1
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Singh K, Reddy G. Excited States of apo-Guanidine-III Riboswitch Contribute to Guanidinium Binding through Both Conformational and Induced-Fit Mechanisms. J Chem Theory Comput 2024; 20:421-435. [PMID: 38134376 DOI: 10.1021/acs.jctc.3c00999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2023]
Abstract
Riboswitches are mRNA segments that regulate gene expression through conformational changes driven by their cognate ligand binding. The ykkC motif forms a riboswitch class that selectively senses a guanidinium ion (Gdm+) and regulates the downstream expression of proteins which aid in the efflux of excess Gdm+ from the cells. The aptamer domain (AD) of the guanidine-III riboswitch forms an H-type pseudoknot with a triple helical domain that binds a Gdm+. We studied the binding of Gdm+ to the AD of the guanidine (ykkC)-III riboswitch using computer simulations to probe the specificity of the riboswitch to Gdm+ binding. We show that Gdm+ binding is a fast process occurring on the nanosecond time scale, with minimal conformational changes to the AD. Using machine learning and Markov-state models, we identified the excited conformational states of the AD, which have a high Gdm+ binding propensity, making the Gdm+ binding landscape complex exhibiting both conformational selection and induced-fit mechanisms. The proposed apo-AD excited states and their role in the ligand-sensing mechanism are amenable to experimental verification. Further, targeting these excited-state conformations in discovering new antibiotics can be explored.
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Affiliation(s)
- Kushal Singh
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012 Karnataka, India
| | - Govardhan Reddy
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012 Karnataka, India
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2
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Prakash M, Rudharachari Maiyelvaganan K, Lakshman NG, Mogren Al-Mogren M, Hochlaf M. Formation of Eigen or Zundel Features at Protonated Water Cluster-Aromatic Interfaces. Chemphyschem 2023; 24:e202300267. [PMID: 37283005 DOI: 10.1002/cphc.202300267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Revised: 05/27/2023] [Accepted: 06/02/2023] [Indexed: 06/08/2023]
Abstract
Interfacial interactions of protonated water clusters adsorbed at aromatic surfaces play an important role in biology, and in atmospheric, chemical and materials sciences. Here, we investigate the interaction of protonated water clusters ((H+ H2 O)n (where n=1-3)) with benzene (Bz), coronene (Cor) and dodecabenzocoronene (Dbc)). To study the structure, stability and spectral features of these complexes, computations are done using DFT-PBE0(+D3) and SAPT0 methods. These interactions are probed by AIM electron density topography and non-covalent interactions index (NCI) analyses. We suggest that the excess proton plays a crucial role in the stability of these model interfaces through strong inductive effects and the formation of Eigen or Zundel features. Also, computations reveal that the extension of the π-aromatic system and the increase of the number of water molecules in the H-bounded water network led to a strengthening of the interactions between the corresponding aromatic compound and protonated water molecules, except when a Zundel ion is formed. The present findings may serve to understand in-depth the role of proton localized at aqueous medium interacting with large aromatic surfaces such as graphene interacting with acidic liquid water. Besides, we give the IR and UV-Vis spectra of these complexes, which may help for their identification in laboratory.
