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Author Murahashi, Masataka ♦ Simizu, Siro ♦ Morioka, Masahiko ♦ Umezawa, Kazuo
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword APPLIED LIFE SCIENCES ♦ BIOTIN ♦ CYCLOSPORINE ♦ CYTOPLASM ♦ HEAT-SHOCK PROTEINS ♦ MOLECULES ♦ RNA ♦ TRANSCRIPTION ♦ TRANSDUCERS
Abstract 15-Deoxyspergualin (DSG) is an immunosuppressive agent being clinically used. Unlike tacrolimus and cyclosporine A, it does not inhibit the calcineurin pathway, and its mechanism of action and target molecule have not been elucidated. Therefore, we previously prepared biotinylated derivative of DSG (BDSG) to fish up the target protein. In the present research, we identified poly(rC) binding protein 2 (PCBP2) as a DSG-binding protein using this probe. DSG was confirmed to bind to PCBP2 by pull-down assay. Intracellular localization of PCBP2 was changed from the nucleus to the cytoplasm by DSG treatment. DSG inhibited the cell growth, and over-expression of PCBP2 reduced the anti-proliferative activity of DSG. PCBP2 is known to regulate various proteins including STAT1/2. Thus, we found PCBP2 as the first target protein of DSG that can explain the immunosuppressive activity. -- Highlights: •Fifteen-deoxyspergualin (DSG) is an immunosuppressive agent clinically used. •We have identified PCBP2, an RNA-binding protein, as a molecular target of DSG. •Alteration of PCBP2 activity may explain the immunosuppressive activity of DSG.
ISSN 0006291X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-08-05
Publisher Place United States
Journal Biochemical and Biophysical Research Communications
Volume Number 476
Issue Number 4


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