Abstract
Human EMCs (extraskeletal myxoid chondrosarcomas) are soft tissue tumours characterized by specific chromosomal abnormalities. Recently, a proportion of EMCs were found to harbour a characteristic translocation, t(3;9)(q11-12;q22), involving the TFG (TRK-fused gene) at 3q11-12 and the TEC (translocated in extraskeletal chondrosarcoma) gene at 9q22. The present study used both in vitro and in vivo systems to show that the TFG-TEC protein self-associates, and that this is dependent upon the CC (coiled-coil) domain (amino acids 97-124), the AF1 (activation function 1) domain (amino acids 275-562) and the DBD (DNA-binding domain) (amino acids 563-655). The TFG-TEC protein also associated with a mutant NLS-TFG-TEC (AAAA) protein, which harbours mutations in the NLS (nuclear localization signal). Subcellular localization assays showed that the NLS mutant TFG-TEC (AAAA) protein interfered with the nuclear localization of wild-type TFG-TEC. Most importantly, the mutant protein inhibited TFG-TEC-mediated transcriptional activation in vivo. Thus mutations in the TFG-TEC NLS yield a dominant-negative protein. These results show that the biological functions of the TFG-TEC oncogene can be modulated by a dominant-negative mutant.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Active Transport, Cell Nucleus / genetics
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Cell Nucleus* / genetics
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Cell Nucleus* / metabolism
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Cell Nucleus* / pathology
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Chondrosarcoma* / genetics
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Chondrosarcoma* / metabolism
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Chondrosarcoma* / pathology
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DNA-Binding Proteins* / genetics
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DNA-Binding Proteins* / metabolism
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HEK293 Cells
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Humans
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Multiprotein Complexes / genetics
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Multiprotein Complexes / metabolism
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Mutation*
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Neoplasms, Connective and Soft Tissue* / genetics
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Neoplasms, Connective and Soft Tissue* / metabolism
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Neoplasms, Connective and Soft Tissue* / pathology
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Nuclear Localization Signals* / genetics
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Nuclear Localization Signals* / metabolism
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Oncogene Proteins, Fusion* / immunology
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Oncogene Proteins, Fusion* / metabolism
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Proteins* / genetics
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Proteins* / metabolism
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Receptors, Steroid* / genetics
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Receptors, Steroid* / metabolism
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Receptors, Thyroid Hormone* / genetics
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Receptors, Thyroid Hormone* / metabolism
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Transcription, Genetic / genetics*
Substances
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DNA-Binding Proteins
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Multiprotein Complexes
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NR4A3 protein, human
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Nuclear Localization Signals
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Oncogene Proteins, Fusion
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Proteins
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Receptors, Steroid
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Receptors, Thyroid Hormone
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TFG protein, human
Supplementary concepts
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Chondrosarcoma, Extraskeletal Myxoid