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Fujino T, Suzuki T, Okada K, Kogashi K, Yasumoto KI, Sogawa K, Isobe H. Chimeric RNA Oligonucleotides Incorporating Triazole-Linked Trinucleotides: Synthesis and Function as mRNA in Cell-Free Translation Reactions. J Org Chem 2016; 81:8967-8976. [PMID: 27579606 DOI: 10.1021/acs.joc.6b01618] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A method for the synthesis of chimeric oligonucleotides was developed to incorporate purine nucleobases and multiple triazole linkers in natural, phosphate-linked structures of RNA. A solution-phase synthesis method for triazole-linked RNA oligomers via copper-catalyzed azide-alkyne cycloaddition reaction was optimized and tolerated purine nucleobases and protecting groups for further transformations. Three TLRNA trinucleotides with 5'-protected hydroxy and 3'-phosphoramidite groups were prepared, and one congener with a representative sequence was subjected to automated, solid-phase phosphoramidite synthesis. The synthesis allowed the efficient preparation of 13-mer chimeric RNA oligonucleotides with two triazole linkers, ten phosphate linkers and purine/pyrimidine nucleobases. The chimeric oligonucleotide was found applicable to a cell-free translation system as mRNA and provided the genetic code for dipeptide production.
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Affiliation(s)
- Tomoko Fujino
- Department of Chemistry, Tohoku University , Aoba-ku, Sendai 980-8578, Japan
| | - Takeru Suzuki
- Department of Chemistry, Tohoku University , Aoba-ku, Sendai 980-8578, Japan
| | - Koudai Okada
- Department of Chemistry, Tohoku University , Aoba-ku, Sendai 980-8578, Japan
| | - Kanako Kogashi
- Department of Chemistry, Tohoku University , Aoba-ku, Sendai 980-8578, Japan
| | - Ken-Ichi Yasumoto
- Department of Biomolecular Sciences, Tohoku University , Aoba-ku, Sendai 980-8578, Japan
| | - Kazuhiro Sogawa
- Department of Biomolecular Sciences, Tohoku University , Aoba-ku, Sendai 980-8578, Japan
| | - Hiroyuki Isobe
- JST ERATO, Isobe Degenerate π-Integration Project and Advanced Institute for Materials Research, Tohoku University , Aoba-ku, Sendai 980-8577, Japan.,Department of Chemistry, The University of Tokyo , Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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2
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Mollica A, Feliciani F, Stefanucci A, Costante R, Lucente G, Pinnen F, Notaristefano D, Spisani S. Synthesis and biological evaluation of new active For-Met-Leu-Phe-OMe analogues containing para-substituted Phe residues. J Pept Sci 2012; 18:418-26. [DOI: 10.1002/psc.2414] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 02/28/2012] [Accepted: 03/14/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Adriano Mollica
- Dipartimento di Scienze del Farmaco; Università di Chieti-Pescara “G. d'Annunzio”; Via dei Vestini 31; 66100; Chieti; Italy
| | - Federica Feliciani
- Dipartimento di Scienze del Farmaco; Università di Chieti-Pescara “G. d'Annunzio”; Via dei Vestini 31; 66100; Chieti; Italy
| | - Azzurra Stefanucci
- Dipartimento di Scienze del Farmaco; Università di Chieti-Pescara “G. d'Annunzio”; Via dei Vestini 31; 66100; Chieti; Italy
| | - Roberto Costante
- Dipartimento di Scienze del Farmaco; Università di Chieti-Pescara “G. d'Annunzio”; Via dei Vestini 31; 66100; Chieti; Italy
| | - Gino Lucente
- Istituto di Chimica Biomolecolare (CNR) c/o Dipartimento di Chimica e Tecnologie del Farmaco, “Sapienza”; Università di Roma; P.le A.Moro; 00185; Roma; Italy
| | - Francesco Pinnen
- Dipartimento di Scienze del Farmaco; Università di Chieti-Pescara “G. d'Annunzio”; Via dei Vestini 31; 66100; Chieti; Italy
| | - Daniela Notaristefano
- Dipartimento di Biochimica e Biologia Molecolare; Università di Ferrara; Via L. Borsari 46; 44121; Ferrara; Italy
| | - Susanna Spisani
- Dipartimento di Biochimica e Biologia Molecolare; Università di Ferrara; Via L. Borsari 46; 44121; Ferrara; Italy
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Bruno O, Brullo C, Bondavalli F, Ranise A, Schenone S, Falzarano MS, Varani K, Spisani S. 2-Phenyl-2,3-dihydro-1H-imidazo[1,2-b]pyrazole derivatives: New potent inhibitors of fMLP-induced neutrophil chemotaxis. Bioorg Med Chem Lett 2007; 17:3696-701. [DOI: 10.1016/j.bmcl.2007.04.036] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2007] [Revised: 04/11/2007] [Accepted: 04/12/2007] [Indexed: 11/29/2022]
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4
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Spisani S, Fraulini A, Varani K, Falzarano S, Cavicchioni G. New chemotactic dimeric peptides show high affinity and potency at the human formylpeptide receptor. Eur J Pharmacol 2007; 567:171-6. [PMID: 17481605 DOI: 10.1016/j.ejphar.2007.04.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2006] [Revised: 03/26/2007] [Accepted: 04/03/2007] [Indexed: 10/23/2022]
Abstract
