9KCV

Structure of the Medicago truncatula CNGC15b with CAM

Summary for 9KCV

• Entry DOI: 10.2210/pdb9kcv/pdb
• EMDB information: 62262
• Descriptor: Protein CNGC15b,Calmodulin 2 (1 entity in total)
• Functional Keywords: channel, membrane protein
• Biological source: Medicago truncatula (barrel medic); More
• Total number of polymer chains: 4
• Total formula weight: 363256.75

Authors

Yang, G.H.,Xu, X.,Yang, J.Z. (deposition date: 2024-11-02, release date: 2025-08-13)

Primary citation

Xu, X.,Wang, Q.,Sun, T.,Gao, H.,Gu, R.,Yang, J.,Zhou, J.,Fu, P.,Wen, H.,Yang, G.
Structural basis for the activity regulation of Medicago calcium channel CNGC15.
Cell Discov, 11:63-63, 2025

PubMed Abstract: Cyclic nucleotide-gated ion channels (CNGCs) in plants mediate Ca influx in response to environmental changes. Among numerous plant CNGCs, Medicago truncatula CNGC15a/b/c (MtCNGC15) is localized to the nuclear envelope. The opening and closing cycle of MtCNGC15 is tightly associated with the Ca oscillation in symbiosis. However, the molecular mechanism underlying MtCNGC15 activity regulation remains unclear. In this study, we present the structures of MtCNGC15 in its apo form and in the presence of CaM. The apo MtCNGC15b exhibits a flexible cytoplasmic domain (CPD), whereas binding of the MtCaM inhibits Ca currents and stabilizes the highly dynamic CPD. Furthermore, the activity of MtCNGC15b seems to be independent of cGMP. The hypothetical binding pocket for cGMP is occupied by an arginine residue. These findings elucidate the structural basis for the activity regulation of nuclear localized MtCNGC15.

PubMed: 40695816
DOI: 10.1038/s41421-025-00815-y

Experimental method

ELECTRON MICROSCOPY (3.6 Å)