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Structural basis for G9a-like protein lysine methyltransferase inhibition by BIX-01294
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Structural basis for G9a-like protein lysine methyltransferase inhibition by BIX-01294
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Journal Article
Structural basis for G9a-like protein lysine methyltransferase inhibition by BIX-01294
2009
Overview
The G9a-like lysine methyltransferases can be inhibited by the small molecule BIX-01294, recently identified through a chemical screen and shown to be capable of replacing Oct3/4. The structure of GLP in complex with BIX-01294 indicates an overlap with the known position of histone peptide binding, and further work indicates that the drug inhibits methylation of DNMT1, indicating that it is enzyme specific but non specific with regard to substrate.
Histone lysine methylation is an important epigenetic mark that regulates gene expression and chromatin organization. G9a and G9a-like protein (GLP) are euchromatin-associated methyltransferases that repress transcription by methylating histone H3 Lys9. BIX-01294 was originally identified as a G9a inhibitor during a chemical library screen of small molecules and has previously been used in the generation of induced pluripotent stem cells. Here we present the crystal structure of the catalytic SET domain of GLP in complex with BIX-01294 and
S
-adenosyl-
L
-homocysteine. The inhibitor is bound in the substrate peptide groove at the location where the histone H3 residues N-terminal to the target lysine lie in the previously solved structure of the complex with histone peptide. The inhibitor resembles the bound conformation of histone H3 Lys4 to Arg8, and is positioned in place by residues specific for G9a and GLP through specific interactions.
Publisher
Nature Publishing Group US,Nature Publishing Group
Subject
/ Biomedical and Life Sciences
/ Enzyme Inhibitors - chemistry
/ Enzyme Inhibitors - pharmacology
/ GENES
/ Histone-Lysine N-Methyltransferase - antagonists & inhibitors
/ Histone-Lysine N-Methyltransferase - chemistry
/ HISTONES
/ LYSINE
/ PEPTIDES
/ PROTEINS
/ RESIDUES
/ S-Adenosylhomocysteine - chemistry
/ SCREENS
/ TARGETS
