High-Affinity Nucleic-Acid-Based Receptors for Steroids.
High-Affinity Nucleic-Acid-Based Receptors for Steroids.
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DOI:
10.1021/acschembio.7b00634
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发表时间:
2017-12-15
影响因子:
4
通讯作者:
Stojanovic MN
中科院分区:
文献类型:
--
作者:
Yang KA;Chun H;Zhang Y;Pecic S;Nakatsuka N;Andrews AM;Worgall TS;Stojanovic MN
Artificial receptors for hydrophobic molecules usually have moderate affinities and limited selectivities. We describe three new classes of high affinity hydrophobic receptors for non-aromatic steroids based on deoxyribonucleotides, obtained through five high stringency selections coupled with tailored counter-selections. The isolation of multiple classes of high affinity steroid receptors demonstrates the surprising breadth of moderately sized hydrophobic binding motifs (<40 nucleotides) available to natural nucleic acids. Studies of interactions with analogs indicate that two classes, four-way junctions and 4xGN motifs, comprise receptors with shapes that prevent binding of specific steroid conjugates used in counter-selections. Furthermore, they strongly prefer non-hydroxylated steroid cores, which is typical for hydrophobic receptors. The third new class accommodates hydroxyl groups in high-affinity, high-selectivity binding pockets, thus reversing the preferences of the first two classes. The high-affinity binding of aptamers to targets efficiently inhibits double-helix formation in the presence of the complementary oligonucleotides. The high affinity of some of these receptors and tailored elimination of binding through counter-selections ensures that these new aptamers will enable clinical chemistry applications.
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