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Affiliation(s)
- Muthuramalingam Prakash
- Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203, Chengalpattu District, Tamil Nadu, India
| | - K Rudharachari Maiyelvaganan
- Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203, Chengalpattu District, Tamil Nadu, India
| | - N Giri Lakshman
- Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, 603203, Chengalpattu District, Tamil Nadu, India
| | - Muneerah Mogren Al-Mogren
- Department of Chemistry, College of Sciences, King Saud University, PO Box 2455, Riyadh, 11451, Saudi Arabia
| | - Majdi Hochlaf
- Université Gustave Eiffel, COSYS/IMSE, 5 Bd Descartes, 77454, Champs Sur Marne, France
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3
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Al-Yassiri MAH. Tubular Magnetic Shielding Scan (TMSS): A New Technique for Molecular Space Exploration. (i) The Case of Aromaticity of Benzene and [ n]Paracyclophanes. J Phys Chem A 2023; 127:6614-6627. [PMID: 37501257 DOI: 10.1021/acs.jpca.3c03041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
Both traditional and novel techniques were employed in this work for magnetic shielding evaluation to shed new light on the magnetic and aromaticity properties of benzene and 12 [n]paracyclophanes with n = 3-14. Density functional theory (DFT) with the B3LYP functional and all-electron Jorge-ATZP and x2c-TZVPPall-s basis sets was utilized for geometry optimization and magnetic shielding calculations, respectively. Additionally, the 6-311+G(d,p) basis set was incorporated for the purpose of comparing the magnetic shielding results. In addition to traditional evaluations such as NICS/NICSzz-Scan, and 2D-3D σiso(r)/σzz(r) maps, two new techniques were implemented: bendable grids (BGs) and cylindrical grids (CGs) of ghost atoms (Bqs). BGs allow for the recording of magnetic shielding from the bent ring levels of [n]pCPs, while CGs provide tubular magnetic shielding scan (TMSS) maps detailing the magnetic shielding from a cylindrical region above and below the ring frame. Our findings suggest that smaller [n]pCPs with n < 6 exhibit deviations in the magnetic shielding above and below the ring, indicating a broken electron delocalization under the ring. In contrast, larger [n]pCPs tend to behave similarly to benzene in terms of magnetic shielding. Moreover, we found that shorter polymethylene chains of [n]pCPs exhibit significantly higher magnetic shielding interactions with the ring. Both of the above techniques offer new and promising tools for characterizing nonplanar aromatic compounds, thereby contributing to a deeper understanding of their magnetic and electronic properties.
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Affiliation(s)
- Muntadar A H Al-Yassiri
- Department of Chemistry, College of Science, University of Baghdad, Al-Jadirya, Baghdad 10071, Iraq
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4
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Simultaneous Interaction of Graphene Nanoflakes with Cations and Anions: A Cooperativity Study. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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5
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Embarc-Buh A, Francisco-Velilla R, Camero S, Pérez-Cañadillas JM, Martínez-Salas E. The RBS1 domain of Gemin5 is intrinsically unstructured and interacts with RNA through conserved Arg and aromatic residues. RNA Biol 2021; 18:496-506. [PMID: 34424823 PMCID: PMC8677033 DOI: 10.1080/15476286.2021.1962666] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
Gemin5 is a multifaceted RNA-binding protein that comprises distinct structural domains, including a WD40 and TPR-like for which the X-ray structure is known. In addition, the protein contains a non-canonical RNA-binding domain (RBS1) towards the C-terminus. To understand the RNA binding features of the RBS1 domain, we have characterized its structural characteristics by solution NMR linked to RNA-binding activity. Here we show that a short version of the RBS1 domain that retains the ability to interact with RNA is predominantly unfolded even in the presence of RNA. Furthermore, an exhaustive mutational analysis indicates the presence of an evolutionarily conserved motif enriched in R, S, W, and H residues, necessary to promote RNA-binding via π-π interactions. The combined results of NMR and RNA-binding on wild-type and mutant proteins highlight the importance of aromatic and arginine residues for RNA recognition by RBS1, revealing that the net charge and the π-amino acid density of this region of Gemin5 are key factors for RNA recognition.
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Affiliation(s)
| | | | - Sergio Camero
- Instituto de Química Física Rocasolano, CSIC, Madrid
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6
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Law ASY, Lee LCC, Lo KKW, Yam VWW. Aggregation and Supramolecular Self-Assembly of Low-Energy Red Luminescent Alkynylplatinum(II) Complexes for RNA Detection, Nucleolus Imaging, and RNA Synthesis Inhibitor Screening. J Am Chem Soc 2021; 143:5396-5405. [PMID: 33813827 DOI: 10.1021/jacs.0c13327] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
As an important nuclear substructure, the nucleolus has received increasing attention because of its significant functions in the transcription and processing of ribosomal RNA in eukaryotic cells. In this work, we introduce a proof-of-concept luminescence assay to detect RNA and to accomplish nucleolus imaging with the use of the supramolecular self-assembly of platinum(II) complexes. Noncovalent interactions between platinum(II) complexes and RNA can be induced by the introduction of a guanidinium group into the complexes, and accordingly, a high RNA affinity can be achieved. Interestingly, the aggregation affinities of platinum(II) complexes enable them to display remarkable luminescence turn-on upon RNA binding, which is a result of the strengthening of noncovalent Pt(II)···Pt(II) and π-π stacking interactions. The complexes exhibit not only intriguing spectroscopic changes and luminescence enhancement after RNA binding but also specific nucleolus imaging in cells. As compared to fluorescent dyes, the low-energy red luminescence and large Stokes shifts of platinum(II) complexes afford a high signal-to-background autofluorescence ratio in nucleolus imaging. Additional properties, including long phosphorescence lifetimes and low cytotoxicity, have endowed the platinum(II) complexes with the potential for biological applications. Also, platinum(II) complexes have been adopted to monitor the dynamics of the nucleolus induced by the addition of RNA synthesis inhibitors. This capability allows the screening of inhibitors and can be advantageous for the development of antineoplastic agents. This work provides a novel strategy for exploring the application of platinum(II) complex-based cell imaging agents based on the mechanism of supramolecular self-assembly. It is envisaged that platinum(II) complexes can be utilized as valuable probes because of the aforementioned appealing advantages.
