Structural and Functional Properties of HIV-1(GER) TAR Sequences.

Abstract:

:Sequencing of HIV-1(GER) long terminal repeat (LTR) has demonstrated, for the first time in an HIV-1 primary isolate, a TAR duplication referred to as TAR1 (nucleotides +1 through +68) and TAR2 (nucleotides +69 through +136). This TAR duplication is stable during replication of HIV-1(GER) isolate in CEM cells. Analysis of LTR-CAT reporter constructs demonstrated that under Tat transactivation the HIV-1(GER)/LTR (containing TAR1 and TAR2) was expressed at a higher level than a similar construct (HIV-1(GER)DeltaTAR) containing a single TAR sequence. Among the two transcription initiation sites found in the HIV-1(GER)/LTR, only the most 5' start site was shown to be functionally active. The predicted secondary structure of the 5'-end mRNAs of HIV-1(GER) suggests it may fold into a double TAR hairpin which resembles that of HIV-2. Finally, HIV-1(GER) Tat protein shows primary sequence similarity with Tat proteins from other isolates of HIV-1 and is apparently unrelated to HIV-2 Tat proteins. This work provides the first evidence of a TAR sequence duplication in HIV-1 which increases the efficiency of transactivation by Tat. Copyright 1996 S. Karger AG, Basel

journal_name

J Biomed Sci

authors

Emiliani S,Coudronnière N,Delsert C,Devaux C

doi

10.1007/BF02253576

keywords:

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

31-40

issue

1

eissn

1021-7770

issn

1423-0127

pii

jbs03031

journal_volume

3

pub_type

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