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.
DOI:
10.1021/ja0290882
作为产物:
描述:
1,3,3-三甲氧基丙烯 、 苯并[b]噻吩-3(2H)-酮-1,1-二氧化物 在
甲醇 作用下,
反应 12.0h,
以to give 1.88 g (75% yield) of final product的产率得到(2E)-2-[(2E)-3-methoxyprop-2-enylidene]-1-benzothiophen-3(2H)-one 1,1-dioxide
<scp>Wash‐free</scp>
,
<scp>peptide‐based</scp>
fluorogenic probes for microbial imaging
作者:Assel Baibek、Muhammed Üçüncü、Elizabeth A. Blackburn、Mark Bradley、Annamaria Lilienkampf
DOI:10.1002/pep2.24167
日期:2021.1
labeling of all microbial species, whereas probes with a mixture of l or d‐amino acids failed to label fungi or bacteria, highlighting the importance of the α‐helical peptide structure for interaction with the microbial cell membrane. Importantly, the nature of the dye allowed fluorescence detection/labeling without the need for a wash step, paving the way for direct application of the probes.
The invention provides dyes, biosensors, and methods for using the dyes and biosensors to detect selected target molecules. The biosensors have a binding domain and a dye, or a dye which is attached directly to the target of interest. Binding domains contemplated by the invention include biomolecules or fragments of biomolecules that interact with target molecules of interest and can be specific to a given conformational state or covalent modification of the molecule (e.g. phosphorylation). In one embodiment, the binding domain of a biosensor is a single chain variable fragment (scFv) with a dye of the invention linked to a CDR3 region. The invention also provides environmentally sensitive dyes useful for detecting changes in the binding, conformational change, or posttranslational modification of the selected target.
[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.