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Affiliation(s)
- Angela Sin-Yee Law
- Institute of Molecular Functional Materials, State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
| | - Lawrence Cho-Cheung Lee
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
| | - Kenneth Kam-Wing Lo
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional Materials, State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
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7
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Exceptional bifurcated chalcogen bonding interaction between Ph2N2O2 and only one σ–hole on XCY (X=S, Se, Te and Y=O, S, Se, Te): a DFT study. Theor Chem Acc 2020. [DOI: 10.1007/s00214-020-02669-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Complexes of damirone A/C, batzelline A/D, makaluvamine O and makaluvone with guanidinium and magnesium cations: a theoretical study. Struct Chem 2019. [DOI: 10.1007/s11224-019-01325-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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9
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Corrales Sánchez V, Nieto-Jiménez C, Castro-Osma JA, de Andrés F, Pacheco-Liñán PJ, Bravo I, Rodríguez Fariñas N, Niza E, Domínguez-Jurado E, Lara-Sánchez A, Ríos Á, Gómez Juárez M, Montero JC, Pandiella A, Shafir A, Alonso-Moreno C, Ocaña A. Screening and Preliminary Biochemical and Biological Studies of [RuCl( p-cymene)( N, N-bis(diphenylphosphino)-isopropylamine)][BF 4] in Breast Cancer Models. ACS OMEGA 2019; 4:13005-13014. [PMID: 31460427 PMCID: PMC6704442 DOI: 10.1021/acsomega.9b00296] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 06/26/2019] [Indexed: 06/10/2023]
Abstract
Breast cancer is the second leading cause of cancer death worldwide. Despite progress in drug discovery, identification of the correct population is the limiting factor to develop new compounds in the clinical setting. Therefore, the aim of this study is to evaluate the effects of a new metallodrug, [RuCl(p-cymene)(N,N-bis(diphenylphosphino)-isopropylamine)][BF4] (pnpRu-14), as a lead pnp-Ru compound by screening and preliminary biochemical and biological studies in different breast cancer subtypes. The results show that complex pnpRu-14 is much more effective in promoting in vitro cytotoxic effects on HER2+ and RH+/HER2- breast cancer than the reference metallodrugs cisplatin, carboplatin, or RAPTA-C. It is important to highlight that pnpRu-14 shows an impressive cytotoxicity against BT474 cells. Caspase-dependent apoptosis is the mechanism of action for these compounds. In addition, treatment of SKBR3, BT474, T47D, and MCF7 cancer cells with pnpRu-14 caused an accumulation of cells in the G0/G1 phase cells. The human serum albumin, DNA, and H1 histones binding properties of the lead compound are reported. Pharmacokinetic and biodistribution studies show a quick absorption of pnpRu-14 in serum with no significant accumulation in any of the tested organs. This work provides evidence to support the preclinical and clinical development of pnpRu-14 in breast cancer.
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Affiliation(s)
- Veronica Corrales Sánchez
- Oncología
traslacional and CIBERONC, Unidad de Investigación del Complejo
Hospitalario Universitario de Albacete, 02006 Albacete, Spain
| | - Cristina Nieto-Jiménez
- Oncología
traslacional and CIBERONC, Unidad de Investigación del Complejo
Hospitalario Universitario de Albacete, 02006 Albacete, Spain
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
| | - José Antonio Castro-Osma
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
| | - Fernando de Andrés
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
| | - Pedro J. Pacheco-Liñán
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
| | - Iván Bravo
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
| | - Nuria Rodríguez Fariñas
- Dpto.
