The Ligand Binding Landscape of Diacylglycerol Kinases.

The Ligand Binding Landscape of Diacylglycerol Kinases.
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DOI:
10.1016/j.chembiol.2017.06.007
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发表时间:
2017-07-20
影响因子:
8.6
通讯作者:
Hsu KL
Hsu KL
中科院分区:
生物学1区
文献类型:
--
作者:
Franks CE;Campbell ST;Purow BW;Harris TE;Hsu KL

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Diacylglycerol kinases (DGKs) are integral components of signal transduction cascades that regulate cell biology through ATP-dependent phosphorylation of the lipid messenger diacylglycerol. Methods for direct evaluation of DGK activity in native biological systems are lacking and needed to study isoform-specific functions of these multidomain lipid kinases. Here, we utilize ATP acyl phosphate activity-based probes and quantitative mass spectrometry to define, for the first time, ATP- and small molecule-binding motifs of representative members from all five DGK subtypes. We use chemical proteomics to discover an unusual binding mode for the DGK-alpha (DGKα) inhibitor ritanserin, including interactions at the atypical C1 domain distinct from the ATP binding region. Unexpectedly, deconstruction of ritanserin yielded a fragment compound that blocks DGKα activity through a conserved binding mode and enhanced selectivity against the kinome. Collectively, our studies illustrate the power of chemical proteomics to profile protein-small molecule interactions of lipid kinases for fragment-based lead discovery. Franks et al. report the first chemical proteomic map of ligand binding sites of diacylglycerol kinases (DGKs) that reveals key molecular features that distinguish lipid and protein kinases to guide fragment-based discovery of DGK isoform-selective inhibitors.
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