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Gomina A, Islam T, Shim G, Lei Z, Gates KS. Formation and Properties of DNA Adducts Generated by Reactions of Abasic Sites with 1,2-Aminothiols Including Cysteamine, Cysteine Methyl Ester, and Peptides Containing N-Terminal Cysteine Residues. Chem Res Toxicol 2024; 37:395-406. [PMID: 38181204 DOI: 10.1021/acs.chemrestox.3c00344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2024]
Abstract
The reaction of 1,2-aminothiol groups with aldehyde residues in aqueous solution generates thiazolidine products, and this process has been developed as a catalyst-free click reaction for bioconjugation. The work reported here characterized reactions of the biologically relevant 1,2-aminothiols including cysteamine, cysteine methyl ester, and peptides containing N-terminal cysteine residues with the aldehyde residue of apurinic/apyrimidinic (AP) sites in DNA oligomers. These 1,2-aminothiol-containing compounds rapidly generated adducts with AP sites in single-stranded and double-stranded DNA. NMR and MALDI-TOF-MS analyses provided evidence that the reaction generated a thiazolidine product. Conversion of an AP site to a thiazolidine-AP adduct protected against the rapid cleavage normally induced at AP sites by the endonuclease action of the enzyme APE1 and the AP-lyase activity of the biogenic amine spermine. In the presence of excess 1,2-aminothiols, the thiazolidine-AP adducts underwent slow strand cleavage via a β-lyase reaction that generated products with 1,2-aminothiol-modified sugar residues on the 3'-end of the strand break. In the absence of excess 1,2-aminothiols, the thiazolidine-AP adducts dissociated to release the parent AP-containing oligonucleotide. The properties of the thiazolidine-AP adducts described here mirror critical properties of SRAP proteins HMCES and YedK that capture AP sites in single-stranded regions of cellular DNA and protect them from cleavage.
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Affiliation(s)
- Anuoluwapo Gomina
- Department of Chemistry, University of Missouri, 125 Chemistry Building, Columbia, Missouri 65211, United States
| | - Tanhaul Islam
- Department of Chemistry, University of Missouri, 125 Chemistry Building, Columbia, Missouri 65211, United States
| | - Garam Shim
- Department of Chemistry, University of Missouri, 125 Chemistry Building, Columbia, Missouri 65211, United States
| | - Zhentian Lei
- MU Metabolomics Center, University of Missouri, 240F Christopher S. Bond Life Science Center, Columbia, Missouri 65211, United States
| | - Kent S Gates
- Department of Chemistry, University of Missouri, 125 Chemistry Building, Columbia, Missouri 65211, United States
- Department of Biochemistry, University of Missouri, 125 Chemistry Building, Columbia, Missouri 65211, United States
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2
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Jha JS, Nel C, Haldar T, Peters D, Housh K, Gates KS. Products Generated by Amine-Catalyzed Strand Cleavage at Apurinic/Apyrimidinic Sites in DNA: New Insights from a Biomimetic Nucleoside Model System. Chem Res Toxicol 2022; 35:203-217. [PMID: 35124963 PMCID: PMC9477562 DOI: 10.1021/acs.chemrestox.1c00408] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Abasic sites are common in cellular and synthetic DNA. As a result, it is important to characterize the chemical fate of these lesions. Amine-catalyzed strand cleavage at abasic sites in DNA is an important process in which conversion of small amounts of the ring-opened abasic aldehyde residue to an iminium ion facilitates β-elimination of the 3'-phosphoryl group. This reaction generates a trans-α,β-unsaturated iminium ion on the 3'-terminus of the strand break as an obligate intermediate. The canonical product expected from amine-catalyzed cleavage at an AP site is the corresponding trans-α,β-unsaturated aldehyde sugar remnant resulting from hydrolysis of this iminium ion. Interestingly, a handful of studies have reported noncanonical 3'-sugar remnants generated by amine-catalyzed strand cleavage, but the formation and properties of these products are not well-understood. To address this knowledge gap, a nucleoside system was developed that enabled chemical characterization of the sugar remnants generated by amine-catalyzed β-elimination in the 2-deoxyribose system. The results predict that amine-catalyzed strand cleavage at an AP site under physiological conditions has the potential to reversibly generate noncanonical cleavage products including cis-alkenal, 3-thio-2,3-dideoxyribose, and 2-deoxyribose groups alongside the canonical trans-alkenal residue on the 3'-terminus of the strand break. Thus, the model reactions provide evidence that the products generated by amine-catalyzed strand cleavage at abasic sites in cellular DNA may be more complex that commonly thought, with trans-α,β-unsaturated iminium ion intermediates residing at the hub of interconverting product mixtures. The results expand the list of possible 3'-sugar remnants arising from amine-catalyzed cleavage of abasic sites in DNA that must be chemically or enzymatically removed for the completion of base excision repair and single-strand break repair in cells.
