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Nagaraj K, Priyanshi J, Govindasamy C, Sivakumar AS, Kamalesu S, Naman J, Dixitkumar M, Lokhandwala S, Parekh NM, Radha S, Uthra C, Vaishnavi E, Sakthinathan S, Chiu TW, Karuppiah C. Effect of hydrophobicity and size of the ligands on the intercalative binding interactions of some metallo-surfactants containing π-conjugated systems with yeast tRNA. J Biomol Struct Dyn 2024; 42:3949-3957. [PMID: 37254288 DOI: 10.1080/07391102.2023.2216783] [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: 02/12/2023] [Accepted: 05/16/2023] [Indexed: 06/01/2023]
Abstract
The intercalative yeast t-RNA binding behavior of some metallo-surfactant complexes, Co(ip)2(TA)2](ClO4)3 (1) and [Co(dpq)2(TA)2](ClO4)3 (2) where TA = Tetradecylamine (Myristylamine), ip = imidazo[4,5-f][1,10]phenanthroline and dpq = dipyrido[3,2-d:2'-3'-f]quinoxaline containing π-conjugated systems (both below and above critical micelle concentration) have been investigated by means of absorption spectral titration, competitive binding, circular dichroism, cyclic voltammetry, and viscometry measurements. Absorption spectral titration results implicate yeast tRNA has significant effects on the binding behaviors of two surfactant complexes via intercalative mode showed a significant absorption band of hypochromicity with red shift. The intrinsic binding constant values below and above CMC were determined as Kb = 6.12 × 105 M-1, 2.31 × 106 M-1, for complex (1) and 7.23 × 105 M-1, 3.57 × 106 M-1, for complex (2). In both sets of complexes (1) and (2), the complexes bind more strongly to yeast tRNA in the above critical micelle concentration can be hydrophobic and confirm intercalation. Competitive displacement studies confirmed that complexes bind to yeast tRNA via intercalative mode. Cyclic voltammetry studies suggest the increasing amounts of yeast tRNA, the cathodic potential Epc for the two complexes shows a positive shift in peak potential indicated the process of binding via intercalation. These observations were further validated by CD, and hydrodynamic measurements. All these studies suggesting that a surfactant complex binds to yeast tRNA appear to be mainly intercalative because of hydrophobicity due to extending aromaticity of the π system of the ligand and planarity of the complex has a significant effect on tRNA binding affinity increasing in the order of complexes containing ligands ip < dpq.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Karuppiah Nagaraj
- SRICT-Institute of Science and Research, Department of Chemistry, UPL University of Sustainable Technology, Vataria, India
| | - Jigeshkumar Priyanshi
- SRICT-Institute of Science and Research, Department of Chemistry, UPL University of Sustainable Technology, Vataria, India
| | - Chandramohan Govindasamy
- Department of Community Health Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Allur Subramaniyan Sivakumar
- Department of Orthopaedic Surgery, Dongtan Sacred Heart Hospital, Hallym University, College of Medicine, Hwaseong, Republic of Korea
| | - Supramanium Kamalesu
- Department of Chemistry, University of Science, Chandigarh University, Gharuan, India
| | - Jitendrabhai Naman
- SRICT-Institute of Science and Research, Department of Chemistry, UPL University of Sustainable Technology, Vataria, India
| | - Manojkumar Dixitkumar
- SRICT-Institute of Science and Research, Department of Chemistry, UPL University of Sustainable Technology, Vataria, India
| | - Snehal Lokhandwala
- Department of Environmental Science & Technology, UPL University of Sustainable Technology, Vataria, India
| | - Nikhil M Parekh
- SRICT-Institute of Science and Research, Department of Chemistry, UPL University of Sustainable Technology, Vataria, India
| | - Suriyan Radha
- Department of Chemistry, Saiva Bhanu Kshatriya College, Aruppukkottai, India
| | - Chandrabose Uthra
- Department of Microbiology, Bharathidasan University, Tiruchirapalli, India
| | - Ellappan Vaishnavi
- Department of Chemistry, Sri GVG Visalakshi College for Women, Udumalpet, India
| | - Subramanian Sakthinathan
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan, ROC
| | - Te-Wei Chiu
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan, ROC
| | - Chelladurai Karuppiah
- Battery Research Center for Green Energy, Ming Chi University of Technology, New Taipei City, Taiwan, ROC
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Parveen S, Jafri S, Yasir Khan H, Tabassum S, Arjmand F. Elucidating the interaction of enantiomeric Cu(II) complexes with DNA, RNA and HSA: A comparative study. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Gabelica V. Native Mass Spectrometry and Nucleic Acid G-Quadruplex Biophysics: Advancing Hand in Hand. Acc Chem Res 2021; 54:3691-3699. [PMID: 34546031 DOI: 10.1021/acs.accounts.1c00396] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
While studying nucleic acids to reveal the weak interactions responsible for their three-dimensional structure and for their interactions with drugs, we also contributed to the field of biomolecular mass spectrometry, both in terms of fundamental understanding and with new methodological developments. A first goal was to develop mass spectrometry approaches to detect noncovalent interactions between antitumor drugs and their DNA target. Twenty years ago, our attention turned toward specific DNA structures such as the G-quadruplex (a structure formed by guanine-rich strands). Mass spectrometry allows one to discern which molecules interact with one another by measuring the masses of the complexes, and quantify the affinities by measuring their abundance. The most important findings came from unexpected masses. For example, we showed the formation of higher- or lower-order structures by G-quadruplexes used in traditional biophysical assays. We also derived complete thermodynamic and kinetic description of G-quadruplex folding pathways by measuring cation binding, one at a time. Getting quantitative information requires accounting for nonspecific adduct formation and for the response factors of the different molecular forms. With these caveats in mind, the approach is now mature enough for routine biophysical characterization of nucleic acids. A second goal is to obtain more detailed structural information on each of the complexes separated by the mass spectrometer. One such approach is ion mobility spectrometry, and even today the challenge lies in the structural interpretation of the measurements. We showed that, although structures such as G-quadruplexes are well-preserved in the MS conditions, double helices actually get more compact in the gas phase. These major rearrangements forced us to challenge comfortable assumptions. Further work is still needed to generalize how to deduce structures in solution from ion mobility spectrometry data and, in particular, how to account for the electrospray charging mechanisms and for ion internal energy effects. These studies also called for complementary approaches to ion mobility spectrometry. Recently, we applied isotope exchange labeling mass spectrometry to characterize nucleic acid structures for the first time, and we reported the first ever circular dichroism ion spectroscopy measurement on mass-selected trapped ions. Circular dichroism plays a key role in assigning the stacking topology, and our new method now opens the door to characterizing a wide variety of chiral molecules by mass spectrometry. In summary, advanced mass spectrometry approaches to characterize gas-phase structures work well for G-quadruplexes because they are stiffened by inner cations. The next objective will be to generalize these methodologies to a wider range of nucleic acid structures.
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Affiliation(s)
- Valérie Gabelica
- Université de Bordeaux, CNRS, INSERM,
ARNA, UMR 5320, U1212, IECB, F-33600 Pessac, France
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Lahiri D, Nag M, Dutta B, Dey S, Mukherjee D, Joshi SJ, Ray RR. Antibiofilm and anti-quorum sensing activities of eugenol and linalool from Ocimum tenuiflorum against Pseudomonas aeruginosa biofilm. J Appl Microbiol 2021; 131:2821-2837. [PMID: 34077580 DOI: 10.1111/jam.15171] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 05/11/2021] [Accepted: 05/28/2021] [Indexed: 12/16/2022]
Abstract
AIMS The aim of this study is to determine the ability of two bioactive compounds, namely, eugenol and linalool, purified from leaves of Ocimum tenuiflorum for eradication of biofilm produced by Pseudomonas aeruginosa. METHODS AND RESULTS The phytoextract of O. tenuiflorum (KT), a common ethno-botanical plant of India, was purified through high-performance liquid chromatography and was analysed using ultraviolet (UV) spectroscopy and gas chromatography-mass spectrometry (GC-MS). Eugenol and linalool were found to be the most active amongst all phytocompounds present in phytoextract and showed a significant reduction in the viability of sessile cells of P. aeruginosa and the minimum revival after withdrawal of phyto-challenge. They could bring about notable reduction in the protein and carbohydrate content of exopolysaccharide of biofilm. Eugenol and linalool could affect the synthesis of quorum sensing (QS) proteins like LasA and LasB as well as virulence factors such as pyocyanin, and rhamnolipids, which seriously hamper the formation of biofilm. The biofilm framework was extremely affected by the phytocompounds through the reduction of protein and carbohydrate content of extracellular polymeric substance (EPS). Another interesting found out was that they brought about maximum inhibition to the genomic DNA and RNA content. The studies were supported by in silico interaction between eugenol and linalool with the QS proteins. The antibiofilm efficacies of eugenol, linalool and phytoextract (KT) were further confirmed by microscopic studies with scanning electron microscopy (SEM), atomic force microscopy and fluorescence confocal microscopy microscopic studies. CONCLUSIONS The phytocompounds are proved to be more effective than conventional antibiotics in inhibiting the biofilm forming sessile cells and can be used as a replacement for antibiotic. SIGNIFICANCE AND IMPACT OF THE STUDY Pure eugenol extracted from common basil leaves can be used as a safe substitute for common antibiotic for treatment of chronic infections caused by P. aeruginosa. It will be cost effective, devoid of notable side effects and will not generate antibiotic resistance in host body.