Química Analítica, Facultad de Ciencias Ambientales
y Bioquímicas de Toledo, UCLM, 45071 Toledo, Spain
| | - Enrique Niza
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
| | - Elena Domínguez-Jurado
- Oncología
traslacional and CIBERONC, Unidad de Investigación del Complejo
Hospitalario Universitario de Albacete, 02006 Albacete, Spain
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
| | - Agustín Lara-Sánchez
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
| | - Ángel Ríos
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
- Dpto.
Química Analítica y Tecnología de Alimentos, Facultad de Ciencias
y Tecnologías Químicas de Ciudad Real, UCLM, 13005 Ciudad Real, Spain
| | - Mónica Gómez Juárez
- Oncología
traslacional and CIBERONC, Unidad de Investigación del Complejo
Hospitalario Universitario de Albacete, 02006 Albacete, Spain
| | - Juan Carlos Montero
- Centro
de Investigación del Cáncer-CSIC, IBSAL-Salamanca and
CIBERONC, 37007 Salmanca, Spain
| | - Atanasio Pandiella
- Centro
de Investigación del Cáncer-CSIC, IBSAL-Salamanca and
CIBERONC, 37007 Salmanca, Spain
| | - Alexandr Shafir
- Department
of Biological Chemistry, Institute
of Advanced Chemistry of Catalonia, IQAC-CSIC, c/Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Carlos Alonso-Moreno
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
| | - Alberto Ocaña
- Oncología
traslacional and CIBERONC, Unidad de Investigación del Complejo
Hospitalario Universitario de Albacete, 02006 Albacete, Spain
- Hospital
Clinico San Carlos, 28040 Madrid, Spain
- Oncología
traslacional, Centro Regional de Investigaciones
Biomédicas, Dpto. Inorgánica, Orgánica y Bioquímica, Facultad
de Farmacia de Albacete, Dpto. Química Analítica y Tecnología
de Alimentos, Facultad de Farmacia de Albacete, Instituto Regional de Investigación
Científica Aplicada IRICA, and Dpto. Química Física,
Facultad de Farmacia de Albacete, UCLM, 02006 Albacete, Spain
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10
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Lv M, Wang M, Lu K, Peng L, Zhao Y. DNA/Lysozyme-binding affinity study of novel peptides from TAT (47-57) and BRCA1 (782-786) in vitro by spectroscopic analysis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 209:109-117. [PMID: 30384016 DOI: 10.1016/j.saa.2018.10.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 10/21/2018] [Indexed: 06/08/2023]
Abstract
SISLL-TAT and TAT-SISLL were synthesized by modifying the N- or C-termini of cell-penetrating peptides as transacting activator of transcription TAT (47-57) by attaching BRCA1 (782-786) (SISLL). The novel peptides were synthesized through Fmoc solid-phase synthesis procedures and characterized by LCQ Fleet MS, 1H NMR and 13C NMR. SISLL-TAT and TAT-SISLL displayed forceful antibacterial activities against Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Salmonella typhimurium with low hemolysis. SISLL-TAT showed better antibacterial activity than TAT-SISLL, with the minimum inhibitory concentration (MIC) values of 10-33 μg·mL-1. The results of the DNA-binding activities showed that both SISLL-TAT and TAT-SISLL could interact with DNA via the minor groove mode, and the binding constants were 4.97 × 105 L·mol-1 and 4.42 × 105 L·mol-1 at 310 K, respectively. Circular dichroism analysis showed slight transformation of the lysozyme secondary structure caused by SISLL-TAT and TAT-SISLL. We also found that the novel peptides SISLL-TAT and TAT-SISLL targeted bacterial DNA resulting in cell death. This explains the antibacterial mechanism of SISLL-TAT and TAT-SISLL, and is a solid theoretical basis for further designing novel and highly effective antibiotics for clinical application.
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Affiliation(s)
- Mingxiu Lv
- School of Material and Chemical Engineering, Henan University of Engineering, Zhengzhou 450007, Henan, China; College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China
| | - Mengwei Wang
- School of Material and Chemical Engineering, Henan University of Engineering, Zhengzhou 450007, Henan, China; College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China
| | - Kui Lu
- School of Material and Chemical Engineering, Henan University of Engineering, Zhengzhou 450007, Henan, China; School of Chemical Engineering and Food Science, Zhengzhou Institute of Technology, Zhengzhou 450044, Henan, China.
| | - Lu Peng
- School of Material and Chemical Engineering, Henan University of Engineering, Zhengzhou 450007, Henan, China
| | - Yufen Zhao
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China.
