180185-77-7Relevant academic research and scientific papers
Stereospecific modulation of dimeric rhodopsin
Chen, Yuanyuan,Getter, Tamar,Gulati, Sahil,Palczewski, Krzysztof,Vinberg, Frans,Zimmerman, Remy
, p. 9526 - 9539 (2019)
The classic concept that GPCRs function as monomers has been challenged by the emerging evidence of GPCR dimerization and oligomerization. Rhodopsin (Rh) is the only GPCR whose native oligomeric arrangement was revealed by atomic force microscopy demonstrating that Rh exists as a dimer. However, the role of Rh dimerization in retinal physiology is currently unknown. In this study, we identified econazole and sulconazole, two small molecules that disrupt Rh dimer contacts, by implementing a cell-based high-throughput screening assay. Racemic mixtures of identified lead compounds were separated and tested for their stereospecific binding to Rh using UV-visible spectroscopy and intrinsic fluorescence of tryptophan (Trp) 265 after illumination. By following the changes in UV-visible spectra and Trp265 fluorescence in vitro, we found that binding of R-econazole modulates the formation of Meta III and quenches the intrinsic fluorescence of Trp265. In addition, electrophysiological ex vivo recording revealed that R-econazole slows photoresponse kinetics, whereas S-econazole decreased the sensitivity of rods without effecting the kinetics. Thus, this study contributes new methodology to identify compounds that disrupt the dimerization of GPCRs in general and validates the first active compounds that disrupt the Rh dimer specifically.—Getter, T., Gulati, S., Zimmerman, R., Chen, Y., Vinberg, F., Palczewski, K. Stereospecific modulation of dimeric rhodopsin. FASEB J. 33, 9526–9539 (2019). www.fasebj.org.
Diastereoselective α-Sulfenylation of N- tert-Butanesulfinyl Imidates
Niu, Sheng-Tong,Liu, Hui,Xu, Yan-Jun,Lu, Chong-Dao
, p. 10580 - 10588 (2018/09/18)
A diastereoselective α-sulfenylation of chiral α-aryl/alkyl N-tert-butanesulfinyl imidates has been developed. Suitable sulfur electrophiles can be used as sulfenylating reagents to intercept aza-enolates generated from imidate deprotonation, giving α-thiofunctionalized imidates in good yields with high diastereocontrol. This protocol for C-S bond formation can efficiently synthesize enantioenriched 1,2-sulfanyl amine derivatives such as sulconazole.
Enantio- and diastereoselective addition of thioacetic acid to nitroalkenes via N-sulfinyl urea catalysis
Kimmel, Kyle L.,Robak, Maryann T.,Thomas, Stephen,Lee, Melissa,Ellman, Jonathan A.
scheme or table, p. 2704 - 2712 (2012/04/17)
The enantioselective addition of thioacetic acid to nitroalkenes was achieved using N-sulfinyl urea catalysis. In this report, the scope of the reaction was extended to the enantio- and diastereoselective thioacetic acid addition to cyclic α,β-disubstitut
Enantioselective addition of thioacetic acid to nitroalkenes via N-sulfinyl urea organocatalysis
Kimmel, Kyle L.,Robak, MaryAnn T.,Ellman, Jonathan A.
supporting information; experimental part, p. 8754 - 8755 (2009/12/04)
(Chemical Equation Presented) The highly enantioselective addition of thioacetic acid to nitroalkenes using a new sulfinyl urea organocatalyst is described. The addition of thioacetic acid proceeds in high yields and enantioselectivities for a variety of
