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Polypyrimidine tract binding (PTB) protein is a cellular factor whose function is unknown. Various RNA or single-stranded DNA sequences have been shown to interact with PTB. In this paper, using laser UV crosslinking and electrophoretic mobility shift assays to probe DNA-protein interactions, we demonstrate that PTB binding at a single-stranded DNA target is highly sequence-specific. We provide data showing that PTB interacts with the top strand of the adenovirus major late promoter transcriptional initiator, a sequence rich in pyrimidine residues. We also demonstrate that PTB is organised into at least two different binding domains.

The Polypyrimidine Tract Binding (PTB) Protein Interacts With Single-Stranded DNA in a Sequence-Specific Manner