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. 2012 Jul 4;134(26):10791-4.
doi: 10.1021/ja304205m. Epub 2012 Jun 25.

Photocontrolled binding and binding-controlled photochromism within anthracene-modified DNA

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Free PMC article

Photocontrolled binding and binding-controlled photochromism within anthracene-modified DNA

Jack Manchester et al. J Am Chem Soc. .
Free PMC article

Abstract

Modified DNA strands undergo a reversible light-induced reaction involving the intramolecular photodimerization of two appended anthracene tags. The photodimers exhibit markedly different binding behavior toward a complementary strand that depends on the number of bases between the modified positions. By preforming the duplex, photochromism can be suppressed, illustrating dual-mode gated behavior.

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Figures

Scheme 1
Scheme 1. The S3-AS3-AP Photochromic System, in Which the Anthracene Photodimer Consists of the Head-to-Tail Isomer
Figure 1
Figure 1
Structures of the anucleosidic groups X and Y when incorporated into DNA (phosphodiester groups toward 3′ end).
Figure 2
Figure 2
Normalized graphs showing the change in absorbance as a function of temperature for T0 in the presence of S3-A (red) and S3-AP (dashed blue).
Figure 3
Figure 3
CD spectra of T0 with 1 molar equivalent of S3-A (red), with 1 molar equivalent of S3-AP (dashed blue), and measured alone and then mathematically added to an independent spectrum of S3-AP (black). Conditions: 5 μM, pH 7.0, 10 mM sodium phosphate buffer, 250 mM NaCl, 293 K.
Figure 4
Figure 4
20% Native-PAGE experiment illustrating differing duplex-forming abilities with T0 between strands S0, S2-A, and S2-AP: lane 1, S0; lane 2, T0; lane 3, S0 + T0; lane 4, S2-AP; lane 5, S2-AP + T0; lane 6, S2-A; lane 7, S2-A + T0. Conditions: 25 mM NaCl, 1× TB, 24 h at 100 V, 293 K.
Scheme 2
Scheme 2. Representation of Photocontrolled Binding of T0 and Binding-Controlled Photoreactivity within the S3-AS3-AP Photochromic System

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