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of special interest. In this straightforward study, combinatorial chemistry was used to synthesize a number of aminoglycoside mimetics based on neamine, the central building block conserved among aminoglycoside antibiotics which are active against functional RNAs. The activity of the newly synthesized compounds was tested for their capacity to inhibit the binding of the HIV regulatory Rev protein to its target RNA.
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Park WKC, Auer M, Jaksche H, Wong CH. Rapid combinatorial synthesis of aminoglycoside antibiotic mimetics: use of a polyethylene glycol-linked amine and a neamine-derived aldehyde in multiple component condensation as a strategy for the discovery of new inhibitors of the HIV RNA Rev responsive element. of special interest J Am Chem Soc. 118:1996;10150-10155 In this straightforward study, combinatorial chemistry was used to synthesize a number of aminoglycoside mimetics based on neamine, the central building block conserved among aminoglycoside antibiotics which are active against functional RNAs. The activity of the newly synthesized compounds was tested for their capacity to inhibit the binding of the HIV regulatory Rev protein to its target RNA.
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Park, W.K.C.1
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of special interest. This study describes comprehensively the search for a Tat - TAR inhibitor by outlining several stages of the investigation, such as the drug synthesis by combinatorial chemistry, NMR-based molecular modelling studies on the drug - RNA complex and, finally, in vivo inhibition assays. Starting from pools of a partially randomized peptoid/peptide, consecutive rounds of binding selection were used to identify step by step the residues that result in a molecule which binds to TAR RNA and inhibits Tat binding in vitro at nanomolar concentrations.
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Hamy F, Felder ER, Heizmann G, Lazdins J, Aboul-Ela F, Varani G, Karn J, Klimkait T. An inhibitor of the Tat/TAR RNA interaction that effectively suppresses HIV-1 replication. of special interest Proc Natl Acad Sci USA. 94:1997;3548-3553 This study describes comprehensively the search for a Tat - TAR inhibitor by outlining several stages of the investigation, such as the drug synthesis by combinatorial chemistry, NMR-based molecular modelling studies on the drug - RNA complex and, finally, in vivo inhibition assays. Starting from pools of a partially randomized peptoid/peptide, consecutive rounds of binding selection were used to identify step by step the residues that result in a molecule which binds to TAR RNA and inhibits Tat binding in vitro at nanomolar concentrations.
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of special interest. This timely symposium-in-print contains 25 articles especially devoted to RNA recognition by low-molecular weight ligands giving a bird's eye view of the diverse activities in present day research.
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Hecht SM. Strategies for RNA recognition. of special interest Bioorg Med Chem. 5:1997;1001-1248 This timely symposium-in-print contains 25 articles especially devoted to RNA recognition by low-molecular weight ligands giving a bird's eye view of the diverse activities in present day research.
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of special interest. A thorough biochemical analysis using mutational and chemical probing techniques to study the interaction of aminoglycosides with RNA oligos which are minimal models of the decoding region of 16S rRNA. Sequence differences between prokaryotic and eukaryotic 16S rRNA are uncovered that are responsible for the higher sensitivity of prokaryotes against low antibiotic concentrations.
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Recht MI, Fourmy D, Blanchard SC, Dahlquist KD, Puglisi JD. RNA sequence determinants for aminoglycoside binding to an A-site rRNA model oligonucleotide. of special interest J Mol Biol. 262:1996;421-436 A thorough biochemical analysis using mutational and chemical probing techniques to study the interaction of aminoglycosides with RNA oligos which are minimal models of the decoding region of 16S rRNA. Sequence differences between prokaryotic and eukaryotic 16S rRNA are uncovered that are responsible for the higher sensitivity of prokaryotes against low antibiotic concentrations.
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Recht, M.I.1
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Miyaguchi H, Narita H, Sakamoto K, Yokoyama S. An antibiotic-binding motif of an RNA fragment derived from the A-site-related region of Escherichia coli 16S rRNA. Nucleic Acids Res. 24:1996;3700-3706.
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Wang, Y.1
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Rando, R.R.3
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Structure of the A site of Escherichia coli 16S ribosomal RNA complexed with an aminoglycoside antibiotic
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of oustanding interest. This paper describes the 3D solution structure, determined by NMR, of a complex between a model RNA derived from the A site of 16S rRNA and the aminoglycoside antibiotic paromomycin, the only complex between a non-aptamer RNA and a small effector molecule for which detailed structural information is available to date. The 3D model of the complex uncovers the structural basis for, firstly, the difference in sensitivity against low antibiotic concentrations between prokaryotic and eukaryotic 16S rRNA, and secondly, mechanisms of antibiotic resistance by site-specific methylation of the 16S rRNA in bacteria.
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Fourmy D, Recht MI, Blanchard SC, Puglisi JD. Structure of the A site of Escherichia coli 16S ribosomal RNA complexed with an aminoglycoside antibiotic. of oustanding interest Science. 274:1996;1367-1371 This paper describes the 3D solution structure, determined by NMR, of a complex between a model RNA derived from the A site of 16S rRNA and the aminoglycoside antibiotic paromomycin, the only complex between a non-aptamer RNA and a small effector molecule for which detailed structural information is available to date. The 3D model of the complex uncovers the structural basis for, firstly, the difference in sensitivity against low antibiotic concentrations between prokaryotic and eukaryotic 16S rRNA, and secondly, mechanisms of antibiotic resistance by site-specific methylation of the 16S rRNA in bacteria.
