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Published in: Investigational New Drugs 5/2020

Open Access 01-10-2020 | PRECLINICAL STUDIES

Structure-based design, synthesis, and evaluation of the biological activity of novel phosphoroorganic small molecule IAP antagonists

Authors: Agnieszka Łupicka-Słowik, Mateusz Psurski, Renata Grzywa, Monika Cuprych, Jarosław Ciekot, Waldemar Goldeman, Elżbieta Wojaczyńska, Jacek Wojaczyński, Józef Oleksyszyn, Marcin Sieńczyk

Published in: Investigational New Drugs | Issue 5/2020

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Summary

One of the strategies employed by novel anticancer therapies is to put the process of apoptosis back on track by blocking the interaction between inhibitor of apoptosis proteins (IAPs) and caspases. The activity of caspases is modulated by the caspases themselves in a caspase/procaspase proteolytic cascade and by their interaction with IAPs. Caspases can be released from the inhibitory influence of IAPs by proapoptotic proteins such as secondary mitochondrial activator of caspases (Smac) that share an IAP binding motif (IBM). The main purpose of the present study was the design and synthesis of phosphorus-based peptidyl antagonists of IAPs that mimic the endogenous Smac protein, which blocks the interaction between IAPs and caspases. Based on the structure of the IAP antagonist and recently reported thiadiazole derivatives, we designed and evaluated the biochemical properties of a series of phosphonic peptides bearing the N-Me-Ala-Val/Chg-Pro-OH motif (Chg: cyclohexylglycine). The ability of the obtained compounds to interact with the binding groove of the X-linked inhibitor of apoptosis protein baculovirus inhibitor of apoptosis protein repeat (XIAP BIR3) domain was examined by a fluorescence polarization assay, while their potential to induce autoubiquitination followed by proteasomal degradation of cellular IAP1 was examined using the MDA-MB-231 breast cancer cell line. The highest potency against BIR3 was observed among peptides containing C-terminal phosphonic phenylalanine analogs, which displayed nanomolar Ki values. Their antiproliferative potential as well as their proapoptotic action, manifested by an increase in caspase-3 activity, was examined using various cell lines.
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Metadata
Title
Structure-based design, synthesis, and evaluation of the biological activity of novel phosphoroorganic small molecule IAP antagonists
Authors
Agnieszka Łupicka-Słowik
Mateusz Psurski
Renata Grzywa
Monika Cuprych
Jarosław Ciekot
Waldemar Goldeman
Elżbieta Wojaczyńska
Jacek Wojaczyński
Józef Oleksyszyn
Marcin Sieńczyk
Publication date
01-10-2020
Publisher
Springer US
Published in
Investigational New Drugs / Issue 5/2020
Print ISSN: 0167-6997
Electronic ISSN: 1573-0646
DOI
https://doi.org/10.1007/s10637-020-00923-4

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