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Prolyl isomerase Pin1 regulates the osteogenic activity of Osterix
Sung Ho Lee1, Hyung Min Jeong1, Younho Han1
1College of Pharmacy & Research Institute of Drug Development, Chonnam National University, Gwangju 500-757, Republic of Korea.
Abstract:
Osterix is an essential transcription factor for osteoblast differentiation and bone formation. The mechanism of regulation of Osterix by post-translational modification remains unknown. Peptidyl-prolyl isomerase 1 (Pin1) catalyzes the isomerization of pSer/Thr-Pro bonds and induces a conformational change in its substrates, subsequently regulating diverse cellular processes. In this study, we demonstrated that Pin1 interacts with Osterix and influences its protein stability and transcriptional activity. This regulation is likely due to the suppression of poly-ubiquitination-mediated proteasomal degradation of Osterix. Collectively, our data demonstrate that Pin1 is a novel regulator of Osterix and may play an essential role in the regulation of osteogenic differentiation.
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