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Affiliation(s)
- D Lahiri
- Department of Biotechnology, University of Engineering and Management, Kolkata, India
| | - M Nag
- Department of Biotechnology, University of Engineering and Management, Kolkata, India
| | - B Dutta
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Kolkata, India
| | - S Dey
- Department of Biotechnology, University of Engineering and Management, Kolkata, India
| | - D Mukherjee
- Department of Biotechnology, University of Engineering and Management, Kolkata, India
| | - S J Joshi
- Oil and Gas Research Center, Central Analytical and Applied Research Unit, Sultan Qaboos University, Muscat, Oman
| | - R R Ray
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Kolkata, India
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Lahiri D, Nag M, Dutta B, Mukherjee I, Ghosh S, Dey A, Banerjee R, Ray RR. Catechin as the Most Efficient Bioactive Compound from Azadirachta indica with Antibiofilm and Anti-quorum Sensing Activities Against Dental Biofilm: an In Vitro and In Silico Study. Appl Biochem Biotechnol 2021; 193:1617-1630. [PMID: 33496925 DOI: 10.1007/s12010-021-03511-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Accepted: 01/18/2021] [Indexed: 10/22/2022]
Abstract
Neem (Azadirachta indica [AI]) is a unique and traditional source of antioxidant and antibacterial compounds. The GC-MS studies revealed that phytoextract of Azadirachta indica comprises a large number of phytocompounds that possess the efficacy of inhibiting the biofilm. It was observed that phytocompounds like catechin showed maximum eradication of biofilm along with the degradation of EPS structural components like carbohydrates and proteins compared to quercetin, nimbolide, nimbin, and azardirachtin, and hence, catechin was proved to be the best against dental plaque-forming bacteria. It was also observed that catechin was able to bring about a marked reduction in quorum sensing (QS) both in Alcaligenes faecalis and Pseudomonas gingivalis dental biofilm-forming strains. The extent of such reduction was maximum for catechin (94.56±2.56% in P. gingivalis & 96.56±2.5 in A. faecalis) in comparison to other bioactive compounds. It was further observed that the bioactive compounds possess the ability to quickly pass across the membrane and bring about inhibition in the DNA and RNA content of the sessile cells. This was further validated by microscopic and in silico studies. Thus, this study revealed that catechin obtained from the phytoextract of AI showed a marked ability to inhibit the dental biofilm and can be used as a natural drug-like compound in treating biofilm-associated chronic infections.
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Affiliation(s)
- Dibyajit Lahiri
- Department of Biotechnology, University of Engineering & Management, Kolkata, West Bengal, India
| | - Moupriya Nag
- Department of Biotechnology, University of Engineering & Management, Kolkata, West Bengal, India
| | - Bandita Dutta
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Haringhata, West Bengal, India
| | - Indranil Mukherjee
- Department of Biotechnology, University of Engineering & Management, Kolkata, West Bengal, India
| | - Shreyasi Ghosh
- Department of Biotechnology, University of Engineering & Management, Kolkata, West Bengal, India
| | - Ankita Dey
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Haringhata, West Bengal, India
| | - Ritwik Banerjee
- Department of Biotechnology, University of Engineering & Management, Kolkata, West Bengal, India
| | - Rina Rani Ray
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, Haringhata, West Bengal, India.
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Botti V, Urbanelli L, Sagini K, Tarpani L, Cesaretti A, Fortuna CG, Elisei F. Quaternized styryl-azinium fluorophores as cellular RNA-binders. Photochem Photobiol Sci 2020; 19:362-370. [PMID: 32147676 DOI: 10.1039/c9pp00465c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The capability of three quaternized styryl-azinium iodides to bind cellular RNA has been tested by means of Fluorescence Confocal Microscopy imaging of stained MCF-7 cells treated with RNase. Their association constants have been estimated through spectrophotometric and fluorimetric titrations with tRNA and compared to their affinity toward DNA. Transient absorption spectroscopy with femtosecond resolution confirmed the binding of the investigated compounds with tRNA and shed new light on the excited state dynamics of their complexes, by revealing a significant lengthening of the lifetime of S1 upon complexation, which parallels the fluorescence quantum yield enhancement.
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Affiliation(s)
- Valentina Botti
- Department of Chemistry, Biology and Biotechnology and Center of Excellence on Innovative Nanostructured Materials (CEMIN), University of Perugia, via Elce di Sotto 8, 06123, Perugia, Italy.
| | - Lorena Urbanelli
- Department of Chemistry, Biology and Biotechnology, University of Perugia, via del Giochetto, 06126, Perugia, Italy
| | - Krizia Sagini
- Department of Chemistry, Biology and Biotechnology, University of Perugia, via del Giochetto, 06126, Perugia, Italy
| | - Luigi Tarpani
- Department of Chemistry, Biology and Biotechnology and Center of Excellence on Innovative Nanostructured Materials (CEMIN), University of Perugia, via Elce di Sotto 8, 06123, Perugia, Italy
| | - Alessio Cesaretti
- Department of Chemistry, Biology and Biotechnology and Center of Excellence on Innovative Nanostructured Materials (CEMIN), University of Perugia, via Elce di Sotto 8, 06123, Perugia, Italy
| | - Cosimo G Fortuna
- Department of Chemical Sciences, University of Catania, viale Andrea Doria 6, 95125, Catania, Italy
| | - Fausto Elisei
- Department of Chemistry, Biology and Biotechnology and Center of Excellence on Innovative Nanostructured Materials (CEMIN), University of Perugia, via Elce di Sotto 8, 06123, Perugia, Italy
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Jadhav RW, Kobaisi MA, Jones LA, Vinu A, Bhosale SV. The Supramolecular Self-Assembly of Aminoglycoside Antibiotics and their Applications. ChemistryOpen 2019; 8:1154-1166. [PMID: 31497469 PMCID: PMC6718072 DOI: 10.1002/open.201900193] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 07/23/2019] [Indexed: 12/11/2022] Open
Abstract
Aminoglycosides, a class of antibiotics that includes gentamicin, kanamycin, neomycin, streptomycin, tobramycin and apramycin, are derived from various streptomyces species. Despite the significant increase in the antibacterial resistant pathogens, aminoglycosides remain an important class of antimicrobial drugs due to their unique chemical structure which offers a broad spectrum of activity. The modification of antibiotics and their subsequent use in supramolecular chemistry is rarely reported. Given the importance of aminoglycosides, here we give a brief overview on the modification of 4,5- and 4,6-disubstituted deoxystreptamine classes of aminoglycosides through supramolecular chemistry and their potential for real world applications. We also make the case that the work in this area is gaining momentum, and there are significant opportunities to meet the challenges of modern antibiotics through the modification of aminoglycosides by harnessing the advantages of supramolecular chemistry.
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Affiliation(s)
- Ratan W. Jadhav
- School of Chemical SciencesGoa University Taleigao PlateauGoa403 206INDIA
| | - Mohammad Al Kobaisi
- School of Science, Faculty of Science, Engineering and TechnologySwinburne University of TechnologyHawthornAustralia
| | - Lathe A. Jones
- CAMIC, School of ScienceRMIT University, GPO Box2476Melbourne, VIC-3001Australia
| | - Ajayan Vinu
- Global Innovative Center for Advanced Nanomaterials (GICAN)The University of Newcastle (UON), University Drive, CallaghanNSW 2308Australia
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8
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Shortridge MD, Wille PT, Jones AN, Davidson A, Bogdanovic J, Arts E, Karn J, Robinson JA, Varani G. An ultra-high affinity ligand of HIV-1 TAR reveals the RNA structure recognized by P-TEFb. Nucleic Acids Res 2019; 47:1523-1531. [PMID: 30481318 PMCID: PMC6379670 DOI: 10.1093/nar/gky1197] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 11/09/2018] [Accepted: 11/23/2018] [Indexed: 12/16/2022] Open
Abstract
The HIV-1 trans-activator protein Tat binds the trans-activation response element (TAR) to facilitate recruitment of the super elongation complex (SEC) to enhance transcription of the integrated pro-viral genome. The Tat–TAR interaction is critical for viral replication and the emergence of the virus from the latent state, therefore, inhibiting this interaction has long been pursued to discover new anti-viral or latency reversal agents. However, discovering active compounds that directly target RNA with high affinity and selectivity remains a significant challenge; limiting pre-clinical development. Here, we report the rational design of a macrocyclic peptide mimic of the arginine rich motif of Tat, which binds to TAR with low pM affinity and 100-fold selectivity against closely homologous RNAs. Despite these unprecedented binding properties, the new ligand (JB181) only moderately inhibits Tat-dependent reactivation in cells and recruitment of positive transcription elongation factor (P-TEFb) to TAR. The NMR structure of the JB181–TAR complex revealed that the ligand induces a structure in the TAR loop that closely mimics the P-TEFb/Tat1:57/AFF4/TAR complex. These results strongly suggest that high-affinity ligands which bind the UCU bulge are not likely to inhibit recruitment of the SEC and suggest that targeting of the TAR loop will be an essential feature of effective Tat inhibitors.
