TY - JOUR T1 - USP47 and C Terminus of Hsp70-Interacting Protein (CHIP) Antagonistically Regulate Katanin-p60-Mediated Axonal Growth JF - The Journal of Neuroscience JO - J. Neurosci. SP - 12728 LP - 12738 DO - 10.1523/JNEUROSCI.0698-13.2013 VL - 33 IS - 31 AU - Seung Wook Yang AU - Kyu Hee Oh AU - Esther Park AU - Hyun Min Chang AU - Jung Mi Park AU - Min Woo Seong AU - Seung Hyeun Ka AU - Woo Keun Song AU - Dong Eun Park AU - Peter W. Baas AU - Young Joo Jeon AU - Chin Ha Chung Y1 - 2013/07/31 UR - http://www.jneurosci.org/content/33/31/12728.abstract N2 - Katanin is a heterodimeric enzyme that severs and disassembles microtubules. While the p60 subunit has the enzyme activity, the p80 subunit regulates the p60 activity. The microtubule-severing activity of katanin plays an essential role in axonal growth. However, the mechanisms by which neuronal cells regulate the expression of katanin-p60 remains unknown. Here we showed that USP47 and C terminus of Hsp70-interacting protein (CHIP) antagonistically regulate the stability of katanin-p60 and thereby axonal growth. USP47 was identified as a katanin-p60-specific deubiquitinating enzyme for its stabilization. We also identified CHIP as a ubiquitin E3 ligase that promotes proteasome-mediated degradation of katanin-p60. Moreover, USP47 promoted axonal growth of cultured rat hippocampal neurons, whereas CHIP inhibited it. Significantly, treatment with basic fibroblast growth factor (bFGF), an inducer of axonal growth, increased the levels of USP47 and katanin-p60, but not CHIP. Consistently, bFGF treatment resulted in a marked decrease in the level of ubiquitinated katanin-p60 and thereby in the promotion of axonal growth. On the other hand, the level of USP47, but not CHIP, decreased concurrently with that of katanin-p60 as axons reached their target cells. These results indicate that USP47 plays a crucial role in the control of axonal growth during neuronal development by antagonizing CHIP-mediated katanin-p60 degradation. ER -