Chen J, Rajasekaran M, Xia H, Kong SN, Deivasigamani A, Sekar K, Gao H, Swa HL, Gunaratne J, Ooi LL, Xie T, Hong W, Hui KM. CDK1-mediated BCL9 phosphorylation inhibits clathrin to promote mitotic Wnt signalling.
EMBO J 2018;
37:embj.201899395. [PMID:
30217955 DOI:
10.15252/embj.201899395]
[Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 08/11/2018] [Accepted: 08/23/2018] [Indexed: 11/09/2022] [Imported: 08/29/2023] Open
Abstract
Uncontrolled cell division is a hallmark of cancer. Deregulation of Wnt components has been linked to aberrant cell division by multiple mechanisms, including Wnt-mediated stabilisation of proteins signalling, which was notably observed in mitosis. Analysis of Wnt components revealed an unexpected role of B-cell CLL/lymphoma 9 (BCL9) in maintaining mitotic Wnt signalling to promote precise cell division and growth of cancer cell. Mitotic interactome analysis revealed a mechanistic role of BCL9 in inhibiting clathrin-mediated degradation of LRP6 signalosome components by interacting with clathrin and the components in Wnt destruction complex; this function was further controlled by CDK1-driven phosphorylation of BCL9 N-terminal, especially T172. Interestingly, T172 phosphorylation was correlated with cancer patient prognosis and enriched in tumours. Thus, our results revealed a novel role of BCL9 in controlling mitotic Wnt signalling to promote cell division and growth.
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