Isolation of cDNAs for DNA-binding proteins which specifically bind to tax-responsive enhancer element in the long terminal repeat of human T-cell leukemia virus type I

A. Tsujimoto, H. Nyunoya, T. Morita, T. Sato, K. Shimotohno

研究成果: Article査読

93 被引用数 (Scopus)

抄録

One of the gene products of human T-cell leukemia virus type I (HTLV-I), p40(tax), activates its own viral transcription in trans through tax-responsive enhancers in viral long terminal repeats. Five species of cDNA clones for proteins that bind to the tax-responsive enhancer element in HTLV-1 were isolated from the Jurkat cell library. The β-galactosidase fusion protein prepared from the lysogen of a clone specifically recognized the cyclic AMP-responsive element in HTLV-I enhancer. The nucleotide sequence of a full-length cDNA clone (TAXREB67) had a coding capacity of 351 amino acids, which contained a basic motif followed by a leucine zipper structure near the carboxy terminus. Its mRNA was detected in human cell lines, including HTLV-1-infected or noninfected hematopoietic cell lines. The mRNA level in Jurkat cells was decreased temporarily by increasing cyclic AMP concentration hut increased by increasing Ca2+ concentration. Polyclonal antibodies against the fusion protein specifically recognized a 52-kDa protein in Jurkat cells. Analyses of the function of this protein and its interactions with other cellular factors will be useful to help understand the regulatory mechanism through tax-responsive enhancers in HTLV-I.

本文言語English
ページ(範囲)1420-1426
ページ数7
ジャーナルJournal of Virology
65
3
DOI
出版ステータスPublished - 1991
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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