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Studies on the interaction of the histone demethylase KDM5B with tricarboxylic acid cycle intermediates

DOI: 10.1016/j.jmb.2017.08.007 DOI Help

Authors: Hanna Tarhonskaya (University of Oxford) , Radoslaw P. Nowak (Structural Genomics Consortium, University of Oxford) , Catrine Johansson (Structural Genomics Consortium, University of Oxford) , Aleksandra Szykowska (Structural Genomics Consortium, University of Oxford) , Anthony Tumber (Structural Genomics Consortium, University of Oxford) , Rebecca L. Hancock (University of Oxford) , Pauline Lang (University of Oxford) , Emily Flashman (University of Oxford) , Udo Oppermann (Structural Genomic Consortium, University of Oxford) , Christopher J. Schofield (University of Oxford) , Akane Kawamura (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Molecular Biology

State: Published (Approved)
Published: August 2017
Diamond Proposal Number(s): 11175 , 10619

Open Access Open Access

Abstract: Methylation of lysine-4 of histone H3 (H3K4men) is an important regulatory factor in eukaryotic transcription. Removal of the transcriptionally activating H3K4 methylation is catalysed by histone demethylases, including the JmjC KDM5 subfamily. The JmjC KDMs are Fe(II) and 2-oxoglutarate (2OG) dependent oxygenases, some of which are associated with cancer. Altered levels of TCA cycle intermediates, and the associated metabolites D- and L-2-hydroxyglutarate (2HG), can cause changes in chromatin methylation status. We report comprehensive biochemical, structural and cellular studies on the interaction of TCA cycle intermediates with KDM5B which is a current medicinal chemistry target for cancer. The tested TCA intermediates were poor or moderate KDM5B inhibitors, except for oxaloacetate and succinate, which were shown to compete for binding with 2OG. D- and L-2HG were moderately potent inhibitors at levels which might be relevant in cancer cells bearing isocitrate dehydrogenase mutations. Crystallographic analyses with succinate, fumarate, L-malate, oxaloacetate, pyruvate, D- and L-2HG support the kinetic studies showing competition with 2OG. An unexpected binding mode for oxaloacetate was observed in which it coordinates the active site metal via its C-4 carboxylate rather than the C-1 carboxylate/C-2 keto groups. Studies employing immunofluorescence antibody-based assays reveal no changes in H3K4me3 levels in cells ectopically overexpressing KDM5B in response to dosing with TCA cycle metabolite pro-drug esters, suggesting that the high levels of cellular 2OG may preclude inhibition. The combined results reveal the potential for KDM5B inhibition by TCA cycle intermediates, but suggest that in cells such inhibition will normally be effectively competed by 2OG.

Journal Keywords: Epigenetics; lysine JmjC demethylase; 2-oxoglutarate oxygenase; histone modification; TCA cycle inhibition; KDM5B; JARID1B

Diamond Keywords: Epigenetics; Enzymes

Subject Areas: Chemistry, Biology and Bio-materials, Medicine

Instruments: I02-Macromolecular Crystallography , I04-1-Macromolecular Crystallography (fixed wavelength) , I04-Macromolecular Crystallography

Added On: 23/08/2017 09:54


Discipline Tags:

Non-Communicable Diseases Health & Wellbeing Cancer Biochemistry Genetics Chemistry Structural biology Drug Discovery Life Sciences & Biotech

Technical Tags:

Diffraction Macromolecular Crystallography (MX)