I02-Macromolecular Crystallography
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Jan S.
Kramer
,
Stefano
Woltersdorf
,
Thomas
Duflot
,
Kerstin
Hiesinger
,
Felix F.
Lillich
,
Felix
Knöll
,
Sandra K.
Wittmann
,
Franca M.
Klingler
,
Steffen
Brunst
,
Apirat
Chaikuad
,
Christophe
Morisseau
,
Bruce D.
Hammock
,
Carola
Buccellati
,
Angelo
Sala
,
G. Enrico
Rovati
,
Matthieu
Leuillier
,
Sylvain
Fraineau
,
Julie
Rondeaux
,
Victor
Hernandez Olmos
,
Jan
Heering
,
Daniel
Merk
,
Denys
Pogoryelov
,
Dieter
Steinhilber
,
Stefan
Knapp
,
Jeremy
Bellien
,
Ewgenij
Proschak
Abstract: The emerging pharmacological target soluble epoxide hydrolase (sEH) is a bifunctional enzyme exhibiting two different catalytic activities, which are located in two distinct domains. Although the physiological role of the C-terminal hydrolase domain is well-investigated, little is known about its phosphatase activity located in the N-terminal domain of the sEH (sEH-P). Herein, we report the discovery and optimization of the first inhibitor of human and rat sEH-P, applicable in vivo. X-ray structure analysis of the sEH phosphatase domain complexed with an inhibitor provides insights in the molecular basis of small-molecule sEH-P inhibition and helps to rationalize the structure-activity relationships. 4-(4-(3,4-Dichlorophenyl)-5-phenyloxazol-2-yl)butanoic acid (22b, SWE101) has an excellent pharmacokinetic and pharmacodynamic profile in rats and enables the investigation of the physiological and pathophysiological role of sEH-P in vivo.
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Aug 2019
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I02-Macromolecular Crystallography
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Sven
Verdonck
,
Szu-yuan
Pu
,
Fiona J.
Sorrell
,
Jon M.
Elkins
,
Mathy
Froeyen
,
Ling-jie
Gao
,
Laura I.
Prugar
,
Danielle E.
Dorosky
,
Jennifer M.
Brannan
,
Rina
Barouch-bentov
,
Stefan
Knapp
,
John M.
Dye
,
Piet
Herdewijn
,
Shirit
Einav
,
Steven
De Jonghe
Diamond Proposal Number(s):
[10619]
Abstract: There are currently no approved drugs for the treatment of emerging viral infections, such as dengue and Ebola. Adaptor-associated kinase 1 (AAK1) is a cellular serine–threonine protein kinase that functions as a key regulator of the clathrin-associated host adaptor proteins and regulates the intracellular trafficking of multiple unrelated RNA viruses. Moreover, AAK1 is overexpressed specifically in dengue virus-infected but not bystander cells. Because AAK1 is a promising antiviral drug target, we have embarked on an optimization campaign of a previously identified 7-azaindole analogue, yielding novel pyrrolo[2,3-b]pyridines with high AAK1 affinity. The optimized compounds demonstrate improved activity against dengue virus both in vitro and in human primary dendritic cells and the unrelated Ebola virus. These findings demonstrate that targeting cellular AAK1 may represent a promising broad-spectrum antiviral strategy.
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May 2019
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I03-Macromolecular Crystallography
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Melissa
D'ascenzio
,
Kathryn M.
Pugh
,
Rebecca
Konietzny
,
Georgina
Berridge
,
Cynthia
Tallant
,
Shaima
Hashem
,
Octovia
Monteiro
,
Jason R.
Thomas
,
Markus
Schirle
,
Stefan
Knapp
,
Brian
Marsden
,
Oleg
Fedorov
,
Chas
Bountra
,
Benedikt M.
Kessler
,
Paul E.
Brennan
Diamond Proposal Number(s):
[10619]
Open Access
Abstract: Bromodomain‐containing proteins are epigenetic modulators involved in a wide range of cellular processes, from recruitment of transcription factors to pathological disruption of gene regulation and cancer development. Since the druggability of these acetyl‐lysine reader domains was established, efforts were made to develop potent and selective inhibitors across the entire family. Here we report the development of a small molecule‐based approach to covalently modify recombinant and endogenous bromodomain‐containing proteins by targeting a conserved lysine and a tyrosine residue in the variable ZA or BC loops. Moreover, the addition of a reporter tag allowed in‐gel visualization and pull‐down of the desired bromodomains.
