6ftw
From Proteopedia
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== Function == | == Function == | ||
[[http://www.uniprot.org/uniprot/PDE4D_HUMAN PDE4D_HUMAN]] Hydrolyzes the second messenger cAMP, which is a key regulator of many important physiological processes.<ref>PMID:15260978</ref> <ref>PMID:15576036</ref> | [[http://www.uniprot.org/uniprot/PDE4D_HUMAN PDE4D_HUMAN]] Hydrolyzes the second messenger cAMP, which is a key regulator of many important physiological processes.<ref>PMID:15260978</ref> <ref>PMID:15576036</ref> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Several 3',5'-cyclic nucleotide phosphodiesterases (PDEs) have been validated as good drug targets for a large variety of diseases. Trypanosoma brucei PDEB1 (TbrPDEB1) has been designated as a promising drug target for the treatment of human African trypanosomiasis. Recently, the first class of selective nanomolar TbrPDEB1 inhibitors was obtained by targeting the parasite specific P-pocket. However, these biphenyl-substituted tetrahydrophthalazinone-based inhibitors did not show potent cellular activity against Trypanosoma brucei (T. brucei) parasites, leaving room for further optimization. Herein, we report the discovery of a new class of potent TbrPDEB1 inhibitors that display improved activities against T. brucei parasites. Exploring different linkers between the reported tetrahydrophthalazinone core scaffold and the amide tail group resulted in the discovery of alkynamide phthalazinones as new TbrPDEB1 inhibitors, which exhibit submicromolar activities versus T. brucei parasites and no cytotoxicity to human MRC-5 cells. Elucidation of the crystal structure of alkynamide 8b (NPD-048) bound to the catalytic domain of TbrPDEB1 shows a bidentate interaction with the key-residue Gln874 and good directionality towards the P-pocket. Incubation of trypanosomes with alkynamide 8b results in an increase of intracellular cAMP, validating a PDE-mediated effect in vitro and providing a new interesting compound series for further studies towards selective TbrPDEB1 inhibitors with potent phenotypic activity. | ||
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| + | Alkynamide phthalazinones as a new class of TbrPDEB1 inhibitors.,de Heuvel E, Singh AK, Edink E, van der Meer T, van der Woude M, Sadek P, Krell-Jorgensen MP, van den Bergh T, Veerman J, Caljon G, Kalejaiye TD, Wijtmans M, Maes L, de Koning HP, Jan Sterk G, Siderius M, de Esch IJP, Brown DG, Leurs R Bioorg Med Chem. 2019 Jun 18. pii: S0968-0896(18)31629-8. doi:, 10.1016/j.bmc.2019.06.027. PMID:31327675<ref>PMID:31327675</ref> | ||
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| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 6ftw" style="background-color:#fffaf0;"></div> | ||
== References == | == References == | ||
<references/> | <references/> | ||
Current revision
Crystal structure of human phosphodiesterase 4D2 catalytic domain with inhibitor NPD-048
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