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M9550142.TXT
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1995-03-04
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Document 0142
DOCN M9550142
TI Novel mechanism and factor for regulation by HIV-1 Tat.
DT 9505
AU Zhou Q; Sharp PA; Center for Cancer Research, Massachusetts Institute
of; Technology, Cambridge 02139.
SO EMBO J. 1995 Jan 16;14(2):321-8. Unique Identifier : AIDSLINE
MED/95137012
AB Tat regulation of human immunodeficiency virus (HIV) transcription is
unique because of its specificity for an RNA target, TAR, and its
ability to increase the efficiency of elongation by polymerase. A
reconstituted reaction that is Tat-specific and TAR-dependent for
activation of HIV transcription has been used to identify and partially
purify a cellular activity that is required for trans-activation by Tat,
but not by other activators. In the reaction, Tat stimulates the
efficiency of elongation by polymerase, whereas Sp1 and other DNA
sequence-specific transcription factors activate the rate of initiation.
Furthermore, while TATA binding protein (TBP)-associated factors (TAFs)
in the TFIID complex are required for activation by transcription
factors, they are dispensable for Tat function. Thus, Tat acts through a
novel mechanism, which is mediated by a specific host cellular factor,
to stimulate HIV-1 gene expression.
DE Fungal Proteins/METABOLISM Gene Expression Regulation, Viral Gene
Products, tat/*PHYSIOLOGY Hela Cells Human HIV-1/*GENETICS Support,
Non-U.S. Gov't Support, U.S. Gov't, P.H.S. Trans-Activation (Genetics)
Trans-Activators/METABOLISM Transcription Factors/METABOLISM
Transcription, Genetic JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).