The HIV-1 Tat cellular coactivator Tat-SF1 is a general transcription elongation factor
Howard Hughes Medical Institute; Program in Molecular Medicine; Program in Gene Function and Expression
Electrophoresis, Polyacrylamide Gel; Gene Products, tat; HIV Long Terminal Repeat; *HIV-1; Humans; Plasmids; Trans-Activators; Transcription, Genetic; tat Gene Products, Human Immunodeficiency Virus
Life Sciences | Medicine and Health Sciences
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.
Genes Dev. 1998 Oct 1;12(19):2992-6.
Genes and development
Li, Xiao-Yong and Green, Michael R., "The HIV-1 Tat cellular coactivator Tat-SF1 is a general transcription elongation factor" (1998). Open Access Articles. 596.