A number of analogues of the prototypical peptide for-Met-Leu-Phe-OMe (fMLP-OMe) have been studied in order to evaluate their ability to interact with formylpeptide receptors and to induce specific biological responses in human neutrophils. In vitro assays were carried out and receptor binding, chemotaxis, superoxide anion release and secretagogue activity were evaluated. The fMLP-OMe analogues synthesized, with the general formula for-Met-Leu-Phe-Xaa-Lys(OMe)-Phe-Leu-Met-for (Xaa=Gly, beta-Ala, gamma-aminobutyric acid, 5-aminovaleric acid, and 6-aminocaproic acid), were constituted by two fMLP units linked by a Lys residue, with an amino acid spacer between them. Competition binding experiments revealed that the new compounds have much more affinity for formylpeptide receptors than the reference ligand, with good correlation between receptor affinity and length of spacer. The EC(50) values for the killing mechanisms of each analogue were similar to each other, the affinity and potency, once again, being strictly dependent on the chain length. Furthermore the analogues proved to be more potent full agonists than the prototype fMLP-OMe in these functions, while chemotaxis was poorly induced. The dimeric fMLP-OMe analogues are one of the few examples of formylpeptides which exhibit a receptor affinity greater than the parent fMLP-OMe thereby rendering them suitable to be used as carriers for various drugs.
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Affiliation(s)
- Susanna Spisani
- Department of Biochemistry and Molecular Biology, University of Ferrara, 44100 Ferrara, Italy
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5
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Cavicchioni G, Fraulini A, Falzarano S, Spisani S. Structure–activity relationship of for-l-Met l-Leu-l-Phe-OMe analogues in human neutrophils. Bioorg Chem 2006; 34:298-318. [PMID: 16919307 DOI: 10.1016/j.bioorg.2006.07.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2006] [Revised: 06/29/2006] [Accepted: 07/07/2006] [Indexed: 11/22/2022]
Abstract
Neutrophils constitute the first line of defence against bacterial invasion. They migrate to infected tissues along a concentration gradient of chemoattractant molecules, the most important of which is for-Met-Leu-Phe-OH (fMLP). Different responses arise from formylpeptides binding to different isoforms of the specific receptor. The aim of the studies reported herein was to clarify (i) the role of fMLP-OMe amide bonds in receptor-ligand cross-linking, (ii) the nature of the group occupying the N- and C-terminal positions, (iii) the features peculiar to the Met, Leu, and Phe receptor pockets, and (iv) the features which determine the specific neutrophil response.
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Affiliation(s)
- Giorgio Cavicchioni
- Department of Pharmaceutical Sciences, University of Ferrara, 44100 Ferrara, Italy.
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6
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Selvatici R, Falzarano S, Mollica A, Spisani S. Signal transduction pathways triggered by selective formylpeptide analogues in human neutrophils. Eur J Pharmacol 2006; 534:1-11. [PMID: 16516193 DOI: 10.1016/j.ejphar.2006.01.034] [Citation(s) in RCA: 143] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2005] [Revised: 01/03/2006] [Accepted: 01/20/2006] [Indexed: 01/01/2023]
Abstract
Human neutrophils are highly specialised for their primary function, i.e. phagocytosis and destruction of microorganisms. Leukocyte recruitment to sites of inflammation and infection is dependent upon the presence of a gradient of locally produced chemotactic factors. The bacterial peptide N-formyl-methionyl-leucyl-phenylalanine (fMLP) was one of the first of these to be identified and is a highly potent leukocyte chemoattractant. It interacts with its receptor on the neutrophil membrane, activating these cells through a G-protein-coupled pathway. Two functional fMLP receptors have thus far been cloned and characterized, namely FPR (formyl peptide receptor) and FPRL1 (FPR like-1), with high and low affinities for fMLP, respectively. FMLP is known to activate phospholipase C (PLC), PLD, PLA2 and phosphatidylinositol-3-kinase (PI3K), and it also activates tyrosine phosphorylation. The second messengers resulting from the fMLP receptor interaction act on various intracellular kinases, including protein kinase C (PKC) and mitogen-activated protein kinases (MAPKs). The activation of these signal transduction pathways is known to be responsible for various biochemical responses which contribute to physiological defence against bacterial infection and cell disruption. This review will consider the ability of selective analogues (ligands able to discriminate between different biological responses) to activate a single spectrum of signal transduction pathways capable of producing a unique set of cellular responses, hypothesising that a distinctive imprint of signal protein activation may exist. Through more complete understanding of intracellular signaling, new drugs could be developed for the selective inflammatory blockade.