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Affiliation(s)
- Jay S. Jha
- University of Missouri, Department of Chemistry, 125 Chemistry Building, Columbia, MO 65211
| | - Christopher Nel
- University of Missouri, Department of Chemistry, 125 Chemistry Building, Columbia, MO 65211
| | - Tuhin Haldar
- University of Missouri, Department of Chemistry, 125 Chemistry Building, Columbia, MO 65211
| | - Daniel Peters
- University of Missouri, Department of Chemistry, 125 Chemistry Building, Columbia, MO 65211
| | - Kurt Housh
- University of Missouri, Department of Chemistry, 125 Chemistry Building, Columbia, MO 65211
| | - Kent S. Gates
- University of Missouri, Department of Chemistry, 125 Chemistry Building, Columbia, MO 65211,University of Missouri, Department of Biochemistry, Columbia, MO 65211,Corresponding Author: Kent S. Gates – Departments of Chemistry and Biochemistry, 125 Chemistry Bldg. University of Missouri, Columbia, MO 65211, United States; Phone: (573) 882-6763;
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3
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Housh K, Gates KS. Synthesis of DNA Duplexes Containing Site-Specific Interstrand Cross-Links via Sequential Reductive Amination Reactions Involving Diamine Linkers and Abasic Sites on Complementary Oligodeoxynucleotides. Chem Res Toxicol 2021; 34:2384-2391. [PMID: 34694787 PMCID: PMC8650211 DOI: 10.1021/acs.chemrestox.1c00293] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Interstrand DNA cross-links are important in biology, medicinal chemistry, and materials science. Accordingly, methods for the targeted installation of interstrand cross-links in DNA duplexes may be useful in diverse fields. Here, a simple procedure is reported for the preparation of DNA duplexes containing site-specific, chemically defined interstrand cross-links. The approach involves sequential reductive amination reactions between diamine linkers and two abasic (apurinic/apyrimidinic, AP) sites on complementary oligodeoxynucleotides. Use of the symmetrical triamine, tris(2-aminoethyl)amine, in this reaction sequence enabled the preparation of a cross-linked DNA duplex bearing a derivatizable aminoethyl group.
