Dynamic Devices. Shape Switching and Substrate Binding in Ion-Controlled Nanomechanical Molecular Tweezers
作者:Anne Petitjean、Richard G. Khoury、Nathalie Kyritsakas、Jean-Marie Lehn
DOI:10.1021/ja031915r
日期:2004.6.1
As examples of supramolecular devices performing chemical (ionic, molecular) control of binding events and models of related natural systems, two molecular conformational switches are described, which display cation-controlled nanomechanical motion coupled to substrate binding and release. The substrate binding relies on donor/acceptor interactions, provided by intercalation between planar sites located at the extremities of the switching units, whereas cation complexation is responsible for conformational regulation. The terpyridine py-py-py-based receptor is activated toward substrate binding upon complexation of a zinc(II) cation and operates in a two-state process. The replacement of the central pyridine by a 4,6-disubstituted pyridimine as in py-pym-py induces a state reversal and yields a new receptor which binds a substrate in the absence of cation, and releases it when copper(I) is introduced, following a three-step process. These systems represent effector-triggered supramolecular switching devices leading toward multistate nanomechanical chemical systems. These two systems illustrate the use of simple conformational switches in the binding site and allosteric regulation of substrate affinity.
Compositions and methods for treating cancer and other diseases characterized by abnormal cell proliferation
申请人:Lehn Jean-Marie
公开号:US20080119492A1
公开(公告)日:2008-05-22
The present invention relates to compositions and methods for treating cancer and other disease states characterized by abnormal cell proliferation. In particular, the present invention relates to certain novel non-nucleoside pharmacologically active compounds that alter telomere and telomerase functions, regulate cell proliferation and/or treat cancer and other diseases characterized by abnormal cell proliferation. The present invention also pertains to pharmaceutical compositions comprising such compounds, and the use of such compounds and compositions, both in vitro and in vivo, to inhibit telomerase, to regulate cell proliferation, and to treat cancer or to inhibit the proliferation of the rumor cells, and to treat other proliferative conditions.