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The acetyltransferases CBP and p300 are multifunctional transcriptional co-activators. Here, we combined quantitative proteomics with CBP/p300-specific catalytic inhibitors, bromodomain inhibitor, and gene knockout to reveal a comprehensive map of regulated acetylation sites and their dynamic turnover rates. CBP/p300 acetylates thousands of sites, including signature histone sites and a multitude...
The c-Myc oncoprotein (Myc) functions as a transcription regulator in association with an obligatory partner, Max, to control cell growth and differentiation. The Myc:Max complex regulates specific genes by recognizing “E-box” DNA sequences and promoter-bound factors such as Miz-1. Myc recruits histone acetyltransferases (HATs) to modify chromatin and is, itself, acetylated in mammalian cells by several...
Acetyltransferase enzymes target specific lysine residues in substrate proteins. While the list of histone and nonhistone substrates is growing, the mechanisms of substrate selection remain unclear. Here, we describe a mass spectrometric approach to examine the site selection of the acetyltransferase p300 in the HIV-1 protein Tat. Tat is acetylated by p300 at a single lysine (K50) within its basic...
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