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Affiliation(s)
- Matthew D Shortridge
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700
| | - Paul T Wille
- Department of Molecular Biology and Microbiology, Case Western Reserve University, Cleveland, Ohio 44106-4960
| | - Alisha N Jones
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700
| | - Amy Davidson
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700
| | - Jasmina Bogdanovic
- Department of Chemistry, University of Zurich, Zurich, Switzerland CH-8057
| | - Eric Arts
- Department of Molecular Biology and Microbiology, Case Western Reserve University, Cleveland, Ohio 44106-4960
| | - Jonathan Karn
- Department of Molecular Biology and Microbiology, Case Western Reserve University, Cleveland, Ohio 44106-4960
| | - John A Robinson
- Department of Chemistry, University of Zurich, Zurich, Switzerland CH-8057
| | - Gabriele Varani
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700
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9
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Accuracy of MD solvent models in RNA structure refinement assessed via liquid-crystal NMR and spin relaxation data. J Struct Biol 2019; 207:250-259. [PMID: 31279068 DOI: 10.1016/j.jsb.2019.07.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 06/24/2019] [Accepted: 07/01/2019] [Indexed: 11/20/2022]
Abstract
Molecular dynamics (MD) simulations play an important role in characterizing Ribonucleic Acid (RNA) structure, augmenting information from experimental techniques such as Nuclear Magnetic Resonance (NMR). In this work, we examine the accuracy of structural representation resulting from application of a number of explicit and implicit solvent models and refinement protocols against experimental data ranging from high density of residual dipolar coupling (RDC) restraints to completely unrestrained simulations. For a prototype A-form RNA helix, our results indicate that AMBER RNA force field with either implicit or explicit solvent can produce a realistic dynamic representation of RNA helical structure, accurately cross-validating with respect to a diverse array of NMR observables. In refinement against NMR distance restraints, modern MD force fields are found to be equally adequate, with high fidelity cross-validation to the residual dipolar couplings (RDCs) and residual chemical shift anisotropies (RCSAs), while slightly over-estimating structural order as monitored via NMR relaxation data. With restraints trimmed to encode only for base pairing information, cross-validation quality significantly deteriorates, now exhibiting a pronounced dependence on the choice of the solvent model. This deterioration is found to be partially reversible by increasing planarity restraints on the nucleobase geometry. For completely unrestrained MD simulations, the choice of water model becomes very important, with the best-performing TIP4P-Ew accurately reproducing both the RDC and RCSA data, while closely matching the NMR-derived order parameters. The information provided here will serve as a foundation for MD-based refinement of solution state NMR structures of RNA.
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Khavani M, Izadyar M, Housaindokht MR. RNA aptasensor based on gold nanoparticles for selective detection of neomycin B, molecular approach. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2019. [DOI: 10.1007/s13738-019-01708-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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11
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Arjmand F, Afsan Z, Sharma S, Parveen S, Yousuf I, Sartaj S, Siddique HR, Tabassum S. Recent advances in metallodrug-like molecules targeting non-coding RNAs in cancer chemotherapy. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.02.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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12
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Plumridge A, Katz AM, Calvey GD, Elber R, Kirmizialtin S, Pollack L. Revealing the distinct folding phases of an RNA three-helix junction. Nucleic Acids Res 2018; 46:7354-7365. [PMID: 29762712 PMCID: PMC6101490 DOI: 10.1093/nar/gky363] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 04/17/2018] [Accepted: 04/24/2018] [Indexed: 01/08/2023] Open
Abstract
Remarkable new insight has emerged into the biological role of RNA in cells. RNA folding and dynamics enable many of these newly discovered functions, calling for an understanding of RNA self-assembly and conformational dynamics. Because RNAs pass through multiple structures as they fold, an ensemble perspective is required to visualize the flow through fleetingly populated sets of states. Here, we combine microfluidic mixing technology and small angle X-ray scattering (SAXS) to measure the Mg-induced folding of a small RNA domain, the tP5abc three helix junction. Our measurements are interpreted using ensemble optimization to select atomically detailed structures that recapitulate each experimental curve. Structural ensembles, derived at key stages in both time-resolved studies and equilibrium titrations, reproduce the features of known intermediates, and more importantly, offer a powerful new structural perspective on the time-progression of folding. Distinct collapse phases along the pathway appear to be orchestrated by specific interactions with Mg ions. These key interactions subsequently direct motions of the backbone that position the partners of tertiary contacts for later bonding, and demonstrate a remarkable synergy between Mg and RNA across numerous time-scales.
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Affiliation(s)
- Alex Plumridge
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
| | - Andrea M Katz
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
| | - George D Calvey
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
| | - Ron Elber
- Department of Chemistry and Institute for Computational Engineering and Sciences (ICES) University of Texas at Austin, Austin, TX, USA
| | - Serdal Kirmizialtin
- Chemistry Program, Science Division, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | - Lois Pollack
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA
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13
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Rajendiran N, Suresh M. Study of the Interaction of Ciprofloxacin and Sparfloxacin with Biomolecules by Spectral, Electrochemical and Molecular Docking Methods. ACTA ACUST UNITED AC 2018. [DOI: 10.18052/www.scipress.com/ilcpa.78.1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Interactions of ciprofloxacin and sparfloxacin with different biomolecules (DNA, RNA and BSA) are investigated by UV–Visible spectroscopy, fluorescence spectroscopy, cyclic voltammetry and molecular docking methods. Upon increasing the concentration of the biomolecules, the absorption maxima of ciprofloxacin and sparfloxacin are red shifted in the aqueous solutions whereas red or blue shift noticed in the fluorescence spectra. The negative free energy changes suggest that the interaction processes are spontaneous. Cyclic voltammetry results suggested that when the drug concentration is increased, the anodic electrode potential increased. Molecular docking results showed that hydrophobic forces, electrostatic interactions, and hydrogen bonds played vital roles in the interaction drugs with biomolecules. The molecular docking calculation clarifies the binding mode and the binding sites are in good accordance with the experiment results.
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14
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Cieślik M, Chinnaiyan AM. Cancer transcriptome profiling at the juncture of clinical translation. Nat Rev Genet 2017; 19:93-109. [PMID: 29279605 DOI: 10.1038/nrg.2017.96] [Citation(s) in RCA: 156] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Methodological breakthroughs over the past four decades have repeatedly revolutionized transcriptome profiling. Using RNA sequencing (RNA-seq), it has now become possible to sequence and quantify the transcriptional outputs of individual cells or thousands of samples. These transcriptomes provide a link between cellular phenotypes and their molecular underpinnings, such as mutations. In the context of cancer, this link represents an opportunity to dissect the complexity and heterogeneity of tumours and to discover new biomarkers or therapeutic strategies. Here, we review the rationale, methodology and translational impact of transcriptome profiling in cancer.
