home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Software Vault: The Sapphire Collection
/
Software Vault (Sapphire Collection) (Digital Impact).ISO
/
cdr16
/
med9410d.zip
/
M94A0629.TXT
< prev
next >
Wrap
Text File
|
1994-10-21
|
2KB
|
39 lines
Document 0629
DOCN M94A0629
TI Multiple proteins interact over the USF binding site in the human
immunodeficiency virus type 1 long terminal repeat.
DT 9412
AU Tanskanen E; Deacon N; Churchill M; Doherty R; Macfarlane Burnet Centre
for Medical Research, Fairfield, Vic.
SO Annu Conf Australas Soc HIV Med. 1993 Oct 28-30;5:69 (abstract no. FB4).
Unique Identifier : AIDSLINE ASHM5/94349026
AB HIV-1 gene expression and viral replication are regulated by several
viral and cellular proteins, most commonly through binding sites within
the long terminal repeats (LTRs) of the viral genome. We have examined
binding of transcription factors over the region from nt -141 to nt -180
relative to transcription initiation using a novel approach in which a
series of five oligonucleotides were constructed with 13bp overlapping
altered sequences as compared to the wild-type HXB2 sequence. These
oligonucleotides were used in excess as competitors for protein binding
in electrophoretic mobility shift assays. Three of the five
oligonucleotides lost the ability to compete for proteins binding to the
wildtype sequence, localising nuclear factor binding to sequences
upstream of nt -159. This region contains the motif CACATG which has
previously been shown by DNAse footprinting to bind the transcription
factor USF (Giacca et al, Virology 1992; 186:133-147), however our data
indicate a more precise region of interaction. Examination of binding
from nuclear extracts of the lymphoblastoid cell lines CEM and MT-2 as
well as the epithelial HeLa cell line has shown that the interaction
involves more than one protein and that the different cell lines exhibit
different binding patterns over this region of the LTR. We have
calculated the approximate size of these DNA-protein complexes by UV
crosslinking and south-western analyses.
DE Cell Line DNA-Binding Proteins/*GENETICS Gene Expression Regulation,
Viral/PHYSIOLOGY Human HIV-1/*GENETICS Repetitive Sequences, Nucleic
Acid/*GENETICS Transcription Factors/*GENETICS Virus
Replication/*GENETICS MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).