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The tumor-suppressor gene p53 is altered by missense mutation in numerous human malignancies. However, the biochemical properties of p53 and the effect of mutation on these properties are unclear. A human DNA sequence was identified that binds specifically to wild-type human p53 protein in vitro. As few as 33 base pairs were sufficient to confer specific(More)
Damage to the normal replacing tissues of the body, specifically the gastro-intestinal tract, limits the treatment and hence, cure rate of cancer patients. Here, we investigate the possibility that the sensitivity of the gastro-intestinal tract can be manipulated by transforming growth factor beta3 (TGF-beta3), making it more resistant to radiation in a(More)
The properties of several cDNA clones representing a family of mRNAs found in the embryonic ectoderm of Strongylocentrotus purpuratus are described. We have previously shown that these mRNAs (termed Spec for Strongylocentrotus purpuratus ectoderm) accumulate in the presumptive dorsal ectoderm of post-cleavage stage embryos and code for a group of 10 to 12(More)
The Bax gene is a member of the Bcl2 family that functions to regulate the programmed cell death process. A number of Bax isoforms have been previously identified: alpha, beta, gamma, delta, and omega. Here we report the identification and characterization of an additional Bax variant, termed Baxepsilon. The newly identified Bax variant contains a 97-base(More)
Spec 1 mRNAs increase 100-fold in abundance per embryo during early sea urchin development. Previous studies indicated an enrichment of this mRNA in ectoderm fractions of gastrulae and plutei. We have determined the precise localization of this mRNA by in situ hybridization techniques. In pluteus larvae, the mRNA is highly restricted to a set of(More)
Herbimycin A, a benzoquinoid ansamycin, is widely used as an inhibitor of tyrosine kinases. We have examined the effects of herbimycin A and several analogues on p185, the tyrosine kinase encoded by the erbB2 gene in human breast cancer cells. Exposure to 0.35 microM herbimycin A reduced tyrosine phosphorylation of p185 in SKBr3 cells by 80% after 2 h, and(More)
The inactivation of growth suppressor genes appears to play a major role in the malignant process. To assess whether protein phosphotyrosyl phosphatases (protein-tyrosine-phosphate phosphohydrolase, EC 3.1.3.48) function as growth suppressors, we have isolated a cDNA clone encoding human protein phosphotyrosyl phosphatase 1B for structural and functional(More)
Retinoid X receptors (RXRs) are members of the steroid and thyroid hormone receptor superfamily of hormone-dependent transcription factors that mediate the pleiotropic effect of retinoids. Here, we report the initial characterization of an isoform of hRXR beta, termed hRXR beta3, which was previously identified as an H-2RIIBP isoform (Epplen and Epplen,(More)
Many oncogenes encode proteins with a tyrosine kinase activity that appears to be directly involved in the process of transformation. Because these kinases are themselves activated for transformation by tyrosine phosphorylation, proteins which remove phosphate from tyrosine residues, protein tyrosine phosphatases (also termed phosphotyrosine phosphatases(More)