KimA from Bacillus subtilis in inward-facing, occluded state

Experimental Data Snapshot

  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Structural basis of proton-coupled potassium transport in the KUP family.

Tascon, I.Sousa, J.S.Corey, R.A.Mills, D.J.Griwatz, D.Aumuller, N.Mikusevic, V.Stansfeld, P.J.Vonck, J.Hanelt, I.

(2020) Nat Commun 11: 626-626

  • DOI: https://doi.org/10.1038/s41467-020-14441-7
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Potassium homeostasis is vital for all organisms, but is challenging in single-celled organisms like bacteria and yeast and immobile organisms like plants that constantly need to adapt to changing external conditions. KUP transporters facilitate potassium uptake by the co-transport of protons. Here, we uncover the molecular basis for transport in this widely distributed family. We identify the potassium importer KimA from Bacillus subtilis as a member of the KUP family, demonstrate that it functions as a K + /H + symporter and report a 3.7 Å cryo-EM structure of the KimA homodimer in an inward-occluded, trans-inhibited conformation. By introducing point mutations, we identify key residues for potassium and proton binding, which are conserved among other KUP proteins.

  • Organizational Affiliation

    Institute of Biochemistry, Goethe University Frankfurt, Frankfurt am Main, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
APC family permeaseA [auth B],
B [auth A]
607Bacillus subtilisMutation(s): 0 
Gene Names: B4417_2855ETK71_02405
Membrane Entity: Yes 
Find proteins for P96589 (Bacillus subtilis (strain 168))
Explore P96589 
Go to UniProtKB:  P96589
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP96589
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-12
    Type: Initial release