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 

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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:  
    5NWI, 5NWJ, 5NWK

  • 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 + Arabidopsis thaliana 1) channel is regulated by 14-3-3 proteins and further modulated by the phytotoxin fusicoccin, in analogy to the H + -ATPase ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
14-3-3 c-1 proteinA, C [auth B], E [auth C], G [auth D], I [auth E], K [auth F], M [auth G], O [auth H]262Nicotiana tabacumMutation(s): 0 
Gene Names: 14-3-3 c-1LOC107777576Nt14-3-3omega2
UniProt
Find proteins for P93343 (Nicotiana tabacum)
Explore P93343 
Go to UniProtKB:  P93343
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium channel KAT1B [auth P], D [auth Q], F [auth R], H [auth S], J [auth T], L [auth U], N [auth V], P [auth W]5Arabidopsis thalianaMutation(s): 0 
Gene Names: KAT1At5g46240MPL12.2
UniProt
Find proteins for Q39128 (Arabidopsis thaliana)
Explore Q39128 
Go to UniProtKB:  Q39128
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
B [auth P], D [auth Q], F [auth R], H [auth S], J [auth T], L [auth U], N [auth V], P [auth W]L-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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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

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