ACS Chemical Biology p. 755 - 762 (2016)
Update date:2022-08-17
Topics:
Langley, Gareth W.
Brink?, Anne
Münzel, Martin
Walport, Louise J.
Schofield, Christopher J.
Hopkinson, Richard J.
The dynamic post-translational modifications of histones play important roles in the regulation of transcription in animals. The demethylation of Nε-methyl lysine residues in the N-terminal tail of histone H3 is catalyzed by demethylases, of which the largest family is the ferrous iron and 2-oxoglutarate dependent demethylases (JmjC KDMs), which catalyze demethylation via initial hydroxylation of the N-methyl groups. We report studies on the conformational requirements of the JmjC KDM substrates using N-methylated lysine analogues prepared by metathesis reactions of suitably protected N-allylglycine. The results support the proposed requirement for a positively charged Nε-amino group in JmjC KDM catalysis. Demethylation of a trans-C-4/C-5 dehydrolysine substrate analogue was observed with representative KDM4 subfamily members KDM4A, KDM4B and KDM4E, and KDM7B, which are predicted, based on crystallographic analyses, to bind the Nε-methylated lysine residue in different conformations during catalysis. This information may be useful in the design of JmjC KDM selective inhibitors.
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