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Affiliation(s)
- Marcin Cieślik
- Michigan Center for Translational Pathology, University of Michigan.,Department of Pathology, University of Michigan
| | - Arul M Chinnaiyan
- Michigan Center for Translational Pathology, University of Michigan.,Department of Pathology, University of Michigan.,Comprehensive Cancer Center, University of Michigan.,Department of Urology, University of Michigan.,Howard Hughes Medical Institute, University of Michigan, Ann Arbor, Michigan 48109, USA
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15
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Yu Z, Cowan JA. Catalytic Metallodrugs: Substrate-Selective Metal Catalysts as Therapeutics. Chemistry 2017; 23:14113-14127. [PMID: 28688119 DOI: 10.1002/chem.201701714] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Indexed: 12/13/2022]
Affiliation(s)
- Zhen Yu
- Department of Chemistry and Biochemistry; The Ohio State University; 100 West 18th Avenue Columbus OH 43210 USA
| | - James A. Cowan
- Department of Chemistry and Biochemistry; The Ohio State University; 100 West 18th Avenue Columbus OH 43210 USA
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Dersch P, Khan MA, Mühlen S, Görke B. Roles of Regulatory RNAs for Antibiotic Resistance in Bacteria and Their Potential Value as Novel Drug Targets. Front Microbiol 2017; 8:803. [PMID: 28529506 PMCID: PMC5418344 DOI: 10.3389/fmicb.2017.00803] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 04/19/2017] [Indexed: 01/23/2023] Open
Abstract
The emergence of antibiotic resistance mechanisms among bacterial pathogens increases the demand for novel treatment strategies. Lately, the contribution of non-coding RNAs to antibiotic resistance and their potential value as drug targets became evident. RNA attenuator elements in mRNA leader regions couple expression of resistance genes to the presence of the cognate antibiotic. Trans-encoded small RNAs (sRNAs) modulate antibiotic tolerance by base-pairing with mRNAs encoding functions important for resistance such as metabolic enzymes, drug efflux pumps, or transport proteins. Bacteria respond with extensive changes of their sRNA repertoire to antibiotics. Each antibiotic generates a unique sRNA profile possibly causing downstream effects that may help to overcome the antibiotic challenge. In consequence, regulatory RNAs including sRNAs and their protein interaction partners such as Hfq may prove useful as targets for antimicrobial chemotherapy. Indeed, several compounds have been developed that kill bacteria by mimicking ligands for riboswitches controlling essential genes, demonstrating that regulatory RNA elements are druggable targets. Drugs acting on sRNAs are considered for combined therapies to treat infections. In this review, we address how regulatory RNAs respond to and establish resistance to antibiotics in bacteria. Approaches to target RNAs involved in intrinsic antibiotic resistance or virulence for chemotherapy will be discussed.
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Affiliation(s)
- Petra Dersch
- Department of Molecular Infection Biology, Helmholtz Centre for Infection ResearchBraunschweig, Germany
| | - Muna A Khan
- Department of Microbiology, Immunobiology and Genetics, Max F. Perutz Laboratories, University of ViennaVienna, Austria
| | - Sabrina Mühlen
- Department of Molecular Infection Biology, Helmholtz Centre for Infection ResearchBraunschweig, Germany
| | - Boris Görke
- Department of Microbiology, Immunobiology and Genetics, Max F. Perutz Laboratories, University of ViennaVienna, Austria
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17
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Affiliation(s)
- Amanda L. Garner
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, Michigan USA
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18
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Jeong WJ, Kye M, Han SH, Choi JS, Lim YB. Inhibition of Multimolecular RNA-Protein Interactions Using Multitarget-Directed Nanohybrid System. ACS APPLIED MATERIALS & INTERFACES 2017; 9:11537-11545. [PMID: 28287257 DOI: 10.1021/acsami.7b01517] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Multitarget-directed ligands (MTDLs) are hybrid ligands obtained by covalently linking active pharmacophores that can act on different targets. We envision that the concept of MTDLs can also be applied to supramolecular bioinorganic nanohybrid systems. Here, we report the inhibition of multimolecular RNA-protein complexes using multitarget-directed peptide-carbon nanotube hybrids (SPCHs). One of the most well-characterized and important RNA-protein interactions, a Rev-response element (RRE) RNA:Rev protein:Crm1 protein interaction system in human immunodeficiency virus type-1, was used as a model of multimolecular RNA-protein interactions. Although all previous studies have targeted only one of the interaction interfaces, that is, either the RRE:Rev interface or the RRE-Rev complex:Crm1 interface, we here have developed multitarget-directed SPCHs that could target both interfaces because the supramolecular nanosystem could be best suited for inhibiting multimolecular RNA-protein complexes that are characterized by large and complex molecular interfaces. The results showed that the single target-directed SPCHs were inhibitory to the single interface comprised only of RNA and protein in vitro, whereas multitarget-directed SPCHs were inhibitory to the multimolecular RNA-protein interfaces both in vitro and in cellulo. The MTDL nanohybrids represent a novel nanotherapeutic system that could be used to treat complex disease targets.
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Affiliation(s)
- Woo-Jin Jeong
- Department of Materials Science & Engineering, Yonsei University , Seoul 03722, Korea
| | - Mahnseok Kye
- Department of Materials Science & Engineering, Yonsei University , Seoul 03722, Korea
| | - So-Hee Han
- Department of Materials Science & Engineering, Yonsei University , Seoul 03722, Korea
| | - Jun Shik Choi
- Department of Materials Science & Engineering, Yonsei University , Seoul 03722, Korea
| | - Yong-Beom Lim
- Department of Materials Science & Engineering, Yonsei University , Seoul 03722, Korea
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19
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Gallego-Paez LM, Bordone MC, Leote AC, Saraiva-Agostinho N, Ascensão-Ferreira M, Barbosa-Morais NL. Alternative splicing: the pledge, the turn, and the prestige : The key role of alternative splicing in human biological systems. Hum Genet 2017; 136:1015-1042. [PMID: 28374191 PMCID: PMC5602094 DOI: 10.1007/s00439-017-1790-y] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 03/25/2017] [Indexed: 02/06/2023]
Abstract
Alternative pre-mRNA splicing is a tightly controlled process conducted by the spliceosome, with the assistance of several regulators, resulting in the expression of different transcript isoforms from the same gene and increasing both transcriptome and proteome complexity. The differences between alternative isoforms may be subtle but enough to change the function or localization of the translated proteins. A fine control of the isoform balance is, therefore, needed throughout developmental stages and adult tissues or physiological conditions and it does not come as a surprise that several diseases are caused by its deregulation. In this review, we aim to bring the splicing machinery on stage and raise the curtain on its mechanisms and regulation throughout several systems and tissues of the human body, from neurodevelopment to the interactions with the human microbiome. We discuss, on one hand, the essential role of alternative splicing in assuring tissue function, diversity, and swiftness of response in these systems or tissues, and on the other hand, what goes wrong when its regulatory mechanisms fail. We also focus on the possibilities that splicing modulation therapies open for the future of personalized medicine, along with the leading techniques in this field. The final act of the spliceosome, however, is yet to be fully revealed, as more knowledge is needed regarding the complex regulatory network that coordinates alternative splicing and how its dysfunction leads to disease.
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Affiliation(s)
- L M Gallego-Paez
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - M C Bordone
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - A C Leote
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - N Saraiva-Agostinho
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - M Ascensão-Ferreira
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - N L Barbosa-Morais
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal.
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20
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Miller TE, Gomez-Cambronero J. A feedback mechanism between PLD and deadenylase PARN for the shortening of eukaryotic poly(A) mRNA tails that is deregulated in cancer cells. Biol Open 2017; 6:176-186. [PMID: 28011629 PMCID: PMC5312095 DOI: 10.1242/bio.021261] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The removal of mRNA transcript poly(A) tails by 3′→5′ exonucleases is the rate-limiting step in mRNA decay in eukaryotes. Known cellular deadenylases are the CCR4-NOT and PAN complexes, and poly(A)-specific ribonuclease (PARN). The physiological roles and regulation for PARN is beginning to be elucidated. Since phospholipase D (PLD2 isoform) gene expression is upregulated in breast cancer cells and PARN is downregulated, we examined whether a signaling connection existed between these two enzymes. Silencing PARN with siRNA led to an increase in PLD2 protein, whereas overexpression of PARN had the opposite effect. Overexpression of PLD2, however, led to an increase in PARN expression. Thus, PARN downregulates PLD2 whereas PLD2 upregulates PARN. Co-expression of both PARN and PLD2 mimicked this pattern in non-cancerous cells (COS-7 fibroblasts) but, surprisingly, not in breast cancer MCF-7 cells, where PARN switches from inhibition to activation of PLD2 gene and protein expression. Between 30 and 300 nM phosphatidic acid (PA), the product of PLD enzymatic reaction, added exogenously to culture cells had a stabilizing role of both PARN and PLD2 mRNA decay. Lastly, by immunofluorescence microscopy, we observed an intracellular co-localization of PA-loaded vesicles (0.1-1 nm) and PARN. In summary, we report for the first time the involvement of a phospholipase (PLD2) and PA in mediating PARN-induced eukaryotic mRNA decay and the crosstalk between the two enzymes that is deregulated in breast cancer cells. Summary: Cell signaling enzyme phospholipase D2 (PLD2) and its reaction product, phospholipid phosphatidic acid (PA), are involved in mediating PARN-induced eukaryotic mRNA decay.
