5NWK

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

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.

(2017) Plant Cell 29: 2570-2580

  • DOI: 10.1105/tpc.17.00375
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Plants acquire potassium (K <sup>+ </sup>) ions for cell growth and movement via regulated diffusion through K <sup>+ </sup> channels. Here, we present crystallographic and functional data showing that the K <sup>+ </sup> inward rectifier KAT1 (K <su ...

    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.


    Organizational Affiliation

    Department of Biosciences, University of Milan, 20133 Milan, Italy.,Plant Membrane Biophysics, Technical University Darmstadt, 64287 Darmstadt, Germany.,Institute for Biophysics-Milan, Consiglio Nazionale delle Ricerche, 20133 Milan, Italy.,Department of Biosciences, University of Milan, 20133 Milan, Italy anna.moroni@unimi.it.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
14-3-3 c-1 protein
A, B, C, D, E, F, G, H
262Nicotiana tabacumMutation(s): 0 
Find proteins for P93343 (Nicotiana tabacum)
Go to UniProtKB:  P93343
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Potassium channel KAT1
P, Q, R, S, T, U, V, W
5N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FSC
Query on FSC

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G
FUSICOCCIN
C36 H56 O12
KXTYBXCEQOANSX-WYKQKOHHSA-N
 Ligand Interaction
SEP
Query on SEP

Download SDF File 
Download CCD File 
W
PHOSPHOSERINE
PHOSPHONOSERINE
C3 H8 N O6 P
BZQFBWGGLXLEPQ-REOHCLBHSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
P, Q, R, S, T, U, V, W
L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.229 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 99.806α = 90.00
b = 165.661β = 90.00
c = 170.552γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
PHASERphasing
XDSdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-11-22
    Type: Initial release