The HIV-1 Tat cellular coactivator Tat-SF1 is a general transcription elongation factor

The HIV-1 Tat cellular coactivator Tat-SF1 is a general transcription elongation factor
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DOI:
10.1101/gad.12.19.2992
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发表时间:
1998-10-01
影响因子:
10.5
通讯作者:
Green, MR
Green, MR
中科院分区:
生物学1区
文献类型:
--
作者:
Li, XY;Green, MR

文献摘要

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人类免疫缺陷病毒1型(HIV-1)达特蛋白强烈且特异性地刺激HIV-1 LTR的转录延伸,并提供了研究该过程的重要体外模型系统。在这里,我们使用蛋白质亲和层析,以确定参与转录延伸的细胞因子。一个Tat亲和柱结合一个转录因子,Tat-SF 1,有效和选择性。Tat-SF 1最初被鉴定为Tat特异性共激活因子,但我们发现它是一个通用的转录延伸因子。我们的研究结果还揭示了存在一个ATP失活的一般延伸因子(AIEF)所需的Tat-SF 1的活动和达特可以取代功能。
The human immunodeficiency virus type 1 (HIV-1) Tat protein strongly and specifically stimulates transcription elongation from the HIV-1 LTR and provides an important in vitro model system to study this process. Here we use protein-affinity chromatography to identify cellular factors involved in transcription elongation. A Tat-affinity column bound one transcription factor, Tat-SF1, efficiently and selectively. Tat-SF1 was identified originally as a Tat-specific coactivator, but we show it is a general transcription elongation factor. Our results also reveal the existence of an ATP-inactivatable general elongation factor (AIEF) required for Tat-SF1 activity and for which Tat can substitute functionally.