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Affiliation(s)
- Kurt Housh
- University of Missouri, Department of Chemistry, 125 Chemistry Building, Columbia, MO 65211, United States
| | - Kent S. Gates
- University of Missouri, Department of Chemistry, 125 Chemistry Building, Columbia, MO 65211, United States
- University of Missouri, Department of Biochemistry, 125 Chemistry Building, Columbia, MO 65211, United States
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Barbado C, Córdoba-Cañero D, Ariza RR, Roldán-Arjona T. Nonenzymatic release of N7-methylguanine channels repair of abasic sites into an AP endonuclease-independent pathway in Arabidopsis. Proc Natl Acad Sci U S A 2018; 115:E916-E924. [PMID: 29339505 PMCID: PMC5798382 DOI: 10.1073/pnas.1719497115] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Abasic (apurinic/apyrimidinic, AP) sites in DNA arise from spontaneous base loss or by enzymatic removal during base excision repair. It is commonly accepted that both classes of AP site have analogous biochemical properties and are equivalent substrates for AP endonucleases and AP lyases, although the relative roles of these two types of enzymes are not well understood. We provide here genetic and biochemical evidence that, in Arabidopsis, AP sites generated by spontaneous loss of N7-methylguanine (N7-meG) are exclusively repaired through an AP endonuclease-independent pathway initiated by FPG, a bifunctional DNA glycosylase with AP lyase activity. Abasic site incision catalyzed by FPG generates a single-nucleotide gap with a 3'-phosphate terminus that is processed by the DNA 3'-phosphatase ZDP before repair is completed. We further show that the major AP endonuclease in Arabidopsis (ARP) incises AP sites generated by enzymatic N7-meG excision but, unexpectedly, not those resulting from spontaneous N7-meG loss. These findings, which reveal previously undetected differences between products of enzymatic and nonenzymatic base release, may shed light on the evolution and biological roles of AP endonucleases and AP lyases.
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Affiliation(s)
- Casimiro Barbado
- Maimónides Biomedical Research Institute of Córdoba, 14004 Córdoba, Spain
- Department of Genetics, University of Córdoba, 14071 Córdoba, Spain
- Reina Sofia University Hospital, 14004 Córdoba, Spain
| | - Dolores Córdoba-Cañero
- Maimónides Biomedical Research Institute of Córdoba, 14004 Córdoba, Spain
- Department of Genetics, University of Córdoba, 14071 Córdoba, Spain
- Reina Sofia University Hospital, 14004 Córdoba, Spain
| | - Rafael R Ariza
- Maimónides Biomedical Research Institute of Córdoba, 14004 Córdoba, Spain;
- Department of Genetics, University of Córdoba, 14071 Córdoba, Spain
- Reina Sofia University Hospital, 14004 Córdoba, Spain
| | - Teresa Roldán-Arjona
- Maimónides Biomedical Research Institute of Córdoba, 14004 Córdoba, Spain;
- Department of Genetics, University of Córdoba, 14071 Córdoba, Spain
- Reina Sofia University Hospital, 14004 Córdoba, Spain
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5
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Okamoto A, Tainaka K, Saito I. A facile incorporation of the aldehyde function into DNA: 3-formylindole nucleoside as an aldehyde-containing universal nucleoside. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00888-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Grimm GN, Boutorine AS, Hélène C. Rapid routes of synthesis of oligonucleotide conjugates from non-protected oligonucleotides and ligands possessing different nucleophilic or electrophilic functional groups. NUCLEOSIDES, NUCLEOTIDES & NUCLEIC ACIDS 2000; 19:1943-65. [PMID: 11200283 DOI: 10.1080/15257770008045470] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Optimized methods are described for post-synthetic conjugation of non-protected oligodeoxyribonucleotides to different ligands. Methods for the terminal functionalization of oligonucleotides by amino, sulfhydryl, thiophosphate or carboxyl groups using different chemical reactions and linkers in both organic and aqueous media are described and compared. Experimental conditions for subsequent coupling of ligands containing aliphatic and aromatic amines, aromatic alcohols, carboxylic, sulfhydryl, alkylating, aldehydic and other reactive nucleophilic and electrophilic groups to oligonucleotides were established, including covalent linkage to other oligonucleotides.
