Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Computational studies towards the identification of novel rhodopsin-binding compounds as chemical chaperones for misfolded opsins

Pasqualetto, Gaia, Schepelmann, Martin, Varricchio, Carmine, Pileggi, Elisa, Khogali, Caroline, Morgan, Siân R., Boostrom, Ian, Rozanowska, Malgorzata, Brancale, Andrea, Ferla, Salvatore and Bassetto, Marcella 2020. Computational studies towards the identification of novel rhodopsin-binding compounds as chemical chaperones for misfolded opsins. Molecules 25 (21) , 4904. 10.3390/molecules25214904

[img] PDF (Creative Commons Attribution License 4.0) - Published Version
Download (10MB)

Abstract

Accumulation of misfolded and mistrafficked rhodopsin on the endoplasmic reticulum of photoreceptor cells has a pivotal role in the pathogenesis of retinitis pigmentosa and a subset of Leber’s congenital amaurosis. One potential strategy to reduce rhodopsin misfolding and aggregation in these conditions is to use opsin-binding compounds as chemical chaperones for opsin. Such molecules have previously shown the ability to aid rhodopsin folding and proper trafficking to the outer cell membranes of photoreceptors. As means to identify novel chemical chaperones for rhodopsin, a structure-based virtual screening of commercially available drug-like compounds (300,000) was performed on the main binding site of the visual pigment chromophore, the 11-cis-retinal. The best 24 virtual hits were examined for their ability to compete for the chromophore-binding site of opsin. Among these, four small molecules demonstrated the ability to reduce the rate constant for the formation of the 9-cis-retinal-rhodopsin complex, while five molecules surprisingly enhanced the formation of this complex. Compound 7, 13, 20 and 23 showed a weak but detectable increase in the trafficking of the P23H mutant, widely used as a model for both retinitis pigmentosa and Leber’s congenital amaurosis, from the ER to the cell membrane. The compounds did not show any relevant cytotoxicity in two different human cell lines, with the only exception of 13. Based on the structures of these active compounds, a series of in silico studies gave important insights on the potential structural features required for a molecule to act either as chemical chaperone or as stabiliser of the 11-cis-retinal-rhodopsin complex. Thus, this study revealed a series of small molecules that represent a solid foundation for the future development of novel therapeutics against these severe inherited blinding diseases.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Pharmacy
Optometry and Vision Sciences
Biosciences
Publisher: MDPI
ISSN: 1420-3049
Funders: Wellcome Trust
Date of First Compliant Deposit: 29 October 2020
Date of Acceptance: 21 October 2020
Last Modified: 06 Nov 2020 09:44
URI: http://orca.cf.ac.uk/id/eprint/136016

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics