Hoechst 33258 Tethered by a Hexa(ethylene glycol) Linker to the 5'-Termini of Oligodeoxynucleotide 15-Mers: Duplex Stabilization and Fluorescence Properties.
Identifieur interne : 003C22 ( Main/Exploration ); précédent : 003C21; suivant : 003C23Hoechst 33258 Tethered by a Hexa(ethylene glycol) Linker to the 5'-Termini of Oligodeoxynucleotide 15-Mers: Duplex Stabilization and Fluorescence Properties.
Auteurs : Sharanabasava B. Rajur [États-Unis] ; Jordi Robles ; Kristin Wiederholt ; Robert G. Kuimelis ; Larry W. MclaughlinSource :
- The Journal of organic chemistry [ 1520-6904 ] ; 1997.
Abstract
A fluorescent Hoechst 33258 derivative has been prepared in which a hexa(ethylene glycol) linker is attached to the terminal phenol residue. Conjugation of this derivative to DNA sequences is accomplished by a reversed coupling protocol, one in which the 5'-terminal nucleoside residue of a fully protected DNA sequence is converted to a terminal phosphoramidite. In the presence of the Hoechst derivative and tetrazole the final coupling reaction is achieved to generate the conjugated nucleic acid. After deprotection and cleavage of the conjugate from the support, HPLC analysis indicates that the conjugation reaction proceeds with yields as high as 75%. The presence of the conjugated Hoechst derivative increases the stability of DNA duplexes typically by 10-16 degrees C. A variety of sequence variants indicate that the tether length is sufficient to reach beyond the terminus of the DNA duplex and bind to internal A-T rich target sequences as far away as four base pairs from the site of attachment. A four base pair binding site appears to be necessary for effective helix stabilization by the conjugate, but in some cases can include a G-C base pair, which is consistent with a previous X-ray diffraction study regarding the binding of Hoechst 33258 to duplex DNA. When A-T base pairs alternate with G-C base pairs, a small but discernible increase is T(m) is observed (3.6 degrees C), indicating that binding to this sequence still occurs, but not in the same manner as to A-T rich sequences. Upon formation of the conjugated duplex, an enhanced quantum yield for the fluorescence emission spectrum of the tethered Hoechst derivative is observed. When an A-T rich binding site is present, the enhanced quantum yield increases by at least 16- and in some cases to nearly 30-fold relative to the value obtained for the single-stranded DNA-Hoechst conjugate.
DOI: 10.1021/jo9618536
PubMed: 11671444
Affiliations:
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Rajur</name><affiliation wicri:level="2"><nlm:affiliation>Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02167.</nlm:affiliation><country xml:lang="fr">États-Unis</country><placeName><region type="state">Massachusetts</region></placeName><wicri:cityArea>Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill</wicri:cityArea></affiliation></author><author><name sortKey="Robles, Jordi" sort="Robles, Jordi" uniqKey="Robles J" first="Jordi" last="Robles">Jordi Robles</name></author><author><name sortKey="Wiederholt, Kristin" sort="Wiederholt, Kristin" uniqKey="Wiederholt K" first="Kristin" last="Wiederholt">Kristin Wiederholt</name></author><author><name sortKey="Kuimelis, Robert G" sort="Kuimelis, Robert G" uniqKey="Kuimelis R" first="Robert G." last="Kuimelis">Robert G. Kuimelis</name></author><author><name sortKey="Mclaughlin, Larry W" sort="Mclaughlin, Larry W" uniqKey="Mclaughlin L" first="Larry W." last="Mclaughlin">Larry W. Mclaughlin</name></author></analytic><series><title level="j">The Journal of organic chemistry</title><idno type="eISSN">1520-6904</idno><imprint><date when="1997" type="published">1997</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A fluorescent Hoechst 33258 derivative has been prepared in which a hexa(ethylene glycol) linker is attached to the terminal phenol residue. Conjugation of this derivative to DNA sequences is accomplished by a reversed coupling protocol, one in which the 5'-terminal nucleoside residue of a fully protected DNA sequence is converted to a terminal phosphoramidite. In the presence of the Hoechst derivative and tetrazole the final coupling reaction is achieved to generate the conjugated nucleic acid. After deprotection and cleavage of the conjugate from the support, HPLC analysis indicates that the conjugation reaction proceeds with yields as high as 75%. The presence of the conjugated Hoechst derivative increases the stability of DNA duplexes typically by 10-16 degrees C. A variety of sequence variants indicate that the tether length is sufficient to reach beyond the terminus of the DNA duplex and bind to internal A-T rich target sequences as far away as four base pairs from the site of attachment. A four base pair binding site appears to be necessary for effective helix stabilization by the conjugate, but in some cases can include a G-C base pair, which is consistent with a previous X-ray diffraction study regarding the binding of Hoechst 33258 to duplex DNA. When A-T base pairs alternate with G-C base pairs, a small but discernible increase is T(m) is observed (3.6 degrees C), indicating that binding to this sequence still occurs, but not in the same manner as to A-T rich sequences. Upon formation of the conjugated duplex, an enhanced quantum yield for the fluorescence emission spectrum of the tethered Hoechst derivative is observed. When an A-T rich binding site is present, the enhanced quantum yield increases by at least 16- and in some cases to nearly 30-fold relative to the value obtained for the single-stranded DNA-Hoechst conjugate.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Massachusetts</li></region></list><tree><noCountry><name sortKey="Kuimelis, Robert G" sort="Kuimelis, Robert G" uniqKey="Kuimelis R" first="Robert G." last="Kuimelis">Robert G. Kuimelis</name><name sortKey="Mclaughlin, Larry W" sort="Mclaughlin, Larry W" uniqKey="Mclaughlin L" first="Larry W." last="Mclaughlin">Larry W. Mclaughlin</name><name sortKey="Robles, Jordi" sort="Robles, Jordi" uniqKey="Robles J" first="Jordi" last="Robles">Jordi Robles</name><name sortKey="Wiederholt, Kristin" sort="Wiederholt, Kristin" uniqKey="Wiederholt K" first="Kristin" last="Wiederholt">Kristin Wiederholt</name></noCountry><country name="États-Unis"><region name="Massachusetts"><name sortKey="Rajur, Sharanabasava B" sort="Rajur, Sharanabasava B" uniqKey="Rajur S" first="Sharanabasava B." last="Rajur">Sharanabasava B. Rajur</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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