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M9630714.TXT
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1996-02-27
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Document 0714
DOCN M9630714
TI Dissecting protein:protein interactions between transcription factors
with an RNA aptamer.
DT 9603
AU Tian Y; Adya N; Wagner S; Giam CZ; Green MR; Ellington AD; Department of
Chemistry, Indiana University, Bloomington 47405,; USA.
SO RNA. 1995 May;1(3):317-26. Unique Identifier : AIDSLINE MED/96079963
AB Nucleic acid aptamers isolated from random sequence pools have generally
proven useful at inhibiting the interactions of nucleic acid binding
proteins with their cognate nucleic acids. In order to develop reagents
that could also be used to study protein:protein interactions, we have
used in vitro selection to search for RNA aptamers that could interact
with the transactivating protein Tax from human T-cell leukemia virus.
Tax does not normally bind to nucleic acids, but instead stimulates
transcription by interacting with a variety of cellular transcription
factors, including the cyclic AMP-response element binding protein
(CREB), NF-kappa B, and the serum response factor (SRF). Starting from a
pool of greater than 10(13) different RNAs with a core of 120 random
sequence positions, RNAs were selected for their ability to be
co-retained on nitrocellulose filters with Tax. After five cycles of
selection and amplification, a single nucleic acid species remained.
This aptamer was found to bind Tax with high affinity and specificity,
and could disrupt complex formation between Tax and NF-kappa B, but not
with SRF. The differential effects of our aptamer probe on
protein:protein interactions suggest a model for how the transcription
factor binding sites on the surface of the Tax protein are organized.
This model is consistent with data from a variety of other studies.
DE Base Sequence Binding Sites Binding, Competitive DNA-Binding Protein,
Cyclic AMP-Responsive/METABOLISM DNA-Binding Proteins/METABOLISM Gene
Products, tax/ANTAGONISTS & INHIB/*METABOLISM Molecular Sequence Data
Nuclear Proteins/METABOLISM NF-kappa B/METABOLISM Protein Binding
RNA/ANTAGONISTS & INHIB/*METABOLISM Support, Non-U.S. Gov't Support,
U.S. Gov't, Non-P.H.S. Transcription Factors/*METABOLISM JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).