5NWK

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.231 

wwPDB Validation 3D Report Full Report



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
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • 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

    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

    Institute for Biophysics-Milan, Consiglio Nazionale delle Ricerche, 20133 Milan, Italy.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
14-3-3 c-1 proteinA, B, C, D, E, F, G, H262Nicotiana tabacumMutation(s): 0 
Gene Names: 14-3-3 c-1LOC107777576Nt14-3-3omega2
Find proteins for P93343 (Nicotiana tabacum)
Explore P93343 
Go to UniProtKB:  P93343
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by: Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Potassium channel KAT1P, Q, R, S, T, U, V, W5Arabidopsis thalianaMutation(s): 0 
Gene Names: KAT1At5g46240MPL12.2
Find proteins for Q39128 (Arabidopsis thaliana)
Explore Q39128 
Go to UniProtKB:  Q39128
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FSC
Query on FSC

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

Download CCD File 
W
PHOSPHOSERINE
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,WL-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.231 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.806α = 90
b = 165.661β = 90
c = 170.552γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

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