Solution structure of a thrombin binding aptamer complex with a non-planar platinum(ii) compound.
Solution structure of a thrombin binding aptamer complex with a non-planar platinum(ii) compound.
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具有非平面铂 (II) 化合物的凝血酶结合适体复合物的溶液结构
DOI:
10.1039/d2sc01196d
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发表时间:
2022-07-20
期刊:
影响因子:
8.4
通讯作者:
中科院分区:
文献类型:
--
作者:
Thrombin Binding Aptamer (TBA) is a monomolecular well-defined two G-tetrad antiparallel G-quadruplex DNA that inhibits the activity of human α-thrombin. In this report, we synthesized a quasi-cross-shaped platinum(ii) compound (L′2LPt) with one cyclometalated and two carbene ligands. We found L′2LPt has selective affinity to bind the TBA G-quadruplex. A fibrinogen clotting assay revealed that L′2LPt can abrogate the inhibitory activity of TBA against thrombin. We solved the 1 : 1 L′2LPt–TBA complex structure by NMR, which revealed a unique self-adaptive property of L′2LPt upon binding to TBA. In the complex, a carbene ligand of L′2LPt rotates to pair with the cyclometalated ligand to form a plane stacking over half of the TBA G-tetrad and covered by lateral TT loops. It is notable that the heavy atom Pt stays out of the G-tetrad. Meanwhile, the other carbene ligand remains relatively perpendicular and forms a hydrogen bond with a guanine to anchor the L′2LPt position. This structure exhibits a quasi-cross-shaped Pt(ii) compound bound to the G-quadruplex with an unusual “wall-mounted” binding mode. Our structures provide insights into the specific recognition of antiparallel G-quadruplex DNA by a self-adaptive Pt(ii) compound and useful information for the design of selective G-quadruplex targeting non-planar molecules. A quasi-cross-shaped platinum(II) compound (L′2LPt) with inhibitory activity against thrombin binds the antiparallel two-G-tetrad G-quadruplex TBA. The NMR structure of the Pt–G-quadruplex was solved to reveal this unusual “wall-mounted” binding mode.
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