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Design of nucleotide-mimetic and non-nucleotide inhibitors of the translation initiation factor eIF4E: synthesis, structural and functional characterisation

Soukarieh, Fadi; Nowicki, Matthew W.; Bastide, Amandine; Poyry, Tuija; Jones, Carolyn; Dudek, Kate; Patwardhan, Geetanjali; Meullenet, François; Oldham, Neil J.; Walkinshaw, Malcolm D.; Willis, Anne E.; Fischer, Peter M.

Authors

Fadi Soukarieh

Matthew W. Nowicki

Amandine Bastide

Tuija Poyry

Carolyn Jones

Kate Dudek

Geetanjali Patwardhan

François Meullenet

Neil J. Oldham

Malcolm D. Walkinshaw

Anne E. Willis

Peter M. Fischer

Abstract

Eukaryotic translation initiation factor 4E (eIF4E) is considered as the corner stone in the cap-dependent translation initiation machinery. Its role is to recruit mRNA to the ribosome through recognition of the 50 - terminal mRNA cap structure (m7 GpppN, where G is guanosine, N is any nucleotide). eIF4E is implicated in cell transformation, tumourigenesis, and angiogenesis by facilitating translation of oncogenic mRNAs; it is thus regarded as an attractive anticancer drug target. We have used two approaches to design capbinding inhibitors of eIF4E by modifying the N7 -substituent of m7 GMP and replacing the phosphate group with isosteres such as squaramides, sulfonamides, and tetrazoles, as well as by structure-based virtual screening aimed at identifying non-nucleotide cap-binding antagonists. Phosphomimetic nucleotide derivatives and highly ranking virtual hits were evaluated in a series of in vitro and cell-based assays to identify the first non-nucleotide eIF4E cap-binding inhibitor with activities in cell-based assays, N-[(5,6-dihydro-6-oxo-1,3-dioxolo[4,5-g]quinolin-7-yl)methyl]-N0 -(2-methyl-propyl)-N-(phenylmethyl)thiourea (14), including down-regulation of oncogenic proteins and suppression of RNA incorporation into polysomes. Although we did not observe cellular activity with any of our modified m7 GMP phosphate isostere compounds, we obtained X-ray crystallography structures of three such compounds in complex with eIF4E, 50 -deoxy-50 -(1,2-dioxo-3-hydroxycyclobut-3-en-4-yl)amino-N7 -methyl-guanosine (4a), N7 -3-chlorobenzyl-50 -deoxy-50 -(1,2-dioxo-3-hydroxy-cyclobut-3-en-4-yl)amino-guanosine (4f), and N7 -benzyl-50 -deoxy-50 -(trifluoromethyl-sulfamoyl)guanosine (7a). Collectively, the data we present on structure-based design of eIF4E cap-binding inhibitors should facilitate the optimisation of such compounds as potential anticancer agents.

Journal Article Type Article
Publication Date Nov 29, 2016
Journal European Journal of Medicinal Chemistry
Print ISSN 0223-5234
Electronic ISSN 0223-5234
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 124
DOI https://doi.org/10.1016/j.ejmech.2016.08.047
Keywords Cancer; eIF4E; protein synthesis; mRNA translation;
cap-binding inhibitor
Publisher URL http://www.sciencedirect.com/science/article/pii/S0223523416307000
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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