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Mass OA, Watt DR, Patten LK, Pensack RD, Lee J, Turner DB, Yurke B, Knowlton WB. Exciton delocalization in a fully synthetic DNA-templated bacteriochlorin dimer. Phys Chem Chem Phys 2023; 25:28437-28451. [PMID: 37843877 PMCID: PMC10599410 DOI: 10.1039/d3cp01634j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 08/23/2023] [Indexed: 10/17/2023]
Abstract
A bacteriochlorophyll a (Bchla) dimer is a basic functional unit in the LH1 and LH2 photosynthetic pigment-protein antenna complexes of purple bacteria, where an ordered, close arrangement of Bchla pigments-secured by noncovalent bonding to a protein template-enables exciton delocalization at room temperature. Stable and tunable synthetic analogs of this key photosynthetic subunit could lead to facile engineering of exciton-based systems such as in artificial photosynthesis, organic optoelectronics, and molecular quantum computing. Here, using a combination of synthesis and theory, we demonstrate that exciton delocalization can be achieved in a dimer of a synthetic bacteriochlorin (BC) featuring stability, high structural modularity, and spectral properties advantageous for exciton-based devices. The BC dimer was covalently templated by DNA, a stable and highly programmable scaffold. To achieve exciton delocalization in the absence of pigment-protein interactions critical for the Bchla dimer, we relied on the strong transition dipole moment in BC enabled by two auxochromes along the Qy transition, and omitting the central metal and isocyclic ring. The spectral properties of the synthetic "free" BC closely resembled those of Bchla in an organic solvent. Applying spectroscopic modeling, the exciton delocalization in the DNA-templated BC dimer was evaluated by extracting the excitonic hopping parameter, J to be 214 cm-1 (26.6 meV). For comparison, the same method applied to the natural protein-templated Bchla dimer yielded J of 286 cm-1 (35.5 meV). The smaller value of J in the BC dimer likely arose from the partial bacteriochlorin intercalation and the difference in medium effect between DNA and protein.
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Affiliation(s)
- Olga A Mass
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho 83725, USA.
| | - Devan R Watt
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho 83725, USA.
| | - Lance K Patten
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho 83725, USA.
| | - Ryan D Pensack
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho 83725, USA.
| | - Jeunghoon Lee
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho 83725, USA.
- Department of Chemistry and Biochemistry, Boise State University, Boise, Idaho 83725, USA
| | - Daniel B Turner
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho 83725, USA.
| | - Bernard Yurke
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho 83725, USA.
- Department of Electrical & Computer Engineering, Boise State University, Boise, Idaho 83725, USA
| | - William B Knowlton
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho 83725, USA.
- Department of Electrical & Computer Engineering, Boise State University, Boise, Idaho 83725, USA
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Zamisa SJ, Adeleke AA, Devnarain N, Rhman MA, Owira PMO, Omondi B. The link between relative stability constant of DNA- and BSA-chromenopyrimidine complexes and cytotoxicity towards human breast cancer cells (MCF-7). RSC Adv 2023; 13:21820-21837. [PMID: 37475760 PMCID: PMC10354499 DOI: 10.1039/d3ra01741a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 07/11/2023] [Indexed: 07/22/2023] Open
Abstract
In this study, we synthesized and characterized ten chromenopyrimidine derivatives using analytical and spectroscopic methods. Studies on DNA and albumin binding affinity, as well as cytotoxicity tests on human breast cancer (MCF-7) cells, of the chromenopyrimidines, were conducted. The natural logarithm of the relative stability constant of DNA- and BSA-chromenopyrimidine complexes [ln(KDNA/KBSA)] was used as a criterion for selecting compounds for cytotoxicity studies. We found that ln(KDNA/KBSA) was inversely related to IC50 values of the compounds in MCF-7 cells. The antiproliferative effects of the compounds were found to induce apoptosis in MCF-7 cells, which is a desired mechanism of cell death. Correlations between the DNA and albumin binding affinities of chromenopyrimidines were established. We propose that this relationship approach can, for a given set of compounds, assist in predicting the cytotoxicity of potential drug candidates towards MCF-7 cells based on their experimentally determined CT-DNA and BSA binding affinities.
