Ubiquitylation and degradation of adenomatous polyposis coli by MKRN1 enhances Wnt/β-catenin signaling

Hae Kyung Lee, Eun Woo Lee, Jinho Seo, Manhyung Jeong, Seon Hyeong Lee, Soo Youl Kim, Eek Hoon Jho, Chel Hun Choi, Joon Yong Chung, Jaewhan Song

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The adenomatous polyposis coli (APC) protein has a tumor-suppressor function by acting as a negative regulator of the Wnt signaling pathway. While its role as a tumor suppressor is well-defined, the post-translational modifications that regulate APC stability are not fully understood. Here we showed that MKRN1, an E3 ligase, could directly interact with and ubiquitylate APC, promoting its proteasomal degradation. In contrast, an E3 ligase-defective MKRN1 mutant was no longer capable of regulating APC, indicating that its E3 ligase activity is required for APC regulation by MKRN1. Strengthening these results, MKRN1 ablation resulted in reduced β-catenin activity and decreased expression of Wnt target genes. The ability of the Wnt-dependent pathway to induce cancer cell proliferation, migration, and invasion was impaired by MKRN1 depletion, but restored by simultaneous APC knockdown. Taken together, these results demonstrate that MKRN1 functions as a novel E3 ligase of APC that positively regulates Wnt/β-catenin-mediated biological processes.

Original languageEnglish
Pages (from-to)4273-4286
Number of pages14
Issue number31
StatePublished - 2 Aug 2018


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