Loss of responsiveness of an AP1-related factor, PEBP1, to 12-O-tetradecanoylphorbol-13-acetate after transformation of NIH 3T3 cells by the Ha-ras oncogene

M. Satake, T. Ibaraki, Y. Yamaguchi, Y. Ito

研究成果: Article査読

17 被引用数 (Scopus)

抄録

The function of the A element (nucleotides 5107 to 5130) of the polyomavirus enhancer is augumented in NIH 3T3 cells by a tumor-promoting phorbol ester, 12-O-tetradecanoylphorbol-13-acetate (TPA). One of its targets is an AP1 consensus sequence motif recognized by a nuclear factor, PEBP1. In Ha-ras-transformed NIH 3T3 cells, however, A element function was not enhanced by TPA treatment, and at the same time PEBP1 was not detected in the nuclear extract by a mobility shift assay. PEBP1 was not detected in either the extract from NIH 3T3 cells treated in vivo with a protein kinase inhibitor, staurosporine, or the extract from NIH 3T3 cells after treatment in vitro with phosphatase. These results suggest that PEBP1 is required to be properly phosphorylated for DNA binding and that it is underphosphorylated, possibly due to the downregulation of protein kinase C in Ha-ras-transformed cells. In addition, we observed that PEBP2, which bound to the A element adjacent to PEBP1, was converted to apparently related PEBP3 when conditions favored underphosphorylation.

本文言語English
ページ(範囲)3669-3677
ページ数9
ジャーナルJournal of virology
63
9
DOI
出版ステータスPublished - 1989
外部発表はい

ASJC Scopus subject areas

  • 微生物学
  • 免疫学
  • 昆虫科学
  • ウイルス学

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