Linked Life Data

8414520

Source:http://linkedlifedata.com/resource/pubmed/id/8414520

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
11
pubmed:dateCreated
1993-11-24
pubmed:abstractText
Wild-type human p53 protein is able to self-associate and consists predominantly of homotetramers in solution. In earlier work we identified the protein sequence motifs involved in p53 quaternary structure and showed that while monomeric p53 protein retains tumour suppressor function, monomeric tumour mutant p53 lacks dominant transforming activity. In this report we use point mutated and truncated cDNA genes encoding self-association defective human p53 proteins to investigate the relationship between p53 protein quaternary structure and the associated activities of transcription transactivation and target specific DNA binding. We show that p53 binds to a target oligonucleotide as a protein homodimer and that p53 dimerisation is required for detectable DNA binding. We found no evidence for p53 tetramer: DNA complexes and we suggest that the quaternary structure status of p53 may regulate a DNA binding associated activity. Monomeric p53 proteins failed to bind DNA in these assays but exhibited increased transactivating activity. Thus, both transcription transactivation and tumour suppressor functions act independently of p53 protein self-association and DNA binding. We propose that our results validate the p53 dimerisation motif as a target for rational anticancer drug design. We predict that compounds able to block p53 dimer assembly would inhibit the dominant transforming activities of mutant p53 in tumours retaining expression of a mutant allele, while leaving intact the wild-type p53 associated activities of transcription transactivation and transformation suppression in unaffected tissue.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0950-9232
pubmed:author
pubmed:issnType
Print
pubmed:volume
8
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3165-73
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Human p53 binds DNA as a protein homodimer but monomeric variants retain full transcription transactivation activity.
pubmed:affiliation
Cell Proliferation Laboratory, Marie Curie Research Institute, Oxted, Surrey.
pubmed:publicationType
Journal Article