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Jan 2019
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I02-Macromolecular Crystallography
I04-1-Macromolecular Crystallography (fixed wavelength)
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Václav
Němec
,
Michaela
Hylsová
,
Lukáš
Maier
,
Jana
Flegel
,
Sonja
Sievers
,
Slava
Ziegler
,
Martin
Schroeder
,
Benedict-tilman
Berger
,
Apirat
Chaikuad
,
Barbora
Valčíková
,
Stjepan
Uldrijan
,
Stanislav
Drápela
,
Karel
Souček
,
Herbert
Waldmann
,
Stefan
Knapp
,
Kamil
Paruch
Diamond Proposal Number(s):
[10619]
Abstract: Reported is the identification of the furo[3,2‐b]pyridine core as a novel scaffold for potent and highly selective inhibitors of cdc‐like kinases (CLKs) and efficient modulators of the Hedgehog signaling pathway. Initially, a diverse target compound set was prepared by synthetic sequences based on chemoselective metal‐mediated couplings, including assembly of the furo[3,2‐b]pyridine scaffold by copper‐mediated oxidative cyclization. Optimization of the subseries containing 3,5‐disubstituted furo[3,2‐b]pyridines afforded potent, cell‐active, and highly selective inhibitors of CLKs. Profiling of the kinase‐inactive subset of 3,5,7‐trisubstituted furo[3,2‐b]pyridines revealed sub‐micromolar modulators of the Hedgehog pathway.
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Dec 2018
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I04-Macromolecular Crystallography
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Diamond Proposal Number(s):
[105433]
Abstract: Lysine acetylation is an epigenetic mark that is principally recognized by bromodomains and recently structurally diverse YEATS domains also emerged as readers of lysine acetyl/acylations. Here we present a crystallography-based strategy and the discovery of fragments binding to the ENL YEATS domain, a potential drug target. Crystal structures combined with synthetic efforts led to the identification of a sub-micromolar binder, providing first starting points for the development of chemical probes for this reader domain family.
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Nov 2018
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Moses
Moustakim
,
Thomas
Christott
,
Octovia P.
Monteiro
,
James
Bennett
,
Charline
Giroud
,
Jennifer
Ward
,
Catherine M.
Rogers
,
Paul
Smith
,
Ioanna
Panagakou
,
Laura
Diaz-saez
,
Suet Ling
Felce
,
Vicki
Gamble
,
Carina
Gileadi
,
Nadia
Halidi
,
David
Heidenreich
,
Apirat
Chaikuad
,
Stefan
Knapp
,
Kilian V. M.
Huber
,
Gillian
Farnie
,
Jag
Heer
,
Nenad
Manevski
,
Gennady
Poda
,
Rima
Al-awar
,
Darren J.
Dixon
,
Paul E.
Brennan
,
Oleg
Fedorov
Abstract: YEATS domain (YD) containing proteins are an emerging class of epigenetic targets in drug discovery. Dysregulation of these modified lysine‐binding proteins has been linked to the onset and progression of cancers. We herein report the discovery and characterisation of the first small‐molecule chemical probe, SGC‐iMLLT, for the YD of MLLT1 (ENL/YEATS1) and MLLT3 (AF9/YEATS3). SGC‐iMLLT is a potent and selective inhibitor of MLLT1/3–histone interactions. Excellent selectivity over other human YD proteins (YEATS2/4) and bromodomains was observed. Furthermore, our probe displays cellular target engagement of MLLT1 and MLLT3. The first small‐molecule X‐ray co‐crystal structures with the MLLT1 YD are also reported. This first‐in‐class probe molecule can be used to understand MLLT1/3‐associated biology and the therapeutic potential of small‐molecule YD inhibitors.
