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M94A3301.TXT
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1994-10-25
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Document 3301
DOCN M94A3301
TI Study of HIV1 Tat transactivation mechanism by using synthetic Tat
protein and Tat peptides.
DT 9412
AU Vives E; Charneau P; van Rietschoten J; Rochat H; Bahraoui E; CNRS URA
1455, Marseille.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):107 (abstract no. PA0046). Unique
Identifier : AIDSLINE ICA10/94369274
AB OBJECTIVE: To study the structure function relationship of different Tat
domains in the mechanism of HIV-1 Tat transactivation. METHODS:
Full-length Tat protein Tat 1-86, the gene product of the first exon Tat
1-72 and a panel of shorter peptides mimicking different regions of the
primary structure of Tat protein were chemically synthesized and tested
for their activity. RESULTS: Synthetic Tat 1-86 and Tat 1-72
transactivated beta galactosidase activity in Hela cells containing the
Lac Z gene under the control of HIV-1. The analysis of the activity of
Tat 1-86 and Tat 1-72 with cysteine SH free or alkylated, showed that
only the Tat fragments with deprotected cysteine residues (SH free)
retain transactivation ability. In contrast, peptide Tat 1-48 was
inactive with cysteine residues either free or protected. Similarly,
other shorter synthetic peptides covering the different Tat domains were
inactive. Interestingly, when peptides Tat 1-48 and Tat 38-60 were used
simultaneously, a significant transactivation was obtained. This result
suggests that both peptide domains are implicated in transactivation,
probably by acting at two different sites. DISCUSSION AND CONCLUSION:
This permits to propose a new fundamentally step in the understanding of
the molecular mechanism of Tat transactivation.
DE Binding Sites Gene Products, tat/CHEMICAL
SYNTHESIS/*GENETICS/PHYSIOLOGY Genes, tat Hela Cells Human
HIV-1/*GENETICS/PHYSIOLOGY Peptide Fragments/CHEMICAL
SYNTHESIS/GENETICS/PHYSIOLOGY Structure-Activity Relationship
*Trans-Activation (Genetics)/PHYSIOLOGY MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).