p62 serves as a shuttling factor for TrkA interaction with the proteasome

被引：44

作者：

Geetha, Thangiah ^{[1
]}

Seibenhener, M. Lamar ^{[1
]}

Chen, Li ^{[2
]}

Madura, Kiran ^{[2
]}

Wooten, Marie W. ^{[1
]}

机构：

[1] Auburn Univ, Dept Biol Sci, Program Cellular & Mol Biosci, Auburn, AL 36849 USA

[2] Univ Med & Dent New Jersey, Robert Wood Johnson Med Sch, Dept Biochem, Piscataway, NJ 08854 USA

来源：

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS | 2008年 / 374卷 / 01期

关键词：

TrkA; p62; Rpt1; proteasome; shuttling protein; degradation;

D O I：

10.1016/j.bbrc.2008.06.082

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The scaffold protein p62 is involved in internalization and trafficking of TrkA. The receptor is deubiquitinated by the proteasomes prior to degradation by lysosomes. Here we demonstrate that p62 serves as a shuttling protein for interaction of ubiquitinated TrkA with Rpt1, one of the six ATPases of 195 regulatory particle of the 26S proteasome. In p62(-/-) mouse brain TrkA failed to interact with the Rpt1. The interaction of TrkA with Rpt1 was reduced in proteasomes isolated from p62(-/-) brain, but was restored by addition of p62. The UBA domain of p62 interacts with TrkA and its PB1/UbL domain with AAA-ATPase cassette in the C-terminal region of Rpt1. Last, neurotrophin-dependent turnover of TrkA was impaired by reduction in the level of p62. These findings reveal that p62 serves as a shuttling factor for interaction of ubiquitinated Substrates with the proteasome and could Promote localized protein turnover in neurons. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：33 / 37

页数：5

共 22 条

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