Fluorescent Pirenzepine Derivatives as Potential Bitopic Ligands of the Human M1 Muscarinic Receptor
摘要:
Following a recent description of fluorescence resonance energy transfer between enhanced green fluorescent protein (EGFP)-fused human muscarinic M1 receptors and Bodipy-labeled pirenzepine, we synthesized seven fluorescent derivatives of this antagonist in order to further characterize ligand-receptor interactions. These compounds carry Bodipy [558/568], Rhodamine Red-X [560/580], or Fluorolink Cy3 [550/570] fluorophores connected to pirenzepine through various linkers. All molecules reversibly bind with high affinity to M1 receptors (radioligand and energy transfer binding experiments) provided that the linker contains more than six atoms. The energy transfer efficiency exhibits modest variations among ligands, indicating that the distance separating EGFP from the fluorophores remains almost constant. This also supports the notion that the fluorophores may bind to the receptor protein. Kinetic analyses reveal that the dissociation of two Bodipy derivatives (10 or 12 atom long linkers) is sensitive to the presence of the allosteric modulator brucine, while that of all other molecules (15-24 atom long linkers) is not. The data favor the idea that these analogues might interact with both the acetylcholine and the brucine binding domains.
An efficient approach to the synthesis of water-soluble cyanine dyes using poly(ethylene glycol) as a soluble support
作者:Lin-Ling Jiang、Li-Fang Dou、Bao-Lin Li
DOI:10.1016/j.tetlet.2007.06.060
日期:2007.8
An efficient synthesis approach to unsymmetrical water-soluble cyanine dyes has been established. Loading and activation of sulfoindolenium to poly(ethyleneglycol) (PEG) have been achieved via a simple strategy. Cyanine dyes are released by the attack of heterocyclic carbon nucleophile and the cleavage of PEG-bound hemicyanine. The efficient approach delivers cyanine dyes in high purity without the
The present disclosure is directed to a reactive ester agent capable of conjugating a reporter molecule to a carrier molecule or solid support. The reactive ester agent has the general formula:
wherein the variables are described throughout the application.
Cyanine compound for labeling biomolecule and preparation method thereof
申请人:Kim Dong Jin
公开号:US08729276B2
公开(公告)日:2014-05-20
Disclosed are a novel cyanine compound, represented by the following Formula 1, for labeling biomolecules, and a method for preparing the same.
wherein R1, R2, R3, R4, B, m and n are defined as above.
FLUORESCENCE COMPOUNDS AND PREPARATION METHOD THEREOF
申请人:BioActs Co., Ltd.
公开号:US20170313883A1
公开(公告)日:2017-11-02
Provided is a fluorescent compound represented by the following [Chemical Formula 1] and a method for preparing the same:
wherein each of X, Y, R
1
, R
2
, R
3
and n is the same as defined in the specification.