NDLI: Cytoplasmically sequestered wild-type p53 protein in neuroblastoma is relocated to the nucleus by a C-terminal peptide

Content Provider	PubMed Central
Author	Ostermeyer, Anne g. Erik, Runko Winkfield, Blonka Ahn, Brand Moll, Ute m.
Copyright Year	1996
Abstract	Cytoplasmic sequestration of wild-type p53 protein occurs in a subset of primary human tumors including breast cancer, colon cancer, and neuroblastoma (NB). The sequestered p53 localizes to punctate cytoplasmic structures that represent large protein aggregates. One functional consequence of this blocked nuclear access is impairment of the p53-mediated G1 checkpoint after DNA damage. Here we show that cytoplasmic p53 from NB cells is incompetent for specific DNA binding, probably due to its sequestration. Importantly, the C-terminal domain of sequestered p53 is masked, as indicated by the failure of a C-terminally directed antibody to detect p53 in these structures. To determine (i) which domain of p53 is involved in the aggregation and (ii) whether this phenotype is potentially reversible, we generated stable NB sublines that coexpress the soluble C-terminal mouse p53 peptide DD1 (amino acids 302–390). A dramatic phenotypic reversion occurred in five of five lines. The presence of DD1 blocked the sequestration of wild-type p53 and relocated it to the nucleus, where it accumulated. The nuclear translocation is due to shuttling of wild-type p53 by heteroligomerization to DD1, as shown by coimmunoprecipitation. As expected, the nuclear heterocomplexes were functionally inactive, since DD1 is a dominant negative inhibitor of wild-type p53. In summary, we show that nuclear access of p53 can be restored in NB cells.
Starting Page	15190
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	26
Volume Number	93
Language	English
Publisher	The National Academy of Sciences of the USA
Publisher Date	1996-12-24
Access Restriction	Open
Rights Holder	The National Academy of Sciences of the USA
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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