HTLV-I Tax protein stimulation of DNA binding of bZIP proteins by enhancing dimerization.
HTLV-I Tax protein stimulation of DNA binding of bZIP proteins by enhancing dimerization.
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HTLV-I Tax 蛋白通过增强二聚化来刺激 bZIP 蛋白的 DNA 结合。
DOI:
10.1126/science.8211160
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发表时间:
1993
期刊:
影响因子:
56.9
通讯作者:
M. Green
中科院分区:
文献类型:
--
作者:
S. Wagner;M. Green
The Tax protein of human T cell leukemia virus type-1 (HTLV-I) transcriptionally activates the HTLV-I promoter. This activation requires binding sites for activating transcription factor (ATF) proteins, a family of cellular proteins that contain basic region-leucine zipper (bZIP) DNA binding domains. Data are presented showing that Tax increases the in vitro DNA binding activity of multiple ATF proteins. Tax also stimulated DNA binding by other bZIP proteins, but did not affect DNA binding proteins that lack a bZIP domain. The increase in DNA binding occurred because Tax promotes dimerization of the bZIP domain in the absence of DNA, and the elevated concentration of the bZIP homodimer then facilitates the DNA binding reaction. These results help explain how Tax activates viral transcription and transforms cells.
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