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Affiliation(s)
- Taylor E Miller
- Department of Biochemistry and Molecular Biology, Wright State University School of Medicine, Dayton, OH 45435, USA
| | - Julian Gomez-Cambronero
- Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA .,Department of Biochemistry and Molecular Biology, Wright State University School of Medicine, Dayton, OH 45435, USA
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21
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Murata A, Otabe T, Zhang J, Nakatani K. BzDANP, a Small-Molecule Modulator of Pre-miR-29a Maturation by Dicer. ACS Chem Biol 2016; 11:2790-2796. [PMID: 27536863 DOI: 10.1021/acschembio.6b00214] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We here report the synthesis of novel molecule BzDANP having a three-ring benzo[c][1,8]naphthyridine system, the evaluation of its binding properties to a single nucleotide bulge in RNA duplexes, and BzDANP-induced suppression of pre-miR-29a processing by Dicer. BzDANP showed much increased affinity to the bulged RNAs as compared with the parent molecule DANP, which possesses the same hydrogen-bonding surface as BzDANP but in a two-ring [1,8]naphthyridine system. Melting temperature analysis of bulged RNAs showed that BzDANP most effectively stabilized the C-bulged RNA. Dicer-mediated processing of pre-miR-29a was suppressed by BzDANP in a concentration dependent manner. The presence of the C-bulge at the Dicer cleavage site was effective for the suppression of pre-miR-29a processing by BzDANP. These results demonstrated that the small molecule binding to the bulged site in the vicinity of the Dicer cleavage site could be a potential modulator for the maturation of pre-miRNA.
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Affiliation(s)
- Asako Murata
- Department of Regulatory
Bioorganic Chemistry, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Takahiro Otabe
- Department of Regulatory
Bioorganic Chemistry, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Jinhua Zhang
- Department of Regulatory
Bioorganic Chemistry, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Kazuhiko Nakatani
- Department of Regulatory
Bioorganic Chemistry, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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22
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Ray B, Agarwal S, Kadian H, Gambhir K, Sharma P, Mehrotra R. Deciphering molecular aspects of interaction between anticancer drug mitoxantrone and tRNA. J Biomol Struct Dyn 2016; 35:2090-2102. [DOI: 10.1080/07391102.2016.1213185] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Bhumika Ray
- Academy of Scientific & Innovative Research (AcSIR), CSIR-National Physical Laboratory Campus, New Delhi 110012, India
- Quantum Phenomena and Applications, CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
| | - Shweta Agarwal
- Academy of Scientific & Innovative Research (AcSIR), CSIR-National Physical Laboratory Campus, New Delhi 110012, India
- Quantum Phenomena and Applications, CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
| | - Heena Kadian
- Quantum Phenomena and Applications, CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
| | - Kaweri Gambhir
- Academy of Scientific & Innovative Research (AcSIR), CSIR-National Physical Laboratory Campus, New Delhi 110012, India
- Quantum Phenomena and Applications, CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
| | - Parag Sharma
- Academy of Scientific & Innovative Research (AcSIR), CSIR-National Physical Laboratory Campus, New Delhi 110012, India
- Quantum Phenomena and Applications, CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
| | - Ranjana Mehrotra
- Academy of Scientific & Innovative Research (AcSIR), CSIR-National Physical Laboratory Campus, New Delhi 110012, India
- Quantum Phenomena and Applications, CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
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23
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Structural and thermodynamic analysis of the binding of tRNAphe by the putative anticancer alkaloid chelerythrine: Spectroscopy, calorimetry and molecular docking studies. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 161:335-44. [DOI: 10.1016/j.jphotobiol.2016.05.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 05/27/2016] [Indexed: 12/15/2022]
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24
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Hermann T. Small molecules targeting viral RNA. WILEY INTERDISCIPLINARY REVIEWS-RNA 2016; 7:726-743. [PMID: 27307213 PMCID: PMC7169885 DOI: 10.1002/wrna.1373] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 04/29/2016] [Accepted: 05/23/2016] [Indexed: 02/06/2023]
Abstract
Highly conserved noncoding RNA (ncRNA) elements in viral genomes and transcripts offer new opportunities to expand the repertoire of drug targets for the development of antiinfective therapy. Ligands binding to ncRNA architectures are able to affect interactions, structural stability or conformational changes and thereby block processes essential for viral replication. Proof of concept for targeting functional RNA by small molecule inhibitors has been demonstrated for multiple viruses with RNA genomes. Strategies to identify antiviral compounds as inhibitors of ncRNA are increasingly emphasizing consideration of drug‐like properties of candidate molecules emerging from screening and ligand design. Recent efforts of antiviral lead discovery for RNA targets have provided drug‐like small molecules that inhibit viral replication and include inhibitors of human immunodeficiency virus (HIV), hepatitis C virus (HCV), severe respiratory syndrome coronavirus (SARS CoV), and influenza A virus. While target selectivity remains a challenge for the discovery of useful RNA‐binding compounds, a better understanding is emerging of properties that define RNA targets amenable for inhibition by small molecule ligands. Insight from successful approaches of targeting viral ncRNA in HIV, HCV, SARS CoV, and influenza A will provide a basis for the future exploration of RNA targets for therapeutic intervention in other viral pathogens which create urgent, unmet medical needs. Viruses for which targeting ncRNA components in the genome or transcripts may be promising include insect‐borne flaviviruses (Dengue, Zika, and West Nile) and filoviruses (Ebola and Marburg). WIREs RNA 2016, 7:726–743. doi: 10.1002/wrna.1373 This article is categorized under:
RNA Structure and Dynamics > Influence of RNA Structure in Biological Systems RNA Interactions with Proteins and Other Molecules > Small Molecule–RNA Interactions Regulatory RNAs/RNAi/Riboswitches > Regulatory RNAs
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Affiliation(s)
- Thomas Hermann
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA. .,Center for Drug Discovery Innovation, University of California, San Diego, La Jolla, CA, USA.
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25
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Sinoy S, Fayaz SM, Charles KD, Suvanish VK, Kapfhammer JP, Rajanikant GK. Amikacin Inhibits miR-497 Maturation and Exerts Post-ischemic Neuroprotection. Mol Neurobiol 2016; 54:3683-3694. [DOI: 10.1007/s12035-016-9940-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2015] [Accepted: 05/11/2016] [Indexed: 10/25/2022]
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26
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Ling K, Jiang H, Zhang L, Li Y, Yang L, Qiu C, Li FR. A self-assembling RNA aptamer-based nanoparticle sensor for fluorometric detection of Neomycin B in milk. Anal Bioanal Chem 2016; 408:3593-600. [PMID: 26942739 DOI: 10.1007/s00216-016-9441-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2015] [Revised: 01/30/2016] [Accepted: 02/22/2016] [Indexed: 11/29/2022]
Abstract
To date, there are few reports regarding the development of RNA aptamer-based biosensors for the detection of small molecules. The possible reason is attributed to the weak nuclease resistance of RNA in biological environments. In this study, we have developed an RNA aptamer-based gold nanoparticle (AuNP) sensor for fluorometric detection of Neomycin B in milk. This aptasensor depends on the self-assembly of the RNA aptamer/Neomycin B complex and fluorescence quenching by AuNPs. This biosensor exhibited a low detection limit of 0.01 μM, with a linear dynamic range from 0.1 to 10 μM in milk, and a good selectivity toward Neomycin B. Specifically, because of the shorter RNA fragments and the nuclease inhibition ability of the RNA-modified AuNPs, the RNA sequences remained stable during the experiments. This work will serve as an example for the development of novel biosensors based on RNA aptamers. Graphical Abstract An RNA aptamer-based nanoparticle sensor, developed for the detection of Neomycin B in milk, shows high binding affinity and selectivity. This aptasensor depends on the self-assembly of the aptamer/ligand complex and fluorescence quenching by gold nanoparticles (AuNPs). Because of the shorter RNA fragments and the nuclease inhibition ability of RNA-modified AuNPs, RNA sequences remain stable during the detection.
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Affiliation(s)
- Kai Ling
- The Second Clinical Medical College (Shenzhen People's Hospital), Jinan University, No. 1017 Dongmen North Road, Shenzhen, 518020, China.,School of Medicine, Jinan University, Guangzhou, 510632, China.,Shenzhen Institute of Geriatrics, Shenzhen, 518020, China
| | - Hongyan Jiang
- Institute of Biomedical Engineering, Key Laboratory of Biomedical Material of Tianjin, Chinese Academy of Medical Sciences & Peking Union Medical College, 236 Baidi Road Nankai District, Tianjin, Tianjin, 300192, China
| | - Linlin Zhang
- Department of Nuclear Medicine, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, 227 South Chongqing Road, Shanghai, 200092, China
| | - Yang Li
- The Second Clinical Medical College (Shenzhen People's Hospital), Jinan University, No. 1017 Dongmen North Road, Shenzhen, 518020, China.,School of Medicine, Jinan University, Guangzhou, 510632, China
| | - Lu Yang
- The Second Clinical Medical College (Shenzhen People's Hospital), Jinan University, No. 1017 Dongmen North Road, Shenzhen, 518020, China.,School of Medicine, Jinan University, Guangzhou, 510632, China
| | - Chen Qiu
- The Second Clinical Medical College (Shenzhen People's Hospital), Jinan University, No. 1017 Dongmen North Road, Shenzhen, 518020, China
| | - Fu-Rong Li
- The Second Clinical Medical College (Shenzhen People's Hospital), Jinan University, No. 1017 Dongmen North Road, Shenzhen, 518020, China. .,School of Medicine, Jinan University, Guangzhou, 510632, China.
