Anti-termination of transcription within the long terminal repeat of HIV-1 by tat gene product View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1987-12

AUTHORS

S Y Kao, A F Calman, P A Luciw, B M Peterlin

ABSTRACT

Human immunodeficiency virus-1 (HIV-1) gene expression is controlled by cellular transcription factors and by virally encoded trans-activation proteins of the HIV-1 tat and art/trs genes, which are essential for viral replication. Tat trans-activates HIV-1 gene expression by interacting with the trans-acting response element (TAR) located within the HIV-1 long terminal repeat (LTR) (ref. 2). In transient expression assays, tat mediates its effects largely by increasing the steady-state levels of messenger RNA species that contain the TAR sequence at or near their 5' ends, suggesting a function for tat either in transcription or in subsequent RNA processing. The tat gene could also facilitate translation of mRNA containing the TAR sequence. To determine the mechanism of trans-activation by tat, we analysed the structure and rate of synthesis of RNA species directed by the HIV-1 LTR in transient expression assays both in the presence and absence of tat. Although the rate of HIV-1 transcription initiation was not affected by tat, transcriptional elongation beyond position +59 was seen only in the presence of tat. Thus, tat trans-activates HIV-1 transcription by relieving a specific block to transcriptional elongation within the TAR sequence. More... »

PAGES

489-493

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/330489a0

DOI

http://dx.doi.org/10.1038/330489a0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1026049650

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/2825027


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