Synthesis and DNA cleavage activity of triazacrown-anthraquinone conjugatesElectronic supplementary information (ESI) available: Spectra for all new compounds, agarose gel electrophoretogram and kinetic data. See DOI: 10.1039/c0nj00347f
1,4,7-Triazacyclononane (TACN), with DNA cleaving ability, was appended to anthraquinone via different spacers to construct the new compounds 1,8-[2,2′-(1,4,7-triazacyclonon)diethoxy] anthracene-9,10-dione hydrochloride ( 1 ) and 1,8-[2,2′-(1,4,7-triazacyclonon)dihexyloxy] anthracene-9,10-dione hydr...
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Main Authors | , , , , , , |
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Format | Journal Article |
Language | English |
Published |
01.11.2010
|
Online Access | Get full text |
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Summary: | 1,4,7-Triazacyclononane (TACN), with DNA cleaving ability, was appended to anthraquinone
via
different spacers to construct the new compounds 1,8-[2,2′-(1,4,7-triazacyclonon)diethoxy] anthracene-9,10-dione hydrochloride (
1
) and 1,8-[2,2′-(1,4,7-triazacyclonon)dihexyloxy] anthracene-9,10-dione hydrochloride (
2
) as new agents for metal-free DNA cleavage. Fluorescence and CD spectroscopic studies suggest an intercalating DNA binding mode, and the apparent DNA binding constants of
1
and
2
are 3.93 × 10
7
and 6.07 × 10
7
M
−1
, respectively. Compound
2
, bearing the longer spacer, exhibits the higher DNA binding ability. The apparent initial first-order rate constant (
k
obs
) of DNA cleavage promoted by
1
and
2
(0.05 mM) in physiological media are 0.077 ± 0.0028 and 0.123 ± 0.0027 h
−1
, respectively. The 51-fold and 82-fold rate accelerations over parent TACN (the
k
obs
is 0.0015 ± 0.00003 h
−1
(0.05 mM) under the same conditions) are due to the anthraquinone moiety of compounds
1
and
2
intercalating into the DNA base pairs
via
stacking interactions. ESI-MS analysis of the dinucleotide cleavage promoted by
1
and
2
, and radical scavenger inhibition studies suggest that the cleavage process is a hydrolytic mechanism.
Two triazacrown-anthraquinone conjugates were synthesized as new metal-free DNA cleaving reagents, and their cleavage efficiency, interactions with DNA were studied by spectroscopic techniques and agarose gel electrophoresis. |
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Bibliography: | 10.1039/c0nj00347f Electronic supplementary information (ESI) available: Spectra for all new compounds, agarose gel electrophoretogram and kinetic data. See DOI |
ISSN: | 1144-0546 1369-9261 |
DOI: | 10.1039/c0nj00347f |