the approach could be useful in the identification of initial binding molecules for difficult drug targets, such as those involved in protein–protein interactions. As an application, we will report novel agents targeting the Bcl-2 family protein hMcl-1. The approach is of general applicability and could be deployed as an effective screening strategy for de novo identification of ligands, particularly
A Simple and Versatile Route to Stable Quantum Dot−Dye Hybrids in Nonaqueous and Aqueous Solutions
作者:Ting Ren、Prasun K. Mandal、Wolfgang Erker、Zhihong Liu、Yuri Avlasevich、Larissa Puhl、Klaus Müllen、Thomas Basché
DOI:10.1021/ja8073962
日期:2008.12.24
Hybrid systems consisting of core/shell semiconductor quantum dots (QDs) and organic rylene dyes have been prepared and characterized. Complex formation is mediated by bidentate carboxylate moieties covalently linked to the dye molecules. The complexes were very stable with respect to time (at least months), dilution (sub nM), and precipitation. After preparation in organic solvent, complexes could be easily transferred into water. The strong quenching of QD emission by the dye molecules (transfer efficiencies up to 95%) was satisfactorily modeled by an FRET process. Single complexes immobilized in thin polymer films were imaged by confocal fluorescence microscopy.
α-Helix Stabilization within a Peptide Dendrimer
作者:Sacha Javor、Antonino Natalello、Silvia Maria Doglia、Jean-Louis Reymond
DOI:10.1021/ja8076236
日期:2008.12.24
alpha-helical second generation peptide dendrimer of sequence (AcAMEA)(4)(KKLME)(2)KMKLA is more stable than the corresponding linear peptide AcAMEAAKLMEAMKLA toward pH-induced unfolding and temperature-induced intermolecular aggregation. The effect is interpreted in terms of an alpha-helix spanning across two successive branching points of the dendrimer. This stabilization effect is unprecedented and