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M9550068.TXT
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1995-03-04
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Document 0068
DOCN M9550068
TI A CNS-enriched factor that binds to NF-kappa B and is required for
interaction with HIV-1 tat.
DT 9505
AU Taylor JP; Pomerantz RJ; Oakes JW; Khalili K; Amini S; Jefferson
Institute of Molecular Medicine, Department of; Biochemistry and
Molecular Biology, Thomas Jefferson University,; Philadelphia,
Pennsylvania 19107.
SO Oncogene. 1995 Jan 19;10(2):395-400. Unique Identifier : AIDSLINE
MED/95140429
AB The Human Immunodeficiency Virus type 1 (HIV-1) Tat protein is a potent
activator of transcription directed by the long terminal repeat (LTR),
an essential step in the life-cycle of HIV-1. While interaction of Tat
with an RNA element encoded by downstream LTR sequences (termed TAR) is
commonly considered essential to activation, numerous recent reports
have implicated upstream transcription elements within the LTR as
participants in mediating this activation. We have recently demonstrated
that Tat activation occurs independent of the TAR element in certain
cells derived from the central nervous system (CNS), and that this
activation is mediated by the kappa B domain of the LTR. Further,
CNS-derived cells were found to contain kappa B-binding activity capable
of both interacting with Tat and activating LTR transcription in vitro.
The present study demonstrates that the kappa B-binding transcription
factor derived from CNS cells consists of a component indistinguishable
from prototypical Nuclear Factor-kappa B (NF-kappa B) (in size, mobility
on native gel, kinetics of activation and cognate binding sequence) as
well as a supershifting component that is dissociable under certain
conditions. The supershifting activity is found to stabilize binding of
the presumed NF-kappa B to DNA. Further, only the form of NF-kappa B
which is associated with this supershifting activity is capable of
binding Tat. We hypothesize a model in which Tat utilizes this
interaction to activate HIV-1 through the NF-kappa B domain of the LTR
in circumstances where TAR is absent. This model has implications with
respect to the ability of Tat to alter cellular gene expression and
perhaps contribute to the array of problems seen in HIV-1 infection such
as altered immune status, CNS toxicity, and the formation of tumors.
DE Astrocytes/*METABOLISM Base Sequence Electrophoresis, Gel,
Two-Dimensional Gene Products, tat/*PHYSIOLOGY HIV-1/*PHYSIOLOGY
Models, Genetic Molecular Sequence Data NF-kappa B/*METABOLISM
Repetitive Sequences, Nucleic Acid Support, U.S. Gov't, P.H.S.
Trans-Activation (Genetics) JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).