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11
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Quantum mechanical investigation of the nature of nucleobase-urea stacking interaction, a crucial driving force in RNA unfolding in aqueous urea. J CHEM SCI 2018. [DOI: 10.1007/s12039-018-1563-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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12
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Nicholson DA, Sengupta A, Sung HL, Nesbitt DJ. Amino Acid Stabilization of Nucleic Acid Secondary Structure: Kinetic Insights from Single-Molecule Studies. J Phys Chem B 2018; 122:9869-9876. [PMID: 30289262 DOI: 10.1021/acs.jpcb.8b06872] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Amino acid and nucleic acid interactions are central in biology and may have played a role in the evolutionary development of protein-based life from an early "RNA Universe." To explore the possible role of single amino acids in promoting nucleic acid folding, single-molecule Förster resonance energy transfer experiments have been implemented with a DNA hairpin construct (7 nucleotide double strand with a 40A loop) as a simple model for secondary structure formation. Exposure to positively charged amino acids (arginine and lysine) is found to clearly stabilize the secondary structure. Kinetically, each amino acid promotes folding by generating a large increase in the folding rate with little change in the unfolding rate. From analysis as a function of temperature, arginine and lysine are found to significantly increase the overall exothermicity of folding while imposing only a small entropic penalty on the folding process. Detailed investigations into the kinetics and thermodynamics of this amino acid-induced folding stability reveal arginine and lysine to interact with nucleic acids in a manner reminiscent of monovalent cations. Specifically, these observations are interpreted in the context of an ion atmosphere surrounding the nucleic acid, in which amino acid salts stabilize folding qualitatively like small monovalent cations but also exhibit differences because of the composition of their side chains.
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Affiliation(s)
- David A Nicholson
- JILA, National Institute of Standards and Technology and University of Colorado , Boulder , Colorado 80309 , United States
| | - Abhigyan Sengupta
- Department of Bioengineering , University of California at Merced , Merced , California 95340 , United States
| | - Hsuan-Lei Sung
- JILA, National Institute of Standards and Technology and University of Colorado , Boulder , Colorado 80309 , United States
| | - David J Nesbitt
- JILA, National Institute of Standards and Technology and University of Colorado , Boulder , Colorado 80309 , United States
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13
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Battaglia RA, Ke A. Guanidine-sensing riboswitches: How do they work and what do they regulate? WILEY INTERDISCIPLINARY REVIEWS-RNA 2018; 9:e1482. [DOI: 10.1002/wrna.1482] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 03/14/2018] [Accepted: 03/19/2018] [Indexed: 12/15/2022]
Affiliation(s)
- Robert A. Battaglia
- Department of Molecular Biology and Genetics; Cornell University; Ithaca New York
| | - Ailong Ke
- Department of Molecular Biology and Genetics; Cornell University; Ithaca New York
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14
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Intra-/Intermolecular Bifurcated Chalcogen Bonding in Crystal Structure of Thiazole/Thiadiazole Derived Binuclear (Diaminocarbene)PdII Complexes. CRYSTALS 2018. [DOI: 10.3390/cryst8030112] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The coupling of cis-[PdCl2(CNXyl)2] (Xyl = 2,6-Me2C6H3) with 4-phenylthiazol-2-amine in molar ratio 2:3 at RT in CH2Cl2 leads to binuclear (diaminocarbene)PdII complex 3c. The complex was characterized by HRESI+-MS, 1H NMR spectroscopy, and its structure was elucidated by single-crystal XRD. Inspection of the XRD data for 3c and for three relevant earlier obtained thiazole/thiadiazole derived binuclear diaminocarbene complexes (3a EYOVIZ; 3b: EYOWAS; 3d: EYOVOF) suggests that the structures of all these species exhibit intra-/intermolecular bifurcated chalcogen bonding (BCB). The obtained data indicate the presence of intramolecular S•••Cl chalcogen bonds in all of the structures, whereas varying of substituent in the 4th and 5th positions of the thiazaheterocyclic fragment leads to changes of the intermolecular chalcogen bonding type, viz. S•••π in 3a,b, S•••S in 3c, and S•••O in 3d. At the same time, the change of heterocyclic system (from 1,3-thiazole to 1,3,4-thiadiazole) does not affect the pattern of non-covalent interactions. Presence of such intermolecular chalcogen bonding leads to the formation of one-dimensional (1D) polymeric chains (for 3a,b), dimeric associates (for 3c), or the fixation of an acetone molecule in the hollow between two diaminocarbene complexes (for 3d) in the solid state. The Hirshfeld surface analysis for the studied X-ray structures estimated the contributions of intermolecular chalcogen bonds in crystal packing of 3a–d: S•••π (3a: 2.4%; 3b: 2.4%), S•••S (3c: less 1%), S•••O (3d: less 1%). The additionally performed DFT calculations, followed by the topological analysis of the electron density distribution within the framework of Bader’s theory (AIM method), confirm the presence of intra-/intermolecular BCB S•••Cl/S•••S in dimer of 3c taken as a model system (solid state geometry). The AIM analysis demonstrates the presence of appropriate bond critical points for these interactions and defines their strength from 0.9 to 2.8 kcal/mol indicating their attractive nature.
