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2015 ; 59
(6
): 917-30
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SPOP Promotes Ubiquitination and Degradation of the ERG Oncoprotein to Suppress
Prostate Cancer Progression
#MMPMID26344095
Gan W
; Dai X
; Lunardi A
; Li Z
; Inuzuka H
; Liu P
; Varmeh S
; Zhang J
; Cheng L
; Sun Y
; Asara JM
; Beck AH
; Huang J
; Pandolfi PP
; Wei W
Mol Cell
2015[Sep]; 59
(6
): 917-30
PMID26344095
show ga
The ERG gene is fused to TMPRSS2 in approximately 50% of prostate cancers (PrCa),
resulting in its overexpression. However, whether this is the sole mechanism
underlying ERG elevation in PrCa is currently unclear. Here we report that ERG
ubiquitination and degradation are governed by the Cullin 3-based ubiquitin
ligase SPOP and that deficiency in this pathway leads to aberrant elevation of
the ERG oncoprotein. Specifically, we find that truncated ERG (?ERG), encoded by
the ERG fusion gene, is stabilized by evading SPOP-mediated destruction, whereas
prostate cancer-associated SPOP mutants are also deficient in promoting ERG
ubiquitination. Furthermore, we show that the SPOP/ERG interaction is modulated
by CKI-mediated phosphorylation. Importantly, we demonstrate that DNA damage
drugs, topoisomerase inhibitors, can trigger CKI activation to restore the
SPOP/?ERG interaction and its consequent degradation. Therefore, SPOP functions
as a tumor suppressor to negatively regulate the stability of the ERG oncoprotein
in prostate cancer.