6QK8

Crystal structure of yeast 14-3-3 protein (Bmh1) from Saccharomyces cerevisiae with the Nha1p (yeast Na+/H+ antiporter) 14-3-3 binding motif Ser481


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.92 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.220 

wwPDB Validation   3D Report Full Report



Literature

The activity of Saccharomyces cerevisiae Na+, K+/H+antiporter Nha1 is negatively regulated by 14-3-3 protein binding at serine 481.

Smidova, A.Stankova, K.Petrvalska, O.Lazar, J.Sychrova, H.Obsil, T.Zimmermannova, O.Obsilova, V.

(2019) Biochim Biophys Acta Mol Cell Res 1866: 118534-118534

  • DOI: 10.1016/j.bbamcr.2019.118534
  • Primary Citation of Related Structures:  
    6QK8

  • PubMed Abstract: 
  • Na + /H + antiporters are involved in ensuring optimal intracellular concentrations of alkali-metal cations and protons in most organisms. In Saccharomyces cerevisiae, the plasma-membrane Na + , K + /H + ...

    Na + /H + antiporters are involved in ensuring optimal intracellular concentrations of alkali-metal cations and protons in most organisms. In Saccharomyces cerevisiae, the plasma-membrane Na + , K + /H + antiporter Nha1 mediates Na + and K + efflux, which is important for cell growth in the presence of salts. Nha1 belongs among housekeeping proteins and, due to its ability to export K + , it has many physiological functions. The Nha1 transport activity is regulated through its long, hydrophilic and unstructured C-terminus (554 of 985 aa). Although Nha1 has been previously shown to interact with the yeast 14-3-3 isoform (Bmh2), the binding site remains unknown. In this work, we identified the residues through which Nha1 interacts with the 14-3-3 protein. Biophysical characterization of the interaction between the C-terminal polypeptide of Nha1 and Bmh proteins in vitro revealed that the 14-3-3 protein binds to phosphorylated Ser481 of Nha1, and the crystal structure of the phosphopeptide containing Ser481 bound to Bmh1 provided the structural basis of this interaction. Our data indicate that 14-3-3 binding induces a disorder-to-order transition of the C-terminus of Nha1, and in vivo experiments showed that the mutation of Ser481 to Ala significantly increases cation efflux activity via Nha1, which renders cells sensitive to low K + concentrations. Hence, 14-3-3 binding is apparently essential for the negative regulation of Nha1 activity, which should be low under standard growth conditions, when low amounts of toxic salts are present and yeast cells need to accumulate high amounts of K + .


    Organizational Affiliation

    Department of Structural Biology of Signaling Proteins, Division BIOCEV, Institute of Physiology of the Czech Academy of Sciences, 252 50 Vestec, Czech Republic. Electronic address: veronika.obsilova@fgu.cas.cz.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein BMH1 ABCD236Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: BMH1YER177W
Find proteins for P29311 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P29311 
Go to UniProtKB:  P29311
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Na(+)/H(+) antiporter EFGH8Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: NHA1YLR138WL3149L9606.4
Find proteins for Q99271 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q99271 
Go to UniProtKB:  Q99271
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
E,F,G,HL-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.92 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.220 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.85α = 95.9
b = 59.112β = 104.14
c = 66.7γ = 91.19
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Grant Agency of the Czech RepublicCzech Republic17-01953S

Revision History 

  • Version 1.0: 2019-10-02
    Type: Initial release