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The polypyrimidine tract binding (PTB) protein interacts with single-stranded DNA in a sequence-specific manner
1Unité d'Expression des Gènes Eucaryotes, Institut Pasteur, Paris, France.
Nucleic Acids Research
|May 1, 1996
Summary
Polypyrimidine tract binding (PTB) protein specifically binds to single-stranded DNA sequences. Researchers found PTB interacts with the adenovirus major late promoter initiator, revealing its organized binding domains.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Polypyrimidine tract binding (PTB) protein is a cellular factor with an uncharacterized function.
- PTB is known to interact with various RNA and single-stranded DNA sequences.
Purpose of the Study:
- To investigate the sequence specificity of PTB binding to single-stranded DNA.
- To identify specific DNA targets of PTB.
- To characterize the binding domains of PTB.
Main Methods:
- Laser UV crosslinking assays to detect DNA-protein interactions.
- Electrophoretic mobility shift assays (EMSA) to analyze binding specificity.
- Sequence analysis of PTB-interacting DNA regions.
Main Results:
- PTB exhibits highly sequence-specific binding to single-stranded DNA targets.
- PTB interacts with the top strand of the adenovirus major late promoter transcriptional initiator, a pyrimidine-rich sequence.
- Evidence suggests PTB is organized into at least two distinct DNA-binding domains.
Conclusions:
- PTB binding to single-stranded DNA is sequence-specific.
- The adenovirus major late promoter initiator is a novel DNA target for PTB.
- PTB possesses multiple, distinct DNA-binding domains, suggesting complex regulatory roles.