Synthesis and analysis of potential prodrugs of coenzyme A analogues for the inhibition of the histone acetyltransferase p300
UMass Chan AffiliationsDepartment of Biochemistry and Molecular Pharmacology
Enzymes and Coenzymes
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AbstractLys-CoA (1) is a selective inhibitor of p300 histone acetyltransferase (HAT) but shows poor pharmacokinetic properties because of its multiply charged phosphates. In an effort to overcome this limitation, truncated derivatives of 1 were designed, synthesized and tested as p300HAT inhibitors as well as substrates for the CoA biosynthetic bifunctional enzyme phosphopantetheine adenylyltransferase-dephospho-CoA kinase (PPAT/DPCK). Lys-pantetheine (3) and Lys-phosphopantetheine (2) showed no detectable p300HAT inhibition whereas 3'-dephospho-Lys-CoA (5) was a modest p300 inhibitor with IC(50) of 1.6 microM (compared to IC(50) of approximately 50 nM for 1 blocking p300). Compound 2 was shown to be an efficient substrate for PPAT whereas 5 was a very poor DPCK substrate. Further analysis with 3'-dephospho-Me-SCoA (7) indicated that DPCK shows relatively narrow capacity to accept substrates with sulfur substitution. While these results suggest that truncated derivatives of 1 will be of limited value as lead agents for p300 blockade in vivo, they augur well for prodrug versions of CoA analogues that do not require 3'-phosphate substitution for efficient binding to their targets, such as the GCN-5 related N-acetyltransferases.
SourceBioorg Med Chem. 2003 Jul 31;11(15):3307-13. doi:10.1016/S0968-0896(03)00265-7
Permanent Link to this Itemhttp://hdl.handle.net/20.500.14038/50081
At the time of publication, Paul Thompson was not yet affiliated with UMass Medical School.
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