- PDB-8bw8: Crystal structure of the dCNK-SAM-CRIC-PDZ/dHYP-SAM complex -
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Basic information
Entry
Database: PDB / ID: 8bw8
Title
Crystal structure of the dCNK-SAM-CRIC-PDZ/dHYP-SAM complex
Components
Connector enhancer of KSR protein CNK
Protein aveugle
Keywords
SIGNALING PROTEIN / Scaffolding protein / Connector enhancer of KSR (CNK) / Protein Aveugle (AVE) / Hyphen protein (HYP) / COmplex protein / Sterile alpha motif (SAM) domain / conserved region in CNK (CRIC) domain / PSD-95 / Dlg / and Zo-1. (PDZ) domain.
Function / homology
Function and homology information
terminal region determination / Phosphorylation of CI / compound eye cone cell differentiation / Phosphorylation of SMO / torso signaling pathway / tracheal outgrowth, open tracheal system / compound eye photoreceptor cell differentiation / sevenless signaling pathway / Phosphorylation of PER and TIM / MAP2K and MAPK activation ...terminal region determination / Phosphorylation of CI / compound eye cone cell differentiation / Phosphorylation of SMO / torso signaling pathway / tracheal outgrowth, open tracheal system / compound eye photoreceptor cell differentiation / sevenless signaling pathway / Phosphorylation of PER and TIM / MAP2K and MAPK activation / eye photoreceptor cell differentiation / epithelial cell migration, open tracheal system / imaginal disc-derived wing vein specification / MAP-kinase scaffold activity / mitogen-activated protein kinase kinase kinase binding / positive regulation of Ras protein signal transduction / fibroblast growth factor receptor signaling pathway / enzyme regulator activity / cell surface receptor protein tyrosine kinase signaling pathway / visual perception / epidermal growth factor receptor signaling pathway / cytoplasmic side of plasma membrane / receptor tyrosine kinase binding / apical part of cell / insulin receptor signaling pathway / cell cortex / scaffold protein binding / defense response to virus / positive regulation of ERK1 and ERK2 cascade / cytoplasm / cytosol Similarity search - Function
Aveugle-like, SAM domain / : / CRIC domain / Connector enhancer of kinase suppressor of ras / CRIC domain profile. / SAM domain (Sterile alpha motif) / SAM domain (Sterile alpha motif) / SAM domain profile. / Sterile alpha motif. / Sterile alpha motif domain ...Aveugle-like, SAM domain / : / CRIC domain / Connector enhancer of kinase suppressor of ras / CRIC domain profile. / SAM domain (Sterile alpha motif) / SAM domain (Sterile alpha motif) / SAM domain profile. / Sterile alpha motif. / Sterile alpha motif domain / PH domain / Sterile alpha motif/pointed domain superfamily / PH domain profile. / PDZ domain / Pleckstrin homology domain. / Pleckstrin homology domain / PDZ domain profile. / Domain present in PSD-95, Dlg, and ZO-1/2. / PDZ domain / PDZ superfamily / PH-like domain superfamily Similarity search - Domain/homology
Journal: Nat Struct Mol Biol / Year: 2024 Title: The CNK-HYP scaffolding complex promotes RAF activation by enhancing KSR-MEK interaction. Authors: Pierre Maisonneuve / Malha Sahmi / Fanny Bergeron-Labrecque / Xianjie Iris Ma / Juliette Queguiner / Geneviève Arseneault / Martin Lefrançois / Igor Kurinov / Rémi Fronzes / Frank Sicheri / Marc Therrien / Abstract: The RAS-MAPK pathway regulates cell proliferation, differentiation and survival, and its dysregulation is associated with cancer development. The pathway minimally comprises the small GTPase RAS and ...The RAS-MAPK pathway regulates cell proliferation, differentiation and survival, and its dysregulation is associated with cancer development. The pathway minimally comprises the small GTPase RAS and the kinases RAF, MEK and ERK. Activation of RAF by RAS is notoriously intricate and remains only partially understood. There are three RAF isoforms in mammals (ARAF, BRAF and CRAF) and two related pseudokinases (KSR1 and KSR2). RAS-mediated activation of RAF depends on an allosteric mechanism driven by the dimerization of its kinase domain. Recent work on human RAFs showed that MEK binding to KSR1 promotes KSR1-BRAF heterodimerization, which leads to the phosphorylation of free MEK molecules by BRAF. Similar findings were made with the single Drosophila RAF homolog. Here we show that the fly scaffold proteins CNK and HYP stabilize the KSR-MEK interaction, which in turn enhances RAF-KSR heterodimerization and RAF activation. The cryogenic electron microscopy structure of the minimal KSR-MEK-CNK-HYP complex reveals a ring-like arrangement of the CNK-HYP complex allowing CNK to simultaneously engage KSR and MEK, thus stabilizing the binary interaction. Together, these results illuminate how CNK contributes to RAF activation by stimulating the allosteric function of KSR and highlight the diversity of mechanisms impacting RAF dimerization as well as the regulatory potential of the KSR-MEK interaction.
A: Protein aveugle B: Connector enhancer of KSR protein CNK C: Protein aveugle D: Connector enhancer of KSR protein CNK E: Protein aveugle F: Connector enhancer of KSR protein CNK hetero molecules