Distinct Interactions of EBP1 Isoforms with FBXW7 Elicits Different Functions in Cancer

The ErbB3 receptor-binding protein EBP1 encodes two alternatively spliced isoforms P48 and P42. While there is evidence of differential roles for these isoforms in tumorigenesis, little is known about their underlying mechanisms. Here, we demonstrate that EBP1 isoforms interact with the SCF-type ubi...

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Veröffentlicht in:Cancer research (Chicago, Ill.) Ill.), 2017-04, Vol.77 (8), p.1983-1996
Hauptverfasser: Wang, Yuli, Zhang, Pengju, Wang, Yunshan, Zhan, Panpan, Liu, Chunyan, Mao, Jian-Hua, Wei, Guangwei
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container_end_page 1996
container_issue 8
container_start_page 1983
container_title Cancer research (Chicago, Ill.)
container_volume 77
creator Wang, Yuli
Zhang, Pengju
Wang, Yunshan
Zhan, Panpan
Liu, Chunyan
Mao, Jian-Hua
Wei, Guangwei
description The ErbB3 receptor-binding protein EBP1 encodes two alternatively spliced isoforms P48 and P42. While there is evidence of differential roles for these isoforms in tumorigenesis, little is known about their underlying mechanisms. Here, we demonstrate that EBP1 isoforms interact with the SCF-type ubiquitin ligase FBXW7 in distinct ways to exert opposing roles in tumorigenesis. EBP1 P48 bound to the WD domain of FBXW7 as an oncogenic substrate of FBXW7. EBP1 P48 binding sequestered FBXW7α to the cytosol, modulating its role in protein degradation and attenuating its tumor suppressor function. In contrast, EBP1 P42 bound to both the F-box domain of FBXW7 as well as FBXW7 substrates. This adapter function of EBP1 P42 stabilized the interaction of FBXW7 with its substrates and promoted FBXW7-mediated degradation of oncogenic targets, enhancing its overall tumor-suppressing function. Overall, our results establish distinct physical and functional interactions between FBXW7 and EBP1 isoforms, which yield their mechanistically unique isoform-specific functions of EBP1 in cancer. .
doi_str_mv 10.1158/0008-5472.CAN-16-2246
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(LBNL), Berkeley, CA (United States)</creatorcontrib><title>Distinct Interactions of EBP1 Isoforms with FBXW7 Elicits Different Functions in Cancer</title><title>Cancer research (Chicago, Ill.)</title><addtitle>Cancer Res</addtitle><description>The ErbB3 receptor-binding protein EBP1 encodes two alternatively spliced isoforms P48 and P42. While there is evidence of differential roles for these isoforms in tumorigenesis, little is known about their underlying mechanisms. Here, we demonstrate that EBP1 isoforms interact with the SCF-type ubiquitin ligase FBXW7 in distinct ways to exert opposing roles in tumorigenesis. EBP1 P48 bound to the WD domain of FBXW7 as an oncogenic substrate of FBXW7. EBP1 P48 binding sequestered FBXW7α to the cytosol, modulating its role in protein degradation and attenuating its tumor suppressor function. In contrast, EBP1 P42 bound to both the F-box domain of FBXW7 as well as FBXW7 substrates. This adapter function of EBP1 P42 stabilized the interaction of FBXW7 with its substrates and promoted FBXW7-mediated degradation of oncogenic targets, enhancing its overall tumor-suppressing function. 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subjects 60 APPLIED LIFE SCIENCES
Adaptor Proteins, Signal Transducing - genetics
Adaptor Proteins, Signal Transducing - metabolism
Alternative splicing
Animals
BASIC BIOLOGICAL SCIENCES
Binding Sites
Cancer
Cdc4 protein
Cell Cycle Proteins - deficiency
Cell Cycle Proteins - genetics
Cell Cycle Proteins - metabolism
Cell Line, Tumor
colorectal cancer
Cytoplasm - metabolism
Cytosol
EBP1 P42
EBP1 P48
EBP1 protein
ErbB-3 protein
F-Box Proteins - genetics
F-Box Proteins - metabolism
F-Box-WD Repeat-Containing Protein 7
FBXW7
Glycogen Synthase Kinase 3 beta - metabolism
HCT116 Cells
HEK293 Cells
Heterografts
Humans
Immunohistochemistry
Isoforms
Mice
Mice, Nude
Neoplasms - genetics
Neoplasms - metabolism
Neoplasms - pathology
Phenotype
Proteasome Endopeptidase Complex - metabolism
Protein Interaction Maps
protein isoform
Protein Isoforms
Proteins
RNA-Binding Proteins - genetics
RNA-Binding Proteins - metabolism
Substrates
Tumor suppressor genes
Tumorigenesis
Ubiquitin
Ubiquitin-protein ligase
Ubiquitin-Protein Ligases - deficiency
Ubiquitin-Protein Ligases - genetics
Ubiquitin-Protein Ligases - metabolism
title Distinct Interactions of EBP1 Isoforms with FBXW7 Elicits Different Functions in Cancer
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