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15
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Jawiczuk M. A theoretical study on the hydrogen bond and stability of cytosine and thymine dimers. COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2017.11.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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16
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Reiss CW, Strobel SA. Structural basis for ligand binding to the guanidine-II riboswitch. RNA (NEW YORK, N.Y.) 2017; 23:1338-1343. [PMID: 28600356 PMCID: PMC5558903 DOI: 10.1261/rna.061804.117] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 05/22/2017] [Indexed: 05/04/2023]
Abstract
The guanidine-II riboswitch, also known as mini-ykkC, is a conserved mRNA element with more than 800 examples in bacteria. It consists of two stem-loops capped by identical, conserved tetraloops that are separated by a linker region of variable length and sequence. Like the guanidine-I riboswitch, it controls the expression of guanidine carboxylases and SugE-like genes. The guanidine-II riboswitch specifically binds free guanidinium cations and functions as a translationally controlled on-switch. Here we report the structure of a P2 stem-loop from the Pseudomonas aeruginosa guanidine-II riboswitch aptamer bound to guanidine at 1.57 Å resolution. The hairpins dimerize via the conserved tetraloop, which also contains the binding pocket. Two guanidinium molecules bind near the dimerization interface, one in each tetraloop. The guanidinium cation is engaged in extensive hydrogen bonding to the RNA. Contacts include the Hoogsteen face of a guanine base and three nonbridging phosphate oxygens. Cation-π interactions and ionic interactions also stabilize ligand binding. The guanidine-II riboswitch utilizes the same recognition strategies as the guanidine-I riboswitch while adopting an entirely different and much smaller RNA fold.
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Affiliation(s)
- Caroline W Reiss
- Department of Molecular Biophysics and Biochemistry, Chemical Biology Institute, Yale University, West Haven, Connecticut 06516, USA
| | - Scott A Strobel
- Department of Molecular Biophysics and Biochemistry, Chemical Biology Institute, Yale University, West Haven, Connecticut 06516, USA
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17
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Cabaleiro-Lago EM, Rodríguez-Otero J. σ-σ, σ-π, and π-π Stacking Interactions between Six-Membered Cyclic Systems. Dispersion Dominates and Electrostatics Commands. ChemistrySelect 2017. [DOI: 10.1002/slct.201700671] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Enrique M. Cabaleiro-Lago
- Facultade de Ciencias (Dpto. de Química Física); Universidade de Santiago de Compostela; Avda. Alfonso X El Sabio s/n 27002 Lugo, Galicia Spain
| | - Jesús Rodríguez-Otero
- CIQUS and Facultade de Química (Dpto. de Química Física); Universidade de Santiago de Compostela; 15782 Santiago de Compostela, Galicia Spain)
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18
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Battaglia RA, Price IR, Ke A. Structural basis for guanidine sensing by the ykkC family of riboswitches. RNA (NEW YORK, N.Y.) 2017; 23:578-585. [PMID: 28096518 PMCID: PMC5340920 DOI: 10.1261/rna.060186.116] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 01/09/2017] [Indexed: 05/20/2023]
Abstract
Regulation of gene expression by cis-encoded riboswitches is a prevalent theme in bacteria. Of the hundreds of riboswitch families identified, the majority of them remain as orphans, without a clear ligand assignment. The ykkC orphan family was recently characterized as guanidine-sensing riboswitches. Herein we present a 2.3 Å crystal structure of the guanidine-bound ykkC riboswitch from Dickeya dadantii The riboswitch folds into a boot-shaped structure, with a coaxially stacked P1/P2 stem forming the boot, and a 3'-P3 stem-loop forming the heel. Sophisticated base-pairing and cross-helix tertiary contacts give rise to the ligand-binding pocket between the boot and the heel. The guanidine is recognized in its positively charged guanidinium form, in its sp2 hybridization state, through a network of coplanar hydrogen bonds and by a cation-π stacking contact on top of a conserved guanosine residue. Disruption of these contacts resulted in severe guanidinium-binding defects. These results provide the structural basis for specific guanidine sensing by ykkC riboswitches and pave the way for a deeper understanding of guanidine detoxification-a previously unappreciated aspect of bacterial physiology.