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Science
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Fourmy, D.1
Recht, M.I.2
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19
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0030973162
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Ribotoxic stress response: Activation of the stress-activated protein kinase JNK1 by inhibitors of the peptidyl transferase reaction and by sequence-specific RNA damage to the α-sarcin/ricin loop in the 28S rRNA
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of special interest. An original analysis of an unprecedented effect of the antibiotic anisomycin which induces the activation of a protein kinase by specific binding to eukaryotic 28S rRNA at concentrations where the protein biosynthesis is not impeded. The authors demonstrate that the kinase-activating signal induced by anisomycin-binding to the RNA component of active ribosomes is comparable to the effect of ribotoxic enzymes that chemically modify the 28S rRNA despite the fact that the binding site for the antibiotic is different from the recognition site of these enzymes.
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Iordanov MS, Pribnow D, Magun JL, Dinh TH, Pearson JA, Chen SLY, Magun BE. Ribotoxic stress response: activation of the stress-activated protein kinase JNK1 by inhibitors of the peptidyl transferase reaction and by sequence-specific RNA damage to the α-sarcin/ricin loop in the 28S rRNA. of special interest Mol Cell Biol. 17:1997;3373-3381 An original analysis of an unprecedented effect of the antibiotic anisomycin which induces the activation of a protein kinase by specific binding to eukaryotic 28S rRNA at concentrations where the protein biosynthesis is not impeded. The authors demonstrate that the kinase-activating signal induced by anisomycin-binding to the RNA component of active ribosomes is comparable to the effect of ribotoxic enzymes that chemically modify the 28S rRNA despite the fact that the binding site for the antibiotic is different from the recognition site of these enzymes.
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Iordanov, M.S.1
Pribnow, D.2
Magun, J.L.3
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Chen, S.L.Y.6
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Mei HY, Cui M, Lemrow SM, Czarnik AW. Discovery of selective, small-molecule inhibitors of RNA complexes. 2. Self-splicing group I intro ribozyme. of special interest Bioorg Med Chem. 5:1997;1185-1195 Structurally diverse compounds inhibiting self-splicing group I introns that could not have been rationally predicted were isolated by the authors using a novel high-throughput screening approach (see Mei et al. 1996 [24]).
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Electrostatic interactions in RNA-amino-glycosides binding
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of special interest. A first systematic analysis of the influence of substituents in aminoglycosides on inhibition of the hammerhead ribozyme. The authors demonstrate that the basicity of the amino substituents in the antibiotics, important for the interaction with the RNA, is modulated by neighboring hydroxyl groups. Both basicity and position of the amino substituents play a critical role in governing the eletrostatic interactions between aminoglycosides and RNA.
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Wang H, Tor Y. Electrostatic interactions in RNA-amino-glycosides binding. of special interest J Am Chem Soc. 119:1997;8734-8735 A first systematic analysis of the influence of substituents in aminoglycosides on inhibition of the hammerhead ribozyme. The authors demonstrate that the basicity of the amino substituents in the antibiotics, important for the interaction with the RNA, is modulated by neighboring hydroxyl groups. Both basicity and position of the amino substituents play a critical role in governing the eletrostatic interactions between aminoglycosides and RNA.
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of special interest. A theoretical approach combining molecular modelling and dynamics simulations that puts forward the idea that high-affinity binding of aminoglycosides to RNA folds is due to a structural electrostatic complementarity between positively charged ammonium groups in the antibiotics and metal binding sites in the RNA. In the paradigm system of the hammerhead RNA, solution conformations of aminoglycosides can replace magnesium ions by engaging into interactions with the RNA virtually identical to those made by the metals in the crystal structure
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Hermann T, Westhof E. Aminoglycoside binding to the hammerhead ribozyme: a general model for the interaction of cationic antibiotics with RNA. of special interest J Mol Biol. 1998; A theoretical approach combining molecular modelling and dynamics simulations that puts forward the idea that high-affinity binding of aminoglycosides to RNA folds is due to a structural electrostatic complementarity between positively charged ammonium groups in the antibiotics and metal binding sites in the RNA. In the paradigm system of the hammerhead RNA, solution conformations of aminoglycosides can replace magnesium ions by engaging into interactions with the RNA virtually identical to those made by the metals in the crystal structure.
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of special interest. By comparing in vitro-selected viomycin aptamers with naturally occurring RNAs that bind the cyclic peptide antibiotic viomycin the authors could show that viomycin, needs a complex 3D RNA fold for binding.
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of oustanding interest. The solution structure of an tobramycin aptamer RNA in complex with the drug, analysed by NMR spectroscopy, provides a first in-depth view of aminoglycoside-binding by RNA. Whereas at the resolution of this study it has not been possible to identify specific contacts between the aminoglycoside and the RNA, interesting features of RNA folding were uncovered showing how an almost channel-like pocket is created for the incorporation of a substrate molecule. Direct impact on the development of drugs comes from the fact that the studied tobramycin aptamer bears similarities to a conserved hexanucleotide loop in ribosomal RNA.
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