Fluorescent labeling of specific protein targets in vitro and in vivo
申请人:Keillor W. Jeffrey
公开号:US20060147948A1
公开(公告)日:2006-07-06
New methods are provided for the post-genomic era that will permit the analysis of the dynamic expression and localization of gene products in living cells. Herein we propose the development of such a method from a bioorganic approach involving organic synthesis and protein engineering. Specifically, novel compounds bearing two maleimide groups attached directly to fluorescent cores will be prepared, whose latent fluorescence is quenched until their maleimide groups undergo a specific thiol addition reaction. Complementary a-helical proteins are designed bearing two cysteine residues appropriately positioned to react with our novel fluorogens. Genetically fusing our helical probe peptides to test proteins of interest, we can selectively label the target sequence in living cells with our small synthetic fluorogenic molecules. The scope of this technique is described in the context of studying protein localization and protein-protein interactions in living cells.
Synthesis and Characterization of Dimaleimide Fluorogens Designed for Specific Labeling of Proteins
作者:Stéphane Girouard、Marie-Hélène Houle、Alain Grandbois、Jeffrey W. Keillor、Stephen W. Michnick
DOI:10.1021/ja045742x
日期:2005.1.1
spectral characterization studies. In this way, the title compounds serve as fluorogens capable of detection of small thiols or appropriately sized dithiols. Recombinant alpha-helical proteins were then designed to bear two cysteine residues capable of regioselective dithiol addition reaction with the dimaleimide fluorogens, thus acting as spatially encoded substrates that form specifically labeled covalent