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Affiliation(s)
- Robert A Battaglia
- Department of Molecular Biology and Genetics, Ithaca, New York 14853, USA
| | - Ian R Price
- Department of Molecular Biology and Genetics, Ithaca, New York 14853, USA
| | - Ailong Ke
- Department of Molecular Biology and Genetics, Ithaca, New York 14853, USA
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19
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Posadas I, Alonso-Moreno C, Bravo I, Carrillo-Hermosilla F, Garzón A, Villaseca N, López-Solera I, Albaladejo J, Ceña V. Synthesis, characterization, DNA interactions and antiproliferative activity on glioblastoma of iminopyridine platinum(II) chelate complexes. J Inorg Biochem 2017; 168:46-54. [DOI: 10.1016/j.jinorgbio.2016.11.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 11/22/2016] [Accepted: 11/30/2016] [Indexed: 12/21/2022]
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20
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A theoretical model of the interaction between phosphates in the ATP molecule and guanidinium systems. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-2012-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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21
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Bravo I, Alonso-Moreno C, Posadas I, Albaladejo J, Carrillo-Hermosilla F, Ceña V, Garzón A, López-Solera I, Romero-Castillo L. Phenyl-guanidine derivatives as potential therapeutic agents for glioblastoma multiforme: catalytic syntheses, cytotoxic effects and DNA affinity. RSC Adv 2016. [DOI: 10.1039/c5ra17920c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Glioblastoma is a highly malignant form of brain tumor. In the work described here, several substituted phenyl-guanidine derivatives were developed for application in glioblastoma treatment.
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Affiliation(s)
- I. Bravo
- Departamento de Química-Física
- Universidad de Castilla-La Mancha
- Facultad de Farmacia
- Campus Universitario de Albacete
- 02071-Albacete
| | - C. Alonso-Moreno
- Departamento de Química Inorgánica
- Orgánica y Bioquímica
- Universidad de Castilla-La Mancha
- Facultad de Farmacia
- Campus Universitario de Albacete
| | - I. Posadas
- Unidad Asociada Neurodeath CSIC-UCLM
- Departamento de Ciencias Médicas
- Facultad de Farmacia
- Universidad de Castilla-La Mancha
- Campus Universitario de Albacete
| | - J. Albaladejo
- Departamento de Química-Física
- Universidad de Castilla-La Mancha
- Facultad de Ciencias y Tecnologías Químicas
- Campus Universitario de Ciudad Real
- 13071-Ciudad Real
| | - F. Carrillo-Hermosilla
- Departamento de Química Inorgánica
- Orgánica y Bioquímica
- Universidad de Castilla-La Mancha
- Facultad de Ciencias y Tecnologías Químicas
- Campus Universitario de Ciudad Real
| | - V. Ceña
- Unidad Asociada Neurodeath CSIC-UCLM
- Departamento de Ciencias Médicas
- Facultad de Medicina
- Universidad de Castilla-La Mancha
- Campus Universitario de Albacete
| | - A. Garzón
- Departamento de Química-Física
- Universidad de Castilla-La Mancha
- Facultad de Farmacia
- Campus Universitario de Albacete
- 02071-Albacete
| | - I. López-Solera
- Departamento de Química Inorgánica
- Orgánica y Bioquímica
- Universidad de Castilla-La Mancha
- Facultad de Ciencias y Tecnologías Químicas
- Campus Universitario de Ciudad Real
| | - L. Romero-Castillo
- Unidad Asociada Neurodeath CSIC-UCLM
- Departamento de Ciencias Médicas
- Facultad de Farmacia
- Universidad de Castilla-La Mancha
- Campus Universitario de Albacete
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22
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Trujillo C, Rodriguez-Sanz AA, Rozas I. Aromatic Amino Acids-Guanidinium Complexes through Cation-π Interactions. Molecules 2015; 20:9214-28. [PMID: 26007180 PMCID: PMC6272432 DOI: 10.3390/molecules20059214] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Revised: 05/11/2015] [Accepted: 05/12/2015] [Indexed: 01/11/2023] Open
Abstract
Continuing with our interest in the guanidinium group and the different interactions than can establish, we have carried out a theoretical study of the complexes formed by this cation and the aromatic amino acids (phenylalanine, histidine, tryptophan and tyrosine) using DFT methods and PCM-water solvation. Both hydrogen bonds and cation-π interactions have been found upon complexation. These interactions have been characterized by means of the analysis of the molecular electron density using the Atoms-in-Molecules approach as well as the orbital interactions using the Natural Bond Orbital methodology. Finally, the effect that the cation-π and hydrogen bond interactions exert on the aromaticity of the corresponding amino acids has been evaluated by calculating the theoretical NICS values, finding that the aromatic character was not heavily modified upon complexation.
