Effect of preorganization on the affinity of synthetic DNA binding motifs for nucleotide ligands.
Effect of preorganization on the affinity of synthetic DNA binding motifs for nucleotide ligands.
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预组织对合成 DNA 结合基序与核苷酸配体亲和力的影响
DOI:
10.1039/c5ob00508f
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发表时间:
2015
影响因子:
3.2
通讯作者:
C. Richert
中科院分区:
文献类型:
--
作者:
S. Vollmer;C. Richert
Triplexes with a gap in the purine strand have been shown to bind adenosine or guanosine derivatives through a combination of Watson–Crick and Hoogsteen base pairing. Rigidifying the binding site should be advantageous for affinity. Here we report that clamps delimiting the binding site have a modest effect on affinity, while bridging the gap of the purine strand can strongly increase affinity for ATP, cAMP, and FAD. The lowest dissociation constants were measured for two-strand triple helical motifs with a propylene bridge or an abasic nucleoside analog, with Kd values as low as 30 nM for cAMP in the latter case. Taken together, our data suggest that improving preorganization through covalent bridges increases the affinity for nucleotide ligands. But, a bulky bridge may also block one of two alternative binding modes for the adenine base. The results may help to design new receptors, switches, or storage motifs for purine-containing ligands.
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