Novel dual-binding function of a poly (C)-binding protein 3, transcriptional factor which binds the double-strand and single-stranded DNA sequence

作者：Rang, Duk-Hee; Song, Kyu Young; Choi, Hack Sun^*; Law, Ping-Yee; Wei, Li-Na; Loh, Horace H.

来源：Gene, 2012, 501(1): 33-38.

DOI：10.1016/j.gene.2012.04.001

• PCBP3
• Double-stranded poly(C) element
• Repressor
• RNA-binding proteins

Poly(C)-binding proteins (PCBPs) are generally known as RNA-binding proteins that interact in a sequence-specific manner with single-stranded poly(C) sequences. These proteins are mainly involved in various post-transcriptional regulations (e.g., mRNA stabilization or translational activation/silencing). This study reports a novel dual-binding function for PCBP3, a member of the PCBP family. Recombinant PCBP3 was purified using affinity column chromatography and its identity confirmed by MALDI-TOF mass spectrometry. The protein folding conditions of the purified and renatured PCBP3 were optimized. Electrophoretic mobility shift assays demonstrated that the recombinant PCBP3 is capable of binding to both double- and single-strand poly(C) sequences. Furthermore, plasmids expressing PCBP3 repressed the expression of luciferase reporters when cotransfected with single-strand (pGL-SS) and double-strand (pGL-DS) constructs containing poly(C) sequences in their promoters. Th

• 出版日期2012-6-10