SDR enzymes oxidize specific lipidic alkynylcarbinols into cytotoxic protein-reactive species - Département GA INRAE Access content directly
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SDR enzymes oxidize specific lipidic alkynylcarbinols into cytotoxic protein-reactive species

Pascal Demange
Etienne Joly
Julien Marcoux
Patrick R A Zanon
Dymytrii Listunov
Pauline Rullière
Cécile Barthes
Céline Noirot
Jean-Baptiste Izquierdo
  • Function : Author
Karen Pradines
  • Function : Author
Romain Hee
  • Function : Author
Maria Vieira de Brito
Marlène Marcellin
Rémi-Félix Serre
  • Function : Author
Olivier Bouchez
Odile Burlet-Schiltz
Maria Conceição Ferreira Oliveira
Stéphanie Ballereau
Vania Bernardes-Génisson
Valérie Maraval
Patrick Calsou
Stephan M Hacker
Yves Génisson
Remi Chauvin
Sébastien Britton


ABSTRACT Hundreds of cytotoxic natural or synthetic lipidic compounds contain chiral alkynylcarbinol motifs, but the mechanism of action of those potential therapeutic agents remains unknown. Using a genetic screen in haploid human cells, we discovered that the enantiospecific cytotoxicity of numerous terminal alkynylcarbinols, including the highly cytotoxic dialkynylcarbinols, involves a bioactivation by HSD17B11, a short-chain dehydrogenase/reductase (SDR) known to oxidize the C-17 carbinol center of androstan-3-alpha,17-beta-diol to the corresponding ketone. A similar oxidation of dialkynylcarbinols generates dialkynylketones, that we characterize as highly protein-reactive electrophiles. We established that, once bioactivated in cells, the dialkynylcarbinols covalently modify several proteins involved in protein-quality control mechanisms, resulting in their lipoxidation on cysteines and lysines through Michael addition. For some proteins, this triggers their association to cellular membranes and results in endoplasmic reticulum stress, unfolded protein response activation, ubiquitin-proteasome system inhibition and cell death by apoptosis. Finally, as a proof-of-concept, we show that generic lipidic alkynylcarbinols can be devised to be bioactivated by other SDRs, including human RDH11 and HPGD/15-PGDH. Given that the SDR superfamily is one of the largest and most ubiquitous, this unique cytotoxic mechanism-of-action could be widely exploited to treat diseases, in particular cancer, through the design of tailored prodrugs. Graphical abstract
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Dates and versions

hal-03370122 , version 1 (07-10-2021)



Pascal Demange, Etienne Joly, Julien Marcoux, Patrick R A Zanon, Dymytrii Listunov, et al.. SDR enzymes oxidize specific lipidic alkynylcarbinols into cytotoxic protein-reactive species. 2021. ⟨hal-03370122⟩
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