5nwk

14-3-3c in complex with CPP and fusicoccin

spinqualitylabelsall models 5nwk, resolution 3.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5nwk is a 16 chain structure with sequence from Arabidopsis thaliana and Nicotiana tabacum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.3Å Ligands: FSC, SEP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function 1433C_TOBAC Publication Abstract from PubMed Plants acquire potassium (K+) ions for cell growth and movement via regulated diffusion through K+ channels. Here, we present crystallographic and functional data showing that the K+ inward rectifier KAT1 (K+Arabidopsis thaliana 1) channel is regulated by 14-3-3 proteins and further modulated by the phytotoxin fusicoccin, in analogy to the H+-ATPase. We identified a 14-3-3 mode III binding site at the very C terminus of KAT1 and cocrystallized it with tobacco (Nicotiana tabacum) 14-3-3 proteins to describe the protein complex at atomic detail. Validation of this interaction by electrophysiology shows that 14-3-3 binding augments KAT1 conductance by increasing the maximal current and by positively shifting the voltage dependency of gating. Fusicoccin potentiates the 14-3-3 effect on KAT1 activity by stabilizing their interaction. Crystal structure of the ternary complex reveals a noncanonical binding site for the toxin that adopts a novel conformation. The structural insights underscore the adaptability of fusicoccin, predicting more potential targets than so far anticipated. The data further advocate a common mechanism of regulation of the proton pump and a potassium channel, two essential elements in K+ uptake in plant cells. Fusicoccin Activates KAT1 Channels by Stabilizing Their Interaction with 14-3-3 Proteins.,Saponaro A, Porro A, Chaves-Sanjuan A, Nardini M, Rauh O, Thiel G, Moroni A Plant Cell. 2017 Oct;29(10):2570-2580. doi: 10.1105/tpc.17.00375. Epub 2017 Sep, 29. PMID:28970335 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also 14-3-3 protein 3D structures

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