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Affiliation(s)
- Cristina Trujillo
- Trinity Biomedical Sciences Institute, School of Chemistry, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland.
| | - Ana A Rodriguez-Sanz
- Departamento de Química Física, Facultade de Ciencias, Universidade de Santiago de Compostela, Campus de Lugo, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain.
| | - Isabel Rozas
- Trinity Biomedical Sciences Institute, School of Chemistry, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland.
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23
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Bhattacharyya PK. Effect of external electric field on ground and singlet excited states of phenylalanine: A theoretical study. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.01.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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25
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Shaw JW, Grayson DH, Rozas I. Synthesis of Guanidines and Some of Their Biological Applications. TOPICS IN HETEROCYCLIC CHEMISTRY 2015. [DOI: 10.1007/7081_2015_174] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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26
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Rodríguez-Sanz AA, Cabaleiro-Lago EM, Rodríguez-Otero J. On the interaction between the imidazolium cation and aromatic amino acids. A computational study. Org Biomol Chem 2015; 13:7961-72. [DOI: 10.1039/c5ob01108f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Phe, Tyr and Trp form parallel complexes with cation⋯π interactions. His complexes are the strongest, but without making contact with the aromatic cloud.
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Affiliation(s)
- Ana A. Rodríguez-Sanz
- Departamento de Química Física
- Facultade de Ciencias
- Universidade de Santiago de Compostela
- Lugo
- Spain
| | | | - Jesús Rodríguez-Otero
- Centro de investigación en Química Biolóxica e Materiais Moleculares
- CIQUS
- Universidade de Santiago de Compostela
- Santiago de Compostela
- Spain
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27
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Dutta BJ, Bhattacharyya PK. Reactivity and Aromaticity of Nucleobases are Sensitive Toward External Electric Field. J Phys Chem B 2014; 118:9573-82. [DOI: 10.1021/jp5047535] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Biswa Jyoti Dutta
- Department of Chemistry, Arya Vidyapeeth College, Guwahati, Assam 781016, India
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28
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Marin-Luna M, Sanchez-Sanz G, O'Sullivan P, Rozas I. Guanidine complexes of platinum: a theoretical study. J Phys Chem A 2014; 118:5540-7. [PMID: 24988181 DOI: 10.1021/jp504483x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have studied theoretically the complexes of model N-phenylguanidine/ium derivatives with PtCl3(-) and PtCl2 in different coordinating modes (mono- and bidentate) with different N atoms of the guanidine/ium moiety using the B3LYP/6-31+G** and LANL2DZ mixed basis set. This will aid the understanding of the complexation between platinum and the guanidine or guanidinium moiety in order to design dual anticancer agents that combine a guanidine-based DNA minor groove binder and a cisplatin-like moiety. Calculated interaction and relative energies, analysis of the electron density, and examination of the orbital interactions indicate that the most stable type of complex is that with a monodentate interaction between PtCl3(-) and guanidinium established through one of the NH2 groups. Next, we optimized the structure of three bis-guanidinium diaromatic systems developed in our group as DNA minor groove binders and their complexation with PtCl3(-), finding that the formation of Pt complexes of these minor groove binders is favorable and would produce stable monodentate coordinated systems.
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Affiliation(s)
- Marta Marin-Luna
- Departamento de Química Orgánica, Universidad de Murcia , Facultad de Química, Regional Campus of International Excellence "Campus Mare Nostrum", Espinardo, 30100 Murcia, Spain
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