Accessing protein methyltransferase and demethylase enzymology using microfluidic capillary electrophoresis.

Accessing protein methyltransferase and demethylase enzymology using microfluidic capillary electrophoresis.
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DOI:
10.1016/j.chembiol.2010.04.014
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发表时间:
2010-07-30
影响因子:
--
通讯作者:
Janzen WP
Janzen WP
中科院分区:
生物1区
文献类型:
--
作者:
Wigle TJ;Provencher LM;Norris JL;Jin J;Brown PJ;Frye SV;Janzen WP

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The discovery of small molecules targeting the > 80 enzymes that add (methyltransferases) or remove (demethylases) methyl marks from lysine and arginine residues, most notably present in histone tails, may yield unprecedented chemotherapeutic agents and facilitate regenerative medicine. To better enable chemical exploration of these proteins, we have developed a novel and highly quantitative microfluidic capillary electrophoresis assay to enable full mechanistic studies of these enzymes and the kinetics of their inhibition. This technology separates small biomolecules, i.e., peptides, based on their charge-to-mass ratio. Methylation, however, does not alter the charge of peptide substrates. To overcome this limitation, we have employed a methylation-sensitive endoproteinase strategy to separate methylated from unmethylated peptides. The assay was validated on a lysine methyltransferase (G9a) and a lysine demethylase (LSD1) and was employed to investigate the inhibition of G9a by small molecules.
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