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27
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Fukuzumi T, Murata A, Aikawa H, Harada Y, Nakatani K. Exploratory Study on the RNA-Binding Structural Motifs by Library Screening Targeting pre-miRNA-29 a. Chemistry 2015; 21:16859-67. [DOI: 10.1002/chem.201502913] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Indexed: 12/31/2022]
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28
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Schudoma C. It's a loop world - single strands in RNA as structural and functional elements. Biomol Concepts 2015; 2:171-81. [PMID: 25962027 DOI: 10.1515/bmc.2011.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Accepted: 03/25/2011] [Indexed: 01/31/2023] Open
Abstract
Unpaired regions in RNA molecules - loops - are centrally involved in defining the characteristic three-dimensional (3D) architecture of RNAs and are of high interest in RNA engineering and design. Loops adopt diverse, but specific conformations stabilised by complex tertiary structural interactions that provide structural flexibility to RNA structures that would otherwise not be possible if they only consisted of the rigid A-helical shapes usually formed by canonical base pairing. By participating in sequence-non-local contacts, they furthermore contribute to stabilising the overall fold of RNA molecules. Interactions between RNAs and other nucleic acids, proteins, or small molecules are also generally mediated by RNA loop structures. Therefore, the function of an RNA molecule is generally dependent on its loops. Examples include intermolecular interactions between RNAs as part of the microRNA processing pathways, ribozymatic activity, or riboswitch-ligand interactions. Bioinformatics approaches have been successfully applied to the identification of novel RNA structural motifs including loops, local and global RNA 3D structure prediction, and structural and conformational analysis of RNAs and have contributed to a better understanding of the sequence-structure-function relationships in RNA loops.
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29
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Jayaraj GG, Nahar S, Maiti S. Nonconventional chemical inhibitors of microRNA: therapeutic scope. Chem Commun (Camb) 2015; 51:820-31. [DOI: 10.1039/c4cc04514a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
MicroRNAs (miRNAs) are a class of genomically encoded small RNA molecules (∼22nts in length), which regulate gene expression post transcriptionally. miRNAs are implicated in several diseases, thus modulation of miRNA is of prime importance. Small molecules offer a non-conventional alternative to do so.
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Affiliation(s)
- Gopal Gunanathan Jayaraj
- Chemical & Systems Biology Unit
- CSIR-Institute of Genomics and Integrative Biology
- New Delhi
- India 110020
- AcSIR – Academy of Scientific and Innovative Research
| | - Smita Nahar
- Chemical & Systems Biology Unit
- CSIR-Institute of Genomics and Integrative Biology
- New Delhi
- India 110020
- AcSIR – Academy of Scientific and Innovative Research
| | - Souvik Maiti
- Chemical & Systems Biology Unit
- CSIR-Institute of Genomics and Integrative Biology
- New Delhi
- India 110020
- CSIR-National Chemical Laboratory
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30
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Khan AY, Saha B, Kumar GS. Interaction of phenazinium dyes with double-stranded poly(A): spectroscopy and isothermal titration calorimetry studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 131:615-624. [PMID: 24861262 DOI: 10.1016/j.saa.2014.04.087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 03/19/2014] [Accepted: 04/14/2014] [Indexed: 06/03/2023]
Abstract
A comprehensive study on the binding of phenazinium dyes viz. janus green B, indoine blue, safranine O and phenosafranine with double stranded poly(A) using various spectroscopic and calorimetric techniques is presented. A higher binding of janus green B and indoine blue over safranine O and phenosafranine to poly(A) was observed from all experiments. Intercalative mode of binding of the dyes was inferred from fluorescence polarization anisotropy, iodide quenching and viscosity experiments. Circular dichroism study revealed significant perturbation of the secondary structure of poly(A) on binding of these dyes. Results from isothermal titration calorimetry experiments suggested that the binding was predominantly entropy driven with a minor contribution of enthalpy to the standard molar Gibbs energy. The results presented here may open new opportunities in the application of these dyes as RNA targeted therapeutic agents.
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Affiliation(s)
- Asma Yasmeen Khan
- Biophysical Chemistry Laboratory, Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata 700 032, India
| | - Baishakhi Saha
- Biophysical Chemistry Laboratory, Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata 700 032, India
| | - Gopinatha Suresh Kumar
- Biophysical Chemistry Laboratory, Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata 700 032, India.
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31
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Vasile F, Rossi D, Collina S, Potenza D. Diffusion-Ordered Spectroscopy and Saturation Transfer Difference NMR Spectroscopy Studies of Selective Interactions between ELAV Protein Fragments and an mRNA Target. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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32
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Hong W, Zeng J, Xie J. Antibiotic drugs targeting bacterial RNAs. Acta Pharm Sin B 2014; 4:258-65. [PMID: 26579393 PMCID: PMC4629089 DOI: 10.1016/j.apsb.2014.06.012] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 06/04/2014] [Accepted: 06/20/2014] [Indexed: 10/26/2022] Open
Abstract
RNAs have diverse structures that include bulges and internal loops able to form tertiary contacts or serve as ligand binding sites. The recent increase in structural and functional information related to RNAs has put them in the limelight as a drug target for small molecule therapy. In addition, the recognition of the marked difference between prokaryotic and eukaryotic rRNA has led to the development of antibiotics that specifically target bacterial rRNA, reduce protein translation and thereby inhibit bacterial growth. To facilitate the development of new antibiotics targeting RNA, we here review the literature concerning such antibiotics, mRNA, riboswitch and tRNA and the key methodologies used for their screening.
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Affiliation(s)
| | | | - Jianping Xie
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Ministry of Education Eco-Environment of the Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing 400715, China
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33
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Dudek M, Romanowska J, Wituła T, Trylska J. Interactions of amikacin with the RNA model of the ribosomal A-site: computational, spectroscopic and calorimetric studies. Biochimie 2014; 102:188-202. [PMID: 24769038 DOI: 10.1016/j.biochi.2014.03.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Accepted: 03/20/2014] [Indexed: 10/25/2022]
Abstract
Amikacin is a 2-deoxystreptamine aminoglycoside antibiotic possessing a unique l-HABA (l-(-)-γ-amino-α-hydroxybutyric acid) group and applied in the treatment of hospital-acquired infections. Amikacin influences bacterial translation by binding to the decoding region of the small ribosomal subunit that overlaps with the binding site of aminoacylated-tRNA (A-site). Here, we have characterized thermodynamics of interactions of amikacin with a 27-mer RNA oligonucleotide mimicking the aminoglycoside binding site in the bacterial ribosome. We applied isothermal titration and differential scanning calorimetries, circular dichroism and thermal denaturation experiments, as well as computer simulations. Thermal denaturation studies have shown that amikacin affects only slightly the melting temperatures of the A-site mimicking RNA model suggesting a moderate stabilization of RNA by amikacin. Isothermal titration calorimetry gives the equilibrium dissociation constants for the binding reaction between amikacin and the A-site oligonucleotide in the micromolar range with a favorable enthalpic contribution. However, for amikacin we observe a positive entropic contribution to binding, contrary to other aminoglycosides, paromomycin and ribostamycin. Circular dichroism spectra suggest that the observed increase in entropy is not caused by structural changes of RNA because amikacin binding does not destabilize the helicity of the RNA model. To investigate the origins of this positive entropy change we performed all-atom molecular dynamics simulations in explicit solvent for the 27-mer RNA oligonucleotide mimicking one A-site and the crystal structure of an RNA duplex containing two A-sites. We observed that the diversity of the conformational states of the l-HABA group sampled in the simulations of the complex was larger than for the free amikacin in explicit water. Therefore, the larger flexibility of the l-HABA group in the bound form may contribute to an increase of entropy upon binding.
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Affiliation(s)
- Marta Dudek
- Centre of New Technologies, University of Warsaw, Al. Żwirki i Wigury 93, 02-089 Warsaw, Poland; Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland; First Faculty of Medicine, Department of Hematology, Oncology and Internal Diseases, Medical University of Warsaw, Al. Żwirki i Wigury 61, 02-091 Warsaw, Poland
| | - Julia Romanowska
- Department of Biophysics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland; Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw, Pawińskiego 5a, 02-106 Warsaw, Poland
| | - Tomasz Wituła
- Centre of New Technologies, University of Warsaw, Al. Żwirki i Wigury 93, 02-089 Warsaw, Poland
| | - Joanna Trylska
- Centre of New Technologies, University of Warsaw, Al. Żwirki i Wigury 93, 02-089 Warsaw, Poland.
