polypyrimidine tract binding protein 《英文msh詞典》Polypyrimidine Tract Binding Protein ; [入口詞] Polypyrimidine Tract Binding Protein ; [主題詞] Polypyrimidine Tract-Binding Protein ; [英文釋義] A RNA-binding protein that binds to polypyriminidine rich regions in the INTRONS of messenger RNAs. Polypyrimidine tract-binding protein may be involved in regulating the ALTERNATIVE SPLICING of mRNAs since its presence on an intronic RNA region that is upstream of an EXON inhibits the splicing of the exon into the final mRNA product.