A single-molecule platform for investigation of interactions between G-quadruplexes and small-molecule ligands.
A single-molecule platform for investigation of interactions between G-quadruplexes and small-molecule ligands.
复制标题
DOI:
10.1038/nchem.1126
复制
发表时间:
2011-08-28
期刊:
影响因子:
21.8
通讯作者:
中科院分区:
文献类型:
--
作者:
Ligands that stabilize the formation of telomeric DNA G-quadruplexes have potential as cancer treatments, because the G-quadruplex structure cannot be extended by telomerase, an enzyme over-expressed in many cancer cells. Understanding the kinetic, thermodynamic and mechanical properties of small-molecule binding to these structures is therefore important, but classical ensemble assays are unable to measure these simultaneously. Here, we have used a laser tweezers method to investigate such interactions. With a force jump approach, we observe that pyridostatin promotes the folding of telomeric G-quadruplexes. The increased mechanical stability of pyridostatin-bound G-quadruplex permits the determination of a dissociation constant Kd of 490 ± 80 nM. The free-energy change of binding obtained from a Hess-like process provides an identical Kd for pyridostatin and a Kd of 42 ± 3 μM for a weaker ligand RR110. We anticipate that this single-molecule platform can provide detailed insights into the mechanical, kinetic and thermodynamic properties of liganded bio-macromolecules, which have biological relevance.
登录
查看更多内容
影响因子:
3.2
作者:
Bugaut A;Rodriguez R;Kumari S;Hsu ST;Balasubramanian S
通讯作者:
Balasubramanian S
影响因子:
15
作者:
Jena, Prakrit V.;Shirude, Pravin S.;Okumus, Burak;Laxmi-Reddy, Katta;Godde, Frederic;Huc, Ivan;Balasubramanian, Shankar;Ha, Taekjip
通讯作者:
Ha, Taekjip
影响因子:
14.9
作者:
Ambrus A;Chen D;Dai J;Bialis T;Jones RA;Yang D
通讯作者:
Yang D
影响因子:
14.9
作者:
Patel, Dinshaw J.;Phan, Anh Tuan;Kuryavyi, Vitaly
通讯作者:
Kuryavyi, Vitaly
影响因子:
14.9
作者:
Lane AN;Chaires JB;Gray RD;Trent JO
通讯作者:
Trent JO