title: USP47 and C terminus of Hsp70-interacting protein (CHIP) antagonistically regulate katanin-p60-mediated axonal growth.
abstract: 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.
authors.affiliation: School of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea.
authors.forename: Seung Wook
authors.initials: SW
authors.lastname: Yang
authors.forename: Kyu Hee
authors.initials: KH
authors.lastname: Oh
authors.forename: Esther
authors.initials: E
authors.lastname: Park
authors.forename: Hyun Min
authors.initials: HM
authors.lastname: Chang
authors.forename: Jung Mi
authors.initials: JM
authors.lastname: Park
authors.forename: Min Woo
authors.initials: MW
authors.lastname: Seong
authors.forename: Seung Hyeun
authors.initials: SH
authors.lastname: Ka
authors.forename: Woo Keun
authors.initials: WK
authors.lastname: Song
authors.forename: Dong Eun
authors.initials: DE
authors.lastname: Park
authors.forename: Peter W
authors.initials: PW
authors.lastname: Baas
authors.forename: Young Joo
authors.initials: YJ
authors.lastname: Jeon
authors.forename: Chin Ha
authors.initials: CH
authors.lastname: Chung
mesh_terms: D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D001369:Axons / Q000502:physiology*; D002478:Cells, Cultured; D004622:Embryo, Mammalian; D005260:Female; D005346:Fibroblast Growth Factors / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects / Q000235:genetics; D050958:HSP47 Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism*; D006624:Hippocampus / Q000166:cytology; D006801:Humans; D047468:Immunoprecipitation; D000074201:Katanin; D008297:Male; D051379:Mice; D009474:Neurons / Q000166:cytology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors; D014162:Transfection; D044767:Ubiquitin-Protein Ligases / Q000235:genetics / Q000378:metabolism*; D054875:Ubiquitination / Q000235:genetics
chemical_list: D050958:HSP47 Heat-Shock Proteins; D005346:Fibroblast Growth Factors; C467728:STUB1 protein, human; D044767:Ubiquitin-Protein Ligases; D000251:Adenosine Triphosphatases; C570385:KATNA1 protein, human; D000074201:Katanin
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