Journal
BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS
Volume 1866, Issue 12, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.bbagen.2022.130238
Keywords
Hippo; MST2; Breast cells; SCF beta TrCP; Extracellular matrix stiffness; Ubiquitinproteasome system
Categories
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [14/10492-0]
- FAPESP [2019/26767-2, 14/25832-1, 17/18641-3, 17/18067-5, 2017/25437-3, 2018/00629-0]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [444597/2014-0]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]
- National Institute of Health [R01-CA76584, R35GM136250, R35-GM127089]
- CAPES PhD-scholarship (PROEX)
- CNPq [14668/2019-9]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [17/18067-5, 17/18641-3, 14/25832-1, 14/10492-0] Funding Source: FAPESP
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This study uncovers the biochemical mechanisms controlling MST2 degradation and highlights the regulation of proteostasis of a central Hippo pathway component by alterations in the microenvironment rigidity.
The Hippo pathway plays central roles in relaying mechanical signals during development and tumorigenesis, but how the proteostasis of the Hippo kinase MST2 is regulated remains unknown. Here, we found that chemical inhibition of proteasomal proteolysis resulted in increased levels of MST2 in human breast epithelial cells. MST2 binds SCF beta TrCP E3 ubiquitin ligase and silencing beta TrCP resulted in MST2 accumulation. Site-directed mutagenesis combined with computational molecular dynamics studies revealed that beta TrCP binds MST2 via a non-canonical degradation motif. Additionally, stiffer extracellular matrix, as well as hyperactivation of integrins resulted in enhanced MST2 degradation mediated by integrin-linked kinase (ILK) and actomyosin stress fibers. Our study uncovers the underlying biochemical mechanisms controlling MST2 degradation and underscores how alterations in the microenvironment rigidity regulate the proteostasis of a central Hippo pathway component.
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