Characteristic Fluorescence Response of (6-Hydroxy-2-naphthyl)ethenyl Pyridinium Dyes with Bovine Serum Albumin
作者:Myung-Seok Choi、Ankush Gupta、Jung Hwa Seo、S. Velmathi、James N. Wilson、Jong S. Park
DOI:10.1002/bkcs.10055
日期:2015.1
this study, we report the efficient identification of proteins using (6‐hydroxy‐2‐naphthyl)ethenylpyridiniumdyes (HNEPs). These dyes exhibited characteristicfluorescenceresponses, showing enhanced fluorescence with a red shift in the case of bovineserumalbumin. The nature of the interaction between the dye and the protein was examined using a combination of various spectroscopic techniques. A time‐dependent
Fluorescent stilbazolium dyes as probes of the norepinephrine transporter: structural insights into substrate binding
作者:James N. Wilson、Adrienne S. Brown、W. Michael Babinchak、Clark D. Ridge、Jamie D. Walls
DOI:10.1039/c2ob26633d
日期:——
We report the synthesis, binding kinetics, optical spectroscopy and predicted binding modes of a series of sterically demanding, fluorescent norepinephrine transporter (NET) ligands. A series of bulky stilbazolium dyes, including six newly synthesized compounds, were evaluated to determine the effect of extending the molecular probes’ ‘heads’ or ‘tails’. Taking advantage of the dyes’ characteristic ‘turn-on’ emission, the kinetic binding parameters, kon and koff were determined revealing that extension of the molecules’ tails is well tolerated while expansion of the head is not. Additionally, a ‘headfirst’ orientation appears to be preferred over a ‘tail-first’ binding pose. Further details of the possible binding modes were obtained from the emission spectra of the bound probes. A small range of interplanar twist angles, approximately 35° to 60°, is predicted to produce the observed emission. Docking experiments and molecular modelling support the kinetic and spectroscopic data providing structural insights into substrate binding.