The E3 Ubiquitin Ligase WWP1 Selectively Targets HER4 and Its Proteolytically Derived Signaling Isoforms for Degradation

被引:42
作者
Feng, Shu-Mang [1 ]
Muraoka-Cook, Rebecca S. [1 ,2 ]
Hunter, Debra [1 ]
Sandahl, Melissa A. [1 ]
Caskey, Laura S. [1 ]
Miyazawa, Keiji [4 ]
Atfi, Azeddine [5 ]
Earp, H. Shelton, III [1 ,3 ]
机构
[1] Univ N Carolina, Lineberger Comprehens Canc Ctr, Chapel Hill, NC 27599 USA
[2] Univ N Carolina, Dept Genet, Chapel Hill, NC 27599 USA
[3] Univ N Carolina, Dept Med & Pharmacol, Chapel Hill, NC 27599 USA
[4] Univ Tokyo, Dept Mol Pathol, Bunkyo Ku, Tokyo 1130033, Japan
[5] Hop St Antoine, INSERM, U482, F-75571 Paris, France
关键词
GROWTH-FACTOR RECEPTOR; TYROSINE KINASE; NUCLEAR-LOCALIZATION; MITOTIC PROGRESSION; BREAST CARCINOMAS; PROGNOSTIC VALUE; ERBB4; ISOFORM; NEDD4; FAMILY; EXPRESSION; DOMAIN;
D O I
10.1128/MCB.00595-08
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
In general, epidermal growth factor receptor family members stimulate cell proliferation. In contrast, at least one HER4 isoform, JM-a/Cyt1, inhibits cell growth after undergoing a two-step proteolytic cleavage that first produces a membrane-anchored 80-kDa fragment (m80(HER4)) and subsequently liberates a soluble 80-kDa fragment, s80(HER4). Here we report that s80(HER4) Cyt1 action increased the expression of WWP1 (for WW domain-containing protein 1), an E3 ubiquitin ligase, but not other members of the Nedd4 E3 ligase family. The HER4 Cyt1 isoform contains three proline-rich tyrosine (PY) WW binding motifs, while Cyt2 has only two. WWP1 binds to all three Cyt1 PY motifs; the interaction with PY2 found exclusively in Cyt1 was strongest. WWP1 ubiquitinated and caused the degradation of HER4 but not of EGFR, HER2, or HER3. The HER4WWP1 interaction also accelerated WWP1 degradation. Membrane HER4 (full length and m80(HER4), the product of the first proteolytic cleavage) were the preferred targets of WWP1, correlating with the membrane localization of WWP1. Conversely s80(HER4), a poorer WWP1 substrate, was found in the cell nucleus, while WWP1 was not. Deletion of the C2 membrane association domain of WWP1 allowed more efficient s80(HER4) degradation, suggesting that WWP1 is normally part of a membrane complex that regulates HER4 membrane species levels, with a predilection for the growth-inhibitory Cyt1 isoform. Finally, WWP1 expression diminished HER4 biologic activity in MCF-7 cells. We previously showed that nuclear s80(HER4) is ubiquitinated and degraded by the anaphase-promoting complex, suggesting that HER4 ubiquitination within specific cellular compartments helps regulate the unique HER4 signaling capabilities.
引用
收藏
页码:892 / 906
页数:15
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