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Affiliation(s)
- Rita Selvatici
- Dipartimento di Medicina Sperimentale e Diagnostica, Sezione Genetica Medica, Via Fossato di Mortara 74, Università degli Studi di Ferrara, 44100 Ferrara, Italy
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7
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Cavicchioni G, Fraulini A, Turchetti M, Varani K, Falzarano S, Pavan B, Spisani S. Biological activity of for-Met-Leu-Phe-OMe analogs: Relevant substitutions specifically trigger killing mechanisms in human neutrophils. Eur J Pharmacol 2005; 512:1-8. [PMID: 15814083 DOI: 10.1016/j.ejphar.2005.02.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2005] [Revised: 02/08/2005] [Accepted: 02/10/2005] [Indexed: 10/25/2022]
Abstract
Two analogs of the prototypical peptide for-Met-Leu-Phe-OMe (fMLP-OMe), for-Gln-Tyr-Phe-OMe (1) and for-Gln-Tyr-Tyr-OMe (2), carrying unusual hydrophilic residues, were synthesized in order to investigate whether they provoked specific biological responses, as well as intracellular calcium mobilization, in human neutrophils. Whereas neither compound stimulates chemotaxis, both are able to elicit lysosomal enzyme production. However compound 1 is able to trigger copious superoxide anion production while compound 2 only elicits minor superoxide anion production. In binding experiments on formylpeptide receptors, the newly synthesized compounds for-Gln-Tyr-Phe-OMe (1) and for-Gln-Tyr-Tyr-OMe (2) showed affinity values in the micromolar range. These derivatives demonstrate inability to find a positive contribute from single substitutions. A very important result of this research is the evidence of the ability of the formyl group alone to trigger the primary target of the human neutrophil activity, i.e. killing mechanisms, by activating the specific receptor conformation.
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Affiliation(s)
- Giorgio Cavicchioni
- Department of Pharmaceutical Sciences, University of Ferrara, Via Fossato di Mortara 17/19, 44100 Ferrara, Italy.
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Rathore RS. Conformational investigations on analogs of inflammation response inducing chemotactic tripeptide fMLP. Biopolymers 2005; 80:651-64. [PMID: 15648091 DOI: 10.1002/bip.20231] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Conformations of three analogs of for-L-Met-L-Leu-L-Phe-OH (fMLP), which initiates inflammatory response by interaction with the formyl peptide receptor (FPR), have been investigated by the application of the X-ray crystallographic technique. The investigated analogs of fMLP peptides are as follows: for-L-Met-1-amino-1-cyclooctane-carbonyl(Ac8c)-L-Phe-OMe; for-L-Met-L-Leu-L-p-iodo-Phe-OH; and for-L-Met-di-n-propylglycyl(Dpg)-L-Phe-OMe. The peptide backbone in and is constrained at position of fMLP by the introduction of Calpha,alpha-disubstituted glycines. In peptide, Phe-OMe is substituted by p-iodo-Phe-OH. Crystal structures reveal an overall folded conformation adopted by and. The former is folded in the type II beta-turn, which is stabilized by an intramolecular 1<--4 (formyl) C==O...H--N (Phe) hydrogen bond, whereas the latter is folded in an open turn without any intramolecular hydrogen bond. On the other hand, peptide has an extended conformation, and two different molecules in a crystallographic asymmetric unit form an antiparallel beta-sheet-like structure. In and, residues Ac8c and Dpg adopt left-handed helical and fully extended (C5) conformations, respectively. The cyclooctane ring in Ac8c acquires a boat-chair conformation. Crystal packing of is characterized by the association of aliphatic-aromatic rings via a C--H...pi interaction. In the crystal of, contrary to the usual observations, peptides are interlinked via networks of head-to-tail hydrogen bond and pi...pi interactions, which are generally observed to be mutually exclusive. The structure-function mechanism of the ligand-receptor interaction is discussed.
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Abstract
Chemotaxis is an important cellular response common in biology. In many chemotaxing cells the signal that regulates movement is initiated by G protein-coupled receptors on the cell surface that bind specific chemoattractants. These receptors share important structural similarities with other G protein-coupled receptors, including rhodopsin, which currently serves as the best starting point for modeling their structures. However, the chemotaxis receptors also share a number of relatively unique structural features that are less common in other GPCRs. The chemoattractant ligands of chemotaxis receptors exhibit a broad variety of sizes and chemical properties, ranging from small molecules and peptides to protein ligands. As a result, different chemotaxis receptors have evolved specialized mechanisms for the early steps of ligand binding and receptor activation. The mechanism of transmembrane signaling is currently under intensive study and several alternate mechanisms proposing different conformational rearrangements of the transmembrane helices have been proposed. Some chemotaxis receptors are proposed to form dimers, and in certain cases dimer formation is proposed to play a role in transmembrane signaling. In principle the structural and dynamical changes that occur during transmembrane signaling could be specialized for different receptors, or could be broadly conserved. Extensive mutagenesis studies have been carried out, and have begun to identify critical residues involved in ligand binding, receptor activation, and transmembrane signaling.
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Affiliation(s)
- Aaron F Miller
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, USA
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