title: Six lysine residues on c-Myc are direct substrates for acetylation by p300.
abstract: 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 of these HATs including p300/CBP, GCN5, and Tip60. The Myc residues that are directly modified by these different HATs remain unknown. Here, we have analyzed the acetylation of recombinant Myc:Max complexes by purified p300 HAT in vitro by using MALDI-TOF and LC-ESI-MS/MS mass spectrometry. These analyses identify six lysine residues in human Myc (K143, K157, K275, K317, K323, and K371) as direct substrates for p300. Our results further indicate that p300 can acetylate DNA-bound Myc:Max complexes and that acetylated Myc:Max heterodimers efficiently interact with Miz-1.
authors.affiliation: Department of Chemistry, University of California at Riverside, Riverside, CA 92521, USA.
authors.forename: Kangling
authors.initials: K
authors.lastname: Zhang
authors.forename: Francesco
authors.initials: F
authors.lastname: Faiola
authors.forename: Ernest
authors.initials: E
authors.lastname: Martinez
mesh_terms: D000107:Acetylation; D000595:Amino Acid Sequence; D004247:DNA / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism; D006801:Humans; D051741:Kruppel-Like Transcription Factors; D008239:Lysine / Q000378:metabolism*; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000378:metabolism*; D011485:Protein Binding; D016271:Proto-Oncogene Proteins c-myc / Q000737:chemistry / Q000378:metabolism*; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D021241:Spectrometry, Mass, Electrospray Ionization; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors
chemical_list: D004268:DNA-Binding Proteins; D051741:Kruppel-Like Transcription Factors; D009687:Nuclear Proteins; D016271:Proto-Oncogene Proteins c-myc; D011994:Recombinant Proteins; D015534:Trans-Activators; D014157:Transcription Factors; C107961:ZBTB17 protein, human; D004247:DNA; D008239:Lysine