Solvent-Sensitive Dyes to Report Protein Conformational Changes in Living Cells
摘要:
Covalent attachment of solvent-sensitive fluorescent dyes to proteins is a powerful tool for studying protein conformational changes, ligand binding, or posttranslational modifications. We report here new merocyanine dyes that make possible the quantitation of such protein activities in individual living cells. The quantum yield of the new dyes is sharply dependent on solvent polarity or viscosity, enabling them to report changes in their protein environment. This is combined with other stringent requirements needed in a live cell imaging dye, including appropriate photophysical properties (excitation >590 nm, high fluorescence quantum yield, high extinction coefficient), good photostability, minimal aggregation in water, and excellent water solubility. The dyes were derivatized with iodoacetamide and succinimidyl ester side chains for site-selective covalent attachment to proteins. A novel biosensor of Cdc42 activation made with one of the new dyes showed a 3-fold increase in fluorescence intensity in response to GTP-binding by Cdc42. The dyes reported here should be useful in the preparation of live cell biosensors for a diverse range of protein activities.
Solvent-Sensitive Dyes to Report Protein Conformational Changes in Living Cells
摘要:
Covalent attachment of solvent-sensitive fluorescent dyes to proteins is a powerful tool for studying protein conformational changes, ligand binding, or posttranslational modifications. We report here new merocyanine dyes that make possible the quantitation of such protein activities in individual living cells. The quantum yield of the new dyes is sharply dependent on solvent polarity or viscosity, enabling them to report changes in their protein environment. This is combined with other stringent requirements needed in a live cell imaging dye, including appropriate photophysical properties (excitation >590 nm, high fluorescence quantum yield, high extinction coefficient), good photostability, minimal aggregation in water, and excellent water solubility. The dyes were derivatized with iodoacetamide and succinimidyl ester side chains for site-selective covalent attachment to proteins. A novel biosensor of Cdc42 activation made with one of the new dyes showed a 3-fold increase in fluorescence intensity in response to GTP-binding by Cdc42. The dyes reported here should be useful in the preparation of live cell biosensors for a diverse range of protein activities.
The presently disclosed subject matter provides dyes having an improved photostability, biosensors comprising such dyes, and methods of use thereof, including methods for detecting target molecules in a sample under test and for live-cell imaging. The dyes can include a binding member, including a biomolecule or fragments thereof, which can interact with target molecules of interest and can be specific to a given conformational state or covalent modification, e.g., phosphorylation, of the target molecule. The presently disclosed dyes can be used for detecting changes in the binding, conformational change, or posttranslational modification of the target molecule.
[EN] SULFHYDRYL-REACTIVE, WATER SOLUBLE DYES<br/>[FR] COLORANTS HYDROSOLUBLES, RÉACTIFS AVEC LE SULFHYDRYLE
申请人:SCRIPPS RESEARCH INST
公开号:WO2008027075A2
公开(公告)日:2008-03-06
[EN] The invention relates to novel dye compounds and to methods of joining compounds, such as the dye compounds of the invention, to ulfhydryl-containing compounds. [FR] L'invention concerne de nouveaux composés colorants et des procédés de liaison de composés, par exemple les composés colorants selon l'invention, à des composés contenant du sulfhydryle.
[EN] METHODS TO INCREASE THE PHOTOSTABILITY<br/>[FR] PROCÉDÉS POUR ACCROÎTRE LA PHOTOSTABILITÉ
申请人:UNIV NORTH CAROLINA
公开号:WO2008157762A2
公开(公告)日:2008-12-24
(EN) The presently disclosed subject matter provides dyes having an improved photostability, biosensors comprising such dyes, and methods of use thereof, including methods for detecting target molecules in a sample under test and for live- cell imaging. The dyes can include a binding member, including a biomolecule or fragments thereof, which can interact with target molecules of interest and can be specific to a given conformational state or covalent modification, e.g., phosphorylation, of the target molecule. The presently disclosed dyes can be used for detecting changes in the binding, conformational change, or posttranslational modification of the target molecule.(FR) La présente invention concerne des colorants qui présentent une meilleure photostabilité, des biocapteurs comprenant ces colorants et des procédés d'utilisation de ces derniers, y compris des procédés de détection de molécules cibles dans un échantillon soumis à un essai et pour l'imagerie de cellules vivantes. Les colorants peuvent comprendre un élément de liaison renfermant une biomolécule ou un fragment de cette dernière, qui peut interagir avec des molécules cibles présentant un intérêt et qui peuvent être spécifiques d'un état conformationnel donné ou d'une modification covalente donnée, par exemple, la phosphorylation, de la molécule cible. Les colorants selon la présente invention peuvent être utilisés pour détecter des changements concernant la liaison, le changement conformationnel ou la modification post-traduction de la molécule cible.
Solvent-Sensitive Dyes to Report Protein Conformational Changes in Living Cells
作者:Alexei Toutchkine、Vadim Kraynov、Klaus Hahn
DOI:10.1021/ja0290882
日期:2003.4.1
Covalent attachment of solvent-sensitive fluorescent dyes to proteins is a powerful tool for studying protein conformational changes, ligand binding, or posttranslational modifications. We report here new merocyanine dyes that make possible the quantitation of such protein activities in individual living cells. The quantum yield of the new dyes is sharply dependent on solvent polarity or viscosity, enabling them to report changes in their protein environment. This is combined with other stringent requirements needed in a live cell imaging dye, including appropriate photophysical properties (excitation >590 nm, high fluorescence quantum yield, high extinction coefficient), good photostability, minimal aggregation in water, and excellent water solubility. The dyes were derivatized with iodoacetamide and succinimidyl ester side chains for site-selective covalent attachment to proteins. A novel biosensor of Cdc42 activation made with one of the new dyes showed a 3-fold increase in fluorescence intensity in response to GTP-binding by Cdc42. The dyes reported here should be useful in the preparation of live cell biosensors for a diverse range of protein activities.