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Affiliation(s)
- G N Grimm
- Laboratoire de Biophysique, INSERM U201, CNRS UMR 8646, Muséum National d'Histoire Naturelle, Paris, France
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7
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Abstract
Loss of a base in DNA, i.e., creation of an abasic site leaving a deoxyribose residue in the strand, is a frequent lesion that may occur spontaneously, or under the action of radiations and alkylating agents, or enzymatically as an intermediate in the repair of modified or abnormal bases. The abasic site lesion is mutagenic or lethal if not repaired. From a chemical point of view,the abasic site is an alkali-labile residue that leads to strand breakage through beta- and delta- elimination. Progress in the understanding of the chemistry and enzymology of abasic DNA largely relies upon the study of synthetic abasic duplexes. Several efficient synthetic methods have thus been developed to introduce the lesion (or a stable analogue) at defined position in the sequence. Physicochemical and spectroscopic examination of such duplexes, including calorimetry, melting temperature, high-field nmr and molecular modeling indicate that the lesion strongly destabilizes the duplex, although remaining in the canonical B-form with structural modifications strictly located at the site of the lesion. Probes have been developed to titrate the damage in DNA in vitro. Series of molecules have been devised to recognize specifically the abasic site, exhibiting a cleavage activity and mimicking the AP nucleases. Others have been prepared that bind strongly to the abasic site and show promise in potentiating the cytotoxic and antitumor activity of the clinically used nitrosourea (bis-chloroethylnitrosurea).
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Affiliation(s)
- J Lhomme
- LEDSS, Chimie Bioorganique, UMR CNRS 5616, Université Joseph Fourier, Grenoble Cedex 9, France.
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Trévisiol E, Renard A, Defrancq E, Lhomme J. Fluorescent labelling of oligodeoxyribonucleotides by the oxyamino-aldehyde coupling reaction. NUCLEOSIDES, NUCLEOTIDES & NUCLEIC ACIDS 2000; 19:1427-39. [PMID: 11092313 DOI: 10.1080/15257770008033852] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
We describe the reaction of oligonucleotides containing an aldehydic group at the 5'-end or inside the sequence with an oxyamino label. The reaction was found to be highly selective and represents an efficient method for derivatization of oligonucleotides.
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Affiliation(s)
- E Trévisiol
- Chimie BioOrganique, LEDSS, UMR 5616, Université Joseph Fourier, Grenoble, France
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9
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Trévisiol E, Defrancq E, Lhomme J, Laayoun A, Cros P. Synthesis of Methylketone Containing Nucleoside Triphosphates for RNA Labelling. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00577-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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10
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Jourdan M, Garcia J, Lhomme J, Teulade-Fichou MP, Vigneron JP, Lehn JM. Threading bis-intercalation of a macrocyclic bisacridine at abasic sites in DNA: nuclear magnetic resonance and molecular modeling study. Biochemistry 1999; 38:14205-13. [PMID: 10571994 DOI: 10.1021/bi991111h] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The macrocyclic bisacridine (CBA) has been reported previously to specifically recognize single-stranded nucleic acid structures, especially DNA hairpins. The binding of the drug with an abasic site-containing oligonucleotide, was investigated by (1)H NMR and molecular modeling. We have used a DNA undecamer, the d(C(1)G(2)C(3)A(4)C(5)X(6)C(7)A(8)C(9)G(10)C(11)) x d(G(12)C(13)G(14)T(15)G(16)T(17)G(18)T(19)G(2)(0)C(21)G(22)) duplex in which the X residue is a stable analogue of the abasic site [3-hydroxy-2-(hydroxymethyl) tetrahydrofuran]. Analysis of the NMR data reveals that the bisacridine molecule forms two different intercalation complexes in a 80/20 (+/- 10) ratio. For the major complex, a molecular modeling study was performed guided by nineteen intermolecular drug-DNA restraints, determined from NOESY spectra. In this model, the ligand interacts in the threading binding mode with an acridine ring intercalated between the C(7)-A(8) and T(15)-G(16) base pairs, while the other acridine ring resides in the abasic pocket. The two linker chains are positioned in the minor and in the major groove, respectively. A comparable study was performed to evaluate the interaction of CBA with the parent unmodified duplex in which X(6) was replaced by an adenine residue. No complex formation was observed when operating in identical conditions. This shows the selective binding of CBA to the abasic site and its potential interest to target the abasic site lesion.
