Fluorescent Sensors for Zn2+ Based on a Fluorescein Platform: Synthesis, Properties and Intracellular Distribution
摘要:
Two new fluorescent sensors for Zn2+ that utilize fluorescein as a reporting group, Zinpyr-1 and Zinpyr-2, have been synthesized and characterized. Zinpyr-1 is prepared in one step via a Mannich reaction, and Zinpyr-2 is obtained in a multistep synthesis that utilizes 4 ' ,5 ' -fluorescein dicarboxaldehyde as a key intermediate. Both Zinpyr sensors have excitation and emission wavelengths in the visible range (similar to 500 nm), dissociation constants (K-d1) for Zn2+ of <1 nM, quantum yields approaching unity (Phi = similar to0.9), and cell permeability, making them well-suited for intracellular applications. A 3- to 5-fold fluorescent enhancement is observed under simulated physiological conditions corresponding to the binding of the Zn2+ cation to the sensor, which inhibits a photoinduced electron transfer (PET) quenching pathway. The X-ray crystal structure of a 2:1 Zn2+:Zinpyr-1 complex has also been solved, and is the first structurally characterized example of a complex of fluorescein substituted with metal binding ligands.
Labels are disclosed capable of forming a covalent or non-covalent bond with a target molecule, particularly a biological molecule. The structure of these labels may consist of a dye covalently bound by one or more carbons on its chemical structure to one or more [FUNC] group(s), and optionally one or more [SOL] group(s). The structure of these labels allow selection of dyes from a wide variety of different excitation and emission wavelengths and allow easy functionalization of the dye without appreciably altering its spectral characteristics or its solubility characteristics.
Solvent-Free Synthesis of Sulfonephthaleins, Sulfonefluoresceins and Fluoresceins Under Microwave Irradiation
作者:Simon Cihelník、Ivan Stibor、Pavel Lhoták
DOI:10.1135/cccc20021779
日期:——
An efficient solvent-free synthesis of sulfonephthaleins, sulfonefluoresceins and fluoresceins under microwave irradiation is reported.
报道了一种高效的无溶剂合成磺酮邻苯二甲酸酯、磺酮荧光素和荧光素的方法,在微波辐射下进行。
Synthetic molecules for labeling histidine-rich proteins
申请人:——
公开号:US20040143122A1
公开(公告)日:2004-07-22
The invention provides Zn-chelating compounds that are molecularly engineered to bind to a specific target sequence in a protein of interest. The Zn
2+
0 ion is far less toxic and promiscuous than nickel and therefore provides an attractive alternative to Ni-based labeling systems. Invention Zn-chelating compounds also do not require oxidizable thiols and therefore can be used in non-reducing environments such as the surface of living cells. In addition, the target sequence is genetically encodable and requires incorporation of only a few amino acids, unlike fusions to fluorescent proteins such as GFP.
Fluorescein-based metal sensors, and methods of making and using the same
申请人:——
公开号:US20020106697A1
公开(公告)日:2002-08-08
The present invention is directed, in part, to fluorescein-based ligands for detection of metal ions, and methods of making and using the same.
本发明部分涉及用于检测金属离子的荧光素基配体,以及制备和使用它们的方法。
High purity phthalein derivatives and method for preparing same
申请人:Tran-Guyon Joanne
公开号:US20060106234A1
公开(公告)日:2006-05-18
The invention concerns high purity phthalcin derivatives enabling their use for medical applications or in the field of biotechnology, as well as their preparation method whereby a phthatic anhydride derivative is condensed with a naphthol or phenol derivative in an organic acid ester and the crystals of the resulting condensate are converted by action of a strong acid or one of its precursors in anhydrous medium.