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

Title
Novel dual-binding function of a poly (C)-binding protein 3, transcriptional factor which binds the double-strand and single-stranded DNA sequence
Authors
Kang D.-H.Song K.Y.Choi H.S.Law P.-Y.Wei L.-N.Loh H.H.
Ewha Authors
강덕희최학선
SCOPUS Author ID
강덕희scopus
Issue Date
2012
Journal Title
Gene
ISSN
0378-1119JCR Link
Citation
vol. 501, no. 1, pp. 33 - 38
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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 posttranscriptional 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. This study demonstrates for the first time that PCBP3 can function as a repressor dependent on binding to single-strand and double-stranded poly(C) sequences. © 2012 Elsevier B.V..
DOI
10.1016/j.gene.2012.04.001
Appears in Collections:
의학전문대학원 > 의학과 > Journal papers
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