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Oct 2018
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I02-Macromolecular Crystallography
I03-Macromolecular Crystallography
I04-Macromolecular Crystallography
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Diamond Proposal Number(s):
[8421]
Open Access
Abstract: Cdc2-like kinases (CLKs) represent a family of serine-threonine kinases involved in the regulation of splicing by phosphorylation of SR-proteins and other splicing factors. Although compounds acting against CLKs have been described, only a few show selectivity against dual-specificity tyrosine phosphorylation regulated-kinases (DYRKs). We here report a novel CLK inhibitor family based on a 6,7-dihydropyrrolo[3,4-g]indol-8(1H)-one core scaffold. Within the series, 3-(3-chlorophenyl)-6,7-dihydropyrrolo[3,4-g]indol-8(1H)-one (KuWal151) was identified as inhibitor of CLK1, CLK2 and CLK4 with a high selectivity margin towards DYRK kinases. The compound displayed a potent antiproliferative activity in an array of cultured cancer cell lines. The X-ray structure analyses of three members of the new compound class co-crystallized with CLK proteins corroborated a molecular binding mode predicted by docking studies.
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May 2018
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I03-Macromolecular Crystallography
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Michael
Forster
,
Apirat
Chaikuad
,
Teodor
Dimitrov
,
Eva
Döring
,
Julia
Holstein
,
Benedict-tilman
Berger
,
Matthias
Gehringer
,
Kamran
Ghoreschi
,
Susanne
Müller
,
Stefan
Knapp
,
Stefan A.
Laufer
Diamond Proposal Number(s):
[10619]
Abstract: Janus kinases are major drivers of immune signaling and have been the focus of anti-inflammatory drug discovery for more than a decade. Because of the invariable co-localization of JAK1 and JAK3 at cytokine receptors, the question if selective JAK3 inhibition is sufficient to effectively block downstream signaling has been highly controversial. Recently, we discovered the covalent-reversible JAK3 inhibitor FM-381 (23) featuring high isoform and kinome selectivity. Crystallography revealed that this inhibitor induces an unprecedented binding pocket by interactions of a nitrile substituent with arginine residues in JAK3. Herein we describe detailed structure activity relationships necessary for induction of the arginine pocket and the impact of this structural change on potency, isoform selectivity and efficacy in cellular models. Furthermore, we evaluated the stability of this novel inhibitor class in in vitro metabolic assays and were able to demonstrate an adequate stability of key compound 23 for in vivo use.
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May 2018
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Moses
Moustakim
,
Kerstin
Riedel
,
Marion
Schuller
,
Andrè P.
Gehring
,
Octovia P.
Monteiro
,
Sarah P.
Martin
,
Oleg
Fedorov
,
Jag
Heer
,
Darren J.
Dixon
,
Jonathan M.
Elkins
,
Stefan
Knapp
,
Franz
Bracher
,
Paul E.
Brennan
Abstract: The polyadenosine-diphosphate-ribose polymerase 14 (PARP14) has been implicated in DNA damage response pathways for homologous recombination. PARP14 contains three (ADP ribose binding) macrodomains (MD) whose exact contribution to overall PARP14 function in pathology remains unclear. A medium throughput screen led to the identification of N-(2(-9H-carbazol-1-yl)phenyl)acetamide (GeA-69, 1) as a novel allosteric PARP14 MD2 (second MD of PARP14) inhibitor. We herein report medicinal chemistry around this novel chemotype to afford a sub-micromolar PARP14 MD2 inhibitor. This chemical series provides a novel starting point for further development of PARP14 chemical probes.
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Mar 2018
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I04-1-Macromolecular Crystallography (fixed wavelength)
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Abstract: Epigenetics is of rapidly growing field in drug discovery. Of particular interest is the role of post‐translational modifications to histone and the proteins that read, write, and erase such modifications. The development of inhibitors for reader domains has focused on single domains. One of the major difficulties of designing inhibitors for reader domains, is that with the notable exception of bromodomains, they tend not to possess a well enclosed binding site amenable to small molecule inhibition. As many of the proteins in epigenetic regulation have multiple domains there are opportunities for designing inhibitors that bind at a domain‐domain interface which provide a more suitable interaction pocket. Examination of X‐ray structures of multiple domains involved in recognizing and modifying post‐translational histone marks using the SiteMap algorithm identified potential binding sites at domain‐domain interfaces. For the tandem plant homeodomain‐bromodomain of SP100C, a potential inter‐domain site identified computationally was validated experimentally by the discovery of ligands by X‐ray crystallographic fragment screening.
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Mar 2018
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