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Mol. Cell. Biol., Mar 1996, 1203-1211, Vol 16, No. 3
Copyright © 1996, American Society for Microbiology

The recessive phenotype displayed by a dominant negative microphthalmia- associated transcription factor mutant is a result of impaired nucleation potential

K Takebayashi, K Chida, I Tsukamoto, E Morii, H Munakata, H Arnheiter, T Kuroki, Y Kitamura and S Nomura
Department of Pathology, Osaka University Medical School, Suita, Osaka, Japan.

In the DNA binding domain of microphthalmia-associated transcription factor (MITF), four mutations are reported: mi, Mi wh, mi ew, and mi or. MITFs encoded by the mi, Mi wh, mi ew, and Mi or mutant alleles (mi- MITF, Mi wh-MITF, Mi ew-MITF, and Mi or-MITF, respectively) interfered with the DNA binding of wild-type MITF, TFE3, and another basic helix- loop-helix leucine zipper protein in vitro. Polyclonal antibody against MITF was produced and used for investigating the subcellular localization of mutant MITFs. Immunocytochemistry and immunoblotting revealed that more than 99% of wild-type MITF and Mi wh-MITF located in nuclei of transfected NIH 3T3 and 293T cells. In contrast, mi-MITF predominantly located in the cytoplasm of cells transfected with the corresponding plasmid. When the immunoglobulin G (IgG)-conjugated peptides representing a part of the DNA binding domain containing mi and Mi wh mutations were microinjected into the cytoplasm of NRK49F cells, wild-type peptide and Mi wh-type peptide-IgG conjugate localized in nuclei but mi-type peptide-IgG conjugate was detectable only in the cytoplasm. It was also demonstrated that the nuclear translocation potential of Mi or-MITF was normal but that Mi ew-MITF was impaired as well as mi-MITF. In cotransfection assay, a strong dominant negative effect of Mi wh-MITF against wild-type MITF-dependent transactivation system on tyrosinase promoter was observed, but mi-MITF had a small effect. However, by the conjugation of simian virus 40 large-T-antigen- derived nuclear localization signal to mi-MITF, the dominant negative effect was enhanced. Furthermore, we demonstrated that the interaction between wild-type MITF and mi-MITF occurred in the cytoplasm and that mi-MITF had an inhibitory effect on nuclear localization potential of wild-type MITF.


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