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DNA–porphyrin conjugates were designed and synthesized in which free-base and Zn-coordinated porphyrins were introduced to the N 6 -position of the internal adenosine. Conformations of the porphyrin dimer in the major groove of duplex DNA were controlled by changing the orientation and the distance between the two porphyrin moieties. The porphyrin dimers formed a thermally favorable face-to-face...
The fluorescent base 2-aminopurine (2Ap) was incorporated into the human telomeric DNA sequence d[AGGG(TTAGGG) 3 ]. The substitution of 2Ap for A in the TTA loops did not affect the G-quadruplex stability. Interestingly, a significant change in the fluorescence intensity of 2Ap between the G-quadruplex and duplex was observed. Therefore, we demonstrated that 2Ap can be used to monitor the...
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