MG 149 (Synonyms: Tip60 HAT inhibitor)

Binding assays

Radioisotope-labeled acetyltransferase assays were carried out at 30°C in a reaction volume of 30 μL. The reaction buffer contained 50 mM HEPES at pH 8.0, 0.1 mM EDTA, 50 μg/mL BSA, 1 mM dithiothreitol, 0.1% Triton-X100, and 2% DMSO. 14C-labeled Ac-CoA was used as the acetyl donor. The peptide containing the N-terminal 20-amino acid sequence of histone H4 (i.e. H4-20) was used as substrate for p300 and Tip60, and the peptide containing the N-terminal 20-amino acid sequence of histone H3 (i.e. H3-20) was employed as substrate for PCAF. The HAT reaction was initiated with the HAT enzyme after the other components (Ac-CoA, peptide substrate, and the inhibitor) were equilibrated at 30°C for 5 min. After the reaction, the mixture was loaded onto a Waterman P81 filter paper and then washed with 50 mM sodium bicarbonate (pH 9.0) for three times. The paper was air dried and the amount of radioactivity incorporated into the peptide substrate was quantified by liquid scintillation counting.

Cell lines

HeLa cells

Preparation method

The solubility of this compound in DMSO is > 10 mM. General tips for obtaining a higher concentration: Please warm the tube at 37℃ for 10 minutes and/or shake it in the ultrasonic bath for a while. Stock solution can be stored below -20℃ for several months.

Applications

MG 149 inhibited the activity of HAT in nuclear extracts from HeLa cells using biotinylated histone H3 or histone H4 peptides as substrates.

Other notes

Please test the solubility of all compounds indoor, and the actual solubility may slightly differ with the theoretical value. This is caused by an experimental system error and it is normal.

References:

[1]. Ghizzoni M, Wu J, Gao T, Haisma HJ, Dekker FJ, George Zheng Y. 6-alkylsalicylates are selective Tip60 inhibitors and target the acetyl-CoA binding site. Eur J Med Chem. 2012 Jan;47(1):337-44.