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M9490564.TXT
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1994-09-24
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Document 0564
DOCN M9490564
TI Quantitative studies of the effect of HTLV-I Tax protein on CREB
protein--DNA binding.
DT 9411
AU Anderson MG; Dynan WS; Department of Chemistry and Biochemistry,
University of Colorado,; Boulder 80309.
SO Nucleic Acids Res. 1994 Aug 11;22(15):3194-201. Unique Identifier :
AIDSLINE MED/94344786
AB The human T-cell leukemia virus type I (HTLV-I) Tax protein increases
the DNA binding activity of a number of different host cell
transcription factors, including the cyclic AMP response element binding
protein (CREB). We have performed quantitative studies of CREB binding
in the presence and absence of Tax in an attempt to gain insight into
the mechanism of the Tax effect. Enhancement of binding occurred over a
wide range of CREB concentrations, but sharply increased at the lowest
concentrations tested. The data are best explained by a two-step binding
model where Tax changes the apparent equilibrium constants for both a
CREB-CREB dimerization step and a (CREB)2-DNA binding step. We used the
model to perform a quantitative analysis of the binding of CREB to DNA
that had been mutated at positions flanking the core CREB recognition
site. Results suggest that there are altered or more extensive
DNA-protein contacts at these positions in the presence of Tax. We also
used the model to analyze differences in the interaction of Tax with
nonphosphorylated and protein kinase A-phosphorylated CREB protein.
There was no significant change in the behavior of CREB upon
phosphorylation.
DE Base Sequence Binding Sites Cyclic AMP-Dependent Protein
Kinases/METABOLISM DNA/CHEMISTRY/*METABOLISM DNA-Binding Protein,
Cyclic AMP-Responsive/CHEMISTRY/*METABOLISM Escherichia coli Gene
Products, tax/*PHARMACOLOGY Macromolecular Systems Molecular Sequence
Data Phosphorylation Recombinant Proteins/PHARMACOLOGY
Structure-Activity Relationship Support, Non-U.S. Gov't Support, U.S.
Gov't, Non-P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).