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Affiliation(s)
- Sizwe J Zamisa
- School of Chemistry and Physics, University of KwaZulu-Natal Private Bag X54001 Durban 4000 South Africa
| | - Adesola A Adeleke
- School of Chemistry and Physics, University of KwaZulu-Natal Private Bag X54001 Durban 4000 South Africa
| | - Nikita Devnarain
- Molecular and Clinical Pharmacology Research Laboratory, Department of Pharmacology, Discipline of Pharmaceutical Science, University of KwaZulu-Natal Private Bag X54001 Durban 4000 South Africa
| | - Mahasin Abdel Rhman
- Molecular and Clinical Pharmacology Research Laboratory, Department of Pharmacology, Discipline of Pharmaceutical Science, University of KwaZulu-Natal Private Bag X54001 Durban 4000 South Africa
| | - Peter M O Owira
- Molecular and Clinical Pharmacology Research Laboratory, Department of Pharmacology, Discipline of Pharmaceutical Science, University of KwaZulu-Natal Private Bag X54001 Durban 4000 South Africa
| | - Bernard Omondi
- School of Chemistry and Physics, University of KwaZulu-Natal Private Bag X54001 Durban 4000 South Africa
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Venugopal S, Sharma V, Anuradha M, Singh I, Singh G. DNA Intercalators as Anticancer Agents. Chem Biol Drug Des 2022; 100:580-598. [PMID: 35822451 DOI: 10.1111/cbdd.14116] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 06/17/2022] [Accepted: 06/26/2022] [Indexed: 11/28/2022]
Abstract
Cancer is one of the most prevailing disease conditions which occurs due to uncontrolled cell division either due to natural mutation to the genes or due to changes induced by physical, chemical, or biological carcinogens. According to WHO, it is the second leading cause of death worldwide and has reported 10 million deaths in 2020. Hence there arises the need for better chemotherapies and DNA intercalators are one such emerging therapy for cancer. DNA intercalating agents reversibly intercalate with the double-helical structure of DNA by interacting with adjacent base pairs and disrupting the structure of DNA and thereby causing cell death. Here we discuss the different classes of organo-intercalators used in cancer therapy describing their anticancer and intercalation ability by different methods along with their structure-activity relationship and mechanism of action.
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Affiliation(s)
- Sneha Venugopal
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Lovely Professional University, Punjab-144411, India
| | - Vikas Sharma
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Lovely Professional University, Punjab-144411, India
| | - Mehra Anuradha
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Lovely Professional University, Punjab-144411, India
| | - Iqubal Singh
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Lovely Professional University, Punjab-144411, India
| | - Gurdeep Singh
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Lovely Professional University, Punjab-144411, India
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Ramotowska S, Ciesielska A, Makowski M. What Can Electrochemical Methods Offer in Determining DNA-Drug Interactions? Molecules 2021; 26:3478. [PMID: 34200473 PMCID: PMC8201389 DOI: 10.3390/molecules26113478] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 06/02/2021] [Accepted: 06/04/2021] [Indexed: 11/16/2022] Open
Abstract
The interactions of compounds with DNA have been studied since the recognition of the role of nucleic acid in organisms. The design of molecules which specifically interact with DNA sequences allows for the control of the gene expression. Determining the type and strength of such interaction is an indispensable element of pharmaceutical studies. Cognition of the therapeutic action mechanisms is particularly important for designing new drugs. Owing to their sensitivity, simplicity, and low costs, electrochemical methods are increasingly used for this type of research. Compared to other techniques, they require a small number of samples and are characterized by a high reliability. These methods can provide information about the type of interaction and the binding strength, as well as the damage caused by biologically active molecules targeting the cellular DNA. This review paper summarizes the various electrochemical approaches used for the study of the interactions between pharmaceuticals and DNA. The main focus is on the papers from the last decade, with particular attention on the voltammetric techniques. The most preferred experimental approaches, the electrode materials and the new methods of modification are presented. The data on the detection ranges, the binding modes and the binding constant values of pharmaceuticals are summarized. Both the importance of the presented research and the importance of future prospects are discussed.
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Affiliation(s)
| | | | - Mariusz Makowski
- Department of Bioinorganic Chemistry, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland; (S.R.); (A.C.)
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Development of a new electrochemical DNA biosensor based on Eu 3+-doped NiO for determination of amsacrine as an anti-cancer drug: Electrochemical, spectroscopic and docking studies. Anal Chim Acta 2020; 1133:48-57. [PMID: 32993873 DOI: 10.1016/j.aca.2020.07.071] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 07/20/2020] [Accepted: 07/30/2020] [Indexed: 12/14/2022]
Abstract
The present research reported a new electrochemical biosensor based on ds-DNA/Eu3+ doped NiO/CPE to detect amsacrine. Therefore, UV-Vis spectrophotometry, docking, and differential pulse voltammetry (DPV) have been used to study the interactions between amsacrine and dsDNA. Then, experimental parameters affected DNA immobilization and interactions between amsacrine and ds-DNA have been optimized. Afterwards, guanine oxidation peak current of ds-DNA has been chosen as a signal to analyze amsacrine in a concentration ranging between 0.1 and 100.0 μM and finally, limit of detection (LOD) of 0.05 μM has been calculated at optimal condition. Ultimately, it was found that the suggested biosensor is able to determine amsacrine in human serum and urine samples successfully.
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