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Mehta A, Sonam S, Gouri I, Loharch S, Sharma DK, Parkesh R. SMMRNA: a database of small molecule modulators of RNA. Nucleic Acids Res 2014; 42:D132-41. [PMID: 24163098 PMCID: PMC3965028 DOI: 10.1093/nar/gkt976] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 09/13/2013] [Accepted: 10/01/2013] [Indexed: 02/05/2023] Open
Abstract
We have developed SMMRNA, an interactive database, available at http://www.smmrna.org, with special focus on small molecule ligands targeting RNA. Currently, SMMRNA consists of ∼770 unique ligands along with structural images of RNA molecules. Each ligand in the SMMRNA contains information such as Kd, Ki, IC50, ΔTm, molecular weight (MW), hydrogen donor and acceptor count, XlogP, number of rotatable bonds, number of aromatic rings and 2D and 3D structures. These parameters can be explored using text search, advanced search, substructure and similarity-based analysis tools that are embedded in SMMRNA. A structure editor is provided for 3D visualization of ligands. Advance analysis can be performed using substructure and OpenBabel-based chemical similarity fingerprints. Upload facility for both RNA and ligands is also provided. The physicochemical properties of the ligands were further examined using OpenBabel descriptors, hierarchical clustering, binning partition and multidimensional scaling. We have also generated a 3D conformation database of ligands to support the structure and ligand-based screening. SMMRNA provides comprehensive resource for further design, development and refinement of small molecule modulators for selective targeting of RNA molecules.
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Affiliation(s)
- Ankita Mehta
- Department of Advanced Protein Science, Institute of Microbial Technology, Chandigarh-160036, India
| | - Surabhi Sonam
- Department of Advanced Protein Science, Institute of Microbial Technology, Chandigarh-160036, India
| | - Isha Gouri
- Department of Advanced Protein Science, Institute of Microbial Technology, Chandigarh-160036, India
| | - Saurabh Loharch
- Department of Advanced Protein Science, Institute of Microbial Technology, Chandigarh-160036, India
| | - Deepak K. Sharma
- Department of Advanced Protein Science, Institute of Microbial Technology, Chandigarh-160036, India
| | - Raman Parkesh
- Department of Advanced Protein Science, Institute of Microbial Technology, Chandigarh-160036, India
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González-García J, Uzelac L, Kralj M, Llinares JM, García-España E, Piantanida I. The size of the aryl linker between two polyaza-cyclophane moieties controls the binding selectivity to ds-RNA vs. ds-DNA. Org Biomol Chem 2013; 11:2154-61. [PMID: 23392228 DOI: 10.1039/c3ob00032j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Aryl-linked (pyridine- vs. phenanthroline-) bis-polyaza pyridinophane scorpiands PYPOD and PHENPOD strongly bind to the double stranded DNA and RNA, whereby very intriguing RNA over DNA selectivity is finely tuned by aryl-linker length and aromatic surface. Moreover, PYPOD and PHENPOD dimer formation at high compound/polynucleotide ratios is highly sensitive to the fine interplay between the steric and binding properties of compound-dimers and the DNA minor groove/RNA major groove. That is demonstrated by significantly different induced CD spectra, which allow spectroscopic differentiation between various DNA/RNA secondary structures. A significantly higher (micromolar) antiproliferative effect of PYPOD and PHENPOD on human cell lines with respect to previously reported pyridine-based tripodal aliphatic polyamines is attributed to masked positive charges and increased hydrophobicity of novel compounds, resulting in more efficient membrane permeation and cellular uptake.
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Affiliation(s)
- Jorge González-García
- ICMOL, Departamento de Química Inorgánica, Facultad de Química, Universidad de Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Valencia, Spain
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36
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Lünse CE, Schüller A, Mayer G. The promise of riboswitches as potential antibacterial drug targets. Int J Med Microbiol 2013; 304:79-92. [PMID: 24140145 DOI: 10.1016/j.ijmm.2013.09.002] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Riboswitches represent promising novel RNA structures for developing compounds that artificially regulate gene expression and, thus, bacterial growth. The past years have seen increasing efforts to identify metabolite-analogues which act on riboswitches and which reveal antibacterial activity. Here, we summarize the current inventory of riboswitch-targeting compounds, their characteristics and antibacterial potential.
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Affiliation(s)
- Christina E Lünse
- Life & Medical Sciences Institute, University of Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany
| | - Anna Schüller
- Life & Medical Sciences Institute, University of Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany
| | - Günter Mayer
- Life & Medical Sciences Institute, University of Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany.
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Basu A, Jaisankar P, Suresh Kumar G. Binding of the 9-O-N-aryl/arylalkyl amino carbonyl methyl substituted berberine analogs to tRNA(phe.). PLoS One 2013; 8:e58279. [PMID: 23526972 PMCID: PMC3602459 DOI: 10.1371/journal.pone.0058279] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Accepted: 02/01/2013] [Indexed: 12/19/2022] Open
Abstract
Background Three new analogs of berberine with aryl/arylalkyl amino carbonyl methyl substituent at the 9-position of the isoquinoline chromophore along with berberrubine were studied for their binding to tRNAphe by wide variety of biophysical techniques like spectrophotometry, spectrofluorimetry, circular dichroism, thermal melting, viscosity and isothermal titration calorimetry. Methodology/Principal Findings Scatchard binding isotherms revealed that the cooperative binding mode of berberine was propagated in the analogs also. Thermal melting studies showed that all the 9-O-N-aryl/arylalkyl amino carbonyl methyl substituted berberine analogs stabilized the tRNAphe more in comparison to berberine. Circular dichroism studies showed that these analogs perturbed the structure of tRNAphe more in comparison to berberine. Ferrocyanide quenching studies and viscosity results proved the intercalative binding mode of these analogs into the helical organization of tRNAphe. The binding was entropy driven for the analogs in sharp contrast to the enthalpy driven binding of berberine. The introduction of the aryl/arylalkyl amino carbonyl methyl substituent at the 9-position thus switched the enthalpy driven binding of berberine to entropy dominated binding. Salt and temperature dependent calorimetric studies established the involvement of multiple weak noncovalent interactions in the binding process. Conclusions/Significance The results showed that 9-O-N-aryl/arylalkyl amino carbonyl methyl substituted berberine analogs exhibited almost ten folds higher binding affinity to tRNAphe compared to berberine whereas the binding of berberrubine was dramatically reduced by about twenty fold in comparison to berberine. The spacer length of the substitution at the 9-position of the isoquinoline chromophore appears to be critical in modulating the binding affinities towards tRNAphe.
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Affiliation(s)
- Anirban Basu
- Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata, India
- Biophysical Chemistry Laboratory, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | | | - Gopinatha Suresh Kumar
- Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata, India
- Biophysical Chemistry Laboratory, CSIR-Indian Institute of Chemical Biology, Kolkata, India
- * E-mail:
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38
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King J, Shammas C, Nareen M, Lelli M, Ramesh V. NMR characterisation of a highly conserved secondary structural RNA motif of Halobacterium halobium 23S rRNA. Org Biomol Chem 2013; 11:3382-92. [DOI: 10.1039/c3ob40295a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Nakatani K, Toda M, He H. A dimeric form of N-methoxycarbonyl-2-amino-1,8-naphthyridine bound to the A-A mismatch in the CAG/CAG base triad in dsRNA. Bioorg Med Chem Lett 2012; 23:558-61. [PMID: 23245513 DOI: 10.1016/j.bmcl.2012.11.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2012] [Accepted: 11/07/2012] [Indexed: 12/28/2022]
Abstract
A dimeric form of N-methoxycarbonyl-2-amino-1,8-naphthyridine (MCND) connected at the C2 position with a three-atom linker was examined for the binding to mismatches in double stranded RNA. Despite the fully complementary hydrogen bonding groups to guanine, MCND did not bind to guanine-guanine mismatch but did to adenine-adenine mismatch. The base pairs flanking the mismatch had weak effect on the binding, with showing the strongest binding to the A-A mismatch in the CAG/CAG sequence. The A-A mismatch in the GAC/GAC sequence was a poor substrate for the MCND binding. A monomeric derivative of MCND and another derivative lacking a methylcarbamate group showed negligilble binding to the A-A mismatch and the sequence selectivity. These results are important clues for the better molecular design of RNA binding small molecules.
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Affiliation(s)
- Kazuhiko Nakatani
- Regulatory Bioorganic Chemistry, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Japan.
