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2025 ; 16
(1
): 731
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The E3 ubiquitin ligase TRIM56 promotes aggregation and activation of Src protein
through Lys63-linked polyubiquitination in hepatocellular carcinoma
#MMPMID41102183
Zhu L
; Cui X
; Xu H
; Yang M
; Han L
Cell Death Dis
2025[Oct]; 16
(1
): 731
PMID41102183
show ga
Elevated activity of proto-oncogene tyrosine kinase Src is associated with
tumorigenesis and progression of hepatocellular carcinoma (HCC). It is well
recognized that activation of Src is mainly driven by its intermolecular
autophosphorylation. However, the precise mechanism involved in the activation of
Src remains to be fully understood. Here we identified tripartite
motif-containing protein (TRIM) 56, a member of E3 ubiquitin ligase family, as a
novel regulator of Src activation. The data revealed that TRIM56 directly
interacted with Src and catalyzed the polyubiquitination and subsequent
aggregation of Src, resulting in Src activation and HCC progression.
Mechanistically, TRIM56 interacted with the SH3 domain of Src protein via its
B-box1 domain and catalyzed the Lys63-linked polyubiquitination of Src at the
Lys184 residue, leading to the aggregation and activation of Src. Altogether,
here we demonstrated that TRIM56 acted as a tumor promoter in HCC and it exerted
a novel regulatory effect on Src activation. Thus, this study suggested a
promising therapeutic strategy for HCC patients by targeting TRIM56.