title: c-Abl acetylation by histone acetyltransferases regulates its nuclear-cytoplasmic localization.
abstract: c-Abl function is strictly dependent on its subcellular localization. Using an in vitro approach, we identify c-Abl as a new substrate for p300, CBP (CREB-binding protein) and PCAF (p300/CBP-associated factor) histone acetyltransferases. Remarkably, acetylation markedly alters its subcellular localization. Point mutagenesis indicated that Lys 730, located in the second nuclear localization signal, is the main target of p300 activity. It has previously been reported that c-Abl accumulates in the cytoplasm during myogenic differentiation. Here, we show that c-Abl protein is acetylated at early stages of myogenic differentiation. Indeed, acetylation on Lys 730 drives c-Abl accumulation in the cytoplasm and promotes differentiation. Thus, Lys 730 acetylation is a novel post-translational modification of c-Abl and a novel mechanism for modulating its subcellular localization that contributes to myogenic differentiation.
authors.affiliation: Dulbecco Telethon Institute, Via Montpellier 1, 00133 Rome, Italy.
authors.forename: Maria Giovanna
authors.initials: MG
authors.lastname: di Bari
authors.forename: Laura
authors.initials: L
authors.lastname: Ciuffini
authors.forename: Michele
authors.initials: M
authors.lastname: Mingardi
authors.forename: Roberto
authors.initials: R
authors.lastname: Testi
authors.forename: Silvia
authors.initials: S
authors.lastname: Soddu
authors.forename: Daniela
authors.initials: D
authors.lastname: Barilà
mesh_terms: D000107:Acetylation; D000595:Amino Acid Sequence; D000818:Animals; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D051548:Histone Acetyltransferases / Q000378:metabolism*; D006801:Humans; D008239:Lysine / Q000737:chemistry; D051379:Mice; D008969:Molecular Sequence Data; D024510:Muscle Development; D019913:Nuclear Localization Signals / Q000737:chemistry / Q000235:genetics; D011499:Protein Processing, Post-Translational; D016315:Proto-Oncogene Proteins c-abl / Q000737:chemistry / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D014162:Transfection; D050880:p300-CBP Transcription Factors / Q000378:metabolism
chemical_list: D019913:Nuclear Localization Signals; D011994:Recombinant Proteins; D051548:Histone Acetyltransferases; D050880:p300-CBP Transcription Factors; D016315:Proto-Oncogene Proteins c-abl; D008239:Lysine