Please use this identifier to cite or link to this item: doi:10.22028/D291-27494
Title: A π-Halogen Bond of Dibenzofuranones with the Gatekeeper Phe113 in Human Protein Kinase CK2 Leads to Potent Tight Binding Inhibitors
Author(s): Schnitzler, Alexander
Gratz, Andreas
Bollacke, Andre
Weyrich, Michael
Kuckländer, Uwe
Wünsch, Bernhard
Götz, Claudia
Niefind, Karsten
Jose, Joachim
Language: English
Title: Pharmaceuticals
Volume: 11
Issue: 1
Publisher/Platform: MDPI
Year of Publication: 2018
DDC notations: 610 Medicine and health
Publikation type: Journal Article
Abstract: Human protein kinase CK2 is an emerging target for neoplastic diseases. Potent lead structures for human CK2 inhibitors are derived from dibenzofuranones. Two new derivatives, 7,9-dichloro-1,2-dihydro-8-hydroxy-4-[(4-methoxyphenylamino)-methylene]dibenzo[b,d]furan-3(2H)-one (4a) and (E)-1,3-dichloro-6-[(4-methoxyphenylimino)-methyl]dibenzo[b,d]furan-2,7-diol (5) were tested for inhibition of CK2 and induction of apoptosis in LNCaP cells. Both turned out to be tight binding inhibitors, with IC50 values of 7 nM (4a) and 5 nM (5) and an apparent Ki value of 0.4 nM for both. Compounds 4a and 5 reduced cellular CK2 activity, indicating cell permeability. Cell viability was substantially impaired in LNCaP cells, as well as apoptosis was induced, which was not appearing in non-neoplastic ARPE-19 cells. Co-crystallization of 4a and 5 revealed an unexpected π-halogen bond of the chloro substituent at C9 with the gatekeeper amino acid Phe113, leading to an inverted binding mode in comparison to parent compound 4b, with the Cl at C6 instead, which was co-crystallized as a control. This indicates that the position of the chloro substituent on ring A of the dibenzofuran scaffold is responsible for an inversion of the binding mode that enhances potency.
DOI of the first publication: 10.3390/ph11010023
Link to this record: urn:nbn:de:bsz:291--ds-274949
hdl:20.500.11880/28602
http://dx.doi.org/10.22028/D291-27494
ISSN: 1424-8247
Date of registration: 17-Jan-2020
Faculty: M - Medizinische Fakultät
Department: M - Medizinische Biochemie und Molekularbiologie
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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