home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Arsenal Files 6
/
The Arsenal Files 6 (Arsenal Computer).ISO
/
health
/
med9603.zip
/
M9630045.TXT
< prev
next >
Wrap
Text File
|
1996-02-27
|
2KB
|
39 lines
Document 0045
DOCN M9630045
TI Interaction of bovine leukemia virus transactivator Tax with bZip
proteins.
DT 9603
AU Boros IM; Tie F; Giam CZ; Department of Medicine, Case Western Reserve
University,; Cleveland, Ohio 44106, USA.
SO Virology. 1995 Dec 1;214(1):207-14. Unique Identifier : AIDSLINE
MED/96095239
AB The bovine leukemia virus transactivator, BLV Tax, augments
transcription from three imperfect 21-bp repeats in the viral
transcriptional regulatory region. Each BLV 21-bp repeat contains a cAMP
response element (CRE) in the center and unique 5' and 3' neighboring
sequences which are crucial for the transcriptional activation by BLV
Tax. Here we describe the interactions of recombinant BLV Tax with
cellular bZip proteins. The recombinant BLV Tax, tagged at the carboxy
terminus with a hexahistidine extension, was prepared by solubilization
in 6 M guanidine hydrochloride and renaturation on the Ni(2+)-chelating
Sepharose gel matrix. The renatured BLV TaxH6 activates the BLV LTR when
introduced into HeLa cells by scrape loading. Furthermore, the purified
BLV TaxH6 enhances binding of members of the CREB/ATF family of bZip
proteins to CRE motifs by interacting with their bZip domains in vitro.
Chemical cross-linking indicates that dimerization of bZip proteins such
as CREB becomes greatly facilitated in the presence of BLV Tax. These
results suggest that BLV Tax interacts directly with CREB/ATF-like
factors to activate viral mRNA transcription.
DE Amino Acid Sequence Animal Base Sequence Cattle DNA Primers
DNA-Binding Protein, Cyclic AMP-Responsive/METABOLISM DNA-Binding
Proteins/*METABOLISM DNA, Viral/METABOLISM Gene Products,
tax/*METABOLISM Human Leukemia Virus, Bovine/GENETICS/*METABOLISM
Molecular Sequence Data Protein Binding Repetitive Sequences, Nucleic
Acid Retroviridae Proteins, Oncogenic/*METABOLISM Support, Non-U.S.
Gov't Support, U.S. Gov't, P.H.S. Trans-Activators/*METABOLISM
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).