Regulation of C1-Ten protein tyrosine phosphatase by p62/SQSTM1-mediated sequestration and degradation
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- Regulation of C1-Ten protein tyrosine phosphatase by p62/SQSTM1-mediated sequestration and degradation
- Koh, Ara; Park, Dohyun; Jeong, Heeyoon; Lee, Jiyoun; Lee, Mi Nam; Suh, Pann-Ghill; Ryu, Sung Ho
- Issue Date
- ELSEVIER SCIENCE INC
- CELLULAR SIGNALLING, v.26, no.11, pp.2470 - 2480
- C1-Ten is a member of the tensin family of focal adhesion molecules but recent studies suggest it plays a more active role in many biological processes because of its potential association with diabetes and cancers. However, relatively little is known about the regulation of C1-Ten, such as changes in its protein level or cellular localization. The cellular localization of C1-Ten is unique because it is expressed in cytoplasmic puncta but nothing is known about these puncta. Here, we show that p62 sequestrates C1-Ten into puncta, making C1-Ten diffuse into the cytoplasm upon p62 depletion. More importantly, p62-mediated C1-Ten sequestration promoted C1-Ten ubiquitination and proteasomal degradation. p62-mediated protein reduction was specific to C1-Ten, and not other tensins such as tensin1 and tensin3. Thus, our results link cellular localization of C1-Ten to an off-switch site for C1-Ten. Additionally, p62 expression increased but C1-Ten protein decreased during muscle differentiation, supporting a role for p62 as a physiological regulator of C1-Ten.
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