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Affiliation(s)
- M Jourdan
- Laboratoire de Chimie des Interactions Moléculaires, UPR 285, Collège de France, Paris, France
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11
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Trévisiol E, Renard A, Defrancq E, Lhomme J. The oxyamino-aldehyde coupling reaction: An efficient method for the derivatization of oligonucleotides. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)10335-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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12
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Berthet N, Constant JF, Demeunynck M, Michon P, Lhomme J. Search for DNA repair inhibitors: selective binding of nucleic bases-acridine conjugates to a DNA duplex containing an abasic site. J Med Chem 1997; 40:3346-52. [PMID: 9341909 DOI: 10.1021/jm970225t] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The abasic site is one of the most frequent DNA lesions generated by spontaneous or enzymatic cleavage of the N-glycosidic bond. The abasic site is also an intermediate in the nucleotide and base excision DNA repair. We examined molecules which recognize and cleave DNA at the abasic site with high efficiency. These molecules incorporate in their structure a nucleic base for abasic site recognition, an intercalator for DNA binding, and a polyamino linker for ionic interaction and DNA cleavage. Such compounds, by interfering with abasic sites in DNA, are also inhibitors of DNA repair. In order to better understand the parameters of the interaction, we carried out a UV thermal denaturation study of synthetic oligonucleotides containing the lesion both in the absence and in the presence of the drugs. A similar study was also carried out using the corresponding nonmodified oligonucleotide. The results indicate selective binding of the base-chain-intercalator conjugates to the abasic site containing oligonucleotides.
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Affiliation(s)
- N Berthet
- L.E.D.S.S., Chimie Bioorganique, UMR CNRS 5616, Université Joseph Fourier, Grenoble, France
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13
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Boturyn D, Defrancq E, Ducros VO, Fontaine C, Lhomme J. Quantitative One Step Derivatization of Oligonucleotides by a Fluorescent Label Through Abasic Site Formation. ACTA ACUST UNITED AC 1997. [DOI: 10.1080/07328319708002556] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Manoharan M, Andrade LK, Mohan V, Freier SM, Cook PD. Oligonucleotide Conjugates Derived from an Electrophilic Site: Conjugation to Baseless Carbohydrate Residue. Synthesis, Hybridization and Modeling Studies. ACTA ACUST UNITED AC 1997. [DOI: 10.1080/07328319708006267] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Silver GC, Nguyen CH, Boutorine AS, Bisagni E, Garestier T, Hélène C. Conjugates of oligonucleotides with triplex-specific intercalating agents. Stabilization of triple-helical DNA in the promoter region of the gene for the alpha-subunit of interleukin 2 (IL-2R alpha). Bioconjug Chem 1997; 8:15-22. [PMID: 9026030 DOI: 10.1021/bc9600675] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The stabilization of triple-helical DNA under physiological conditions is an important goal for the control of gene expression using the antigen strategy, an approach whereby an oligonucleotide binds to the major groove of double-helical DNA to fom a triple helix. To this end, triplex-specific intercalators, namely benzopyridoindole (BPI) and benzopyridoquinoxaline (BPQ) derivatives, have been conjugated to the 5' end or to an internucleotide position of a 15-mer oligonucleotide. These conjugates were then tested, using thermal denaturation experiments, for their ability to form and stabilize a triple-helical structure involving a 42-mer duplex target. All of the conjugates were found to do so. The B[h]PQ derivatives stabilized particularly well when attached to the 5' end with a delta Tm of 15 degrees C and -delta delta G degrees 37 of 3.4 kcal mol-1 (pH 6.9, 140 mM KCI, 15 mM sodium cacodylate, 2 mM MgCl2, 0.8 mM spermine). Though most of the derivatives when attached to the internucleotide position were not able to stabilize triple-helical DNA as well as when attached to the 5' end, one B[f]PQ derivative with an internucleotide attachment did so, with a delta Tm of 13 degrees C and -delta delta G degrees 37 of 2.8 kcal mol-1. To a lesser degree, these conjugates were also able to stabilize duplex structures with single-stranded targets. Results were compared to the stabilization obtained with acridine conjugates as well as to a similar study performed with a different sequence.
