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A novel polypyrimidine tract-binding protein paralog expressed in smooth muscle cells.

J Biol Chem. 2003 Apr 25;278(17):15201-7. Epub 2003 Feb 10
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摘要


Polypyrimidine tract-binding protein (PTB) is an abundant widespread RNA-binding protein with roles in regulation of pre-mRNA alternative splicing and 3'-end processing, internal ribosomal entry site-driven translation, and mRNA localization. Tissue-restricted paralogs of PTB have previously been reported in neuronal and hematopoietic cells. These proteins are thought to replace many general functions of PTB, but to have some distinct activities, e.g. in the tissue-specific regulation of some alternative splicing events. We report the identification and characterization of a fourth rodent PTB paralog (smPTB) that is expressed at high levels in a number of smooth muscle tissues. Recombinant smPTB localized to the nucleus, bound to RNA, and was able to regulate alternative splicing. We suggest that replacement of PTB by smPTB might be important in controlling some pre-mRNA alternative splicing events.

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