Journal
EMBO JOURNAL
Volume 29, Issue 22, Pages 3750-3761Publisher
WILEY
DOI: 10.1038/emboj.2010.251
Keywords
Han11; HIPK2; MAP kinase; MEKK1; scaffold protein
Categories
Funding
- Deutscher akademischer Austauschdienst [A/08/98404]
- Deutsche Forschungsgemeinschaft [SCHM 1417/4-2, SCHM 1417/7-1, SCHM 1417/8-1, GRK 1566/1, SFB/TRR 81]
- Excellence Cluster Cardio-Pulmonary System (ECCPS)
- LOEWE/UGMLC program
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Protein kinases are organized in hierarchical networks that are assembled and regulated by scaffold proteins. Here, we identify the evolutionary conserved WD40-repeat protein Han11 as an interactor of the kinase homeodomain- interacting protein kinase 2 (HIPK2). In vitro experiments showed the direct binding of Han11 to HIPK2, but also to the kinases DYRK1a, DYRK1b and mitogen-activated protein kinase kinase kinase 1 (MEKK1). Han11 was required to allow coupling of MEKK1 to DYRK1 and HIPK2. Knockdown experiments in Caenorhabditis elegans showed the relevance of the Han11 orthologs Swan-1 and Swan-2 for the osmotic stress response. Downregulation of Han11 in human cells lowered the threshold and amplitude of HIPK2- and MEKK1-triggered signalling events and changed the kinetics of kinase induction. Han11 knockdown changed the amplitude and time dependence of HIPK2-driven transcription in response to DNA damage and also interfered with MEKK1-triggered gene expression and stress signalling. Impaired signal transmission also occurred upon interference with stoichiometrically assembled signalling complexes by Han11 overexpression. Collectively, these experiments identify Han11 as a novel scaffold protein regulating kinase signalling by HIPK2 and MEKK1.
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