov IG, Victoria D, Makris TM, Deng T, Sligar SG, Kincaid JR. Resonance Raman detection of the hydroperoxo intermediate in the cytochrome P450 enzymatic cycle. J Am Chem Soc 2007; 129:6382-3. [PMID: 17461587 PMCID: PMC2574425 DOI: 10.1021/ja071426h] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Piotr J Mak
- Department of Chemistry, Marquette University, Milwaukee, WI 53233, USA
| | | | | | | | | | | | | |
Collapse
|
26
|
Kumar D, Hirao H, Shaik S, Kozlowski PM. Proton-shuffle mechanism of O-O activation for formation of a high-valent oxo-iron species of bleomycin. J Am Chem Soc 2007; 128:16148-58. [PMID: 17165768 DOI: 10.1021/ja064611o] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bleomycins (BLMs) can utilize H2O2 to cleave DNA in the presence of ferric ions. DFT calculations were used to study the mechanism of O-O bond cleavage in the low-spin FeIII-hydroperoxo complex of BLM. The following alternative hypotheses were investigated using realistic structural models: (a) heterolytic cleavage of the O-O bond, generating a Compound I (Cpd I) like intermediate, formally BLM-FeV=O; (b) homolytic O-O cleavage, leading to a BLM-FeIV=O species and an OH* radical; and (c) a direct O-O cleavage/H-abstraction mechanism by ABLM. The calculations showed that (a) is a facile and viable mechanism; it involves acid-base proton reshuffle mediated by the side-chain linkers of BLM, causing thereby heterolytic cleavage of the O-O bond and generation of Cpd I. Formation of Cpd I is found to involve a barrier of 13.3 kcal/mol, which is lower than the barriers in the alternative mechanisms (b and c) that possess respective barriers of 31 and 17 kcal/mol. The so-formed Cpd I species with a radical on the side-chain linker, methylvalerate (V), adjacent to the BLM-FeIV=O complex, resembles the formation of the active species of cytochrome c peroxidase in the Poulos-Kraut proton-shuffle mechanism in heme peroxidases (Poulos, T. L.; Kraut, J. J. Biol. Chem. 1980, 255, 8199-8205). Experimental data are discussed and shown to be in accord with this proposal. It suggests that the high-valence Cpd I species of BLM participates in the DNA cleavage. This is an alternative mechanistic hypothesis to the exclusive reactivity scenario based on ABLM (FeIII-OOH).
Collapse
Affiliation(s)
- Devesh Kumar
- Department of Organic Chemistry and the Lise Meitner-Minerva Center for Computational Quantum Chemistry, The Hebrew University, Jerusalem 91904, Israel
| | | | | | | |
Collapse
|
27
|
Kozlowski PM, Nazarenko VV, Jarzecki AA. DFT analysis of interligand vibrations in a hydroperoxo complex of cobalt bleomycin. Inorg Chem 2007; 45:1424-6. [PMID: 16471949 DOI: 10.1021/ic051629b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Density functional theory (DFT) has been applied to the analysis of interligand vibrations in two chiral isomers of hydroperoxo complex of cobalt bleomycin (BLM-Co(III)-OOH, BLM = bleomycin). The DFT-based normal coordinate analysis reveals that 16O/18O isotope-sensitive modes associated with the Co-OOH moiety uniquely reflect the chiral organization of ligands around the cobalt atom. This study provides an independent probe of cobalt chirality coordinated to BLM and shows that interligand modes associated with the Co-OOH moiety could be used as a structural marker of the chiral isomers.
Collapse
Affiliation(s)
- Pawel M Kozlowski
- Department of Chemistry, University of Louisville, Kentucky 40292, USA.
| | | | | |
Collapse
|
28
|
Lewis MA, Long EC. Fluorescent intercalator displacement analyses of DNA binding by the peptide-derived natural products netropsin, actinomycin, and bleomycin. Bioorg Med Chem 2006; 14:3481-90. [PMID: 16439138 DOI: 10.1016/j.bmc.2006.01.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2005] [Revised: 01/04/2006] [Accepted: 01/04/2006] [Indexed: 11/17/2022]
Abstract
The response of the high-throughput fluorescent intercalator displacement (HT-FID) assay reported recently by Boger et al. to peptide-based DNA binding intercalators and metal complexes was examined through the study of actinomycin and Co(III).bleomycin-B2. Along with a validation of netropsin that illustrated the good laboratory-to-laboratory reproducibility of the assay, our examination of actinomycin revealed results for a four base pair cassette library of DNA hairpins that paralleled the known DNA site-selectivity of this agent and also indicated the involvement of the flanking sequences of the hairpin oligonucleotide. In addition, for Co(III).bleomycin-B2 the established cleavage site-selectivity for 5'-GT and 5'-GC sites was correlated to drug-DNA association in this binding-only assay; our results also suggest a tetranucleotide site-selectivity for metallobleomycin involving cross-strand, 'back-to-back' 5'-GT and 5'-GC sites such as 5'-ACGT and 5'-ACGC.
Collapse
Affiliation(s)
- Mark A Lewis
- Department of Chemistry and Chemical Biology, Purdue School of Science, Indiana University-Purdue University Indianapolis (IUPUI), 402 North Blackford Street, Indianapolis, IN 46202, USA
| | | |
Collapse
|
29
|
Kalliri E, Grzyska PK, Hausinger RP. Kinetic and spectroscopic investigation of CoII, NiII, and N-oxalylglycine inhibition of the FeII/alpha-ketoglutarate dioxygenase, TauD. Biochem Biophys Res Commun 2005; 338:191-7. [PMID: 16165092 DOI: 10.1016/j.bbrc.2005.08.223] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2005] [Accepted: 08/30/2005] [Indexed: 11/23/2022]
Abstract
Co(II), Ni(II), and N-oxalylglycine (NOG) are well-known inhibitors of Fe(II)/alpha-ketoglutarate (alphaKG)-dependent hydroxylases, but few studies describe their kinetics and no spectroscopic investigations have been reported. Using taurine/alphaKG dioxygenase (TauD) as a paradigm for this enzyme family, time-dependent inhibition assays showed that Co(II) and Ni(II) follow slow-binding inhibition kinetics. Whereas Ni(II)-substituted TauD was non-chromophoric, spectroscopic studies of the Co(II)-substituted enzyme revealed a six-coordinate site (protein alone or with alphaKG) that became five-coordinate upon taurine addition. The Co(II) spectrum was not perturbed by a series of anions or oxidants, suggesting the Co(II) is inaccessible and could be used to stabilize the protein. NOG competed weakly (Ki approximately 290 microM) with alphaKG for binding to TauD, with the increased electron density of NOG yielding electronic transitions for NOG-Fe(II)-TauD and taurine-NOG-Fe(II)-TauD at 380 nm (epsilon380 90-105 M(-1) cm(-1)). The spectra of the NOG-bound TauD species did not change significantly upon oxygen exposure, arguing against the formation of an oxygen-bound state mimicking an early intermediate in catalysis.
Collapse
Affiliation(s)
- Efthalia Kalliri
- Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA
| | | | | |
Collapse
|
30
|
Kovalenko SV, Alabugin IV. Lysine-enediyne conjugates as photochemically triggered DNA double-strand cleavage agents. Chem Commun (Camb) 2005:1444-6. [PMID: 15756330 DOI: 10.1039/b417012a] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Statistical analysis of DNA-photocleavage by two types of lysine-enediyne conjugates confirms that more double-strand breaks are produced than can be accounted for by coincident single-strand breaks.
Collapse
Affiliation(s)
- Serguei V Kovalenko
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306-4390, USA
| | | |
Collapse
|