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. 1993 Dec;67(12):7161–7171. doi: 10.1128/jvi.67.12.7161-7171.1993

Heterologous C-terminal sequences disrupt transcriptional activation and oncogenesis by p59v-rel.

J A Diehl 1, M Hannink 1
PMCID: PMC238178  PMID: 8230438

Abstract

Members of the NF-kappa B/rel family of transcription factors are regulated through a trans association with members of a family of inhibitor proteins, collectively known as I kappa B proteins, that contain five to eight copies of a 33-amino-acid repeat sequence (ankyrin repeat). Certain NF-kappa B/rel proteins are also regulated by cis-acting ankyrin repeat-containing domains. The C terminus of p105NF-kappa B, the precursor of the 50-kDa subunit of NF-kappa B, contains a series of ankyrin repeats; proteolytic removal of this ankyrin domain is necessary for the manifestation of sequence-specific DNA binding and nuclear translocation of the N-terminal product. To investigate the structural requirements important for regulation of different NF-kappa B/rel family members by polypeptides containing ankyrin repeat domains, we have constructed a p59v-rel:p105NF-kappa B chimeric protein (p110v-rel-ank). The presence of C-terminal p105NF-kappa B-derived sequences in p110v-rel-ank inhibited nuclear translocation, sequence-specific DNA binding, pp40I kappa B-alpha association, and oncogenic transformation. Sequential truncation of the C-terminal ankyrin domain of p110v-rel-ank resulted in the restoration of nuclear translocation, DNA binding, and pp40I kappa B-alpha association but did not restore the oncogenic properties of p59v-rel. The presence of 67 C-terminal p105NF-kappa B-derived amino acids was sufficient to inhibit both transcriptional activation and oncogenic transformation by p59v-rel. These results support a model in which activation of gene expression by p59v-rel is required for its ability to induce oncogenic transformation.

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Selected References

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