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M94A0741.TXT
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1994-10-21
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Document 0741
DOCN M94A0741
TI Characterisation of putative steroid response elements in the long
terminal repeat of HIV-1.
DT 9412
AU Barnes N; Deacon N; Doherty R; Macfarlane Burnet Centre, Fairfield, Vic.
SO Annu Conf Australas Soc HIV Med. 1993 Oct 28-30;5:102 (poster no. 55).
Unique Identifier : AIDSLINE ASHM5/94348914
AB Motifs with sequence homology to steroid hormone response elements have
been identified in the upstream half of the LTR of HIV by several
investigators, and nuclear factors have been identified in HeLa cell
extracts which bind to these regions. The motifs appear conserved in HIV
consensus sequences, and to a variable degree in strains of SIV, CAEV,
EIAV and HTLV-I. We have studied the functional capacity of the HIV
motifs by transfecting MCF-7 cells with the HIV LTR reporter gene
construct pBENNCAT (Cells were cotransfected with pSVTat72). The
estrogen responsive construct pVITtkCAT was used as control. The effect
of estrogen on HIV LTR controlled transcription was assessed by the CAT
activity present in cell lysates. Modest increases in CAT activity were
observed in estrogen treated cells. In addition, a nuclear protein
present in extracts of estrogen treated MCF-7 and HeLa ER cells was
shown to bind to a synthetic oligonucleotide probe containing the
ERE-like HIV sequence. Further characterisation of this protein is
underway. Mutations have been introduced into the ERE-like region to
abolish the element and to substitute the respective RE consensus
sequence for the wild type HIV sequence in the reporter gene constructs.
DE Estrogens/*PHARMACOLOGY Hela Cells Human HIV-1/*DRUG EFFECTS/GENETICS
Receptors, Estrogen/*DRUG EFFECTS/GENETICS Repetitive Sequences,
Nucleic Acid/*DRUG EFFECTS/GENETICS Sequence Homology Transcription,
Genetic/DRUG EFFECTS MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).