9K1L

Complex structure of CNK2 and SAMD12

Summary for 9K1L

• Entry DOI: 10.2210/pdb9k1l/pdb
• Descriptor: Connector enhancer of kinase suppressor of ras 2, Sterile alpha motif domain-containing protein 12, GLYCEROL, ... (4 entities in total)
• Functional Keywords: neurodevelopmental disorders, synapse formation, structural protein
• Biological source: Mus musculus (house mouse); More
• Total number of polymer chains: 2
• Total formula weight: 46935.62

Authors

Lin, Z.,Chen, K.,Zhang, M. (deposition date: 2024-10-16, release date: 2025-03-12, Last modification date: 2025-03-19)

Primary citation

Pan, W.,Lin, Z.,Chen, S.,Li, J.,Wang, Y.,Chen, K.,Zhang, M.
SAMD12 as a Master Regulator of MAP4Ks by Decoupling Kinases From the CNKSR2 Scaffold.
J.Mol.Biol., 437:169034-169034, 2025

PubMed Abstract: The MAP4K member TNIK and the multi-domain scaffold protein CNKSR2, both of which are clustered at neuronal synapses, interact with each other and are closely associated with neurodevelopmental disorders, although the mechanism underlying their interaction is unclear. In this study, we characterized the interaction mechanisms between MAP4K kinases (MAP4K4, MINK1 and TNIK) and the CNKSR1/2/3 scaffold proteins, and discovered that SAMD12, a familial adult myoclonic epilepsy disease gene product, or its close homolog SAMD10, binds to CNKSR1/2/3 with exceptionally strong affinities and can quantitatively displace MAP4K from CNKSR1/2/3 scaffolds. Additionally, we demonstrated that CNKSR2 acts as both a scaffold and an activator of TNIK during neuronal synapse development. Ectopic expression of SAMD12 can effectively alter synapse development, likely by inhibiting TNIK activity through the dissociation of the kinase from CNKSR2. Our findings may have broad implications on the roles of MAP4Ks and CNKSR1/2/3 in the nervous system and in other tissues under physiological and pathophysiological processes.

PubMed: 40010432
DOI: 10.1016/j.jmb.2025.169034

Experimental method

X-RAY DIFFRACTION (2.85 Å)