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40
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Umemoto S, Im S, Zhang J, Hagihara M, Murata A, Harada Y, Fukuzumi T, Wazaki T, Sasaoka SI, Nakatani K. Structure-activity studies on the fluorescent indicator in a displacement assay for the screening of small molecules binding to RNA. Chemistry 2012; 18:9999-10008. [PMID: 22763984 DOI: 10.1002/chem.201103932] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 04/04/2012] [Indexed: 11/12/2022]
Abstract
A series of xanthone and thioxanthone derivatives with aminoalkoxy substituents were synthesized as fluorescent indicators for a displacement assay in the study of small-molecule-RNA interactions. The RNA-binding properties of these molecules were investigated in terms of the improved binding selectivity to the loop region in the RNA secondary structure relative to 2,7-bis(2-aminoethoxy)xanthone (X2S) by fluorimetric titration and displacement assay. An 11-mer double-stranded RNA and a hairpin RNA mimicking the stem loop IIB of Rev response element (RRE) RNA of HIV-1 mRNA were used. The X2S derivatives with longer aminoalkyl substituents showed a higher affinity to the double-stranded RNA than the parent molecule. Introduction of a methyl group on the aminoethoxy moiety of X2S effectively modulated the selectivity to the RNA secondary structure. Methyl group substitution at the C1' position suppressed the binding to the loop regions. Substitution with two methyl groups on the amino nitrogen atom resulted in reducing the affinity to the double-stranded region by a factor of 40%. The effect of methyl substitution on the amino nitrogen atom was also observed for a thioxanthone derivative. Titration experiments, however, suggested that thioxanthone derivatives showed a more prominent tendency of multiple binding to RNA than xanthone derivatives. The selectivity index calculated from the affinity to the double-stranded and loop regions suggested that the N,N-dimethyl derivative of X2S would be suitable for the screening of small molecules binding to RRE.
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Affiliation(s)
- Shiori Umemoto
- Department of Regulatory Bioorganic Chemistry, The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Japan
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41
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Do TN, Ippoliti E, Carloni P, Varani G, Parrinello M. Counterion Redistribution upon Binding of a Tat-Protein Mimic to HIV-1 TAR RNA. J Chem Theory Comput 2012; 8:688-94. [PMID: 26596616 DOI: 10.1021/ct2005769] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Binding of proteins and small molecules to RNA involves many electrostatic interactions, which may alter the distribution of ions around the RNA molecule. Here, we use molecular dynamics simulations to investigate how binding of a cyclic peptide mimic of the HIV-1 Tat protein affects the ionic distribution around the HIV-1 TAR RNA element. The calculations reproduce the structural properties observed in NMR studies of TAR and its complex. They also provide insight into the rearrangement of counterions during the molecular recognition events leading to the formation of the protein/RNA complex.
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Affiliation(s)
- Trang N Do
- SISSA/ISAS-International School for Advanced Studies, Trieste 34136, Italy.,Department of Physics, University of Science, Hochiminh City 70000, Vietnam
| | - Emiliano Ippoliti
- German Research School for Simulation Sciences GmbH, Jülich 52425, Germany
| | - Paolo Carloni
- German Research School for Simulation Sciences GmbH, Jülich 52425, Germany
| | - Gabriele Varani
- Department of Chemistry and Department of Biochemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Michele Parrinello
- Department of Chemistry and Applied Biosciences, ETH Zurich, Lugano 6900, Switzerland
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42
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Chen W, Zhang SW, Cheng YM, Pan Q. Identification of protein-RNA interaction sites using the information of spatial adjacent residues. Proteome Sci 2011; 9 Suppl 1:S16. [PMID: 22165911 PMCID: PMC3289077 DOI: 10.1186/1477-5956-9-s1-s16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Protein-RNA interactions play an important role in numbers of fundamental cellular processes such as RNA splicing, transport and translation, protein synthesis and certain RNA-mediated enzymatic processes. The more knowledge of Protein-RNA recognition can not only help to understand the regulatory mechanism, the site-directed mutagenesis and regulation of RNA-protein complexes in biological systems, but also have a vitally effecting for rational drug design. RESULTS Based on the information of spatial adjacent residues, novel feature extraction methods were proposed to predict protein-RNA interaction sites with SVM-KNN classifier. The total accuracies of spatial adjacent residue profile feature and spatial adjacent residues weighted accessibility solvent area feature are 78%, 67.07% respectively in 5-fold cross-validation test, which are 1.4%, 3.79% higher than that of sequence neighbour residue profile feature and sequence neighbour residue accessibility solvent area feature. CONCLUSIONS The results indicate that the performance of feature extraction method using the spatial adjacent information is superior to the sequence neighbour information approach. The performance of SVM-KNN classifier is little better than that of SVM. The feature extraction method of spatial adjacent information with SVM-KNN is very effective for identifying protein-RNA interaction sites and may at least play a complimentary role to the existing methods.
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Affiliation(s)
- Wei Chen
- College of Automation, Northwestern Polytechnical University, 710072, Xi'an, China.
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43
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Ma X, Guo J, Wu J, Liu H, Yu J, Xie J, Sun X. Prediction of RNA-binding residues in proteins from primary sequence using an enriched random forest model with a novel hybrid feature. Proteins 2011; 79:1230-9. [DOI: 10.1002/prot.22958] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2010] [Revised: 11/02/2010] [Accepted: 11/24/2010] [Indexed: 11/10/2022]
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44
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McCoy LS, Xie Y, Tor Y. Antibiotics that target protein synthesis. WILEY INTERDISCIPLINARY REVIEWS-RNA 2010; 2:209-32. [DOI: 10.1002/wrna.60] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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45
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Identification of RNA-binding sites in proteins by integrating various sequence information. Amino Acids 2010; 40:239-48. [DOI: 10.1007/s00726-010-0639-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Accepted: 05/22/2010] [Indexed: 12/12/2022]
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46
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Fulle S, Gohlke H. Molecular recognition of RNA: challenges for modelling interactions and plasticity. J Mol Recognit 2010; 23:220-31. [PMID: 19941322 DOI: 10.1002/jmr.1000] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
There is growing interest in molecular recognition processes of RNA because of RNA's widespread involvement in biological processes. Computational approaches are increasingly used for analysing and predicting binding to RNA, fuelled by encouraging progress in developing simulation, free energy and docking methods for nucleic acids. These developments take into account challenges regarding the energetics of RNA-ligand binding, RNA plasticity, and the presence of water molecules and ions in the binding interface. Accordingly, we will detail advances in force field and scoring function development for molecular dynamics (MD) simulations, free energy computations and docking calculations of nucleic acid complexes. Furthermore, we present methods that can detect moving parts within RNA structures based on graph-theoretical approaches or normal mode analysis (NMA). As an example of the successful use of these developments, we will discuss recent structure-based drug design approaches that focus on the bacterial ribosomal A-site RNA as a drug target.
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Affiliation(s)
- Simone Fulle
- Department of Biological Sciences, Molecular Bioinformatics Group, Goethe-University, Frankfurt, Germany
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47
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Sornosa-Ten A, Albelda MT, Frías JC, García-España E, Llinares JM, Budimir A, Piantanida I. Acid-base properties of functionalised tripodal polyamines and their interaction with nucleotides and nucleic acids. Org Biomol Chem 2010; 8:2567-74. [PMID: 20485792 DOI: 10.1039/c000124d] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel, highly positively charged tripodal polyamines with appended heterocyclic moieties revealed an intriguing panel of protonation species within the biologically relevant range. Studied compounds bind nucleotide monophosphates by mostly electrostatic interactions but only the imidazole analogue showed selectivity toward UMP in respect to other nucleotides. Strong binding of all the studied compounds to both ds-DNA and ds-RNA is to some extent selective toward the latter, showing rather rare RNA over DNA preference.
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Affiliation(s)
- Alejandra Sornosa-Ten
- Departament de Química Inorgànica, ICMol, Facultat de Química, Universitat de València, Burjassot, Spain
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48
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Zhang J, Umemoto S, Nakatani K. Fluorescent Indicator Displacement Assay for Ligand−RNA Interactions. J Am Chem Soc 2010; 132:3660-1. [DOI: 10.1021/ja100089u] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jinhua Zhang
- Department of Regulatory Bioorganic Chemistry, The Institute of Scientific and Industrial Research (ISIR), Osaka University, Ibaraki 567-0047, Japan
| | - Shiori Umemoto
- Department of Regulatory Bioorganic Chemistry, The Institute of Scientific and Industrial Research (ISIR), Osaka University, Ibaraki 567-0047, Japan
| | - Kazuhiko Nakatani
- Department of Regulatory Bioorganic Chemistry, The Institute of Scientific and Industrial Research (ISIR), Osaka University, Ibaraki 567-0047, Japan
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49
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Sherer EC. Antibiotics Targeting the Ribosome: Structure-Based Design and the Nobel Prize. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/s1574-1400(10)06009-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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50
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Selective deprotection of the Cbz amine protecting group for the facile synthesis of kanamycin A dimers linked at N-3″ position. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.06.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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