home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Shareware Overload Trio 2
/
Shareware Overload Trio Volume 2 (Chestnut CD-ROM).ISO
/
dir26
/
med9408c.zip
/
M9480487.TXT
< prev
next >
Wrap
Text File
|
1994-08-20
|
3KB
|
46 lines
Document 0487
DOCN M9480487
TI Molecular cloning of a novel human cDNA encoding a zinc finger protein
that binds to the interleukin-3 promoter.
DT 9410
AU Koyano-Nakagawa N; Nishida J; Baldwin D; Arai K; Yokota T; Department of
Molecular and Development Biology, Institute of; Medical Science,
University of Tokyo, Japan.
SO Mol Cell Biol. 1994 Aug;14(8):5099-107. Unique Identifier : AIDSLINE
GENBANK/D28118
AB The CT/GC-rich region (-76 to -47) is one transcriptional regulatory
region of the interleukin-3 (IL-3) gene which confers basic
transcriptional activity and responds to trans-activation by human
T-cell leukemia virus type I-encoded Tax. We isolated three types of
cDNAs encoding Cys2/His2-type zinc finger proteins that bind to this
region. Two were identical to known transcription factors, EGR1 and
EGR2, and the other clone, named DB1, encoded a novel protein of 516
amino acids with six zinc finger motifs. DB1 mRNA was present in human
tissues, ubiquitously. Two constitutive transcripts of 4.0 and 4.8 kb in
length were present in Jurkat cells. Electrophoretic mobility shift
assay, with specific antibodies, showed that DB1 constitutively binds to
this region whereas EGR1 binds in a T-cell activation-dependent manner.
Overexpression of DB1 in Jurkat cells had no detectable effect on the
transcription activity of the IL-3 promoter, in a transient-transfection
assay. EGR1 and EGR2 increased IL-3 promoter activity when the
transfected cells were stimulated with phorbol-12-myristate-13-acetate
and A23187. When DB1 was cotransfected with a Tax expression vector,
transcription activity of the IL-3 promoter induced by Tax was
significantly increased, while EGR1 and EGR2 were without effect. These
results suggest that EGR1 has a role in inducible transcription of the
IL-3 gene, while DB1 sustains basal transcriptional activity and also
cooperates with Tax to activate the IL-3 promoter.
DE Amino Acid Sequence Base Sequence Calcimycin/PHARMACOLOGY Cell Line
Cloning, Molecular DNA-Binding Proteins/*GENETICS/METABOLISM DNA,
Complementary/GENETICS Gene Expression Regulation/DRUG EFFECTS Gene
Products, tax/GENETICS Human Interleukin-3/*GENETICS Macromolecular
Systems Molecular Sequence Data Oligodeoxyribonucleotides/CHEMISTRY
Promoter Regions (Genetics) RNA, Messenger/GENETICS Support, Non-U.S.
Gov't Tetradecanoylphorbol Acetate/PHARMACOLOGY Tissue Distribution
Transcription Factors/*GENETICS/METABOLISM Transcription, Genetic/DRUG
EFFECTS *Zinc Fingers JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).