Abstract
Covalent modification of the promyelocytic leukaemia protein (PML) by SUMO-1 is a prerequisite for the assembly of nuclear bodies (NBs), subnuclear structures disrupted in various human diseases and linked to transcriptional and growth control. Here we demonstrate that p53 is recruited into NBs by a specific PML isoform (PML3) or by coexpression of SUMO-1 and hUbc9. NB targeting depends on the direct association of p53, through its core domain, with a C-terminal region of PML3. The relocalization of p53 into NBs enhances p53 transactivation in a promoter-specific manner and affects cell survival. Our results indicate the existence of a cross-talk between PML- and p53-dependent growth suppression pathways, implying an important role for NBs and their resident proteins as modulators of p53 functions.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Biological Transport, Active
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Cell Nucleus / metabolism
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Cell Survival
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Humans
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Ligases / genetics
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Ligases / metabolism
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Neoplasm Proteins / genetics
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Neoplasm Proteins / metabolism*
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Nuclear Proteins*
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Promyelocytic Leukemia Protein
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Protein Binding
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Protein Isoforms / genetics
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Protein Isoforms / metabolism
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SUMO-1 Protein
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Transcription Factors / genetics
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Transcription Factors / metabolism*
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Transcription, Genetic
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Tumor Cells, Cultured
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Tumor Suppressor Protein p53 / genetics
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Tumor Suppressor Protein p53 / metabolism*
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Tumor Suppressor Proteins
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Ubiquitin-Conjugating Enzymes*
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Ubiquitins / genetics
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Ubiquitins / metabolism
Substances
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Neoplasm Proteins
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Nuclear Proteins
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Promyelocytic Leukemia Protein
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Protein Isoforms
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SUMO-1 Protein
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Transcription Factors
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Tumor Suppressor Protein p53
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Tumor Suppressor Proteins
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Ubiquitins
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PML protein, human
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Ubiquitin-Conjugating Enzymes
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Ligases
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ubiquitin-conjugating enzyme UBC9