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Affiliation(s)
- G C Silver
- Laboratoire de Biophysique, Muséum National d'Histoire Naturelle, INSERM U201-CNRS URA 481, Paris, France
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Perigaud C, Aubertin AM, Benzaria S, Pelicano H, Girardet JL, Maury G, Gosselin G, Kirn A, Imbach JL. Equal inhibition of the replication of human immunodeficiency virus in human T-cell culture by ddA bis(SATE)phosphotriester and 3'-azido-2',3'-dideoxythymidine. Biochem Pharmacol 1994; 48:11-14. [PMID: 8043011 DOI: 10.1016/0006-2952(94)90217-8] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
It is shown that ddA bis(SATE)phosphotriester is one of the most potent anti-HIV agents in cell culture. Compared with the parent nucleoside, ddA, an increase of 3 orders of magnitude was observed in the EC50, which makes this compound as active as AZT. This can be tentatively explained if one considers that direct ddAMP intracellular delivery shunts the well established ddA/ddI metabolism pathway.
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Affiliation(s)
- C Perigaud
- Laboratoire de Chimie Bio-Organique, U.R.A. 488 du C.N.R.S., Université de Montpellier II, France
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17
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Beaucage SL, Iyer RP. The synthesis of modified oligonucleotides by the phosphoramidite approach and their applications. Tetrahedron 1993. [DOI: 10.1016/s0040-4020(01)87958-8] [Citation(s) in RCA: 277] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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18
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An indexed bibliography of antisense literature, 1991. ANTISENSE RESEARCH AND DEVELOPMENT 1992; 2:63-107. [PMID: 1422087 DOI: 10.1089/ard.1992.2.63] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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19
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Porumb H, Bertrand JR, Paoletti J, Vasseur JJ, Rayner B, Imbach JL, Malvy C. 9-Aminoellipticine-derivatized alpha- and beta-oligodeoxyribonucleotides targeted to the cap of beta-globin mRNA: hybridization to natural and engineered mRNA, inhibition of translation, and improved effect of tandem chains. ANTISENSE RESEARCH AND DEVELOPMENT 1992; 2:279-92. [PMID: 1292777 DOI: 10.1089/ard.1992.2.279] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We studied the duplex stability and the antimessenger activity of 9-aminoellipticine-5'-functionalized alpha- and beta-anomeric DNA sequences complementary to the first 14 nucleotides of the rabbit beta-globin mRNA. The duplex formed by the beta-conjugate with the natural mRNA target possessed a marginally better stability to that of the duplex formed by the unfunctionalized compound, as measured by the thermal elution. The alpha-conjugate did not anneal to native mRNA, possibly due to the interference of the 9-aminoellipticine with the cap structure and, unlike the beta-adduct, was practically inactive as inhibitor of translation in a cell-free system. However, it did hybridize to an RNA construction containing the beta-globin mRNA plus an additional 50 bases in 5'. Surprisingly, translation from this construction was inhibited by the alpha-species in spite of the nonvicinity of the target to the cap. Both alpha and beta conjugates hybridized to a DNA 14-mer of the same sequence as that targeted onto the mRNA. Thermal denaturation and fluorescence spectroscopy showed that the drug brought no considerable stabilization to the duplex, the linker presumably being unfavorable to intercalation. An increased stability of the complex and a higher inhibitory effect on cell-free beta-globin translation were obtained with two contiguous beta-oligomers of which one was functionalized.
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Affiliation(s)
- H Porumb
- Laboratoire de Biochimie-Enzymologie et de Physicochimie Macromoléculaire, CNRS URA 147, Institut Gustave Roussy, Villejuif, France
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